CN109585123B

CN109585123B - Common-mode inductor and production process thereof

Info

Publication number: CN109585123B
Application number: CN201910007548.1A
Authority: CN
Inventors: 王晋
Original assignee: Mianyang Weicheng Technology Co ltd
Current assignee: Mianyang Weicheng Technology Co ltd
Priority date: 2019-01-04
Filing date: 2019-01-04
Publication date: 2021-01-26
Anticipated expiration: 2039-01-04
Also published as: CN109585123A; WO2020140307A1

Abstract

The invention discloses a common mode inductor and a production process thereof, wherein the common mode inductor comprises an integrally formed magnet and a coil group for transmitting signals, wherein the magnet is formed by baking, curing and molding magnetic powder; the coil assembly is wrapped inside the magnet. The common mode inductor has the advantages of small volume, simple structure, convenient manufacture and good shielding and inhibiting effects.

Description

Common-mode inductor and production process thereof

Technical Field

The invention relates to the technical field of inductors, in particular to a common-mode inductor and a production process thereof.

Background

Common mode inductors (also called Common mode chokes) are commonly used in switching power supplies of computers to filter and shield Common mode electromagnetic interference signals. Meanwhile, in the design of the board card, the common mode inductor also plays a role in EMI filtering and is used for inhibiting electromagnetic waves generated by the high-speed signal line from radiating and emitting outwards.

But the shielding and suppression effects of the existing common mode inductor are poor.

Disclosure of Invention

The present invention is directed to overcome the drawbacks of the prior art, and provides a common mode inductor and a manufacturing process thereof, so as to solve the problems of the prior art.

To solve the above problems, the present invention provides: a common mode inductor comprises an integrally formed magnet and a coil group used for transmitting signals, wherein the magnet is formed by baking and curing magnetic powder;

the coil assembly is wrapped inside the magnet.

As a further improvement of the above technical solution, the coil assembly includes a first coil and a second coil wound in parallel, and the first coil and the second coil each include a head end and a tail end.

As a further improvement of the above technical solution, the first coil and the second coil are both hollow coils, and the magnet includes a core portion filling the inside of the first coil and the second coil.

As a further improvement of the above technical solution, the first coil and the second coil are both formed by winding round wires.

As a further improvement of the above technical solution, the first coil and the second coil are both formed by winding flat wires.

As a further improvement of the above technical solution, the magnetic field generator further comprises a guide vane, wherein the guide vane is partially wrapped by the magnet;

the conducting sheet is provided with an electrode group, and the electrode group comprises electrodes which correspond to the end parts of the coil group one by one;

the electrode is electrically connected with the end part, and the electrode part is positioned outside the magnet.

As a further improvement of the above solution, the electrode is welded to the end portion.

As a further improvement of the technical scheme, the guide sheet is a copper sheet.

As a further improvement of the above technical solution, the magnet has a rectangular parallelepiped shape.

The invention also provides: a production process of a common mode inductor for producing the common mode inductor as described in any one of the above, comprising: obtaining a coil group through winding; placing the coil assembly in a mold; filling magnetic powder into the mold, and performing compression molding on the magnetic powder to obtain a magnet; baking the magnet to cure the magnet.

The invention has the beneficial effects that: the invention provides a common mode inductor which comprises a magnet and a coil group, wherein the magnet is integrally formed, the coil group is used for transmitting signals, the magnet is formed by baking and curing magnetic powder, and the coil group is wrapped inside the magnet. Therefore, the magnet can shield the interference of external signals to the coil assembly and can inhibit the electromagnetic waves generated by the coil assembly from radiating and emitting outwards.

The common mode inductor has the advantages of small volume, simple structure, convenient manufacture and good shielding and inhibiting effects.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below. It is appreciated that the following drawings depict only some embodiments of the invention and are therefore not to be considered limiting of its scope, for those skilled in the art will be able to derive additional related drawings therefrom without the benefit of the inventive faculty.

FIG. 1 is a diagram of a common mode inductor according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a coil assembly according to an embodiment of the present invention;

FIG. 3 is a schematic view of a guide plate according to an embodiment of the present invention;

FIG. 4 is a partial enlarged view taken along line A in FIG. 3;

fig. 5 is a flowchart of a manufacturing process of a common mode inductor according to embodiment 2 of the present invention.

Description of the main element symbols:

1-a magnet; 2-coil assembly; 3-a first coil; 4-a second coil; 5-a guide sheet; 6-electrode group; 7-electrodes.

Detailed Description

Various embodiments of the present invention will be described more fully hereinafter. The invention is capable of various embodiments and of modifications and variations therein. However, it should be understood that: there is no intention to limit various embodiments of the invention to the specific embodiments disclosed herein, but on the contrary, the intention is to cover all modifications, equivalents, and/or alternatives falling within the spirit and scope of various embodiments of the invention.

Hereinafter, the terms "includes" or "may include" used in various embodiments of the present invention indicate the presence of the disclosed functions, operations, or elements, and do not limit the addition of one or more functions, operations, or elements. Furthermore, as used in various embodiments of the present invention, the terms "comprises," "comprising," "includes," "including," "has," "having" and their derivatives are intended to mean that the specified features, numbers, steps, operations, elements, components, or combinations of the foregoing, are only meant to indicate that a particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as first excluding the existence of, or adding to the possibility of, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.

In various embodiments of the invention, the expression "a or/and B" includes any or all combinations of the words listed simultaneously, e.g., may include a, may include B, or may include both a and B.

Expressions (such as "first", "second", and the like) used in various embodiments of the present invention may modify various constituent elements in various embodiments, but may not limit the respective constituent elements. For example, the above description does not limit the order and/or importance of the elements described. The foregoing description is for the purpose of distinguishing one element from another. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present invention.

It should be noted that: in the present invention, unless otherwise explicitly specified or defined, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be directly connected or indirectly connected through intervening media; there may be communication between the interiors of the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, it should be understood by those skilled in the art that the terms indicating an orientation or a positional relationship herein are based on the orientations and the positional relationships shown in the drawings and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation and operate, and thus, should not be construed as limiting the present invention.

The terminology used in the various embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the invention. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.

Example 1

Referring to fig. 1 and 2, in the present embodiment, a common mode inductor is provided, which includes a magnet 1 and a coil assembly 2 for transmitting signals, wherein the magnet 1 may be formed by baking and curing magnetic powder.

The coil assembly 2 is wrapped inside the magnet 1, and in particular, the magnet 1 completely wraps the coil assembly 2.

The common mode inductor has the advantages of small volume, simple structure, convenient manufacture and good shielding and inhibiting effects. The magnet 1 can shield the interference of external signals to the coil assembly 2, and can inhibit the electromagnetic waves generated by the coil assembly 2 from radiating and emitting outwards.

The common mode inductor has excellent high-frequency and EMI suppression effects, and can save the number of EMI suppression components used in the design of a complete machine (such as a power supply), thereby reducing the cost of the complete machine.

EMI is called Electromagnetic Interference, Chinese is Electromagnetic Interference, and the interpretation is Electromagnetic Interference. EMI is an interference phenomenon generated after electromagnetic waves and electronic components act, and includes two types of interference, namely conduction interference and radiation interference. Conducted interference refers to coupling (interfering) a signal on one electrical network to another electrical network through a conductive medium. The radiation interference means that an interference source couples (interferes) signals to another electric network through space, and in the design of a high-speed PCB and a system, a high-frequency signal line, pins of an integrated circuit, various connectors and the like can be radiation interference sources with antenna characteristics and can emit electromagnetic waves and influence the normal work of other systems or other subsystems in the system.

Because the magnet 1 is integrally formed, the magnet 1 does not need to be assembled and spliced during production, so that the size can be reduced conveniently, production procedures can be reduced, and the production cost can be reduced.

Wherein, the magnet 1 can be arranged in a cuboid shape. In particular, the magnet 1 may also be provided in other shapes.

In the present embodiment, the coil assembly 2 may include a first coil 3 and a second coil 4 wound in parallel, and each of the first coil 3 and the second coil 4 includes two end portions, as known, each coil assembly 2 includes four end portions.

In production, the double-wound parallel winding of the first coil 3 and the second coil 4 may be achieved by a winding device to obtain the coil assembly 2. Specifically, the first coil 3 and the second coil 4 may be wound on the side wall of the same cylindrical column, so as to obtain the coil assembly 2, wherein the first coil 3 and the second coil 4 are alternately distributed along the axial direction of the column. Referring to fig. 2, in the present embodiment, the left side is two end portions of the first coil 3, the right side is two end portions of the second coil 4, and the middle portion of the first coil 3 and the second coil 4 are alternately distributed, wherein the inside of the middle portion is the inside of the first coil 3 and the second coil 4, and the inside is a hollow structure and has a cylindrical shape.

In this embodiment, both the first coil 3 and the second coil 4 may be formed by winding round wires. In other specific embodiments, the first coil 3 and the second coil 4 may also be wound with flat wires in view of reducing resistance and reducing heat generation.

The first coil 3 and the second coil 4 are both air coils, wherein the magnet 1 includes a core portion filling the inside of the first coil 3 and the second coil 4.

The magnet 1 fills the core inside the first coil 3 and the second coil 4, which can be regarded as an iron core, and after being electrified, the magnet can generate larger magnetic induction intensity, so that the power of the common mode inductor is improved, and the power consumption is reduced.

Due to the existence of the magnet 1, an iron core is not needed, so that the production cost can be reduced. And because the magnet 1 is integrally formed, the production process is simpler.

As shown in fig. 3, in the present embodiment, the common mode inductor may further include a guide plate 5, and the guide plate 5 is partially wrapped by the magnet 1 and is fixedly connected to the magnet 1.

Wherein, the conducting sheet 5 can be provided with an electrode group 6.

As shown in fig. 4, the electrode group 6 includes electrodes 7 corresponding to the end portions of the coil group 2 one by one, and in the present embodiment, each electrode group 6 may include four electrodes 7.

Specifically, the lead 5 may be provided with a plurality of electrode sets 6, and each electrode set 6 corresponds to one coil set 2.

As shown in fig. 3, four electrode groups 6 are disposed on the conductive sheet 5, and four common mode inductors are correspondingly generated.

In the present embodiment, the guide blade 5 may be provided in a rectangular shape. In other embodiments, the shape of the guide vane 5 can be set according to the requirement.

The electrode 7 is electrically connected to the end portion, and the electrode 7 is partially located outside the magnet 1, wherein the portion of the electrode 7 connected to the end portion is located inside the magnet 1.

In the present embodiment, the electrode 7 and the end portion may be welded by a spot welding process.

In this embodiment, the guiding sheet 5 may be a copper sheet. In other embodiments, the guide plate 5 may be made of other conductive materials according to the requirement.

The common mode inductors in the embodiment are wrapped by the closed magnetic loop, have good EMI shielding effect, and have the maximum power and the minimum power consumption in the same size, and the application frequency band can reach 5 MHz.

The common mode inductor provided by the embodiment has the following advantages:

1. the problems of power consumption, overlarge volume, low production efficiency and the like of the traditional common mode inductor used by the conventional power module are effectively solved.

2. The volume is small and exquisite, can reduce the space that occupies in electric appliances such as power, conveniently realizes electronic device's miniaturization.

3. The common mode inductor has good shielding effect, and reduces the use of EMI shielding devices of the whole machine.

Example 2

In order to produce the common mode inductor, in the embodiment, a production process of the common mode inductor is also provided.

The production process of the common mode inductor can comprise the following steps: obtaining a coil group 2 through winding; placing the coil assembly 2 in a mold; filling magnetic powder into the mold, and performing compression molding on the magnetic powder to obtain a magnet 1; the magnet 1 is baked so that the magnet 1 is cured.

As shown in fig. 5, in this embodiment, the production process flow of the common mode inductor is as follows:

and S1, winding. The first coil 3 and the second coil 4 are wound by two wires to obtain the coil assembly 2. Wherein, the first coil 3 and the second coil 4 can be wound by two wires by a winding device, and then the coil assembly 2 is obtained.

And S2, baking the coil. The coil assembly 2 is kept dry by baking.

And S3, welding. The coil assembly 2 is placed on the lead 5 such that the end portions of the first and

second coils

3 and 4 correspond one-to-one to the electrodes 7 on the electrode assembly 6 and spot-welded.

And S4, molding. And (3) placing the coil group 2 in a mould, simultaneously filling magnetic powder into the mould, wrapping the guide plate 5 part by the magnetic powder, simultaneously, locating the guide plate 5 and the electrode 7 part outside the mould, and carrying out compression molding on the magnetic powder to obtain the magnet 1. Specifically, referring to fig. 3 and 4, after the coil assembly 2 is disposed on the electrode assembly 6 in the direction a, the magnetic powder wraps the portion in the direction a.

And S5, forming and baking. The whole body including the guide piece 5, the mold and the magnet 1 is placed in an oven and subjected to wave band temperature control baking, so that the magnet 1 is cured.

And S6, cutting. The mold is disassembled and the portion of the guide piece 5 outside the magnet 1 is cut by a corresponding cutter, thereby obtaining a single independent common mode inductor.

S7, bending and straightening feet. The part of the electrode 7 exposed out of the magnet 1 is bent and the leg is adjusted so as to be smoothly attached to the magnet 1.

And S8, printing. The magnet 1 is printed with the corresponding parameters or model.

And S9, appearance inspection.

And S10, electrical property testing. The performance of the common mode inductor is tested to check whether the shielding and inhibiting performance is qualified.

And S11, packaging.

S12, FQC. FQC refers to Final inspection and verification (Final Quality Control) of the manufacturing process.

And S13, warehousing.

The production process of the common mode inductor provided by the embodiment is simple in process, and can realize production, test and packaging fully automatically.

Those skilled in the art will appreciate that the figures are merely schematic representations of one preferred implementation scenario and that the blocks or flow diagrams in the figures are not necessarily required to practice the present invention.

Those skilled in the art will appreciate that the modules in the devices in the implementation scenario may be distributed in the devices in the implementation scenario according to the description of the implementation scenario, or may be located in one or more devices different from the present implementation scenario with corresponding changes.

The modules of the implementation scenario may be combined into one module, or may be further split into a plurality of sub-modules.

The above example numbers are for description only and do not represent the superiority and inferiority of the implementation scenario.

The above disclosure is only a few specific implementation scenarios of the present invention, however, the present invention is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.

Claims

1. The common mode inductor is characterized by comprising a magnet and a coil group, wherein the magnet is integrally formed, and the coil group is used for transmitting signals, and the magnet is formed by baking and curing magnetic powder;

the coil assembly is wrapped inside the magnet;

the coil group comprises a first coil and a second coil which are wound by double lines in a parallel mode, the first coil and the second coil respectively comprise a head end part and a tail end part, and the first coil and the second coil are alternately distributed along the axial direction of the same cylindrical cylinder;

the common mode inductor further comprises a guide sheet, and the guide sheet is partially wrapped by the magnet;

the guide sheet is provided with a plurality of electrode groups, and the electrode groups correspond to the coil groups one by one;

the electrode group comprises electrodes which correspond to the end parts of the coil group one by one;

2. A common-mode inductor according to claim 1, characterized in that the first coil and the second coil are both air coils, and the magnet comprises a core filling the inside of the first coil and the second coil.

3. A common-mode inductor according to claim 1, characterized in that the first coil and the second coil are both formed by winding round wires.

4. A common-mode inductor according to claim 1, characterized in that the first coil and the second coil are wound by flat wires.

5. A common-mode inductor according to claim 1, characterized in that the electrodes are welded to the ends.

6. A common-mode inductor according to claim 1, characterized in that the conducting strips are copper strips.

7. A common-mode inductor according to claim 1, characterized in that the magnets are cuboid shaped.

8. A production process of a common mode inductor for producing the common mode inductor according to any one of claims 1 to 7, comprising: obtaining a coil group through winding; placing the coil assembly in a mold; filling magnetic powder into the mold, and performing compression molding on the magnetic powder to obtain a magnet; baking the magnet to cure the magnet;