CN114520089A - Common mode filter and terminal equipment - Google Patents
Common mode filter and terminal equipment Download PDFInfo
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Abstract
The application relates to a common mode filter and terminal equipment. The common mode filter includes: the first coil group, the second coil group and the third coil group are mutually parallel and are a first magnetic layer, a first coil layer, one or more middle coil layers, a second coil layer and a second magnetic layer which are sequentially arranged; the first coil group comprises a first wire in each coil layer; the second coil group comprises a second wire in each coil layer; the third coil group comprises a third trace in each coil layer; the wires of each coil group are connected together through the wire through holes, and at least two wires of the wires in the same coil layer are wound in parallel. According to the common mode filter and the terminal device provided by the embodiment of the application, distances between all coil groups of the common mode filter and the first magnetic layer and distances between all coil groups of the common mode filter and the second magnetic layer are respectively kept consistent under the same phase, so that the symmetry among different coil groups is improved, and the longitudinal transfer loss of the common mode filter is reduced.
Description
Technical Field
The application relates to the technical field of electronics, in particular to a common-mode filter and terminal equipment.
Background
With the size and thickness of terminal products such as Mobile phones, smart tablets, and portable computers becoming smaller and thinner, the spatial distance between the radio frequency antenna and the high-speed data transmission Interface (such as Mobile Industry Processor Interface (MIPI) alliance, servers (SERializer)/DESerializer (DESerializer) Interface, Embedded digital audio/video transmission Interface (eDP) and the like) used by multimedia systems such as cameras (cameras), displays (displays) and the like becomes smaller and smaller, the coupling between the radio frequency antenna and the multimedia system becomes stronger, so that the radio frequency system is interfered more and more by the MIPI high-speed data transmission mode, and the radio frequency transmission power is more easily influenced, which becomes a key factor for influencing the electromagnetic compatibility between the radio frequency and the multimedia system on the terminal products such as Mobile phones and the like. In order to solve the coexistence problem of radio frequency and high-speed differential data transmission modules such as MIPI, Serdes, eDP and the like, a common mode filter with high common mode rejection degree, low longitudinal transfer loss and good symmetry is required, so as to solve the problems that the common mode filter in the related art has poor symmetry and is easy to convert common mode noise into differential mode noise so as to reduce the filtering effect of the common mode filter on the common mode interference noise.
Disclosure of Invention
In view of this, a common mode filter and a terminal device with high symmetry and low longitudinal transfer loss are provided.
In a first aspect, an embodiment of the present application provides a common-mode filter, including: the coil comprises a plurality of coil groups, a plurality of routing through holes, and a first magnetic layer, a second magnetic layer and a plurality of coil layers which are parallel to each other, wherein the plurality of coil groups at least comprise a first coil group, a second coil group and a third coil group, the plurality of routing through holes at least comprise a first routing through hole, a second routing through hole and a third routing through hole, the plurality of coil layers comprise a first coil layer, at least one middle coil layer and a second coil layer, each coil layer is at least provided with a first routing, a second routing and a third routing, and the first coil layer, the middle coil layer and the second coil layer are sequentially stacked between the first magnetic layer and the second magnetic layer; the first coil group comprises a first trace in each coil layer, the second coil group comprises a second trace in each coil layer, and the third coil group comprises a third trace in each coil layer; the first routing via hole is used for connecting a plurality of first routing wires of the first coil group together, the second routing via hole is used for connecting a plurality of second routing wires of the second coil group together, and the third routing via hole is used for connecting a plurality of third routing wires of the third coil group together; at least two of the first wire, the second wire and the third wire in the same coil layer are wound in parallel. The distances between all the coil groups and the first magnetic layer and between all the coil groups and the second magnetic layer are kept consistent under the same phase, so that the symmetry among different coil groups is improved, and the longitudinal transfer loss of the common mode filter is reduced.
In a second aspect, an embodiment of the present application provides a common mode filter, including: the coil comprises a plurality of coil groups, a plurality of routing through holes, and a first magnetic layer, a second magnetic layer and a plurality of coil layers which are parallel to each other, wherein the plurality of coil groups at least comprise a first coil group, a second coil group and a third coil group, the plurality of routing through holes at least comprise a first routing through hole, a second routing through hole and a third routing through hole, the plurality of coil layers comprise a first coil layer, at least one middle coil layer and a second coil layer, each coil layer is at least provided with a first routing, a second routing and a third routing, and the first coil layer, the middle coil layer and the second coil layer are sequentially arranged between the first magnetic layer and the second magnetic layer; the first coil group comprises a first trace in each coil layer, the second coil group comprises a second trace in each coil layer, and the third coil group comprises a third trace in each coil layer; the first trace via hole is used for connecting a plurality of first traces of the first coil group together, the second trace via hole is used for connecting a plurality of second traces of the second coil group together, and the third trace via hole is used for connecting a plurality of third traces of the third coil group together; at least two of the first wire, the second wire and the third wire in the same coil layer are wound in parallel, and the width of the wire in the same coil group meets any one of the following conditions: the width of the first wire and the width of the second wire are both the width of the first wire, the width of the third wire is the width of the second wire, and the width of the first wire is different from the width of the second wire; or the width of the first trace, the width of the second trace and the width of the third trace are different, where the width of the first trace is the width of the first trace, and the width of the second trace is the width of the second trace. Wherein the first trace width and the second trace width satisfy: w1 is p1 xW 2, W1 is the first trace width, W2 is the second trace width, and p1 is a proportionality coefficient, wherein p1 epsilon [0.5,0.8] or p1 epsilon [2,3 ].
Through the arrangement, the distances between all the coil groups and the first magnetic layer and the distances between all the coil groups and the second magnetic layer are respectively kept consistent under the same phase, so that the symmetry among different coil groups is improved, and the longitudinal transfer loss of the common mode filter is reduced. Moreover, because the wiring width of each coil group is set according to the preset width proportional relationship, the impedance difference caused by different length sums of a plurality of wirings in different coil groups, different thicknesses of the wirings in different coil groups due to processing technology, phase inconsistency between the wirings of different coil groups due to the position arrangement of the wiring through holes and the like can be further improved, the wiring width of different coil groups can be adjusted by adjusting the width proportional relationship, so that different coil groups have similar or identical characteristic impedance, the symmetry between different coil groups is improved, and the longitudinal transfer loss of the common mode filter is reduced.
In a first possible implementation form of the common-mode filter according to the first or second aspect, the first wire, the second wire and the third wire in the first coil layer have a first relative position relationship, the first wire, the second wire and the third wire in the second coil layer have a second relative position relationship, the first routing wire, the second routing wire and the third routing wire in the middle coil layer have middle relative position relation, wherein the first relative positional relationship, the second relative positional relationship, and the intermediate relative positional relationship are the same, and the center lines of the first routing via hole, the second routing via hole and the third routing via hole for realizing the first routing connection, the second routing via hole and the third routing connection in the adjacent coil layers are all positioned on the same cross section perpendicular to each coil layer. Enabling the distances between all the coil groups and the first magnetic layer and the second magnetic layer to be consistent under the same phase; in each coil layer, the relative position relationship between the wires of different coil groups is the same, so that the symmetry between different coil groups can be further improved, and the longitudinal transfer loss of the common mode filter can be reduced.
According to the first aspect or the second aspect, in a second possible implementation manner of the common mode filter, a first relative positional relationship exists among a first trace, a second trace, and a third trace in the first coil layer, a second relative positional relationship exists among the first trace, the second trace, and the third trace in the second coil layer, and a middle relative positional relationship exists among the first trace, the second trace, and the third trace in the middle coil layer, where the first relative positional relationship, the second relative positional relationship, and the middle relative positional relationship are not consistent, and a first total length of a plurality of first traces of the first coil group, a second total length of a plurality of second traces of the second coil group, and a third total length of a plurality of third traces of the third coil group are the same. Enabling the distances between all the coil groups and the first magnetic layer and the second magnetic layer to be consistent under the same phase; and the total sum of the lengths of the windings among different coil groups is the same by changing the relative position relationship among the wires of different coil groups in each coil layer, thereby further improving the symmetry among different coil groups and reducing the longitudinal transfer loss of the common mode filter.
According to the first aspect or the second aspect, in a third possible implementation manner of the common mode filter, a first relative positional relationship exists among a first trace, a second trace, and a third trace in the first coil layer, a second relative positional relationship exists among the first trace, the second trace, and the third trace in the second coil layer, and a middle relative positional relationship exists among the first trace, the second trace, and the third trace in the middle coil layer, where the first relative positional relationship, the second relative positional relationship, and the middle relative positional relationship are the same, and a sum of first lengths of a plurality of first traces of the first coil group, a sum of second lengths of a plurality of second traces of the second coil group, and a sum of third lengths of a plurality of third traces of the third coil group are the same. The distances between all the coil groups and the first magnetic layer and the distances between all the coil groups and the second magnetic layer are kept consistent in the same phase, and on the premise that the relative position relationship between the wires of different coil groups in each coil layer is kept the same, the total length of the wires among the different coil groups is the same by changing the lengths of the wires in the different coil layers, so that the symmetry among the different coil groups is further improved, and the longitudinal transfer loss of the common mode filter is reduced.
According to the first aspect, the second aspect, the first possible implementation manner, the second possible implementation manner, or the third possible implementation manner, in a fourth possible implementation manner of the common mode filter, the common mode filter further includes a ground reference structure, the ground reference structure is insulated from each first trace, each second trace, and each third trace, and the ground reference structure is insulated from the first magnetic layer and the second magnetic layer. By means of the arrangement of the structure of the reference ground,
in a fifth possible implementation form of the common-mode filter according to the fourth possible implementation form, the ground reference structure comprises a first auxiliary layer and a second auxiliary layer,
the first auxiliary layer is positioned between the first coil layer and the first magnetic layer, and first reference ground wires corresponding to a first wire, a second wire and a third wire in the first coil layer are arranged in the first auxiliary layer;
the second auxiliary layer is located between the second coil layer and the second magnetic layer, and second reference ground wires corresponding to the first wire, the second wire and the third wire in the second coil layer are arranged in the second auxiliary layer. Enabling the distances between all the coil groups and the first magnetic layer and the second magnetic layer to be consistent under the same phase; and the first auxiliary layer and the second auxiliary layer with the reference ground wires are arranged, so that the different coil groups have similar ground impedance, the symmetry among the different coil groups is further improved, and the longitudinal transfer loss of the common mode filter is reduced.
According to a fourth possible implementation manner, in a sixth possible implementation manner of the common-mode filter, the ground reference structure includes: the first coil layer is provided with a first accompanying reference ground wire of one or more first target wires of a first wire, a second wire and a third wire of the first coil layer, and the first accompanying reference ground wire is positioned at one side or two sides of the first target wire;
the middle coil layer is provided with a middle accompanying reference ground wire of one or more middle target wires in the first wire, the second wire and the third wire of the middle coil layer, and the middle accompanying reference ground wire is positioned at one side or two sides of the middle target wires;
the second coil layer is provided with a second accompanying reference ground wire of one or more second target wires of the first wire, the second wire and the third wire of the second coil layer, and the second accompanying reference ground wire is positioned on one side or two sides of the second target wires. The distances between all the coil groups and the first magnetic layer and the distances between all the coil groups and the second magnetic layer are kept consistent under the same phase, and the accompanying ground wire is arranged, so that different coil groups have similar ground impedance, the symmetry among the different coil groups is further improved, and the longitudinal transfer loss of the common mode filter is reduced.
According to a sixth possible implementation form, in a seventh possible implementation form of the common-mode filter, the first companion reference ground line, the intermediate companion reference ground line and the second companion reference ground line are connected together. In this way, it is further ensured that different coil groups have similar impedance to ground compared to the fourth possible implementation.
According to four possible implementations, in an eighth possible implementation of the common mode filter, the ground reference structure comprises at least one of the following metal reference ground layers:
a first metal reference ground layer between the first coil layer and the first magnetic layer;
a second metal reference ground layer between the second coil layer and the second magnetic layer;
the third metal reference stratum is positioned between the first coil layer and the middle coil layer and is provided with a first containing hole for containing a first routing through hole, a second routing through hole and a third routing through hole which pass through the third metal reference stratum;
the fourth metal reference stratum is positioned between the second coil layer and the middle coil layer and is provided with a first routing through hole, a second routing through hole and a second containing hole for containing the third routing through hole which pass through the third metal reference stratum;
the middle metal reference stratum comprises one or more middle metal reference stratums, each middle metal reference stratum is located between two middle coil layers and is provided with a first routing through hole, a second routing through hole and a third containing hole, and the first routing through hole, the second routing through hole and the third routing through hole are contained in the third metal reference stratum. The distances between all the coil groups and the first magnetic layer and the distance between all the coil groups and the second magnetic layer are kept consistent under the same phase, and compared with a common mode filter arranged in other possible implementation modes, the common mode filter is provided with a metal reference ground layer, so that different coil groups have close ground impedance, the symmetry among different coil groups is further improved, and the longitudinal transfer loss of the common mode filter is reduced.
According to an eighth possible implementation manner, in a ninth possible implementation manner of the common mode filter, when the metal reference ground layer is multiple, multiple metal reference ground layers are connected together through a ground reference via hole, and the ground reference via hole is disposed in one or more of the first coil layer, the second coil layer, and the intermediate coil layer. And compared with the sixth possible implementation mode, the difference of the impedance to the ground between different coil groups can be further reduced by arranging the reference ground via hole.
In a tenth possible implementation manner of the common mode filter according to the first aspect, the second aspect or any one of the nine possible implementation manners, the common mode filter further includes a third magnetic layer and a fourth magnetic layer that are parallel to each other, the first coil layer, the intermediate coil layer and the second coil layer are located between the third magnetic layer and the fourth magnetic layer, the third magnetic layer is perpendicular to the first magnetic layer and the second magnetic layer, respectively, and the fourth magnetic layer is perpendicular to the first magnetic layer and the second magnetic layer, respectively. The distances between all the coil groups and the first magnetic layer, the distances between all the coil groups and the second magnetic layer, the third magnetic layer and the fourth magnetic layer are respectively kept consistent, and compared with a common-mode filter which is arranged only by the first magnetic layer and the second magnetic layer, the coil groups can be in the same magnetic environment in two dimensions, the symmetry among different coil groups is further improved, and the longitudinal transfer loss of the common-mode filter is reduced.
In an eleventh possible implementation manner of the common mode filter according to the tenth possible implementation manner, the common mode filter further includes a fifth magnetic layer and a sixth magnetic layer that are parallel to each other,
the first coil layer, the middle coil layer and the second coil layer are located between the fifth magnetic layer and the sixth magnetic layer, the fifth magnetic layer is perpendicular to the first magnetic layer, the second magnetic layer, the third magnetic layer and the fourth magnetic layer respectively, and the sixth magnetic layer is perpendicular to the first magnetic layer, the second magnetic layer, the third magnetic layer and the fourth magnetic layer respectively. The distances between all coil groups and the first magnetic layer, the second magnetic layer, the third magnetic layer, the fourth magnetic layer, the fifth magnetic layer and the sixth magnetic layer are respectively kept consistent under the same phase, and compared with a mode of only comprising the first magnetic layer and the second magnetic layer, the common mode filter is arranged in a mode of only comprising the first magnetic layer, the second magnetic layer, the third magnetic layer and the fourth magnetic layer, so that the plurality of coil groups can be in the same magnetic environment in a three-dimensional space, the symmetry among different coil groups is further improved, and the longitudinal transfer loss of the common mode filter is reduced.
According to a twelfth possible implementation manner, in a twelfth possible implementation manner of the common-mode filter, the ground reference structure includes a metal ground reference cladding layer, and the metal ground reference cladding layer is cladded on the surface of the common-mode filter. The distances between all the coil groups and the magnetic layer are kept consistent under the same phase, and compared with the common mode filter arranged in the mode of the first aspect, the coil groups can be in the same reference ground environment in a three-dimensional space and have consistent ground impedance, the symmetry among different coil groups is further improved, and the longitudinal transfer loss of the common mode filter is reduced.
According to a fourth possible implementation manner, in a thirteenth possible implementation manner of the common mode filter, the ground reference structure further includes pads and a metal ground reference strip respectively connected to the terminals of each coil group, a part of each pad is located on a first side of the common mode filter, and another part of each pad is located on one of a plurality of second sides of the common mode filter connected to the first side; the metal reference ground strip is positioned between the pads and surrounds at least partial areas of the first side and the second side with the pads of the common mode filter. The distances between all the coil groups and the magnetic layer are kept consistent under the same phase, and compared with the common mode filter arranged in the mode of the first aspect, different coil groups have similar ground impedance at the position of the bonding pad, the symmetry between different coil groups is further improved, and the longitudinal transfer loss of the common mode filter is reduced.
In a third aspect, an embodiment of the present application provides a terminal device, where the terminal device includes the common-mode filter of any one of the first aspect, the second aspect, or any one of the thirteen possible implementations.
These and other aspects of the present application will be more readily apparent from the following description of the embodiment(s).
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the application and, together with the description, serve to explain the principles of the application.
Fig. 1a, 1b, and 1c are schematic diagrams illustrating a routing structure of a common mode filter in the related art.
Fig. 1d shows a perspective view of a common mode filter according to an embodiment of the present application.
Fig. 1e shows a front view of a common-mode filter according to an embodiment of the application.
Fig. 1f shows a side view of a common-mode filter according to an embodiment of the application.
Fig. 1g shows a top view of a common-mode filter according to an embodiment of the application.
Fig. 1h shows a cross-sectional view of a common-mode filter according to an embodiment of the application.
Fig. 2a shows a cross-sectional view of a common-mode filter according to an embodiment of the application.
Fig. 2b shows a schematic structural diagram of a common mode filter according to an embodiment of the present application.
Fig. 2c shows a schematic structural diagram of one coil layer of the common mode filter according to an embodiment of the present application.
Fig. 3a shows a cross-sectional view of a common-mode filter according to an embodiment of the application.
Fig. 3b shows a schematic structural diagram of a common mode filter according to an embodiment of the present application.
Fig. 4 shows a schematic structural diagram of a common mode filter according to an embodiment of the present application.
Figure 5a shows a cross-sectional view of a common-mode filter according to an embodiment of the present application.
Fig. 5b shows a schematic structural diagram of a common mode filter according to an embodiment of the present application.
Fig. 6a, 6b show cross-sectional views of a common mode filter according to an embodiment of the present application.
Fig. 6c shows a schematic structural diagram of a common mode filter according to an embodiment of the present application.
Fig. 7a shows a cross-sectional view of a common-mode filter according to an embodiment of the application.
Fig. 7b shows a schematic structural diagram of a common mode filter according to an embodiment of the present application.
Fig. 7c shows a schematic structural diagram of a common mode filter according to an embodiment of the present application.
Fig. 8a shows a schematic structural diagram of a common mode filter according to an embodiment of the present application.
Fig. 8b shows a cross-sectional view of a common-mode filter according to an embodiment of the application.
Fig. 9a shows a schematic structural diagram of a common mode filter according to an embodiment of the present application.
Fig. 9b shows a cross-sectional view of a common-mode filter according to an embodiment of the application.
Fig. 10a shows a schematic structural diagram of a common mode filter according to an embodiment of the present application.
Fig. 10b shows a cross-sectional view of a common-mode filter according to an embodiment of the application.
Fig. 11a shows a schematic structural diagram of a common mode filter according to an embodiment of the present application.
Fig. 11b shows a cross-sectional view of a common-mode filter according to an embodiment of the present application.
Fig. 12 a-12 d show perspective, three-view views of a common-mode filter according to an embodiment of the application.
Fig. 13 a-13 d show perspective, three-view views of a common-mode filter according to an embodiment of the application.
Fig. 14a shows a cross-sectional view of a common-mode filter according to an embodiment of the application.
Fig. 14b shows a schematic diagram of a plurality of coil layers of a common mode filter according to an embodiment of the present application.
Detailed Description
Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present application. It will be understood by those skilled in the art that the present application may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present application.
In the related art, a common mode inductor (a kind of common mode filter) is generally composed of 2 coils, and the number of turns and the phase of the two coils are the same, and the two coils surround the same iron core. Because of the characteristic of common mode coil wound in the same phase, when equal amplitude and opposite phase differential mode current flows through the common mode inductor, the differential mode current can generate a reverse magnetic field in the coil, so that the magnetic fields are mutually offset, the inductance effect is reduced, the common mode inductor generally has no attenuation effect on the differential mode current, and the main factor influencing the differential mode current is the resistance of the common mode inductor coil. When common-mode current with equal amplitude and same phase flows through the common-mode inductor, because the common-mode current has the same directivity, the magnetic field generated in the common-mode inductor coil is also in the same direction, so that the inductive reactance of the common-mode inductor coil is increased, the coil has high impedance, a stronger damping effect can be generated, the common-mode current can be attenuated, and the filtering effect is realized. The common mode filter device with more than 2 wires (i.e. more than 2 coils) has a wide application prospect in high-speed data transmission, for example, a common mode filter of a data transmission mode facing a C-PHY Interface (PHY is a short for Port physical Layer, and C-PHY is a standard of the Port physical Layer specified by MIPI) of a Mobile Industry Processor Interface (MIPI) consists of 3 coils, and common mode noise can be filtered by coupling and pairwise differentiating the 3 coils. Fig. 1a, 1b, and 1c show schematic diagrams of a trace structure of a common mode filter in the related art. The traces labeled "a", "B", and "C" are traces of 3 different coil groups. As shown in fig. 1a, the traces of the three coil sets are arranged in an equilateral triangle, the traces of the "a" and "B" coil sets are on the same layer, and the traces of the "C" coil sets are on a single layer, so that the distances between the traces of the three coil sets relative to the ferrite are not consistent, which causes different phases between different coil sets, and when differential current signals flow through the common mode filter and perform pairwise differential operation, it is difficult to completely cancel the common mode current, so that part of the common mode current is converted into differential mode current, and differential mode noise is formed. As shown in fig. 1B, the traces of the three coil groups are also arranged in an equilateral triangle, and the traces of the three coil groups "a", "B", and "C" are not in the same layer, so that the distances between the traces of the three coil groups and the ferrite are not the same, which also causes the phase difference between different coil groups, thereby causing the problem of common mode skew. As shown in fig. 1C, the wires of the three coil groups "a", "B", and "C" are not in the same layer, the wire of one coil group is divided into two layers for winding, and the distances between the wires of the three coil groups and the ferrite are not the same, which also causes the phases of different coil groups to be different, thereby causing the problem of common mode differential mode. In summary, the common mode filter device with more than 2 lines in the related art has a problem of poor symmetry, and common mode noise is easily converted into differential mode noise, so that the filtering effect of the filter device on common mode interference noise is reduced. In general, the common mode transfer mode characteristic of the common mode filter is referred to as longitudinal transfer loss. How to provide a common mode filter with high symmetry and low longitudinal transfer loss is a technical problem to be solved urgently. In order to solve the above technical problem, the present application provides a common mode filter.
The utility model provides a common mode filter includes a plurality of coil groups, the first magnetic layer that is parallel to each other, second magnetic layer, first coil layer, middle coil layer, second coil layer, a plurality of line via holes of walking, first coil layer middle coil layer the second coil layer sets gradually first magnetic layer with between the second magnetic layer. The number of the coil groups can be at least 3, a plurality of wires of each coil group are respectively distributed in each coil layer, and then the lengths of the wires of different coil groups in the same coil layer, the relative position relation among the wires and the line width proportion of the wires are set, so that the common mode filter with high symmetry and low longitudinal transfer loss is obtained. The number of coil groups, the number of coil layers, the number and positions of routing through holes of common mode filters with different use requirements and other structural layout settings can be correspondingly adjusted, and a person skilled in the art can set the common mode filters according to requirements. When the number of the coil groups is greater than 3, a person skilled in the art may perform corresponding adjustment by referring to the layout setting of "setting 3 coil groups in the common mode filter", which is not described in detail herein.
Fig. 1d shows a perspective view of a common-mode filter according to an embodiment of the present application, and fig. 1e shows a front view of the common-mode filter according to an embodiment of the present application. Fig. 1f shows a side view of a common-mode filter according to an embodiment of the application. Figure 1g shows a top view of a common-mode filter according to an embodiment of the present application. Fig. 1h shows a cross-sectional view of the common mode filter according to an embodiment of the present application, and fig. 1h is a cross-sectional view taken along a position where a dashed box area s3 is located in fig. 1f, and only a portion related to the coil assembly is shown in the cross-sectional view 1h for facilitating understanding of the routing layout of the coil assembly in the present application. The dashed-line frame region s2 in fig. 1e, the dashed-line frame region s3 in fig. 1f, and the dashed-line frame region s1 in fig. 1g correspond to the same spatial region of the common mode filter.
An embodiment of the present application provides a common mode filter, as shown in fig. 1h, the common mode filter includes a plurality of coil groups (in fig. 1h, a difference between the wires of different coil groups is not shown), a plurality of wire vias, a first magnetic layer 11, a second magnetic layer 12, and a plurality of coil layers that are parallel to each other, where the plurality of coil layers include a first coil layer 21, a second coil layer 22, and one or more intermediate coil layers 23 (exemplarily illustrated in fig. 1h that the intermediate coil layers are a plurality of layers), and each coil layer is at least provided with a first wire, a second wire, and a third wire. The plurality of coil groups at least include a first coil group a, a second coil group B, and a third coil group C (since fig. 1h does not define the relative position relationship of the traces of different coil groups in the same coil layer, fig. 1h does not show the first coil group a, the second coil group B, and the third coil group C distinctively, but reference may be made to the illustrations in fig. 2a, 3a, 5a, 6B, 7a, and 14 a), and the plurality of trace vias at least include a first trace via, a second trace via, and a third trace via (not shown in fig. 1 h).
Wherein the first coil layer 21, the intermediate coil layer 23, and the second coil layer 22 are sequentially disposed between the first magnetic layer 11 and the second magnetic layer 12.
The first coil group a includes a first trace in each coil layer, that is, the first coil group a includes a first trace in the first coil layer 21, a first trace in the second coil layer 22, and a first trace in the middle coil layer 23. The second coil group B includes a second wire in each coil layer, that is, the second coil group B includes a second wire in the first coil layer 21, a second wire in the second coil layer 22, and a second wire in the middle coil layer 23. The third coil group C includes a third trace in each coil layer, that is, the third coil group C includes a third trace in the first coil layer 21, a third trace in the second coil layer 22, and a third trace in the intermediate coil layer 23.
The first routing via hole is used for connecting a plurality of first routing wires of the first coil group together, the second routing via hole is used for connecting a plurality of second routing wires of the second coil group together, and the third routing via hole is used for connecting a plurality of third routing wires of the third coil group together. At least two of the first wire, the second wire and the third wire in the same coil layer are wound in parallel.
In this embodiment of the present application, different coil groups are insulated from each other, and insulation between different coil groups may be achieved by increasing an insulating layer of an insulating material such as a dielectric on a surface of each trace, or by setting a space between different traces of the same coil layer and setting an insulating material such as a dielectric between adjacent coil layers, for example, the insulating material may be a resin material, a ceramic material, a polymer material, or the like, and a person skilled in the art may set a manner of achieving mutual insulation between different coil groups as needed, which is not limited in this application.
In the embodiment of the present application, the first routing via, the second routing via, and the third routing via disposed in each intermediate coil layer are not connected, do not contact, and are insulated from each other, so as to ensure mutual insulation between different coil groups. The material filled in the first routing via hole, the second routing via hole and the third routing via hole is metal, and can be completely the same as the routing material of the corresponding coil group, such as copper, silver, gold, tungsten and other metals with good conductivity, or different metals can be adopted with the routing of the corresponding coil group, such as copper metal for the routing material of the coil group, and silver metal for the filling material in the routing via holes, which is not limited in the present application.
In the embodiment of the present application, the material of the first magnetic layer 11 and the second magnetic layer 12 may be a magnetic material such as ferrite, such as an alloy, a monomer, or an oxide containing Fe, Co, Ni, Mn, etc., which is not limited in the present application. And, the first magnetic layer 11, the second magnetic layer 12, and adjacent ones of the plurality of coil layers (including the first coil layer 21, the second coil layer 22, and the one or more intermediate coil layers 23) are insulated from each other. The insulation between adjacent layers may be achieved by adding an insulating layer, and the material of the insulating layer may be an insulating material such as a resin material, a ceramic material, a polymer material, and the like, which is not limited in this application. The first magnetic layer and the second magnetic layer have spatial dimensions such as thickness, length, and width, and the thickness, length, and width of the first magnetic layer and the second magnetic layer may be set according to the limitation of the processing technology, the longitudinal transfer loss, the differential mode loss, the return loss, the index parameters of the impedance, and the like, which is not limited in this application. However, in order to simplify the structure of the common mode filter, strengthen the traces, and the position relationship of the layers in the common mode filter, the dimensions of the first magnetic layer and the second magnetic layer are not described in detail in the drawings of the present application, but this should not be considered as a limitation of the present application.
In an embodiment of the present application, the at least two parallel windings of the plurality of traces in the same coil layer may include: two or more traces are wound together in parallel, as shown in fig. 2b, 2c, and 3b below, each of which is a plurality of traces in each coil layer wound together in parallel. At least two parallel windings of the plurality of wires in the same coil layer may include all or a portion of each wire wound together in parallel participating in "all wires wound together in parallel", another portion participating in one or more other parallel windings of "all wires wound together in parallel". So that the distance between each wire in the same coil layer and the first magnetic layer is consistent, and the distance between each wire in the same coil layer and the second magnetic layer is also consistent (the distances between the plurality of wires in the same coil layer and the first magnetic layer and the second magnetic layer are different). The parallel winding of at least two wires in the same coil layer means that the wires needing parallel winding in the same coil layer are wound in parallel. The parallel winding wires have the same phase.
For example, as shown in fig. 2b and 2c below, the plurality of traces in each coil layer are all routed together in parallel and the full length of each trace participates in the parallel routing of the plurality of traces together. The plurality of traces in each coil layer shown in fig. 3b below are all routed in parallel together, but some traces cannot participate in parallel routing with all other traces in the same coil layer in full length due to the difference in trace lengths, and do not participate in the remaining length of "parallel routing with all other traces in the same coil layer", and continue to wind … … in parallel with one or more of the remaining traces until the full length is used up, and if the trace is the longest trace in the coil layer, the remaining portion of the trace cannot participate in any parallel routing. As in the "layer 1", the first wire a, the second wire b and the third wire c are wound together in parallel, but only the whole length of the shortest second wire b participates in the parallel winding of 3 wires together; a part of the first wire b participates in parallel winding of 3 wires together, and a part of the first wire b participates in parallel winding of the third wire c; the third wire c is partly involved in the parallel winding of 3 wires together, partly involved in the parallel winding with the second wire b and partly not. As shown in fig. 4, although all the wires in each coil layer are wound together in parallel, in the "layer 6", only a small part of the second wire b participates in the parallel winding of the three wires, and the rest part of the second wire b is wound together with the third wire c in parallel due to the length limitation of different wires; only a small part of the first wire a participates in parallel winding of the three wires, a large part of the first wire a is wound with the third wire c in parallel, and the other small part of the first wire a is not wound; only a small part of the third wire c participates in the parallel winding of the three wires together, the parallel winding with the first wire a and a small part of the third wire c does not carry out any winding.
It should be noted that, in the manufacturing process of the actual common mode filter, the plurality of coil layers, the first magnetic layer, and the second magnetic layer are in direct contact and closely attached together, and the distances between the different layers in the examples given in the various drawings of the present application are only for the purpose of more clearly illustrating the structure of the common mode filter, and are not limited in the present application.
The common mode filter is arranged in the mode of fig. 1h, so that the distances between all coil groups including at least the first coil group, the second coil group and the third coil group and the first magnetic layer and the second magnetic layer are respectively kept consistent under the same phase, thereby improving the symmetry among different coil groups and reducing the longitudinal transfer loss of the common mode filter.
Fig. 2a shows a cross-sectional view of a common mode filter according to an embodiment of the present application, and fig. 2b shows a schematic structural diagram of the common mode filter according to an embodiment of the present application. Fig. 2a is a cross-sectional view taken along the position of the dashed box area s3 in fig. 1h, and only the portion related to the coil assembly is shown in the cross-sectional view of fig. 2a for facilitating the understanding of the routing layout of the coil assembly in the present application. In one possible implementation, the relative positional relationship between the traces of different coil groups is the same in each coil layer. In the same coil layer, the central line of the wiring through hole of each coil group is positioned on the same cross section which is vertical to the coil layer. Wherein different sections of each trace in the same coil layer may be perpendicular, parallel or located on said cross section. A first relative position relationship exists between a first trace belonging to the first coil group a, a second trace belonging to the second coil group B, and a third trace belonging to the third coil group C in the first coil layer 21. And a second relative position relationship is formed among a first wire belonging to the first coil group A, a second wire belonging to the second coil group B and a third wire belonging to the third coil group C in the second coil layer. And a middle relative position relationship is formed among a first wire belonging to the first coil group A, a second wire belonging to the second coil group B and a third wire belonging to the third coil group C in the middle coil layer. As shown in fig. 2a and 2b, the first relative positional relationship, the second relative positional relationship and the middle relative positional relationship are the same, and the center lines of the first routing via Aa, the second routing via Bb and the third routing via Cc for realizing the routing connection in the adjacent coil layers are all located on the same cross section perpendicular to each coil layer. In fig. 2b, the "circular dashed frame" disposed on the trace is the position of the via hole of the trace connected to the trace.
As shown in fig. 2b, in each coil layer, the traces marked as "a", "b", and "c" are the first trace, the second trace, and the third trace of the coil layer where the trace is located, that is, the first trace is "a", the second trace is "b", and the third trace is "c", and then the multiple traces of the first coil group a are the traces marked as "a" in the first coil layer "1 st layer", the multiple intermediate coil layers "2 nd to 5 th layers", and the second coil layer "6 th layer". The plurality of wires of the second coil group B are the wires marked as "B" in the first coil layer "1 st layer", the plurality of intermediate coil layers "2 nd to 5 th layers", and the second coil layer "6 th layer". The plurality of traces of the third coil group C are the traces marked as "C" in the first coil layer "1 st layer", the plurality of intermediate coil layers "2 nd to 5 th layer", and the second coil layer "6 th layer".
In this implementation manner, the first relative positional relationship, the second relative positional relationship, and the middle relative positional relationship may refer to an adjacent relationship, and the like between the traces, as shown in fig. 2b, that is, in each of the first coil layer "1 st layer", the plurality of middle coil layers "2 nd layer to 5 th layer", and the second coil layer "6 th layer", the first relative positional relationship, the second relative positional relationship, and the middle relative positional relationship are the same, and are the relative positional relationship in which the first trace a is at the outermost side, the third trace c is at the innermost side, the second trace b is between the first trace a and the third trace c, that is, the three traces are "a-b-c".
In this implementation manner, as shown in fig. 2B, taking "layer 3" in the intermediate coil layer 23 and the first trace via Aa, the second trace via Bb, and the third trace via Cc "for implementing the trace connection between" layer 2 "and each coil group in layer 3 as an example, the first trace via Aa of the first coil group a, the first trace via Bb of the second coil group B, and the first trace via Cc of the third coil group C are disposed between" layer 3 "and" layer 2 ", and the center lines (i.e. the dotted lines shown in fig. 2B) of the first trace via Aa, the second trace via Bb, and the third trace via Cc all lie in the same cross section M, and the cross section M itself is perpendicular to each coil layer. Since the first trace a, the second trace b, and the third trace c in the "layer 3" all have a plurality of different segments, taking the first trace a in the "layer 3" as an example, the first trace a includes segments a1, a2, a3, a4, a5, where segment a1 is perpendicular to the cross section M, segment a2 is parallel to the cross section M, segment a3 is perpendicular to the cross section M, segment a4 is parallel to the cross section M, and segment a5 is perpendicular to the cross section M. Similarly, the center lines of the "first routing via Aa, the second routing via Bb, and the third routing via Cc connected to the routing of each coil group in the layer 1 and the layer 2", "the first routing via Aa, the second routing via Bb, and the third routing via Cc connected to the routing of each coil group in the layer 3 and the layer 4", "the first routing via Aa, the second routing via Bb, and the third routing via Cc connected to the routing of each coil group in the layer 4 and the layer 5", "the first routing via Aa, the second routing via Bb, and the third routing via Cc connected to the routing of each coil group in the layer 5 and the layer 6" are also on the corresponding cross sections thereof, respectively.
It should be noted that, in fig. 2b and the following fig. 3b, fig. 4, fig. 5b, fig. 6c, fig. 7 b-fig. 7c, and fig. 14b of the present application, in order to simplify the winding manner of the multiple coil group wires and clearly illustrate the winding structure, the number of turns of the first wire, the second wire, and the third wire of each coil layer is less than 2 turns, and the number of turns of the first wire, the second wire, and the third wire of each coil layer in actual production and manufacturing may be any number of turns of 1 turn or more. In order to avoid the stress problem caused by the point discharge and the right-angle turn, the differential loss and the return loss of the common mode filter are also reduced, and the corner position of the wire during winding may be rounded (as shown in fig. 2c below).
In this implementation, the number of layers of the plurality of coil layers may be set according to the limitations of index parameters of the longitudinal transfer loss, the differential mode loss, the return loss, and the impedance of the common mode filter.
In this implementation manner, the first routing via Aa, the second routing via Bb, and the third routing via Cc required for routing connection of the coil groups between two adjacent coil layers (the first coil layer and the adjacent intermediate coil layer, the second coil layer and the adjacent intermediate coil layer, and the two adjacent intermediate coil layers) may be disposed in any one of the two coil layers, or disposed between the two coil layers, or the first routing via Aa, the second routing via Bb, and the third routing via Cc may penetrate through each coil layer. The connection positions (the positions where the routing via contacts the coil layer) of the first routing via Aa, the second routing via Bb, and the third routing via Cc in different coil layers may be the same or different. The arrangement positions of the first routing via hole Aa, the second routing via hole Bb and the third routing via hole Cc can be set according to actual needs, and the electric connection of each routing line in the first coil group, the second coil group and the third coil group can be realized only by ensuring the first routing via hole Aa, the second routing via hole Bb and the third routing via hole Cc, so that the present application does not limit the present invention. For example, the first trace via Aa, the second trace via Bb, and the third trace via Cc required for electrically connecting the coil group traces between the first coil layer and the adjacent intermediate coil layer may be disposed in the intermediate coil layer, may also be disposed in the first coil layer, and may also be disposed between the first coil layer and the intermediate coil layer. The first routing via Aa, the second routing via Bb and the third routing via Cc required for the routing connection of the coil group between the second coil layer and the adjacent middle coil layer may be disposed in the middle coil layer, may also be disposed in the second coil layer, and may also be disposed between the middle coil layer and the second coil layer. The first routing via Aa, the second routing via Bb, and the third routing via Cc required for routing connection of the coil group between two adjacent intermediate coil layers may be disposed at any one of the two intermediate coil layers, or may be disposed between the two intermediate coil layers. It should be noted that, in fact, different coil layers are in direct contact and tightly attached together, in the example given in fig. 2b of the present application, the lengths of the first routing via Aa, the second routing via Bb, and the third routing via Cc are far longer than the thickness of the coil layer only to illustrate the structure of the common mode filter more clearly, and the actual lengths of the first routing via Aa, the second routing via Bb, and the third routing via Cc in the common mode filter are not and are not limited.
The common mode filter is arranged in the mode of fig. 2a and 2b, so that the distances between all the coil groups and the first magnetic layer and the second magnetic layer are kept consistent under the same phase; compared with the common mode filter arranged in the mode of fig. 1h, in each coil layer, the relative position relationship between the wires of different coil groups is the same, so that the symmetry between the different coil groups can be further improved, and the longitudinal transfer loss of the common mode filter can be further reduced.
In the embodiment of the application, each of the wires of different coil groups has a thickness and a width, and a wire pitch may also be provided between adjacent wires in the same coil layer, and the thickness and the width of the wire and the wire pitch may be set according to index parameters of longitudinal transfer loss, differential mode loss, return loss and impedance, processing process limitations and the like of the common mode filter. The common mode filter for the terminal equipment has the appearance of 0.1mm-1mm in length, width and thickness, namely the three-dimensional space occupied by the common mode filter has the length, width and height of 0.1mm-1 mm. Taking the length, width and thickness of the common mode filter as 1mm as an example, when the common mode filter adopts a Low Temperature Ceramic sintering (LTCC), a thin film bonding process and an Integrated Passive Device (IPD) process, the width of the wires is 5 μm to 30 μm and the pitch of the wires is 5 μm to 30 μm under the limitations of the process, the size of the common mode filter, the longitudinal transfer loss, the differential mode loss, the return loss and the impedance. The thickness of the trace can be 0.1 μm to 10 μm when the trace is manufactured by printing or electroplating. Those skilled in the art can set the trace thickness, the trace width, and the trace pitch according to the actual design requirement of the common mode filter, which is not limited in this application. In consideration of the common mode filter application, it is necessary to ensure that its impedance is small, i.e. the differential mode loss is small, i.e. the differential mode current is not lost. Therefore, when the common mode filter is manufactured, the distance between the wiring layers is large enough to avoid stray capacitance, the wiring layers are thick to avoid overlarge direct current resistance. In addition, the common mode filter should have a specific filtering frequency band, and the adjustment and control of the filtering frequency band are usually realized by adding ferromagnetic materials on the upper and lower surfaces of the common mode filter, wherein the ferromagnetic materials have a certain loss tangent which is in a function relationship with frequency, and the loss tangent value is larger at certain frequencies. If a common mode noise current flows through the common mode filter, the magnetic field generated by the common mode current is dissipated in the ferromagnetic material as heat energy. Moreover, the common mode filter provided by the application can be manufactured independently, the manufactured common mode filter is relatively large in size, the design requirements of the manufactured common mode filter on the thickness and the width of the wiring can be met only possibly, the manufacturing of the common mode filter can be realized by adopting various manufacturing processes, and the manufactured common mode filter is low in resource cost, time cost and reliability.
In one possible implementation manner, the trace widths of different traces in each coil layer in the common mode filter are set according to a preset width proportional relationship.
Wherein, the width proportional relation may include any one of the following: the plurality of coil groups comprise one or more target coil groups and at least two coil groups with the same width, the routing of different coil groups with the same width has the same first routing width, and the second routing width of the routing of each target coil group has different first width proportional relation with the first routing width; the plurality of coil groups comprise one or more target coil groups and at least two coil groups with the same width, the wires of different coil groups with the same width have the same first wire width, the wires of different target coil groups have the same second wire width, and a second width proportional relation exists between the second wire width and the first wire width; the wiring widths of the wirings of each coil group are different from each other, and a third width proportional relationship exists between the wiring widths of the wirings of different coil groups; and a corresponding fourth width proportional relation exists between the wire widths of different wires in each coil layer.
The width of the wire of each coil group may be the width of all wires of the coil group in different coil layers. Different wires of the same coil group can be set to have the same wire width, and different wires of the same coil group can also be set to have incomplete or different wire widths. When different wires of the same coil group have the same wire width, if the width proportional relationship is set, the first wire width of the coil group with the same width can be determined, and then the wire width of the target coil group is adjusted according to the width proportional relationship. The width proportional relationship between the first trace width W1 and the second trace width W2 is: w1 is p1 XW 2, p1 is proportionality coefficient, and p 1E [0.5,0.8] or p 1E [2,3 ]. A plurality of lines in the same coil layer can be set to have incomplete consistent line width, a reference line can be determined in the plurality of lines, and the fourth proportional relation between the line width w1 of the reference line and the line width w2 of the rest lines is as follows: w1 ═ P1 xw 2, P1 is a proportionality coefficient, and P1 ∈ [0.5,0.8] or P1 ∈ [2,3 ].
Therefore, due to the fact that the wiring width of each coil group is set according to the preset width proportional relation, the difference of the length sum of a plurality of wirings in different coil groups, the difference of the thickness of the wirings of different coil groups due to processing technology, the impedance difference caused by the fact that the phases of the wirings of different coil groups are different due to the position setting of the wiring through holes and the like can be further improved, the wiring width of different coil groups can be adjusted by adjusting the width proportional relation, different coil groups have similar or same characteristic impedance, the symmetry between different coil groups is improved, and the longitudinal transfer loss of the common mode filter is reduced. Under the condition that the thicknesses of the wires are the same, the smaller the width of the wires, the larger the corresponding impedance, because the impedance value is in inverse proportion to the sectional area of the wires, the smaller the width of the wires, the smaller the sectional area of the wires.
For convenience of describing different arrangement modes of the width proportional relationship, the following description will be given by taking an example in which the plurality of coil groups include a first coil group a, a second coil group B, and a third coil group C. Fig. 2c shows a schematic structural diagram of one coil layer of the common mode filter according to an embodiment of the present application. Fig. 2c differs from fig. 2b in that the track width is set in fig. 2c, and the track corners are set to be circular arcs, so only the track of the first coil layer "layer 1" is shown in fig. 2 c. The number of the target coil groups is only one, and the other coil groups except for the 'one target coil group' in the plurality of coil groups are all coil groups with the same width. As shown in fig. 2C, when the plurality of coil groups include a first coil group a, a second coil group B, and a third coil group C, any one of the first coil group a, the second coil group B, and the third coil group C may be selected as a target coil group, and the other coil groups may be selected as the same-width coil group, and if the third coil group C is the target coil group and the first coil group a and the second coil group B are the same-width coil group, W1a ═ W1B ═ p1 ═ W2C, and p1 ∈ [0.5,0.8 ]. The first wire a of the first coil group A, the second wire B of the second coil group B and the third wire C of the third coil group C are arranged in sequence from outside to inside, and the number of winding turns is more than 1 turn, so that the wire width of the first wire a and the second wire B can be reduced selectively; the reason why the impedance cannot be adjusted by increasing the width of the third wire c is that, under the condition that the wire pitches of the first wire a, the second wire b and the third wire c are the same and the coupling conditions are the same, the width of the third wire c is increased, so that the third wire c is coupled with the first wire a more closely, and even the third wire c and the first wire a are connected to cause short circuit.
In the description of the embodiments of the present application, the traces shown in fig. 3b, fig. 4, fig. 5b, fig. 6c, fig. 7b, fig. 7c, fig. 8a, fig. 9a, fig. 10a, fig. 11a, and fig. 14b are all traces having a thickness and a width as shown in fig. 2b, but in order to simplify the structure of the common mode filter, the reinforcing traces, and the positional relationship of the layers in the common mode filter, the traces are only illustrated as "lines" having a width in fig. 3b, fig. 4, fig. 5b, fig. 6c, fig. 7b, fig. 7c, fig. 8a, fig. 9a, fig. 10a, fig. 11a, and fig. 14 b.
In the example shown in fig. 2b of the present application, the diameters of the first routing via Aa, the second routing via Bb, and the third routing via Cc are the same as the widths of the routing lines connected thereto, and actually, the diameters of the routing vias may be set according to processing technologies (such as laser perforation, photolithography, and other processing technologies), electrical connection requirements between the routing lines, and the widths of the routing lines, and the diameters of the routing vias may be greater than, smaller than, or equal to the widths of the routing lines connected thereto, which is not limited by the present application. Similarly, in fig. 3b, 4, 5b, 6c, 7b, 7c, 8a, 9a, 10a, 11a, and 14b, two ends of each trace of the intermediate coil layer, one end of each trace of the first coil layer, and one end of each trace of the second coil layer are respectively drawn with a trace via (i.e. circular representations with different gray scales are shown in the figures), in order to indicate the position of the trace via, the diameter of the trace via is larger than the width of the trace connected with the trace via, however, in practice, the diameter of the trace via may be larger than, smaller than, or equal to the width of the trace connected thereto, i.e. the size relationship between the diameter of the trace via and the width of the trace connected thereto as shown in fig. 2b, 3b, 4, 5b, 6c, 7b, 7c, 8a, 9a, 10a, 11a, 14b is not limited in this application.
Fig. 3a shows a cross-sectional view of a common mode filter according to an embodiment of the present application, and fig. 3b shows a schematic structural diagram of the common mode filter according to an embodiment of the present application. Fig. 3a is a cross-sectional view taken along the position of the dashed box area s3 in fig. 1f, and only the portion related to the coil assembly is shown in the cross-sectional view of fig. 3a for facilitating the understanding of the routing layout of the coil assembly in the present application. In a possible implementation manner, the total lengths of the windings among different coil groups are similar to each other, the total length is the total length of the plurality of wires in the same coil group, and the relative position relationships among the wires of different coil groups in each coil layer are not consistent. As shown in fig. 3a and 3B, a first relative position relationship exists between the first trace belonging to the first coil group a, the second trace belonging to the second coil group B, and the third trace belonging to the third coil group C in the first coil layer 21. And a second relative position relationship is formed among a first wire belonging to the first coil group A, a second wire belonging to the second coil group B and a third wire belonging to the third coil group C in the second coil layer. And a middle relative position relationship is formed among a first wire belonging to the first coil group A, a second wire belonging to the second coil group B and a third wire belonging to the third coil group C in the middle coil layer. The first relative position relationship, the second relative position relationship and the middle relative position relationship are not consistent, and the first length sum of the multiple routing wires of the first coil group a, the second length sum of the multiple routing wires of the second coil group B and the third length sum of the multiple routing wires of the third coil group C are the same.
In this implementation manner, in the actual processing process of the common mode filter, the first length sum, the second length sum, and the third length sum are affected by the processing technology, and the three cannot be actually completely the same, so that in the present application, "the first length sum, the second length sum, and the third length sum are the same" is a theoretical state, and "the first length sum, the second length sum, and the third length sum" in the actually manufactured common mode filter are substantially the same, substantially similar, and approximately the same. Or, length differences may be set according to index requirements related to the common mode filter, such as differential mode loss, longitudinal transfer loss, required total lengths of the windings of the multiple wires of each coil group, and the like, so that the actual length differences among the first length sum, the second length sum, and the third length sum are all smaller than or equal to the length differences, thereby ensuring that the winding length sums among different coil groups are as the same as possible, and further improving symmetry among different coil groups. The smaller the length difference, the closer the sum of the lengths of the winding wires of different coil groups (i.e. the closer the sum of the first length, the sum of the second length, and the sum of the third length), the better the symmetry between different coil groups.
In this implementation manner, as shown in fig. 3a and fig. 3b, the relative positional relationship between the traces of different coil groups in each coil layer is not consistent, and may be "a-b-c" for the relative positional relationship between the first trace a, the second trace b and the third trace c in "layer 1" (first coil layer 21), "c-a-b" for the relative positional relationship between the first trace a, the second trace b and the third trace c in "layer 2" (intermediate coil layer 23), "b-c-a" for the relative positional relationship between the first trace a, the second trace b and the third trace c in "layer 3" (intermediate coil layer 23), "c-a" for the relative positional relationship between the first trace a, the second trace b and the third trace c in "layer 4" (intermediate coil layer 23), the relative position relationship of the first wire a, the second wire b and the third wire c in the "5 th layer" (the middle coil layer 23) is "b-c-a", and the relative position relationship of the first wire a, the second wire b and the third wire c in the "6 th layer" (the second coil layer 22) is "a-b-c". That is, in the plurality of coil layers, there are a plurality of layers "layer 1 and layer 6" in which the relative positional relationship of the first trace a, the second trace b, and the third trace c is the same, but the relative positional relationship of the first trace a, the second trace b, and the third trace c in all the coil layers is not completely consistent, for example, the relative positional relationship of the first trace a, the second trace b, and the third trace c in the layer 1 and layer 6, the layer 3 and layer 5, the layer 2 and layer 4 is respectively the same, and the remaining different layers are different.
In this implementation manner, the number of layers of the plurality of coil layers and the total length of the windings of each coil group may be set according to the limitations of index parameters of the longitudinal transfer loss, the return loss, and the impedance of the common mode filter, which is not limited in this application.
Arranging the common mode filter in the manner shown in fig. 3a and 3b so that the distances between all the coil sets and the first magnetic layer and the second magnetic layer are consistent under the same phase; compared with the common mode filter arranged in the mode of fig. 2a and 2b, the total sum of the winding lengths of the different coil groups is similar by changing the relative position relationship (namely changing the first relative position relationship, the second relative position relationship and the middle relative position relationship) between the wires of the different coil groups in each coil layer, so that the symmetry between the different coil groups is further improved, and the longitudinal transfer loss of the common mode filter is reduced.
In a possible implementation manner, fig. 4 shows a structural schematic diagram of a common mode filter according to an embodiment of the present application, and the arrangement manner of different coil groups in the plurality of coil layers shown in fig. 4 is different from that of fig. 3a and 3b in that the relative position relationship between the traces is different. As shown in fig. 4, the first relative positional relationship, the second relative positional relationship and the middle relative positional relationship are the same, and a first total length of the plurality of traces of the first coil group, a second total length of the plurality of traces of the second coil group and a third total length of the plurality of traces of the third coil group are the same.
In this implementation manner, as shown in fig. 4, the relative positional relationship among the first trace a, the second trace b, and the third trace c in each coil layer is the same (that is, the first relative positional relationship, the second relative positional relationship, and the middle relative positional relationship are the same). In order to meet the requirement that the total lengths of the windings in different coil groups are the same, the first, second and/or third windings in the same coil group may be greater than or equal to one full turn, or may not meet one full turn, that is, the lengths of the first, second and third windings in the same coil layer are not limited.
The common mode filter is arranged in the manner shown in fig. 4, so that the distances between all the coil groups and the first magnetic layer and the second magnetic layer are kept consistent in the same phase, and compared with the common mode filter arranged in the manner shown in fig. 2a and 2b, on the premise that the relative position relationship between the wires of different coil groups in each coil layer is kept the same, the total sum of the wire winding lengths between different coil groups is made the same by changing the lengths of the wires in different coil layers, the symmetry between different coil groups is further improved, and the longitudinal transfer loss of the common mode filter is reduced.
On the basis of the above-mentioned several common mode filters provided in fig. 2a, 2b, 3a, 3b, and 4, in the present application, the common mode filter may further include a ground reference structure, where the ground reference structure is insulated from each first trace, each second trace, and each third trace, and the ground reference structure is insulated from the first magnetic layer and the second magnetic layer. The ground reference structure may be a "ground reference" routed in each coil assembly by connecting to a ground pin, grounding empty or floating, etc., which is not limited in this application. Through the arrangement of the ground reference structure, different coil groups can have similar or even the same ground matching impedance, so that the symmetry between the different coil groups is further improved, and the longitudinal transfer loss of the common mode filter is reduced.
The implementation manner of the ground reference structure may include the implementation manner of the first mode and the second mode, and the setting of the ground reference structure in the common mode filter may be performed in one or more of the first mode and the second mode.
Alternatively, the reference ground structure may be one or more internal reference ground layers located inside the common mode filter, such as the "metal reference ground layer" described below.
In a second mode, the ground reference structure may be one or more internal ground reference layers located inside the common mode filter, and at least one ground reference line for providing a "ground reference" for the trace in the coil layer adjacent to the ground reference layer is disposed in the ground reference layer. Each coil layer can be provided with a corresponding reference ground lead layer; corresponding reference ground lead layers can also be arranged for part of the coil layers; it is also possible to provide a corresponding reference ground conductor layer for part of the coil layers and to use this as the "reference ground" for the entire coil layer. The "first auxiliary layer, second auxiliary layer" as described below is a "reference ground" for all coil layers.
In a third way, the reference ground structure may be one or more companion reference ground lines located in the coil layer of the common mode filter, as described below as "first companion reference ground line, intermediate companion reference ground line and second companion reference ground line".
In a fourth mode, the ground reference structure may be a surface ground reference structure located on the surface of the common mode filter, such as "metal ground reference cladding layer" and "metal ground reference strip" described below.
It is understood that, a person skilled in the art may set the position of the ground reference structure in the common mode filter, the structure and the size of the ground reference structure, etc. as needed, as long as the ground reference structure is ensured to provide a ground reference for the routing of the coil groups, and different coil groups can have similar or even the same ground matching impedance, which is not limited in this application. A
Fig. 5a shows a cross-sectional view of a common mode filter according to an embodiment of the present application, and fig. 5b shows a schematic structural diagram of the common mode filter according to an embodiment of the present application. Fig. 5a is a sectional view taken along the position of the dashed box area s3 in fig. 1c, and only the part related to the coil assembly is shown in the sectional view of fig. 5a for the convenience of understanding the routing layout of the coil assembly in the present application. In one possible implementation, as shown in fig. 5a, 5b, the reference ground structure may comprise a first auxiliary layer 31 and a second auxiliary layer 32. The first auxiliary layer 31 is located between the first coil layer 21 and the first magnetic layer 11, and the first auxiliary layer 31 is isolated from the first coil layer 21 by an insulating medium, so as to prevent the first auxiliary layer 31 from being electrically connected to the first coil layer 21. The first auxiliary layer 31 is provided with a first reference ground line 41 corresponding to the first trace a, the second trace b, and the third trace c of the first coil layer 21, that is, the first reference ground line 41 includes: the reference ground segment Da of the first track a in the first coil layer 21, the reference ground segment Db of the second track b in the first coil layer 21 and the reference ground segment Dc of the third track c in the first coil layer 21. The second auxiliary layer 32 is located between the second coil layer 22 and the second magnetic layer 12, and similarly, the second auxiliary layer 32 is isolated from the second coil layer 22 by an insulating medium to prevent the second auxiliary layer 32 from being electrically connected to the second coil layer 22. The second auxiliary layer 32 is provided with a second reference ground line 42 corresponding to the first trace a, the second trace b, and the third trace c in the second coil layer 22, that is, the second reference ground line 42 includes: a reference ground line segment Fa of the first trace a in the second coil layer 22, a reference ground line segment Fb of the second trace b in the second coil layer 22, and a reference ground line segment Fc of the third trace c in the second coil layer 22.
In this implementation, the first auxiliary layer 31 and the second auxiliary layer 32 may be electrically connected by an auxiliary layer via; the first auxiliary layer 31 and the second auxiliary layer 32 may also be "suspended" between the magnetic layer and the coil layer, i.e. both need not be electrically connected. When electrically connected through the auxiliary layer via, the auxiliary layer via cannot be electrically connected with any trace and trace via in the coil layer.
For convenience of describing the arrangement of the first auxiliary layer 31 and the second auxiliary layer 32 in the common mode filter, only the arrangement of the first auxiliary layer 31 and the second auxiliary layer 32 is described in fig. 5a and 5b by taking "fig. 3a and 3 b" as an example, and a person skilled in the art may add the first auxiliary layer 31 and the second auxiliary layer 32 in the common mode filter of "fig. 2a, 2b, and" fig. 4 "according to the arrangement of the first auxiliary layer 31 and the second auxiliary layer 32 in fig. 5a and 5b, which is not described herein again.
In this implementation, as shown in fig. 5a and 5b, the position and layout of each reference ground line segment in the first reference ground line 41 and the second reference ground line 42 are the same as those of its corresponding trace, so as to ensure that there is similar impedance to ground between different coil groups.
Setting the common mode filter in the manner shown in fig. 5a and 5b so that the distances between all the coil sets and the first magnetic layer and the second magnetic layer are consistent under the same phase; compared with the common mode filter which is arranged in a manner without adding the first auxiliary layer and the second auxiliary layer (namely, in a manner corresponding to fig. 2a, 2b, 4 and the like) in fig. 3a, 3b and the like, the first auxiliary layer and the second auxiliary layer with the reference ground wire are arranged, so that the different coil groups have similar ground impedances to each other, the symmetry among the different coil groups is further improved, and the longitudinal transfer loss of the common mode filter is reduced.
On the basis of the common mode filters provided in fig. 2a, 2b, 3a, 3b, and 4, fig. 6a and 6b show cross-sectional views of the common mode filter according to an embodiment of the present application, and fig. 6c shows a schematic structural diagram of the common mode filter according to an embodiment of the present application. Fig. 6a and 6b are cross-sectional views taken along the position of the dashed box area s3 in fig. 1f, and only the portions related to the coil assembly are shown in the cross-sectional views 6a and 6b for facilitating the understanding of the routing layout of the coil assembly in the present application. In one possible implementation, as shown in fig. 6a, 6b, and 6c, the reference structure may include: the first coil layer 21 is provided with a first companion reference ground line 51 of one or more of a first trace a, a second trace b and a third trace c of the first coil layer 21, and the first companion reference ground line 51 is located on one side or two sides of a first target trace. The middle accompanying reference ground line 53 of one or more middle target wires among the first wire a, the second wire b, and the third wire c of the middle coil layer 23 is disposed in the middle coil layer 23, and the middle accompanying reference ground line 53 is located at one side or two sides of the middle target wire. A second accompanied reference ground line 52 of one or more second target wires among the first wire a, the second wire b, and the third wire c of the second coil layer 22 is disposed in the second coil layer 22, and the second accompanied reference ground line 52 is located at one side or two sides of the second target wires. The first accompanying reference ground line, the middle accompanying reference ground line and the second accompanying reference ground line may be made of the same metal as that of the trace, or may be made of different metals.
Fig. 6a and 6c only show that the first accompanied ground reference line 51 is disposed on one side (outer side) of the first trace a, the second trace b, and the third trace c of the first coil layer 21, that is, the first trace a, the second trace b, and the third trace c of the first coil layer 21 are the first target trace; a second companion reference ground line 52 is disposed at one side (outer side) of the first trace a, the second trace b, and the third trace c of the second coil layer 22, that is, the first trace a, the second trace b, and the third trace c of the second coil layer 22 are second target traces; a middle accompanied ground reference line 53 is disposed on one side (outer side) of the first trace a, the second trace b, and the third trace c of the middle coil layer 23, that is, the first trace a, the second trace b, and the third trace c of the middle coil layer 23 are middle target traces. Fig. 6b only shows that the first companion ground reference lines 51 are disposed on two sides of the first trace a, the second trace b, and the third trace c of the first coil layer 21, that is, the first trace a, the second trace b, and the third trace c of the first coil layer 21 are the first target traces; second companion reference ground lines 52 are arranged on two sides of the first trace a, the second trace b and the third trace c of the second coil layer 22, that is, the first trace a, the second trace b and the third trace c of the second coil layer 22 are second target traces; the middle companion ground line 53 is disposed on two sides of the first trace a, the second trace b, and the third trace c of the middle coil layer 23, that is, the first trace a, the second trace b, and the third trace c of the middle coil layer 23 are middle target traces. For the other arrangements of the first associated reference ground line 51, the second associated reference ground line 52 and the intermediate associated reference ground line 53, the layouts may be made by referring to the examples given in fig. 6a, fig. 6b and fig. 6c, which are not described in detail herein.
In this implementation manner, in the actual wiring process, according to the layout settings of the first trace, the second trace, and the third trace in different coil layers and the usage requirements of the common mode filter that need to be met by the setting of the accompanying reference ground line, the position of the accompanying reference ground line in each coil layer and which trace of the accompanying reference ground line, the accompanying first trace, the second trace, and the third trace is set, that is, the setting conditions of the accompanying reference ground line in different coil layers may be the same or different. Thus, the symmetry of different coil groups can be improved, and the different coil groups have similar ground impedance. Technical personnel in this field can be according to actual need in each coil layer first walk line, second walk line, the third is walked line and is set up and adjust along with reference ground wire, one side setting or both sides setting, inboard setting or outside setting etc. this application does not limit to this.
For example, assume that the plurality of coil layers are: layer 1, layer 2 …, layer 6, where layer 1 is the first coil layer, layers 2-5 are the intermediate coil layers, and layer 6 is the second coil layer. The first companion ground reference line 51 may be disposed only on one side of the first trace a in the "layer 1", the intermediate companion ground reference line 53 may be disposed only on both sides of the first trace a in the "layer 2", the intermediate companion ground reference line 53 may be disposed only on both sides of the first trace a and the second trace b in the "layer 3", the intermediate companion ground reference line 53 may be disposed only on both sides of the first trace a, the second trace b, and the third trace c in the "layer 4", the intermediate companion ground reference line 53 may be disposed only on the outer sides of the first trace a, the second trace b, and the third trace c in the "layer 5", and the second companion ground reference line 52 may be disposed only on the inner sides of the first trace a, the second trace b, and the third trace c in the "layer 6".
The common mode filter is arranged in the manner shown in fig. 6a, 6b and 6c, so that the distances between all the coil groups and the first magnetic layer and the second magnetic layer are consistent in the same phase, and compared with the common mode filter arranged in the manner that an accompanying reference ground line is not added (namely, the manner corresponding to fig. 2a, 2b, 3a, 3b and the like) in fig. 4 and the like, the first accompanying reference ground line, the second accompanying reference ground line and the intermediate accompanying reference ground line are arranged, so that the different coil groups have similar ground impedance, the symmetry between the different coil groups is further improved, and the longitudinal transfer loss of the common mode filter is reduced.
In one possible implementation, the companion reference ground lines in different coil layers may or may not be connected together, i.e., the first companion reference ground line, the intermediate companion reference ground line, and the second companion reference ground line. Some or all of the first, intermediate and second companion ground reference lines may or may not be connected together depending on the impedance to ground of the different coil groups. When the connection between the first accompanying reference ground line, the intermediate accompanying reference ground line and the second accompanying reference ground line is required, the connection between the accompanying reference ground lines may be realized by providing through holes in the corresponding coil layers, or the connection between the first accompanying reference ground line, the intermediate accompanying reference ground line and the second accompanying reference ground line may also be realized by external wires. The material of the first, intermediate and second companion ground reference lines may be a metal. In this way, it is further ensured that there is a similar impedance to ground between the different coil groups, compared to not connecting together the first, intermediate and second companion reference ground lines.
In one possible implementation, the reference ground structure may include at least one of the following metal reference formations:
a first metal reference ground layer located between the first coil layer and the first magnetic layer.
A second metal reference ground layer located between the second coil layer and the second magnetic layer.
And the third metal reference stratum is positioned between the first coil layer and the middle coil layer and is provided with a first containing hole for containing the first routing through hole, the second routing through hole and the third routing through hole which pass through the third metal reference stratum.
And the fourth metal reference stratum is positioned between the second coil layer and the middle coil layer and is provided with a first wiring through hole, a second wiring through hole and a second holding hole for holding the third wiring through hole which pass through the third metal reference stratum.
The middle metal reference stratum comprises one or more middle metal reference stratums, each middle metal reference stratum is located between two middle coil layers and is provided with a first routing through hole, a second routing through hole and a third containing hole, and the first routing through hole, the second routing through hole and the third routing through hole are contained in the third metal reference stratum.
In this implementation, the number and the type of the metal reference formations may be determined according to the magnitude of the impedance to ground difference between different coil groups after the different types of the metal reference formations are set. For example, on the basis of the common mode filters provided in fig. 2a, 2b, 3a, 3b, and 4, fig. 7a shows a cross-sectional view of the common mode filter according to an embodiment of the present application, and fig. 7b shows a schematic structural diagram of the common mode filter according to an embodiment of the present application. Fig. 7a is a cross-sectional view taken along the position of the dashed-line area s3 in fig. 1f, and only the portion related to the coil assembly is shown in the cross-sectional view of fig. 7a for facilitating the understanding of the routing layout of the coil assembly in the present application. As shown in fig. 7a and 7b, the common mode filter includes 6 coil layers of "layer 1 and layer 2 …, layer 6", wherein the "layer 1" is the first coil layer, the "layers 2 to 5" are the middle coil layers, and the "layer 6" is the second coil layer. The reference ground structure comprises a first metal reference formation 61, a second metal reference formation 62, a third metal reference formation 63, a fourth metal reference formation 64 and three intermediate metal reference formations 65. The third metal reference ground layer 63 is further provided with a first routing through hole, a second routing through hole, and a first receiving hole 630 corresponding to the first routing through hole, the second routing through hole, and the third routing through hole for realizing the "routing connection of the coil group between the layer 1 and the layer 2". The fourth metal reference ground layer 64 is further provided with a second accommodating hole 640 corresponding to the first routing via hole, the second routing via hole, and the third routing via hole for realizing "routing connection of coil groups between the 5 th layer and the 6 th layer". The three middle metal reference strata 65 are further respectively provided with a third accommodating hole 650 corresponding to a first routing via hole, a second routing via hole and a third routing via hole of "routing connection of coil group between layer 2 and layer 3", "routing connection of coil group between layer 3 and layer 4", "routing connection of coil group between layer 4 and layer 5".
As shown in fig. 7b, the first, second, and third routing vias passing through the metal reference layer may be provided with a same accommodating hole (i.e., the above-mentioned first, second, or third accommodating hole), and the accommodating hole may accommodate the first, second, and third routing vias at the same time. Or a corresponding accommodating hole can be arranged for each routing via hole. The accommodating holes are mutually insulated from the accommodated wiring via holes, and insulation can be realized by dielectric insulation, physical intervals and the like. Therefore, the wires of different coil groups in different coil layers can not be connected together due to contact with the metal reference ground layer, and mutual insulation between the different coil groups is ensured.
The common mode filter is arranged in the manner shown in fig. 7a and 7b, so that the distances between all the coil groups and the first magnetic layer and the second magnetic layer are kept consistent in the same phase, and compared with the common mode filter arranged in the manner that a metal reference ground layer is not added (i.e. the manner corresponding to fig. 3a, 3b, 4 and the like) in fig. 2a and 2b, and the like, by arranging at least one metal reference ground layer, the common mode filter has similar ground impedance between different coil groups, further improves the symmetry between different coil groups, and reduces the longitudinal transfer loss of the common mode filter.
In a possible implementation manner, when the metal reference ground layer is multiple, multiple metal reference ground layers are connected together through ground reference vias, the ground reference vias are disposed in one or more of the first coil layer, the second coil layer and the intermediate coil layer, and the number of the ground reference vias may be 1 or more.
In this implementation, fig. 7c shows a schematic structural diagram of a common-mode filter according to an embodiment of the present application. The common mode filter shown in fig. 7c is different from the common mode filters shown in fig. 7b and 7a in that a reference ground via 212 is provided in the coil layer in the common mode filter shown in fig. 7 c. The number and size of the ground reference vias 212 may be set as required, and the present application is not limited thereto. The difference of the impedance to the ground between different coil groups can be further reduced on the basis of the common mode filters shown in fig. 7b and 7a by arranging the reference ground via hole.
In this implementation, the metal reference formation has spatial dimensions such as thickness, length, width, and the like, and the thickness, the length, and the width of the metal reference formation may be set according to the index parameters of the limit of the machining process, longitudinal transfer loss, differential mode loss, return loss, impedance, and the like, and the metal reference formation is represented by only "surface" to more clearly illustrate the position of the metal reference formation in fig. 7b and 7c, and the thickness of the metal reference formation is not shown.
Fig. 8a shows a schematic structural diagram of a common mode filter according to an embodiment of the present application. Fig. 8b is a cross-sectional view of a common mode filter according to an embodiment of the present application, and fig. 8b is a cross-sectional view taken along a position where a dashed box area s4 is located in fig. 1g, and only a portion related to a coil group is shown in the cross-sectional view fig. 8b for facilitating understanding of a routing layout of the coil group in the present application. In one possible implementation, as shown in fig. 8a and 8b, the common mode filter may further include a third magnetic layer 13 and a fourth magnetic layer 14 parallel to each other. The first coil layer 21, the intermediate coil layer 23, and the second coil layer 22 are located between the third magnetic layer 13 and the fourth magnetic layer 14, and the third magnetic layer 13 is perpendicular to the first magnetic layer 11 and the second magnetic layer 12, respectively, and the fourth magnetic layer 14 is perpendicular to the first magnetic layer 11 and the second magnetic layer 12, respectively.
In this implementation, the fourth magnetic layer and the third magnetic layer are spatially arranged to have a thickness, a length, a width, and the like, and the thickness, the length, and the width of the fifth magnetic layer and the sixth magnetic layer may be set according to the process limitation, the longitudinal transfer loss, the differential mode loss, the return loss, the index parameters of the impedance, and the like, and the third magnetic layer and the fourth magnetic layer are shown as "faces" in fig. 8a to more clearly illustrate the positions of the third magnetic layer and the fourth magnetic layer, and the thicknesses thereof are not shown. The material of the fourth magnetic layer and the third magnetic layer may be a magnetic material such as ferrite, and the material of the third magnetic layer and the fourth magnetic layer may be the same as or different from the material of the first magnetic layer and the second magnetic layer, which is not limited in this application.
The common mode filters are arranged in the manner of fig. 8a and 8b, so that the distances between all the coil sets and the first magnetic layer, the second magnetic layer, the third magnetic layer and the fourth magnetic layer are respectively kept consistent in the same phase, and compared with the common mode filter arranged in the manner of arranging only the first magnetic layer and the second magnetic layer (as exemplified in fig. 2 a-2 b and 4) in fig. 1h and the like, a plurality of coil sets can be in the same magnetic environment in two dimensions, the symmetry between different coil sets is further improved, and the longitudinal transfer loss of the common mode filter is reduced.
Fig. 9a shows a schematic structural diagram of a common mode filter according to an embodiment of the present application. Fig. 9b is a cross-sectional view of a common mode filter according to an embodiment of the present application, and fig. 9b is a cross-sectional view taken along a position where a dashed box area s2 is located in fig. 1e, and only a portion related to a coil group is shown in the cross-sectional view 9b for facilitating understanding of a routing layout of the coil group in the present application. In one possible implementation, as shown in fig. 9a and 9b, the common mode filter may further include a fifth magnetic layer 15 and a sixth magnetic layer 16 that are parallel to each other when the third magnetic layer 13 and the fourth magnetic layer 14 are parallel to each other. The first coil layer 21, the intermediate coil layer 23, and the second coil layer 22 are located between the fifth magnetic layer 15 and the sixth magnetic layer 16, and the fifth magnetic layer 15 is perpendicular to the first magnetic layer 11, the second magnetic layer 12, the third magnetic layer 13, and the fourth magnetic layer 14, respectively, and the sixth magnetic layer 16 is perpendicular to the first magnetic layer 11, the second magnetic layer 12, the third magnetic layer 13, and the fourth magnetic layer 14, respectively.
In this implementation, the fifth magnetic layer and the sixth magnetic layer are provided with spatial dimensions such as thickness, length, and width, and the thickness, length, and width of the fifth magnetic layer and the sixth magnetic layer may be set according to the process limitation, longitudinal transfer loss, differential mode loss, return loss, index parameters of impedance, and the like, and fig. 9a shows the fifth magnetic layer and the sixth magnetic layer as "faces" to more clearly illustrate the positions of the fifth magnetic layer and the sixth magnetic layer, and the thicknesses thereof are not shown. The materials of the fifth magnetic layer and the sixth magnetic layer may be magnetic materials such as ferrite, and the materials of the fifth magnetic layer and the sixth magnetic layer may be the same as or different from the materials of the first magnetic layer, the second magnetic layer, and the third magnetic layer, and the fourth magnetic layer, which is not limited in this application.
In this implementation manner, the leading-out vias of the electrodes of the common mode filter may be disposed in the first magnetic layer, the second magnetic layer, the third magnetic layer, the fourth magnetic layer, the fifth magnetic layer, and the sixth magnetic layer, so as to facilitate assembly and electrical connection of the common mode filter in a circuit system, and a person skilled in the art may set the positions, sizes, and the like of the leading-out vias as needed, which is not limited in this application.
The common mode filter is arranged in the manner of fig. 9a and 9b, so that the distances between all the coil groups and the first magnetic layer, the second magnetic layer, the third magnetic layer, the fourth magnetic layer, the fifth magnetic layer and the sixth magnetic layer are respectively kept consistent under the same phase, and compared with the common mode filter arranged by only arranging the first magnetic layer and the second magnetic layer (as exemplified in fig. 2 a-2 b, 4 and the like) in the manner of fig. 1h and the like, a plurality of coil groups can be in the same magnetic environment in a three-dimensional space, the symmetry between different coil groups is further improved, and the longitudinal transfer loss of the common mode filter is reduced.
In one possible implementation, the ground reference structure may include a metal ground reference cladding layer, and the metal ground reference cladding layer is clad on the surface of the common mode filter. A metal reference ground cladding layer is used to clad the components included in the common mode filter above. The common mode filter is arranged by adding the metal reference ground cladding layer, so that the distances between all the coil groups and the magnetic layer are respectively kept consistent under the same phase, and compared with the common mode filter arranged in a mode without the metal reference ground cladding layer (such as the examples of fig. 2 a-2 b, 4 and the like) in fig. 1h and the like, a plurality of coil groups can be in the same reference ground environment in a three-dimensional space, the ground impedance is consistent, the symmetry among different coil groups is further improved, and the longitudinal transfer loss of the common mode filter is reduced.
For example, fig. 10a shows a schematic structural diagram of a common mode filter according to an embodiment of the present application. Fig. 10b is a cross-sectional view of the common mode filter according to an embodiment of the present application, and fig. 10b is a cross-sectional view taken along a position where a dashed box area s2 in fig. 1e (or a dashed box area s4 in fig. 1 g) is located, and only a portion related to the coil assembly is shown in the cross-sectional view 10b for facilitating understanding of the routing layout of the coil assembly in the present application. In one possible implementation, as shown in fig. 10a and 10b, the metal reference ground cladding layer 71 is used to clad the first magnetic layer 11, the second magnetic layer 12 and the plurality of coil layers.
Fig. 11a shows a schematic structural diagram of a common mode filter according to an embodiment of the present application. Fig. 11b is a cross-sectional view of a common mode filter according to an embodiment of the present application, and fig. 11b is a cross-sectional view taken along a position where a dashed box area s2 is located in fig. 1e, and only a portion related to a coil assembly is shown in the cross-sectional view 11b for facilitating understanding of a routing layout of the coil assembly in the present application. In one possible implementation, as shown in fig. 11a and 11b, the metal reference ground cladding layer 71 is used to clad the first magnetic layer 11, the second magnetic layer 12, the third magnetic layer 13, the fourth magnetic layer 14, the fifth magnetic layer 15, the sixth magnetic layer 16, and the plurality of coil layers.
In this implementation, when the reference ground structure includes portions of the metal reference ground layer, the first auxiliary layer, the second auxiliary layer, and the like, these portions also need to be covered by the metal reference ground covering layer 71.
In this implementation, the metal reference ground cladding layer, the first magnetic layer 11, the second magnetic layer 12, the third magnetic layer 13, the fourth magnetic layer 14, the fifth magnetic layer 15, and the sixth magnetic layer 16 may be provided with lead-out via holes of common mode filter electrodes, so as to facilitate assembly and electrical connection of the common mode filter in a circuit system, and a person skilled in the art may set positions, sizes, and the like of the lead-out via holes as needed, which is not limited in this application.
In this implementation, the metal reference ground cladding layer has a thickness, and the thickness of the metal reference ground cladding layer may be set according to the process limitation, the longitudinal transfer loss, the differential mode loss, the return loss, the index parameters of the impedance, and the like, which is not limited in this application.
Fig. 12a shows a perspective view of a common mode filter according to an embodiment of the present application, and fig. 12b shows a front view of the common mode filter according to an embodiment of the present application. Figure 12c shows a side view of a common mode filter according to an embodiment of the present application. Figure 12d shows a top view of a common mode filter according to an embodiment of the present application. Fig. 13a shows a perspective view of a common mode filter according to an embodiment of the present application, and fig. 13b shows a front view of a common mode filter according to an embodiment of the present application. Figure 13c shows a side view of a common mode filter according to an embodiment of the present application. Figure 13d shows a top view of a common mode filter according to an embodiment of the present application. In one possible implementation, as shown in fig. 12 a-12 d, and 13 a-13 d, the ground reference structure may further include a pad(s) 81 and a metal ground reference strip 91 on the surface of the common mode filter, respectively connected to the terminals of each coil group. The terminal of each coil group is connected with the two ends of the wire in the first coil layer, and the terminal of each coil group is connected with the wire in the same coil group in the second coil layer. If one of the two ends of the first wire in the first coil layer in the first coil group, which is not connected with the first wire in the middle coil layer, is a terminal of the first coil group; one end of the two ends of the first wire in the second coil layer in the first coil group, which is not connected with the first wire in the middle coil layer, is the other terminal of the first coil group.
A portion of each pad 81 is located at a first side of the common mode filter (i.e. the bottom surface of the common mode filter in fig. 12 a-12 d, 13 a-13 d), another portion of each pad 81 is located at one of a plurality of second sides of the common mode filter connected to the first side (i.e. the sides connected to the bottom surface of the common mode filter in fig. 12 a-12 d, 13 a-13 d), and the metal reference ground strip 91 is located between the pads 81 and surrounds at least a partial area of the first side and the second side with pads of the common mode filter.
In this implementation, as shown in fig. 12a to 12d and fig. 13a to 13d, it is assumed that the common mode filter has 3 coil groups and 6 pads 81, each of the 6 pads 81 has a portion located on a bottom surface (i.e., a first side surface) of the common mode filter, another portion of three pads 81 (hereinafter, referred to as a first group of pads) of the 6 pads 81 is located on a front side surface (i.e., a second side surface) of the common mode filter connected to the bottom surface, and another portion of another three pads 81 (hereinafter, referred to as a second group of pads) of the 6 pads 81 is located on a rear side surface (i.e., a second side surface) of the common mode filter connected to the bottom surface. As shown in fig. 12 a-12 d, the metal reference ground strip 91 may be only located between the first set of pads and the second set of pads, that is, a portion of the metal reference ground strip 91 is in the middle area of the first side and passes through the first set of pads and the second set of pads, the other portions of the metal reference ground strip 91 are respectively located on the left side and the right side of the common mode filter, and the height of the portions of the metal reference ground strip 91 on the left side and the right side is at least equal to the height of the pads 81 on the front side and the rear side, so as to ensure that each pad can use the metal reference ground strip as a reference ground. As shown in fig. 13 a-13 d, the metal reference ground strip 91 extends around the common mode filter to ensure that each pad can use the metal reference ground strip as a reference ground, based on fig. 12 a-12 d.
In this implementation, the metal reference ground strip has a thickness and a width, and the thickness of the metal reference ground cladding layer may be set according to the limitation of the processing technology, the longitudinal transfer loss, the differential mode loss, the return loss, the index parameters of the impedance, and the like, which is not limited in this application.
The common mode filter is arranged in the manner of fig. 12a to 12d and fig. 13a to 13d, so that the distances between all the coil groups and the magnetic layer are respectively kept consistent in the same phase, and compared with the common mode filter arranged in the manner of fig. 1h, different coil groups have similar ground impedance at the position of the bonding pad, the symmetry between different coil groups is further improved, and the longitudinal transfer loss of the common mode filter is reduced.
Fig. 14a shows a cross-sectional view of a common mode filter according to an embodiment of the present application, and fig. 14b shows a schematic diagram of a plurality of coil layers of the common mode filter according to an embodiment of the present application. Fig. 14a is a cross-sectional view taken along the position of the dashed box area s3 in fig. 1f, and only the portion related to the coil assembly is shown in the cross-sectional view of fig. 14a for facilitating the understanding of the routing layout of the coil assembly in the present application. In one possible implementation, the common mode filter shown in fig. 14a and 14b is different from the common mode filter shown in fig. 2a to 2b, fig. 3a to 3b, fig. 4, fig. 5a to 5b, fig. 6a to 6c, fig. 7a to 7c, fig. 8a to 8b, fig. 9a to 9b, fig. 10a to 10b, fig. 11a to 11b, fig. 12a to 12D, and fig. 13a to 13D in that the common mode filter shown in fig. 14a and 14b includes 4 coil sets, the plurality of coil sets further includes a fourth coil set D, the plurality of via holes further includes a fourth via hole (not shown in the figure, see fig. 2b and the related text description), and each of the first coil set D includes the fourth D in the first coil layer 21, A fourth trace d in the second coil layer 22 and a fourth trace d in the intermediate coil layer 23. The plurality of wires of the fourth coil group D are connected together through the fourth wire via holes, and the first wire a, the second wire b, the third wire c and the fourth wire D in the same coil layer are wound in parallel.
As shown in fig. 14b, in each coil layer, the traces marked as "a", "b", "c", and "d" are respectively the first trace, the second trace, the third trace, and the fourth trace of the coil layer where the traces are located, that is, the first trace is "a", the second trace is "b", the third trace is "c", and the fourth trace is "d". The plurality of traces of the first coil group a are traces marked as "a" in the first coil layer "1 st layer", the plurality of intermediate coil layers "2 nd to 5 th layers", and the second coil layer "6 th layer". The plurality of traces of the second coil group B are the traces marked as "B" in the first coil layer "1 st layer", the plurality of intermediate coil layers "2 nd to 5 th layers", and the second coil layer "6 th layer". The plurality of traces of the third coil group C are the traces marked as "C" in the first coil layer "1 st layer", the plurality of intermediate coil layers "2 nd to 5 th layer", and the second coil layer "6 th layer". The plurality of traces of the fourth coil group D are the traces marked as "D" in the first coil layer "layer 1", the plurality of intermediate coil layers "layer 2 to layer 5", and the second coil layer "layer 6".
In this implementation, the common mode filter shown in fig. 14a and 14b may be referred to adjust 4 coil groups, add other portions (such as a metal reference ground covering layer, etc.), and adjust the layout of the traces in each coil layer, which is not limited in this application. The number of the coil groups, the thickness and the width of the wires of the coil groups and the wire spacing can be set according to the requirements of devices, the limitation of processing technology and the like, and the method is not limited in the application.
The common mode filters are arranged in the manner of fig. 14a and 14b, so that the distances between all coil groups and the magnetic layer are respectively kept consistent in the same phase, and compared with the common mode filter arranged in the manner of only three coil groups (as in the examples of fig. 2a to 2b, 4 and the like) in fig. 1h and the like, the number of the coil groups in the common mode filter is increased, meanwhile, the symmetry between different coil groups is improved, and the longitudinal transfer loss of the common mode filter is reduced.
Having described embodiments of the present application, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The embodiments and features of the embodiments of the present application may be combined with each other without conflict. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (19)
1. A common mode filter, comprising: the coil comprises a plurality of coil groups, a plurality of routing through holes, a first magnetic layer, a second magnetic layer and a plurality of coil layers which are parallel to each other, wherein the plurality of coil groups at least comprise a first coil group, a second coil group and a third coil group;
the first coil layer, the intermediate coil layer and the second coil layer are sequentially stacked between the first magnetic layer and the second magnetic layer;
the first coil group comprises a first trace in each of the coil layers, the second coil group comprises a second trace in each of the coil layers, and the third coil group comprises a third trace in each of the coil layers;
the first trace via hole is used for connecting a plurality of first traces of the first coil group together, the second trace via hole is used for connecting a plurality of second traces of the second coil group together, and the third trace via hole is used for connecting a plurality of third traces of the third coil group together;
at least two of the first wire, the second wire and the third wire in the same coil layer are wound in parallel.
2. A common-mode filter, comprising: the coil comprises a plurality of coil groups, a plurality of routing through holes, and a first magnetic layer, a second magnetic layer and a plurality of coil layers which are parallel to each other, wherein the plurality of coil groups at least comprise a first coil group, a second coil group and a third coil group, the plurality of routing through holes at least comprise a first routing through hole, a second routing through hole and a third routing through hole, the plurality of coil layers comprise a first coil layer, at least one middle coil layer and a second coil layer, each coil layer is at least provided with a first routing, a second routing and a third routing,
the first coil layer, the middle coil layer and the second coil layer are sequentially arranged between the first magnetic layer and the second magnetic layer; the first coil group comprises a first trace in each coil layer, the second coil group comprises a second trace in each coil layer, and the third coil group comprises a third trace in each coil layer;
the first trace via hole is used for connecting a plurality of first traces of the first coil group together, the second trace via hole is used for connecting a plurality of second traces of the second coil group together, and the third trace via hole is used for connecting a plurality of third traces of the third coil group together;
at least two of the first wire, the second wire and the third wire in the same coil layer are wound in parallel, and the width of the same coil group meets any one of the following conditions:
the width of the first wire and the width of the second wire are both the width of the first wire, the width of the third wire is the width of the second wire, and the width of the first wire is different from the width of the second wire; or,
the width of the first wire, the width of the second wire and the width of the third wire are different, wherein the width of the first wire is the width of the first wire, and the width of the second wire is the width of the second wire.
3. A common-mode filter according to claim 2,
the first trace width and the second trace width satisfy:
w1 is p1 xW 2, W1 is the first trace width, W2 is the second trace width, and p1 is a proportionality coefficient, wherein p1 is E [0.5,0.8] or p 1E [2,3 ].
4. The common mode filter according to any one of claims 1 to 3, wherein the first trace, the second trace and the third trace in the first coil layer have a first relative positional relationship therebetween, the first trace, the second trace and the third trace in the second coil layer have a second relative positional relationship therebetween, the first trace, the second trace and the third trace in the intermediate coil layer have an intermediate relative positional relationship therebetween,
the first relative position relationship, the second relative position relationship and the middle relative position relationship are the same, and the center lines of the first routing via hole connected with the first routing, the second routing via hole connected with the second routing and the third routing via hole connected with the third routing in the adjacent coil layers are all located on the same cross section perpendicular to each coil layer.
5. A common-mode filter according to any one of claims 1 to 3,
the first wire, the second wire and the third wire in the first coil layer have a first relative position relationship, the first wire, the second wire and the third wire in the second coil layer have a second relative position relationship, the first wire, the second wire and the third wire in the middle coil layer have a middle relative position relationship,
the first relative position relationship, the second relative position relationship and the middle relative position relationship are the same, and the sum of the first lengths of the first wires of the first coil group, the sum of the second lengths of the second wires of the second coil group and the sum of the third lengths of the third wires of the third coil group are the same.
6. The common mode filter according to any one of claims 1 to 3, wherein the first trace, the second trace and the third trace in the first coil layer have a first relative positional relationship therebetween, the first trace, the second trace and the third trace in the second coil layer have a second relative positional relationship therebetween, the first trace, the second trace and the third trace in the intermediate coil layer have an intermediate relative positional relationship therebetween,
the first relative position relationship, the second relative position relationship and the middle relative position relationship are not consistent, and the sum of the first lengths of the first wires of the first coil group, the sum of the second lengths of the second wires of the second coil group and the sum of the third lengths of the third wires of the third coil group are the same.
7. A common-mode filter according to any one of claims 1 to 6, characterized in that the common-mode filter further comprises at least one ground reference structure, the ground reference structure is insulated from each first trace, each second trace and each third trace, and the ground reference structure is insulated from the first magnetic layer and the second magnetic layer.
8. A common-mode filter according to claim 7, characterized in that the ground reference structure comprises a first auxiliary layer and a second auxiliary layer,
the first auxiliary layer is positioned between the first coil layer and the first magnetic layer, and first reference ground wires corresponding to a first wire, a second wire and a third wire in the first coil layer are arranged in the first auxiliary layer;
the second auxiliary layer is located between the second coil layer and the second magnetic layer, and second reference ground wires corresponding to the first wire, the second wire and the third wire in the second coil layer are arranged in the second auxiliary layer.
9. A common-mode filter according to claim 6 or 7, characterized in that the ground reference structure comprises: a first companion ground reference line, an intermediate companion ground reference line and a second companion ground reference line,
the first coil layer is provided with a first accompanying reference ground wire of one or more first target wires of the first wire, the second wire and the third wire of the first coil layer, and the first accompanying reference ground wire is positioned at one side or two sides of the first target wires;
the middle coil layer is provided with a middle accompanying reference ground wire of one or more middle target wires in the first wire, the second wire and the third wire of the middle coil layer, and the middle accompanying reference ground wire is positioned at one side or two sides of the middle target wires;
the second coil layer is provided with a second accompanying reference ground wire of one or more second target wires of the first wire, the second wire and the third wire of the second coil layer, and the second accompanying reference ground wire is positioned on one side or two sides of the second target wires.
10. A common-mode filter according to claim 9, characterized in that the first, intermediate and second companion ground reference lines are connected together.
11. A common-mode filter according to any one of claims 7 to 10, characterized in that the reference ground structure comprises at least one of the following metal reference ground layers:
a first metal reference ground layer between the first coil layer and the first magnetic layer;
a second metal reference ground layer between the second coil layer and the second magnetic layer;
the third metal reference stratum is positioned between the first coil layer and the middle coil layer and is provided with a first accommodating hole for accommodating a first routing through hole, a second routing through hole and a third routing through hole which pass through the third metal reference stratum;
the fourth metal reference stratum is positioned between the second coil layer and the middle coil layer and is provided with a first routing through hole, a second routing through hole and a second containing hole for containing the third routing through hole which pass through the third metal reference stratum;
the middle metal reference stratum comprises one or more middle metal reference stratums, each middle metal reference stratum is located between two middle coil layers and is provided with a first routing through hole, a second routing through hole and a third containing hole, and the first routing through hole, the second routing through hole and the third routing through hole penetrate through the third metal reference stratum.
12. A common-mode filter according to claim 11, wherein when the metal reference ground layer is plural, plural metal reference ground layers are connected together by a ground reference via provided in one or more of the first coil layer, the second coil layer and the intermediate coil layer.
13. A common-mode filter according to any one of claims 1 to 12, characterized in that the common-mode filter further comprises a third magnetic layer and a fourth magnetic layer parallel to each other,
the first coil layer, the middle coil layer and the second coil layer are located between the third magnetic layer and the fourth magnetic layer, the third magnetic layer is perpendicular to the first magnetic layer and the second magnetic layer respectively, and the fourth magnetic layer is perpendicular to the first magnetic layer and the second magnetic layer respectively.
14. A common-mode filter according to claim 13, characterized in that the common-mode filter further comprises a fifth magnetic layer and a sixth magnetic layer parallel to each other,
the first coil layer, the middle coil layer and the second coil layer are located between the fifth magnetic layer and the sixth magnetic layer, the fifth magnetic layer is perpendicular to the first magnetic layer, the second magnetic layer, the third magnetic layer and the fourth magnetic layer respectively, and the sixth magnetic layer is perpendicular to the first magnetic layer, the second magnetic layer, the third magnetic layer and the fourth magnetic layer respectively.
15. A common-mode filter according to any of claims 7 to 14, characterized in that the ground reference structure comprises a metal ground reference cladding layer, which metal ground reference cladding layer is cladded at the surface of the common-mode filter.
16. A common-mode filter according to any one of claims 7 to 14, characterized in that the ground reference structure comprises a pad and a metal ground reference strip respectively connected to the terminals of each coil group,
a part of each bonding pad is positioned on a first side face of the common mode filter, and the other part of each bonding pad is positioned on one of a plurality of second side faces connected with the first side face on the common mode filter;
the metal reference ground strip is positioned between the pads and surrounds at least partial areas of the first side and the second side with the pads of the common mode filter.
17. A common-mode filter according to any one of claims 1 to 3, characterized in that the plurality of coil groups further include a fourth coil group, the plurality of routing vias further include a fourth routing via, each coil layer is further provided with a fourth routing, the fourth coil group includes a fourth routing in each coil layer, the plurality of fourth routing of the fourth coil group are connected together through the fourth routing via, and at least two of the first routing, the second routing, the third routing and the fourth routing in the same coil layer are wound in parallel.
18. A common-mode filter according to any one of claims 1 to 17, wherein the first trace, the second trace and the third trace in the same coil layer are separated by a dielectric, and different coil layers are separated by the dielectric.
19. A common-mode filter according to claim 18, characterized in that the material of the dielectric is ceramic material, and the material of the coil assembly and the trace via is metal material.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011311813.4A CN114520089A (en) | 2020-11-20 | 2020-11-20 | Common mode filter and terminal equipment |
| JP2023530507A JP2023550450A (en) | 2020-11-20 | 2021-11-18 | Common mode filters and terminal devices |
| EP21893969.2A EP4227966A4 (en) | 2020-11-20 | 2021-11-18 | Common-mode filter and terminal device |
| PCT/CN2021/131422 WO2022105822A1 (en) | 2020-11-20 | 2021-11-18 | Common-mode filter and terminal device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011311813.4A CN114520089A (en) | 2020-11-20 | 2020-11-20 | Common mode filter and terminal equipment |
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| CN114520089A true CN114520089A (en) | 2022-05-20 |
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| EP (1) | EP4227966A4 (en) |
| JP (1) | JP2023550450A (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2023550450A (en) | 2023-12-01 |
| WO2022105822A1 (en) | 2022-05-27 |
| EP4227966A1 (en) | 2023-08-16 |
| EP4227966A4 (en) | 2024-08-07 |
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