JP6356465B2 - Winding parts and heat dissipation structure - Google Patents

Description

  The present invention relates to a winding component such as an inductor or a transformer used in a large current power supply device, and more particularly to a winding component in which a metal plate and an insulating plate are alternately laminated to constitute a coil and a heat dissipation structure thereof. is there.

  Instead of winding a wire to form a coil in a product such as a high-power inductor or high-power transformer, alternately stack metal plates (corresponding to wires) and insulation plates that are pressed into a part of the coil shape. There are winding parts that make up the coil. In this type of winding component, when a high frequency current flows through the coil, an eddy current is generated in the metal plate by the magnetic field generated by the coil, the coil generates heat, and the temperature of the product rises. Since the rise in the temperature of the product leads to the breakage or deterioration of the product, measures for suppressing the rise in the temperature of the coil are required.

  In order to suppress the temperature rise of the coil, one method is to reduce the resistance by increasing the cross-sectional area of the metal plate to be laminated (wire diameter if it is an electric wire). This is contrary to the demand for reduction in size and weight of this type of winding component. On the other hand, in practice, there is a tendency to further reduce the cross-sectional area of the metal plate in order to reduce the size and weight, and as a result, the amount of heat generated by the coil increases and the product temperature also increases. The evil that has occurred.

  Therefore, for example, in a winding component with a large calorific value, such as a large current specification, as seen in Patent Documents 1 and 2, the bottom surface of the core that surrounds the coil and forms a closed magnetic circuit is provided with a heat dissipation function. A structure is often employed in which heat generated from the winding component is released to the outside by being brought into contact with the housing having the.

JP 2009-206308 A JP 2011-61096 A

  However, it is the metal plate that constitutes the coil that actually generates heat, and as described in Patent Documents 1 and 2, it is not efficient to release the heat generated in the coil through the core.

  The present invention has been made in view of the above circumstances, and can efficiently release the heat generated by the coil to the outside, thereby reducing the product temperature, thereby reducing the size and weight. It is an object of the present invention to provide a winding component and a heat dissipation structure thereof that can be used.

In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that a coil formed by alternately laminating metal plates and insulating plates formed in a partial shape of the coil, and a closed magnetic circuit surrounding the coil. in coil component having a core formed in the metal plate located in the middle portion of the lamination direction, extends for heat dissipation is thermally connected to the housing having an extending out and heat radiation function to the outside of the coil The heat-dissipating extension part is formed in a rectangular shape in which the extension is made with the maximum width in the laminated part of the metal plate located in the intermediate part. .

  According to a second aspect of the present invention, in the first aspect of the present invention, the heat radiating extension is thermally applied to the casing on the insulating plate adjacent to the metal plate on which the heat radiating extension is formed. An insulating extension that is interposed between the heat-dissipating extension and the housing and is insulated between the heat-dissipating extension and the housing when connecting to the heat-dissipating extension. It is characterized by being formed.

  Further, in the invention according to claim 1 or 2, in the invention according to claim 3, the heat radiating extension is bent in an L shape from the direction extending outside the coil toward the stacking direction. According to a fourth aspect of the present invention, the heat radiating extension portion is bent in a U shape from the direction extending to the outside of the coil toward the stacking direction, and then bent. A flange for mounting and fixing to the casing is provided at the tip.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the coil on one side and the other side in the laminating direction are sandwiched between the metal plates having the heat radiating extension. The position of the metal plate having the heat radiating extension is determined so that the coils have the same temperature.

  The invention according to claim 6 is the invention according to any one of claims 1 to 4, wherein the coil is divided into a plurality of layers in the stacking direction, and is biased toward the coil having a large heat generation amount. The heat radiation extending portion is provided on the metal plate at the position.

  The invention according to claim 7 is characterized in that, in the invention according to any one of claims 1 to 4, the extending portion for heat dissipation is formed on the plurality of metal plates.

  In the invention according to claim 8, the heat-dissipating extension part of the winding component according to any one of claims 1 to 7 is disposed on a casing having a heat-dissipating function with a heat-conductive insulating material interposed therebetween. And is thermally connected.

  According to the invention according to any one of claims 1 to 8, the extending portion for heat dissipation extending to the outside of the coil is formed on the metal plate constituting the coil which is the main body of heat generation during operation, and is directly Since it is thermally connected to the casing having a heat radiation function, the heat of the coil can be efficiently released to the casing. At that time, since the heat radiating extension is formed on the metal plate located in the middle part in the stacking direction of the metal plate and the insulating plate, the coils on both ends in the stacking direction are provided without providing many heat radiating extensions. Heat can be released to the outside in a well-balanced manner. Therefore, it is possible to suppress the temperature rise of the product while reducing the size and weight of the product.

  In particular, according to the second aspect of the present invention, the insulating plate adjacent to the metal plate on which the heat radiating extension is formed is an insulating material when the heat radiating extension is thermally connected to the housing. Insulation extension is provided, and it is formed along the heat dissipation extension, so separate insulation is required to thermally connect the heat dissipation extension to the housing In addition, it is possible to reinforce and protect the heat radiating extension that extends outside the coil by the insulating extension.

  According to the invention described in claim 3 or claim 4, since the heat radiating extension portion is bent in an L shape or a U shape from the extending direction to the outside of the coil in the stacking direction. The overhang dimension of the heat radiation extending portion when viewed from the stacking direction can be reduced, and the mounting space for the winding component can be reduced.

  According to the invention described in claim 5, the heat-dissipating extension part so that the temperatures of the coil on one side and the coil on the other side in the stacking direction are equal across the metal plate having the heat-dissipating extension part. Since the position of the metal plate having the above is determined, the temperature balance of the coil can be kept good.

  According to the sixth aspect of the present invention, when a plurality of coils are provided divided in the stacking direction, the heat radiating extension is provided on the metal plate at a position biased toward the coil side where the heat generation amount is large. Therefore, the temperature balance of the entire coil can be kept good.

  According to the seventh aspect of the present invention, since the heat radiation extending portions are formed on the plurality of metal plates, the heat radiation efficiency can be further improved while considering the balance with weight reduction.

It is a disassembled perspective view which shows the structure of the multilayer inductor as a coil | winding component of 1st Embodiment of this invention. It is an external appearance perspective view of the multilayer inductor. It is a perspective view which shows the thermal radiation structure which mounted the laminated inductor on the upper surface of the housing | casing. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic explanatory diagram for explaining a difference in mounting space between a multilayer inductor according to a first embodiment and a multilayer inductor according to a modification thereof, (a) is a side view of the multilayer inductor according to the first embodiment, and (b) is a modification. It is a side view of the multilayer inductor. It is a disassembled perspective view which shows the structure of the multilayer inductor as a winding component of 2nd Embodiment of this invention corresponding to the modification of the said FIG.4 (b). It is a perspective view which shows the thermal radiation structure which mounted the laminated inductor on the upper surface of the housing | casing. It is a disassembled perspective view of the multilayer inductor as a winding component of 3rd Embodiment of this invention. It is a perspective view which shows the thermal radiation structure which mounted the laminated inductor on the upper surface of the housing | casing. It is a disassembled perspective view of the multilayer inductor as a coil | winding component of 4th Embodiment of this invention. It is a perspective view which shows the thermal radiation structure which mounted the laminated inductor on the upper surface of the housing | casing. It is sectional drawing of the X section in the thermal radiation structure shown in FIG.

(First embodiment)
1 to 3 show a first embodiment in which a winding component according to the present invention is applied to a multilayer inductor.
As shown in FIGS. 1 and 2, the laminated inductor 1A of the embodiment includes a coil 10A configured by alternately laminating metal plates 11 and insulating plates 12 formed in a partial shape of the coil, and the coil 10A. It has a pair of upper and lower cores 3 and 4 that surround and form a closed magnetic path.

  Here, the pair of upper and lower cores 3 and 4 are E-shaped cores formed of a ferrite material, and the outer legs 3a and 4a are arranged along the axial direction on the outer periphery of the coil 10A, and the middle legs 3b and 4b are Inserted into the center hole of the coil 10A and brought into contact with each other's tip surfaces, the coil 10A is surrounded so as to form a closed magnetic circuit.

  Each metal plate 11 constituting the coil 10A is formed by pressing a copper plate into a pattern shape (ring shape with both ends spaced apart) for approximately one turn of the coil 10A, when viewed from above in the stacking direction. The ring is formed in a clockwise ring shape from one end 14 in the circumferential direction toward the other end 15. The insulating plates 12 insulate adjacent metal plates 11 and are disposed at both ends in the stacking direction in addition to between the metal plates 11 and 11. Here, in order to prevent a temperature difference between the metal plates 11 from becoming large, the insulating plate 12 is formed in an annular shape having a center hole by a material having a small thermal resistance (good thermal conductivity material). Moreover, the metal plate 11 and the insulating plate 12 are joined together with an adhesive having good heat conductivity.

  Both ends (one end 14 and the other end 15) in the circumferential direction of the metal plate 11 formed in a ring shape are formed so as to protrude outside the insulating plate 12, and the upper end of the metal plates 11 at both ends in the stacking direction is formed. One end 14 of the metal plate 11 and the other end 15 of the lower metal plate 11 are configured as external connection terminals 13 and 16. Further, the other end 15 of each upper metal plate 11 in the stacking direction and the one end 14 of each lower metal plate 11 are formed so as to be shifted for each layer at a position where they are overlapped when viewed from the stacking direction. . The other end 15 of the upper metal plate 11 and the one end 14 of the lower metal plate 11 are successively connected by welding or soldering after the metal plate 11 and the insulating plate 12 are laminated, thereby forming a spiral shape. A coil 10A that circulates around is formed. Then, both ends of the coil 10 </ b> A are drawn out to the outside of the coil 10 </ b> A as external connection terminals 13 and 16.

  Of the plurality of metal plates 11 constituting the coil 10A, the metal plate 11A located at the intermediate portion in the stacking direction has a casing 100 that extends linearly outside the coil 10A and has a heat dissipation function. A heat radiating extension 21 that is thermally connected to (see FIG. 3) is formed. The heat radiating extension 21 is formed as a rectangular plate extending with the maximum width of the laminated portion of the metal plate 11A. Further, the lower insulating plate 12A adjacent to the metal plate 11A on which the heat radiating extension 21 is formed has a heat radiating extension 21 when the heat radiating extension 21 is thermally connected to the housing. An insulating extending portion 22 is formed along the heat dissipating extending portion 21 so as to be interposed between the heat dissipating extending portion 21 and the housing.

  In the case of this embodiment shown in FIG. 1, since the number of the metal plates 11 is 5, the heat radiation extending portion 21 is provided on the central metal plate 11A that is third from the top in the stacking direction. When the number of the metal plates 11 is arbitrary N, the heat radiation extending portion 21 is provided on the N / 2th metal plate 11 from the top in the stacking direction or the metal plate 11 closest thereto. Is preferred.

  As shown in FIG. 3, the heat dissipation extending portion 21 extending outside the coil 10 </ b> A in this way is interposed through the insulating extending portion 22 having good thermal conductivity, and the housing 100 having a heat dissipation function. By thermally connecting to the upper surface of the heat dissipating seat 101, the heat dissipating structure of the multilayer inductor 1A is obtained.

  The casing 100 is a die-cast member provided with a heat radiation function by air cooling fins 100a or water cooling cooling water passages (not shown), and the upper surface is an inductor mounting surface. A rectangular parallelepiped heat dissipating seat 101 is provided on the mounting surface. The heat radiating extension 21 is placed on the upper surface of the heat radiating seat 101 with the insulating extended portion 22 facing downward, and is fixed by a screw (not shown) or a good heat conductive adhesive. The core 4 of the multilayer inductor 1A may or may not be in contact with the upper surface of the housing 100.

  According to the multilayer inductor 1A having the above configuration and the heat dissipation structure thereof, the heat radiation extending portion 21 extending outside the coil 10A is formed on the metal plate 11A that constitutes the coil 10A that is the main component of heat generation during operation. Is directly connected to the casing 100 having a heat dissipation function, so that the heat of the coil 10A can be efficiently released to the casing 100.

  At that time, since the heat radiation extending portion 21 is formed on the metal plate 11A located in the middle portion of the metal plate 11 and the insulating plate 12 in the stacking direction, the heat radiation extending portions 21 are not provided in large numbers. The heat of the coil 10A on both ends in the direction can be released to the outside in a balanced manner. Therefore, the temperature rise of the multilayer inductor 1A can be suppressed while reducing the size and weight of the multilayer inductor 1A.

  Further, an insulating extension 12 serving as an insulating material when the heat radiating extension 21 is thermally connected to the casing 100 is connected to the lower insulating plate 12A on which the heat radiating extension 21 is formed. 22, and the insulating extension 22 is formed along the heat dissipation extension 21. Therefore, it is necessary when the heat dissipation extension 21 is thermally connected to the housing 11. In addition, it is not necessary to separately prepare an insulating material to be used, and the extension part 22 for heat radiation extending to the outside of the coil 10 </ b> A can be reinforced and protected by the insulation extension part 22.

  FIG. 4 is a schematic explanatory diagram for explaining a difference in mounting space between the multilayer inductor 1A of the first embodiment and the multilayer inductor 1B of the modification, and FIG. 4A is a side view of the multilayer inductor 1A of the first embodiment. FIG. 4B is a side view of a multilayer inductor 1B according to a modification.

  As shown in FIG. 4A, when the heat radiation extending portion 21 is simply extended out of the coil 10A while being flat, the mounting space S1 of the multilayer inductor 1A when viewed from the upper side in the stacking direction becomes large. . Therefore, as in the multilayer inductor 1B of the modified example shown in FIG. 4B, the direction (lateral direction) in which the heat radiating extension 21B and the insulating extension 22B below it are extended to the outside of the coil 10B. ) To the L direction from the stacking direction (upward). If it does so, mounting space S2 of the multilayer inductor 1B at the time of seeing from the upper side of the lamination direction can be made small.

(Second Embodiment)
FIGS. 5 and 6 show the configuration of the multilayer inductor according to the second embodiment of the present invention corresponding to the modification of FIG. 4B. In the multilayer inductor 10B according to the second embodiment, a coil 10B is shown. The number of metal plates 11 constituting the number is six, and the number of insulating plates 12 is correspondingly increased from that of the first embodiment.

  And the heat-dissipation extension part 21B is provided in the 4th metal plate 11B from the top located in the intermediate part of the lamination direction, and the insulation extension part 22B is provided in the lower insulating plate 12B. Moreover, the heat radiating extension 21B and the insulating extension 22B are bent in an L shape from the direction (lateral direction) extending to the outside of the coil 10B toward the stacking direction (upward direction).

  In order to obtain a heat dissipation structure by thermally connecting the heat radiation extending portion 21B bent in an L-shape of the multilayer inductor 10B to the housing 100, as shown in FIG. The heat radiating plate 102 is set up vertically, and the heat radiating extension 21B is fixed to the vertical plate surface of the heat radiating plate 102 via the insulating extension 22B. The heat radiating plate 102 is thermally and mechanically connected to the mounting surface of the housing 100 using screws 103 or the like.

  Thus, when the heat radiating extension 21B and the insulating extension 22B are bent in an L shape, the projecting dimensions of the heat radiating extension 21B and the insulating extension 22B when viewed from the stacking direction are as follows. Since it can be reduced, the mounting space for the multilayer inductor 1B can be reduced.

(Third embodiment)
7 and 8 show a multilayer inductor according to a third embodiment of the present invention. In this third embodiment, a large creepage distance is ensured between the coil and the core due to a requirement in safety standards. An example of when it is necessary is shown. That is, when the core is made of a conductive material such as an MnZn ferrite core, for example, depending on the required safety standard, a large creepage distance of several to 10 mm is required between the coil and the core. May be secured.

    In addition, a required creepage distance may be ensured between the casing on which the multilayer inductor is mounted and the coil. If a large creepage distance is to be ensured, the product inevitably increases in size, but in this embodiment, both the safety standard and the heat dissipation are ensured without increasing the product size.

  Specifically, as shown in FIG. 7, in this multilayer inductor 1C, in order to ensure a required creepage distance between the coil 10C and the cores 3 and 4, between the cores 3 and 4 and the coil 10C. Insulating covers 5 and 6 are arranged. Further, since the aluminum heat radiating plate 102 which is a heat radiating material also has the same potential as the cores 3 and 4 and the housing 100, as shown in FIGS. 7 and 8, the coil 10C and the aluminum heat radiating plate 102 are disposed between. In addition, a cap-shaped insulating cover 23 for interposing a required creepage distance is interposed.

  The insulating cover 23 is formed using a silicon rubber agent having good thermal conductivity. When the heat radiating extension portion 21B is fixed to the heat radiating plate 102, the heat radiating extension portion 21B and the heat radiating portion 21B are disposed. It has a bottom plate 23a interposed between the plate 102 and an upstanding side plate 23b that covers the heat radiating extension 21B from the periphery of the bottom plate 23a.

  The configuration of the coil 10C is basically the same as that of the coil 10B of the multilayer inductor 1B of the second embodiment, but an insulating material interposed between the heat radiating extension 21B and the heat radiating plate 102 is an insulating cover. 23, the insulating extension 22B (see FIG. 5) provided on the insulating plate is omitted.

(Fourth embodiment)
9 to 11 show a multilayer inductor according to a fourth embodiment of the present invention.
In the multilayer inductor 1A according to the first embodiment shown in FIG. 1 and the multilayer inductor 1B according to the second embodiment shown in FIG. 5, the metal plates 11A and 11B immediately below the metal plates 11A and 11B on which the heat radiation extending portions 21 and 21B are formed. Although the case where the extending portions 22 and 22B for insulation are formed on the insulating plates 12A and 12B is shown, as shown in FIG. 9, in the multilayer inductor 1D of the fourth embodiment, the metal on which the extended portion 21D for heat dissipation is formed An insulating extension 22D is formed on the insulating plate 12D immediately above the plate 11D.

  Specifically, a heat radiating extension 21 </ b> D extending outward from the coil 10 </ b> D is bent downward in a U shape, and a flange 25 is provided at the tip. Similarly, an insulating extension 22D extending from the coil 10D to the outside is bent in a U shape downward along the outer peripheral surface of the heat dissipation extension 21D, and a flange 26 is provided at the tip.

  Below the flange 25 of the heat radiating extension 21D, the flange 26 of the insulating extension 22D is positioned. As shown in FIGS. 10 and 11, the flange 25 of the heat radiating extension 21D. Can be placed and fixed on the upper surface of the heat dissipating seat 101 on the housing 100 while being insulated with the flange 26 of the insulating extension 22D sandwiched therebetween. Other configurations are the same as those in the first and second embodiments.

  As shown in FIGS. 10 and 11, when the flange 25 of the heat radiating extension 21 </ b> D and the flange 26 of the insulating extension 22 </ b> D are fixed to the heat radiating seat 101 on the housing 100 with screws 103, an insulating rubber bush The screw 103 is screwed into the screw hole on the heat dissipating material 101 side while the 28 is attached to the outer periphery of the screw 103. By doing so, it is possible to insulate between the flange 25 of the heat radiating extension 21 </ b> D and the heat radiating seat 101. In addition to the screws, the flange 25 of the heat radiating extension 21D may be thermally connected to the housing 100 side using an insulating adhesive.

  In this way, the heat radiating extension 21D and the insulating extension 22D are bent downward in a U-shape and fixed to the heat radiating seat 101 on the housing 100 by the flanges 25 and 26 formed at their tips. In this case, it is not necessary to stand the aluminum heat dissipation plate 102 on the housing 100 as in the second embodiment shown in FIGS.

  The above-described heat radiation extending portion may be provided on any metal plate as long as it is an intermediate metal plate in the stacking direction. It is desirable to determine the position of the metal plate having the heat radiating extension so that the maximum temperature of the coil on one side and the coil on the other side in the stacking direction are equal across the metal plate having the extension.

  For example, when a plurality of different coils are included in a coil as one laminated body with a common core, such as the primary side and the secondary side of the transformer, Depending on the current flow, the amount of heat generated by coils in different systems may vary. In such a case, the position of the metal plate having the heat radiating extension portion is determined by being biased toward the coil having the larger amount of heat generation. And it is good to make the maximum temperature of the coil of the one side of a lamination direction and the coil of the other side become equal on both sides of the metal plate which has the extension part for thermal radiation.

  Note that the present invention can be widely applied not only to the above-described embodiment but also to a case where other various winding parts are attached to a housing having a heat dissipation function.

  Moreover, although the case where the extending part for heat radiation was formed only on one metal plate was shown in the above-described embodiment, the extending part for heat radiation was formed on a plurality of metal plates, and each extending for heat radiation was formed. It can also be configured to thermally connect the part to the housing. In such a case, a further heat dissipation effect can be achieved.

1A, 1B, 1C, 1D multilayer inductor (winding parts)
3,4 Core 10A, 10B, 10C, 10D Coil 11A, 11B, 11D Metal plate 12A, 12B, 12D Insulating plate 21, 21B, 21D Radiating extension 22, 22B, 22D Insulating extension 23 Insulating cover 100 Housing

Claims (8)

In a winding component having a coil configured by alternately laminating metal plates and insulating plates formed in a partial shape of the coil, and a core surrounding the coil and forming a closed magnetic circuit,
On the metal plate located in the intermediate portion in the stacking direction, a heat radiating extension is formed that extends to the outside of the coil and is thermally connected to a housing having a heat radiating function ,
The winding component according to claim 1, wherein the heat radiating extension is formed in a rectangular shape having the extension with the maximum width in the laminated portion of the metal plate positioned in the intermediate portion .   An insulating plate adjacent to the metal plate on which the heat dissipation extension is formed is interposed between the heat dissipation extension and the casing when the heat dissipation extension is thermally connected to the casing. The winding component according to claim 1, wherein an insulating extension portion that insulates between the heat dissipation extension portion and the housing is formed along the heat dissipation extension portion.   The winding component according to claim 1 or 2, wherein the heat radiating extension portion is bent in an L shape from a direction extending to the outside of the coil toward the stacking direction.   The heat radiation extending portion is bent in a U-shape from the direction extending to the outside of the coil toward the stacking direction, and a flange for mounting and fixing to the housing is provided at the bent tip. The winding component according to claim 1 or 2.   The position of the metal plate having the heat radiation extension is determined so that the temperature of the coil on one side and the coil on the other side in the stacking direction are equal across the metal plate having the heat radiation extension. The winding component according to any one of claims 1 to 4.   A plurality of the coils are provided in a divided manner in the stacking direction, and the heat radiating extension is provided on the metal plate at a position biased to the side of the coil that generates a large amount of heat. Winding part in any one of -4.   The winding component according to any one of claims 1 to 4, wherein the heat radiation extending portion is formed on the plurality of metal plates.   The heat radiation extending portion of the winding component according to any one of claims 1 to 7, wherein the heat radiation extending portion is thermally connected to a housing having a heat radiation function via an insulating material having good heat conductivity. Heat dissipation structure for winding parts.

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