KR102526062B1 - Transformer - Google Patents

Abstract

The present invention relates to a transformer, and more particularly, to a transformer including a primary coil portion composed of a wound conductive wire and a secondary coil portion in which conductive plates are stacked.
A transformer according to an embodiment of the present invention may include a bobbin, a core portion coupled to the bobbin along an outer side of the bobbin, and a plurality of conductive plates inserted into the bobbin and stacked in a thickness direction.

Description

Transformers {TRANSFORMER}

The present invention relates to a transformer including a primary coil unit composed of a wound conductive wire and a secondary coil unit in which conductive plates are laminated.

Various coil parts such as transformers and line filters are mounted in power supplies of electronic devices.

Transformers (transformers) may be included in electronic devices for various purposes. For example, a transformer can be used to perform the function of transferring energy from one circuit to another. In addition, the transformer may be used to perform a step-up or step-down function that changes the size of the voltage. In addition, since only inductive coupling (coupling) is made between the primary and secondary windings, the transformer, which has the feature that no DC path is directly formed, may be used for the purpose of blocking DC and passing AC, or for isolating between two circuits. .

In general, a transformer maintains an insulation distance between a primary coil, a secondary coil, and a core, and uses a bobbin to protect and fix the position of each component. For this function, the material of the bobbin uses polymers such as PET, PBT, and LCP, which have excellent moldability, processability, insulation properties, and impact resistance. However, due to the characteristics of polymers, heat transfer characteristics are significantly inferior to those of metals, which is disadvantageous to heat dissipation of cores or coils where high heat is generated, thereby reducing the efficiency of transformers. Specifically, the current lost in addition to the current consumed during step-up or step-down in the transformer is converted into heat and released from the core and the primary/secondary coil. For example, since a 3kW transformer generates 30W of heat even if a loss is only 1%, heat dissipation performance in a transformer is an important performance indicator along with efficiency.

However, in a transformer, the lower part of the core is generally in contact with the board and the upper part of the core is fixed with a metal bracket, so heat generated in the primary/secondary coil is discharged to the board or bracket via the core. Therefore, the bobbin preferably has a structure in which heat generated in the 1/2 coil can be easily transferred to the core, but the bobbin generally has a shape that mostly surrounds the secondary coil to secure an insulation distance. Therefore, there is a demand for a bobbin capable of improving the heat dissipation performance of the transformer.

The present invention has been devised to solve the problems of the prior art described above, and is to provide a transformer including a bobbin capable of efficient heat dissipation.

In addition, the present invention is to provide a transformer capable of securing fixation between a secondary side coil unit and a core.

The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art from the description below.

In order to solve the above technical problem, the transformer of the present invention according to an embodiment of the present invention is to structurally compensate for the weakness of heat dissipation generated while using a bobbin of a polymer material having good insulating properties.

To this end, a transformer according to an embodiment includes a bobbin; a core part disposed outside the bobbin and exposing a part of the bobbin; and a plurality of conductive plates inserted into the bobbin and stacked in a thickness direction, wherein the bobbin covers a portion of an upper surface of an uppermost conductive plate and a portion of a lower surface of a lowermost conductive plate in a thickness direction among the plurality of conductive plates. Each may have an opening exposing it.

In addition, the transformer according to an embodiment includes a bobbin; a core part disposed outside the bobbin and exposing a part of the bobbin; and a plurality of conductive plates inserted into the bobbin and constituting an upper coil part, a middle coil part, and a lower coil part, respectively, wherein the bobbin includes a lower accommodating part accommodating the lower coil part; a middle accommodating part disposed on the lower accommodating part and accommodating the middle coil part; and an upper accommodating portion disposed on the middle accommodating portion and accommodating the upper coil unit, wherein the upper accommodating portion includes a first protrusion covering at least a portion of an upper surface of an uppermost conductive plate of the upper coil unit, The accommodating part may include a second protrusion covering at least a part of a lower surface of the lowermost conductive plate of the lower coil part.

For example, the bobbin may include an upper connecting portion connecting the upper receiving portion and the middle receiving portion; And it may further include a lower connecting portion connecting the middle accommodating portion and the lower accommodating portion.

For example, the upper receiving portion bottom portion in contact with the top connecting portion; a middle portion forming a sidewall of the upper accommodating portion and extending upward from at least a portion of an upper edge of the bottom portion; and a top portion disposed along an upper surface of the middle portion.

For example, the first protrusion may protrude from the top portion.

For example, outer surfaces of each of the bottom portion, the middle portion, and the top portion may be parallel in a thickness direction.

For example, an upper surface of the top portion may protrude inward from a lower surface in contact with the middle portion on a plane.

For example, an inner surface of the top portion may be formed to be inclined.

For example, the inner surface of the top part and the inner surface of the middle part may form an obtuse angle.

For example, at least a portion of an edge of an upper surface of an uppermost conductive plate of the upper coil unit may be formed to be inclined.

The effects of the transformer according to the present invention are described as follows.

First, heat dissipation performance of the secondary coil is improved while securing an insulation distance between the secondary coil and the primary coil.

Second, according to the present invention, the fixation of the secondary side coil part can be secured while maintaining heat dissipation performance.

The effects obtainable in the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description below. will be.

The accompanying drawings are provided to aid understanding of the present invention, and provide embodiments of the present invention together with a detailed description. However, the technical features of the present invention are not limited to specific drawings, and features disclosed in each drawing may be combined with each other to form a new embodiment.
1 is a perspective view showing an example of a transformer according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view showing an example of a transformer according to an embodiment of the present invention.
Figures 3a to 3j respectively show the shape of the bobbin according to the embodiments of the present invention.
4 shows an example of an external perspective view of a lower core according to an embodiment.
5 shows planar shapes of two types of conductive plates according to an embodiment.
6 is a view for explaining a fastening form between conductive plates according to an embodiment of the present invention.
7 is a cross-sectional view showing an example of a bobbin structure to which a heat dissipation means according to another embodiment of the present invention is applied.

Hereinafter, an apparatus and various methods to which embodiments of the present invention are applied will be described in more detail with reference to the drawings. The suffixes "module" and "unit" for components used in the following description are given or used together in consideration of ease of writing the specification, and do not have meanings or roles that are distinct from each other by themselves.

In the description of the embodiment, in the case of being described as being formed in "upper (above) or lower (below)", "before (front) or after (rear)" of each component, "upper (above) or lower (below)" (below)" and "before (front) or after (rear)" include both formed by direct contact between two components or by placing one or more other components between the two components.

Also, terms such as first, second, A, B, (a), and (b) may be used in describing the components of the present invention. These terms are only used to distinguish the component from other components, and the nature, order, or order of the corresponding component is not limited by the term. When an element is described as being “connected,” “coupled to,” or “connected” to another element, that element is or may be directly connected to the other element, but there is another element between the elements. It will be understood that elements may be “connected”, “coupled” or “connected”.

In addition, terms such as "include", "comprise" or "have" described above mean that the corresponding component may be inherent unless otherwise stated, excluding other components. It should be construed as being able to further include other components. All terms, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs, unless defined otherwise. Commonly used terms, such as terms defined in a dictionary, should be interpreted as consistent with the meaning in the context of the related art, and unless explicitly defined in the present invention, they are not interpreted in an ideal or excessively formal meaning.

Hereinafter, the transformer according to the present embodiment will be described in more detail with reference to the accompanying drawings.

1 is a perspective view showing an example of a transformer 100 according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view showing an example of a transformer according to an embodiment of the present invention.

1 and 2 together, the transformer 100 according to an embodiment of the present invention includes a bobbin 110, a plurality of conductive plates 120 inserted into the bobbin 110, and a plurality of conductive plates 120 ) electrically connected together with a plurality of conductive plates 120 and a plurality of fastening parts 130 integrally constituting the secondary coil part and a core part coupled in a form surrounding at least a part of the outer side of the bobbin 110 ( 140) may be included.

Here, the transformer 100 according to the embodiment may further include a conductive wire that is wound around the bobbin 110 and constitutes the primary coil unit, but is omitted from the drawings in this specification. The primary coil unit (not shown) may be a multiple winding in which a rigid conductor metal, for example, a copper conductive wire is wound several times, or may have a plate shape.

The secondary coil units 120 and 130 may transform and output power signals supplied from the first coil unit (not shown). In FIG. 1 , a total of 16 conductive plates may be stacked in a thickness direction (eg, z-axis direction) in configuring the secondary coil units 120 and 130 . Each conductive plate may correspond to one turn in the secondary coil unit. That is, when 16 conductive plates are applied, the number of turns of the secondary coil part may be 16 turns, but this is an example and more or less conductive plates may be applied, and in this case, the number of turns of the secondary coil part is the number of turns of the conductive plate can be proportional to the purchase of

For example, each of the plurality of conductive plates 120 may be inserted into the bobbin 110 in a direction parallel to the x-axis.

Each of the plurality of conductive plates 120 may be electrically insulated from each other through an insulating material except for electrical connection through the fastening part 130 . For example, an insulating film may be disposed between adjacent conductive plates among the plurality of conductive plates to electrically insulate them from each other. The insulating film may include components such as ketone and polyimide, but is not necessarily limited thereto. The conductive plate 120 may include an upper coil part 121, a middle coil part 123, and a lower coil part 125, and each of the coil parts 121, 123, and 125 may be spaced apart from each other in the thickness direction. there is.

In addition, the plurality of conductive plates 120 may include a conductive metal, such as copper, but are not necessarily limited thereto. For example, the plurality of conductive plates may include aluminum. When aluminum is applied instead of copper, the thickness of the conductive plate may be about 60% thicker than copper, but is not necessarily limited to this thickness ratio.

In the bobbin 110, a conductive wire (not shown) constituting the primary coil unit, a plurality of conductive plates 120 constituting the secondary coil unit, and the core unit 140 are insulated from each other, respectively (120, 140 ) may have a shape suitable for accommodating or fixing at least a portion of the

The bobbin 110 may include an insulating material, for example, a resin material, and may be produced by a molding method. The bobbin 110 according to embodiments of the present invention may have an opening exposing a portion of an upper surface of the uppermost conductive plate in a thickness direction and a portion of a lower surface of a lowermost conductive plate in a thickness direction among the plurality of conductive plates 120 . A more specific shape of the bobbin 110 will be described later with reference to FIGS. 3A to 3I.

The fastening part 130 is in the form of a plurality of metal bars and penetrates one end of each of the conductive plates 120 in the thickness direction (eg, Z-axis direction), but connects each of the conductive plates 120 by a soldering method. can be fixed Of course, depending on the embodiment, the metal bar may be replaced with other fastening members such as bolts, nuts, and washers.

The core part 140 having the characteristics of a magnetic circuit may serve as a passage for magnetic flux. The core unit may include an upper core 141 coupled from an upper side and a lower core 142 coupled from a lower side. The two cores 141 and 142 may have a vertically symmetrical shape or an asymmetrical shape. The core part 140 may include a magnetic material such as iron or ferrite, but is not necessarily limited thereto. The specific shape of the core part 140 will be described later with reference to FIG. 4 .

Figures 3a to 3j respectively show the shape of the bobbin according to the embodiments of the present invention.

First, referring to FIGS. 3A and 3B together, the bobbin 110A according to an embodiment includes an upper accommodating portion 111A, a middle accommodating portion 113, a lower accommodating portion 115A, and an upper accommodating portion ( 111A) may include an upper connection part 112 connecting the middle accommodation part 113, a lower connection part 114 connecting the middle accommodation part 113 and the lower accommodation part 115A, and a winding fixing part 117. there is.

Here, each accommodating portion (111A, 113, 115A) has a “U” shape or a track-type planar shape in which one semicircle is cut out when the winding fixing portion 117 is excluded, and each accommodating portion (111A, 113 , 115A) and the two connecting parts 112 and 114 may be aligned with the through hole TH as the center in a vertical direction on a plane. In addition, the inner surface of each of the connecting parts 112 and 114 may define a side wall of the through hole TH. The through hole TH may have a track-like planar shape, but this is exemplary, and it is sufficient to have a shape corresponding to the planar shape of the midfoot of the core part 140 to be described later.

Each of the accommodating portions 111A, 113, and 115A has an accommodating hole for accommodating the conductive plate 120, and has a semicircular shape in common on the X-Y plane and the other side opposite to the other side where the conductive plate 120 can be inserted. have an opening Here, the upper accommodating portion 111A and the lower accommodating portion 115A have a vertically symmetrical shape in the thickness direction (eg, Z-axis direction), so that the upper accommodating portion 111A is open upward, and the lower accommodating portion ( 111C) is open to the lower side. Therefore, in the upper coil part 121 accommodated in the upper accommodating part 111A, at least a part of the conductive plate positioned at the top is exposed upward, and in the lower coil part 125 accommodated in the lower accommodating part 115A, At least a part of the conductive plate positioned at the lowermost end is exposed downward. Therefore, each of the upper coil unit 121 and the lower coil unit 125 has a large heat dissipation area with respect to at least one surface, so that depending on the location of the exposed surface, it may be exposed to the surrounding air or to be coupled to the core unit 140. It is advantageous for heat dissipation because it can be quickly transferred to the core part 140 when the heat is applied.

Unlike the upper accommodating portion 111A and the lower accommodating portion 115A, the middle accommodating portion 113 may not have openings in the vertical direction except for the hollow TH except for the opening formed in the X-axis direction. This is to secure an insulation distance between the middle coil part 123 to be accommodated in the middle accommodating part 113 and the primary coil part to be wound around the upper connection part 112 and the lower connection part 114 .

A conductive wire (not shown) constituting the primary coil part is connected to the outer surface of the upper connection part 112, the middle accommodating part 113, and the lower accommodating part in the space between the upper accommodating part 111A and the middle accommodating part 130. It may be wound along each outer surface of the lower connection portion 114 in the space between (115A). The winding fixing part 117 includes two holes 117H extending in the thickness direction, and one end and the other end of a conductive wire (not shown) constituting the primary coil part are inserted into each hole 117H, respectively. can be fixed as

Next, with reference to FIG. 3C, the 'A' portion of FIG. 3B will be described in detail.

Referring to FIG. 3C , the upper accommodating portion 111A may include a bottom portion 111A_B, a middle portion 111A_S, and a top portion 111A_T. Outer surfaces of each of the bottom portion 111A_B, the middle portion 111A_S, and the top portion 111A_T may be parallel to each other in the thickness direction.

The middle portion 111A_S has a certain thickness t and height h1, forms a side wall of the upper accommodating portion 111A, and at least partially (eg, excluding the opening in the X-axis direction) on the upper surface of the bottom portion 111A_B. ) extends upward to have a U-shaped planar shape along the edge of the region. The lower surface of the bottom portion 111A_B is connected to the upper connection portion 112 .

The lower surface of the top portion 111A_T may be in contact with the upper surface of the middle portion 111A_S but have the same planar shape. In addition, the top portion 111A_T has a trapezoidal cross-sectional shape, so that the upper surface of the top portion 111A_T may protrude inward (ie, in the direction of the through hole TH) from the lower surface in contact with the middle portion 111A_S. Accordingly, the inner surface between the upper and lower surfaces of the top portion 111A_T may be inclined. At this time, it is preferable that the angle θ between the inner surface of the middle portion 111A_S and the inner surface of the top portion 111A_T is an obtuse angle. That is, the top portion 111A_T may have a protrusion corresponding to a portion that does not overlap with the middle portion 111A_S in a thickness direction (eg, a z-axis direction). At this time, the cross-sectional shape of the protrusion may be a right triangle, and the angle θ formed between the inner surface of the middle portion 111A_S and the inner surface of the top portion 111A_T may correspond to one outer angle of the right triangle formed by the cross-sectional shape of the protrusion. there is. In addition, a portion of the top portion 111A_T excluding the protrusion may have a rectangular cross-sectional shape. An upper surface of the bottom portion 111A_B, an inner surface of the middle portion 111A_S, and an inclined inner surface of the top portion 111A_T may define a receiving hole in the upper accommodating portion 111A in which the upper coil unit 121 is accommodated. .

As a result, the opening exposing at least a portion of the top surface of the conductive plate disposed at the top of the upper coil part 121 upward may be defined by the top surface shape of the top part 111A_T.

Meanwhile, the height h1 of the middle portion 111A_S may be smaller than the height of the upper coil portion 121 accommodated in the receiving hole of the upper accommodating portion 111A. In this case, due to the inclination of the inner surface of the top part 111A_T, when the upper coil part 121 is accommodated in the receiving hole of the upper accommodating part 111A, the uppermost edge of the uppermost conductive plate of the upper coil part 121 is It comes into contact with a portion (B) of the inner surface of the top portion 111A_T.

Due to this structure, even if a tolerance occurs in the form of a lift in the thickness direction of each conductive plate, it is possible to respond to the tolerance by being pressed by the inclined inner surface of the top portion 111A_T, and in the manufacturing process, Insertion is also easy. In addition, since the upper surface edge of the uppermost conductive plate of the upper coil unit 121 contacts the inner surface of the top portion 111A_T with a dot or a line, substantially the entire upper surface of the uppermost conductive plate is in the air as shown in FIG. 3D. Since it can be directly exposed to the inside, the heat dissipation area can be maximized.

In addition, even if a conductor (not shown) constituting the primary coil is located up to a portion of the lower surface of the bottom portion 111A_B overlapping in the thickness direction with the middle portion 111A_S, the shortest insulation between the conductor and the upper coil unit 121 is located. Since the distance is further extended by the distance from the inner edge of the upper surface of the top portion 111A_T to point B at “h2+w1”, this configuration has an effect of additionally securing the insulation distance.

Meanwhile, the distance w2 between the inner surface of the upper coil unit 121 and the middle unit 111A_S may follow the processing tolerance of the bobbin 110A and the conductive plates constituting the upper coil unit 121 . For example, although there is a difference depending on the material, assuming that the tolerance of the bobbin 110A is ±0.2 mm and the tolerance of the conductive plate is ±0.1 mm, the distance between the upper coil part 121 and the inner surface of the middle part 111A_S ( w2) can be up to 0.3 mm. However, the upper coil unit 121 should be fixed while contacting point B of the bobbin 110A. For this purpose, since the top width w1 of the top portion 111A_T must be greater than at least 'w2+t', it is preferable to satisfy the condition 'w1>w2+t'.

In addition, the height h2 of the upper accommodating portion 111A is the sum of the heights of the bottom portion 111A_B, the middle portion 111A_S, and the top portion 111A_T. Therefore, assuming that the height h2 of the upper accommodating portion 111A is fixed, when the distance w2 between the upper coil portion 121 and the inner surface of the middle portion 111A_S decreases, the θ value approaches 90 degrees. However, since the top part 111A_T forms the outer angle of a right triangle corresponding to the protruding part in the direction of the through hole TH, the θ value always exceeds 90 degrees. In addition, even if the height h1 of the middle portion 111A_S becomes infinitely small, the value of θ is bound to be less than 180.

As a result, the value of θ may have a range of '90 < θ < 180'.

In addition, the height h3 of the upper coil part 121 is always greater than the height h1 of the middle part 111A_S, and the height h1 of the middle part 111A_S must be greater to maintain contact with point B. The width w1 of the upper surface of the recording top portion 111A_T should also increase. However, the height h1 of the middle portion 111A_S is always smaller than the height h3 of the upper coil portion 121, and the height h3 of the upper coil portion 121 depends on the thickness of the individual conductive plate. Therefore, assuming that the height h3 of the upper coil part 121 is 4 mm, the height h1 of the middle part 111A_S should be less than 4 mm, and the inner surface of the upper coil part 121 and the middle part 111A_S When the value of θ approaches 90 while maintaining the gap w2 at 0.3 mm, the width w1 of the upper surface of the top portion 111A_T continues to increase, and at some point, it is separated from the top portion (not shown) on the other side facing the y-axis direction. come into contact Since this means that the opening opened in the upward direction of the upper accommodating portion 111A of the bobbin 110A disappears, it is difficult to expect a heat dissipation effect.

Therefore, the upper surface width w1 of the top portion 111A_T is the upper surface of the uppermost conductive plate of the upper coil portion 121 in order to perform the intended heat dissipation function and the fixing function of the upper coil portion 121 through contact with point B. It is preferable to have a size that minimizes the upper coil portion and does not escape upward through the opening. Specifically, in order to prevent the upper coil unit 121 from leaving, when the upper coil unit 121 is assembled to the upper accommodating unit 111A, the gap w2 due to the aforementioned tolerance is generated on both sides, and the top unit 111A_T ) may be twice the distance w2 between the inner surface of the upper coil unit 121 and the middle unit 111A_S. For example, assuming that the thickness t of the middle portion 111A_S is 0.8 mm and the distance w2 between the upper coil portion 121 and the inner surface of the middle portion 111A_S is 0.3 mm, the top portion ( 111A_T) may be 1.4 mm because the upper surface width (w1) is 't+2*w2)'. Of course, since each thickness and spacing described above are exemplary, it is obvious to those skilled in the art that various changes may be made according to the design size of the transformer 100.

3C and 3D have been described based on the upper accommodating portion 111A, but the description of the upper accommodating portion 111A may be equally applied to the lower accommodating portion 115A, except that it is vertically symmetrical.

Next, according to another aspect of this embodiment, in the bobbin 110A shown in FIG. 3C, the top portion 111A_T may be replaced with another shape. This will be described with reference to FIGS. 3E to 3H.

First, as shown in FIG. 3E, the bobbin 110B according to another aspect of the present embodiment is hollow on a plane in one region of the upper surface of the side wall of the upper receiving portion 111B instead of the top portion 111A_T described above with reference to FIG. 3C. A fixing part 111B_PT protruding toward (TH) may be disposed. For example, the fixing part 111B_PT may have a square pillar shape and may extend toward the hollow TH from the center of a portion having a semicircular flat shape among the top surfaces of the side walls of the upper accommodating part 111B. Due to the arrangement of the fixing part 111B_PT, the separation of the upper coil part 121 is prevented when the upper coil part 121 is accommodated, and the heat dissipation area of the conductive plate located at the top of the upper coil part 121 can be secured. can

Also, as shown in FIG. 3F , the bobbin 110C according to another aspect of the present embodiment may include a plurality of fixing parts 111C_PT.

At this time, in common in FIGS. 3E and 3F, one side of each of the fixing parts 111B_PT and 111C_PT facing the through hole TH is the core part that faces when the core part 140 is coupled to the bobbins 110B and 110C. It is preferably extended to contact one side of 140 (eg, parallel to the C axis of FIG. 3F). Through this, each of the fixing parts 111B_PT and 111C_PT can also secure the fixation of the core part 140 together with the coil part.

According to another aspect of this embodiment, as shown in FIG. 3G, the bobbin 110D may include a fixing part 111D_CM having an arcuate flat shape. Even in this case, as shown in FIG. 3H, the straight side of the fixing part 111D_CM extends in contact with one side of the core part 140 facing when the core part 140 is coupled to the bobbin 110D. it is desirable

Meanwhile, in order to fix the core part 140, the middle accommodation part of the bobbin may be deformed. This will be described with reference to FIGS. 3i and 3j.

Referring to FIG. 3I , a bobbin 110A′ in which a middle accommodating portion is deformed 113A′ in the bobbin 110A shown in FIGS. 3A and 3B is shown. Specifically, on the curved surface adjacent to the winding fixing part 117 of the outer wall of the middle accommodating part 113A', the direction (eg, the Y-axis direction) crossing the direction in which the secondary coil unit is inserted (eg, the X-axis direction) direction) may be disposed on both sides of the middle accommodating portion 113A'. Even in this case, as shown in FIG. 3J, one side of the fixing part 119 extends to come into contact with one side of the core part 140, which faces when the core part 140 is coupled to the bobbin 110A'. it is desirable to be

3A to 3I have been described based on the upper accommodating portions 111A, 111B, 111C, and 111D, but the lower accommodating portions 115A, 115B, 115C, and 115D are different from the upper accommodating portions 111A, 111B, 111C, and 111D. Since they are vertically symmetrical, each configuration including the fixing parts 111B_PT, 111C_PT, and 111D_CM may be similarly applied to the lower accommodating parts 115A, 115B, 115C, and 115D.

Next, the configuration of the core unit 140 will be described with reference to FIG. 4 . 4 shows an example of an external perspective view of a lower core. In FIG. 4, the description is based on the lower core 142 of the core portion 140, but the upper core 141 is assumed to have a vertically symmetrical shape with the lower core 142, replacing the description of the upper core 141. do it with

4, the lower surface of the lower core 142 includes a long side extending in one direction (eg, the Y-axis direction) and a short side extending in another direction (eg, the X-axis direction) intersecting the one direction. It may have a rectangular planar shape.

In addition, the lower core 142 may include a midfoot 142_1 (or center) having a track-like columnar shape and side parts 142_2 disposed on both sides facing each other around the midfoot 142_1. At this time, the receiving hole defined as a track-type planar shape cut between the inner surface of the side part 142_2 and the side surface of the midfoot 142_1 so that the lower core 142 can be coupled in a form surrounding the bobbin 110 is a bobbin ( 110) may correspond to the size and shape. Cores of this shape are also referred to as “EPC” cores.

Meanwhile, the midfoot 142_1 may be inserted into the through hole TH of the bobbin 110 . In addition, when combined with the bobbin 110, the midfoot (not shown) of the upper core 141 and the midfoot 142_1 of the lower core 142 may contact each other and are spaced apart at a predetermined interval (eg, 100um). It could be.

Next, the configuration of the plurality of conductive plates constituting the secondary coil unit will be described with reference to FIGS. 5 and 6 .

5 shows planar shapes of two types of conductive plates according to an embodiment.

First, referring to FIG. 5 , conductive plates 120A and 120B having two different planar shapes are shown. Since the first type conductive plate 120A has the same shape as the second type conductive plate 120B except that the left and right sides are reversed, the first type conductive plate will be mainly described.

The conductive plate 120A according to the embodiment may have an open annular planar shape having two ends 120T_M and 120T_R to form one turn of the secondary coil unit. In the present specification including FIG. 5 , the conductive plates 120A and 120B are shown as having an open track shape centered on the track-shaped hollow HC, but this is exemplary and the planar shape may be an open circular/elliptical ring shape or an open polygonal shape. It may be circular.

For example, the first type conductive plate 120A may have a “q”-shaped planar shape. In addition, the second-type conductive plate 120B may have a left-right symmetrical shape with the first-type conductive plate 120A, and may have a “p”-shaped planar shape. Here, based on the first type conductive plate 120A, the first end 120T_M is connected to the ground, so it can be referred to as a ground end, and the second end 120T_R is connected to one signal line, so it is referred to as a first signal end. can be called Similarly, the second type conductive plate 121 may also have one ground end 120T_M' and one signal end 120T_L, wherein the signal end 120T_L is in the opposite direction to the first signal end 120T_R. located, and may be referred to as a second signal end.

Therefore, when four conductive plates are applied to one coil part constituting the secondary coil parts 120 and 130, for example, the upper coil part 121, a total of four ground ends, two first signal ends, and two Two second signal ends are provided. Each of the four ground ends, the two first signal ends, and the two second signal ends may overlap at least a portion or be aligned in a vertical direction.

At this time, each of the two first signal ends, the four ground ends, and the two second signal ends are electrically connected to each other through the fastening part 130, but at least the remaining parts constituting the actual turn do not directly contact each other. can be insulated.

In addition, a through hole H may be provided at each end so that the fastening part 130 may pass therethrough. In FIG. 5 , a hole H having a rectangular planar shape is shown at each end, but the number and location of the holes may be different.

6 is a view for explaining a fastening form between conductive plates according to an embodiment of the present invention.

Referring to FIG. 6 , the secondary coil unit according to the embodiment may be configured with a total of 16 conductive plates. In this case, the first type conductive plate 120A and the second type conductive plate 120B may be alternately stacked in the vertical direction. In addition, the upper four conductive plates form one group to form the upper coil part 121, and the middle eight conductive plates form another group to form the middle coil part 123. , The lower four conductive plates may form another group to form the lower coil unit 125 . As shown, the upper coil unit 121, the middle coil unit 123, and the lower coil unit 125 overlap each other in a vertical direction, but may be spaced apart from each other by a predetermined interval. The separation distance may vary according to the heights of the upper connection part 112 and the lower connection part 114 .

Each conductive plate can be fixed and energized by soldering. For soldering, metal bars 131, 132, and 133 may be inserted into each hole H of the conductive plate in a penetrating manner. Depending on the embodiment, a bus bar BB electrically connected to the metal bars 131, 132, and 133 or penetrated by each of the metal bars 131, 132, and 133 may be additionally provided. The bus bar BB serves as an electrical passage with the secondary side coil when the transformer 100 is mounted on a substrate or the like, and may also serve to fix the transformer 100 to the substrate or the like. In FIG. 6 , each bus bar BB is disposed between the upper coil unit 121 and the middle coil unit 123 and between the middle coil unit 123 and the lower coil unit 125 in the thickness direction, but this is exemplary. , Each bus bar BB may be disposed above the upper coil unit 121 or below the lower coil unit 125 in the thickness direction according to the arrangement relationship with the substrate (not shown).

Meanwhile, in the embodiments described so far, the conductive plate positioned at the outermost part in the thickness direction, for example, the conductive plate positioned at the uppermost end of the upper coil unit 121 and the conductive plate positioned at the lowermost end of the lower coil unit 125 are It is separated from the core part 140 by the fixing parts 111B_PT, 111C_PT, and 111D_CM of the bobbin 110 or the top part 111A_T. Unlike this, according to another embodiment of the present invention, a heat conduction means is disposed between the outermost conductive plate and the core in the thickness direction, and the heat conduction means is disposed on one surface of the outermost conductive plate in the thickness direction and , each of which may be in contact with one surface of the core portion opposite thereto. This will be described with reference to FIG. 7 .

7 is a cross-sectional view showing an example of a bobbin structure to which a heat dissipation means according to another embodiment of the present invention is applied. In FIG. 7, the bobbin 110 may be any bobbin structure shown in FIGS. 3A to 3J. In addition, in FIG. 7, a form in which the conductive wires 161 and 162 constituting the primary side coil unit are wound is also shown.

Referring to FIG. 7 , an upper surface 121TS of the conductive plate disposed at the outermost part in the thickness direction, for example, the uppermost portion of the upper coil unit 121, and an upper core 141 opposite to the conductive plate 121TS. A heat dissipation means (HD, for example, a heat dissipation sheet) having excellent thermal conductivity may be disposed between the lower surface 141BS of the ). Here, the upper surface of the heat dissipation unit HD contacts one lower surface 141BS of the upper core 141 and the lower surface of the heat dissipation unit HD contacts the upper surface 121TS of the conductive plate disposed at the uppermost stage, respectively. Through this, heat generated in the upper coil unit 121 may be quickly transferred to the upper core 141 . This configuration may be equally applied between the lower coil unit 125 and the lower core 142 .

Of course, since the most heat is generally generated near the midfoot of the core part 140 when the transformer operates, if the temperature of the core part 140 is higher, heat from the core part 140 is temporarily transferred to the secondary coil part. The movement through the heat dissipation means HD will be faster than when there is no heat dissipation means HD, but since the main body that releases heat to the bracket or board is the core part 140, the heat of the secondary coil part is eventually transferred to the core. It can be released quickly through section 140.

Although only a few have been described as described above in relation to the embodiments, various other forms of implementation are possible. The technical contents of the above-described embodiments may be combined in various forms unless they are incompatible with each other, and through this, may be implemented in a new embodiment.

In addition, the transformer 100 according to the above-described embodiment may be mounted on an instrument transformer, an AC calculator, a DC-DC converter, a booster, a step-down device, or the like.

It is apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit and essential characteristics of the present invention. Accordingly, the above detailed description should not be construed as limiting in all respects and should be considered illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

100: transformer 110: bobbin
120: conductive plate
130: fastening part 140: core part

Claims (10)

bobbin;
a core part disposed outside the bobbin and exposing a part of the bobbin; and
a plurality of conductive plates inserted into the bobbin, constituting an upper coil part, a middle coil part, and a lower coil part, and stacked in a thickness direction;
The bobbin,
a lower accommodating part for accommodating the lower coil part;
a middle accommodating part disposed on the lower accommodating part and accommodating the middle coil part;
an upper accommodating part disposed on the middle accommodating part and accommodating the upper coil part;
an upper connecting portion connecting the upper accommodating portion and the middle accommodating portion; and
And a lower connection portion connecting the middle accommodating portion and the lower accommodating portion,
The transformer has an opening exposing a portion of an upper surface of an uppermost conductive plate among the plurality of conductive plates in a thickness direction and a portion of a lower surface of the lowermost conductive plate in the thickness direction, respectively. bobbin;
a core part disposed outside the bobbin and exposing a part of the bobbin; and
It is inserted into the bobbin and includes a plurality of conductive plates constituting an upper coil part, a middle coil part, and a lower coil part, respectively,
The bobbin,
a lower accommodating part accommodating the lower coil part;
a middle accommodating part disposed on the lower accommodating part and accommodating the middle coil part; and
An upper accommodating portion disposed on the middle accommodating portion and accommodating the upper coil portion;
The upper accommodating part includes a first protrusion covering at least a part of an upper surface of an uppermost conductive plate of the upper coil part,
The lower accommodating part includes a second protrusion covering at least a part of a lower surface of the lowermost conductive plate of the lower coil part. According to claim 2,
The bobbin,
an upper connecting portion connecting the upper accommodating portion and the middle accommodating portion; and
The transformer further comprises a lower connecting portion connecting the middle accommodating portion and the lower accommodating portion. According to claim 3,
The upper receiving part
a bottom portion in contact with the upper connection portion;
a middle portion forming a sidewall of the upper accommodating portion and extending upward from at least a portion of an upper edge of the bottom portion; and
A transformer comprising a top portion disposed along an upper surface of the middle portion. According to claim 4,
The first protruding portion protrudes from the top portion of the transformer. According to claim 4,
Outer surfaces of each of the bottom portion, the middle portion, and the top portion are parallel in a thickness direction. According to claim 4,
The upper surface of the top part protrudes inward from the lower surface in contact with the middle part on a plane, the transformer. According to claim 7,
The inner surface of the top part is formed to be inclined, the transformer. According to claim 7,
The inner surface of the top part and the inner surface of the middle part form an obtuse angle. According to claim 8,
At least a portion of an edge of the top surface of the uppermost conductive plate of the upper coil part contacts an inner surface of the inclined top part.

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