JP6638338B2 - Support member and power supply - Google Patents

Description

  The present invention relates to a support member and a power supply device using the support member.

  2. Description of the Related Art Conventionally, as a structure for fixing a heat-generating component used in a power supply device such as a DC-DC converter to a substrate or a housing, there has been known a method of pressing and fixing with an elastic member. For example, as shown in Patent Literature 1, a presser spring that elastically presses on a core of a winding component is provided, and when the cover is attached to the housing, the cover presses the presser spring to press the winding component. A configuration for fixing is known.

JP 2014-204487 A

  By the way, switching elements and winding parts used in a power supply device that uses relatively large power, such as those mounted on a vehicle, need to efficiently radiate heat because of large heat generation. In addition, when a plurality of winding components such as a transformer, a resonance coil, and a choke coil, and a plurality of switching elements used for a half-bridge circuit, a full-bridge circuit, and a rectification circuit are mounted on a substrate, a simpler method is used. It is also necessary to fix to the substrate or the housing with.

  The present invention has been made in view of the above-described problems, and heat radiation of a heat-generating component such as a winding component or a switching element is suitably performed, and is firmly fixed to a substrate or a housing, and is simplified. An object is to provide a support member and a power supply device that can be assembled.

  A support member according to the present invention protrudes toward a substrate and is thermally connected to a first heat-generating component. A housing that protrudes in a direction opposite to the first protrusion and accommodates the substrate. And a second heat-generating component fixed to the support, the second heat-generating component being different from the first heat-generating component and being pressed to the substrate. And a pressing member that performs the pressing.

  Accordingly, since the first and second protrusions for dissipating the heat of the heat-generating component and the pressing member for pressing and fixing the heat-generating component are provided, the heat radiation of the heat-generating component is preferably performed. At the same time, the heat-generating component can be firmly fixed to the substrate or the housing.

  Further, in the support member according to the present invention, the first protrusion and the second protrusion may be formed of a single plate-shaped member. Thereby, the first convex portion and the second convex portion can be formed only by simple processing.

  Further, in the support member according to the present invention, the first heat generating component may include at least a winding component, and the pressing member may press a core included in the winding component toward the substrate. Thereby, the heat radiation of the winding component is suitably performed, and the winding component can be firmly fixed to the substrate.

  Further, in the support member according to the present invention, the core has a longitudinal direction and a lateral direction, the first protrusion presses a substantially central portion of the core in the longitudinal direction toward the substrate, and the pressing member has at least It may have two legs, and the legs may be arranged at both ends in the longitudinal direction of the core so as to sandwich the first protrusion, and may press the core toward the substrate. As a result, the substantially central portion and both ends of the core can be pressed toward the substrate, so that the core can be pressed against the substrate with substantially uniform force, and the winding components can be firmly and firmly fixed to the substrate in a well-balanced manner. Can be.

  Further, in the support member according to the present invention, the winding component includes a first winding component and a second winding component, and the pressing member is formed by a first pressing leg group extending from the center to one side. The first core of the first winding component may be pressed in the direction of the substrate, and the second core of the second winding component may be pressed in the direction of the substrate by the second pressing leg group extending to the other side. . Thereby, a plurality of winding components can be pressed in the direction of the substrate by one supporting member, so that the manufacturing process and the assembling process can be simplified.

  Further, in the support member according to the present invention, the substrate may include a pattern coil included in the winding component, and the pressing member may include a third pressing leg that presses the pattern coil toward the housing. This makes it possible to dissipate the heat from the pattern coil to the housing, and more appropriately dissipate the heat from the winding component.

  Further, the power supply device according to the present invention may include the above-described support member. This makes it possible to provide a power supply device having excellent heat dissipation and assemblability.

  According to the present invention, a heat-generating component such as a winding component or a switching element is appropriately radiated, and is firmly fixed to a substrate or a housing, and can be assembled by a simple method. Can be provided.

It is a perspective view of a support member concerning a 1st embodiment of the present invention. It is the perspective view which looked at the support member concerning a 1st embodiment of the present invention from the back. It is a perspective view showing the power supply device in which the support member of the present invention was arranged. FIG. 4 is a perspective view of the power supply device with the support removed from FIG. 3. It is a top view of the power supply device showing the positional relationship of the winding component of this invention and a support member. It is a top view of the power supply device showing the positional relationship of the winding component of this invention and a support member. FIG. 6 is a sectional view taken along line AA shown in FIG. 5.

  Hereinafter, preferred embodiments of the present invention will be described. The object of the present invention is not limited to the following embodiments. The components described below include those that can be easily assumed by those skilled in the art and those that are substantially the same, and the components can be appropriately combined.

  Embodiments of the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same elements will be denoted by the same reference symbols, without redundant description.

  First, a support member 1 according to a preferred embodiment of the present invention will be described with reference to FIG. FIG. 1 is a perspective view of a support member according to the first embodiment of the present invention.

  As shown in FIG. 1, the support member 1 according to the first embodiment of the present invention includes a support 2 and a pressing member 3. The support 2 is made of a single plate-like member such as a metal having thermal conductivity, and has a rectangular shape in plan view. The support 2 also includes a second convex portion 4 protruding upward, and a first convex portion 5 protruding in a direction opposite to the second convex portion 4 and concave downward (substrate side). The second protrusion 4, the first protrusion 5, and the second protrusion 4 are formed in this order from the longitudinal direction of the support 2.

  FIG. 2 is a perspective view of the support member 1 shown in FIG. 1 as viewed from below. The pressing member 3 fixed to the support 2 includes a first pressing member 6 and a second pressing member 7. Further, the pressing member 3 is fixed to a flat portion of the support 2 where the second convex portion 4 and the first convex portion 5 are not provided. The pressing member 7, the first pressing member 6, and the second pressing member 7 are formed in this order. Each of the first pressing member 6 and the second pressing member 7 includes fixing portions 8 and 9 that are fixed by contacting the support 2, and legs connected to the fixing portions 8 and 9. The fixing portions 8 and 9 are fixed to the support 2 by, for example, caulking or welding.

  The first pressing member 6 includes a first pressing leg group 10 having two legs 10a and 10b extending from the fixing portion 8 to one side, and two legs extending from the fixing portion 8 to the other side. A second pressing leg group 11 having 11a and 11b is provided. The first pressing leg group 10 and the second pressing leg group 11 also extend downward (toward the substrate) from the fixed portion 8 and are formed in a stepped shape bent in the middle of the leg portion.

  The fixing part 9 of the second pressing member 7 is fixed to the flat part of the support 2 so as to be provided along with the second convex part 4. Further, the second pressing member 7 includes a third pressing leg 12 connected to the fixing portion 9. Similarly to the first and second pressing leg groups 10 and 11, the third pressing leg 12 extends downward (toward the substrate) from the fixed portion 9 and is formed in a stepped shape bent in the middle of the leg. Have been. The third pressing legs 12a and 12b extend inward (toward a center of a substrate described later) from the fixing portion 9.

  Next, a power supply device 20 provided with the support member 1 of the present invention will be described with reference to FIG. FIG. 3 is a perspective view illustrating a schematic configuration of the power supply device according to the first embodiment of the present invention.

  The power supply device 20 described in the present embodiment is, for example, a switching power supply device that converts a DC voltage input from a high-voltage battery connected to an input terminal (step-down) and generates a desired DC output voltage.

  The power supply device 20 is one in which electronic components such as an input smoothing capacitor, a switching element, a transformer, a rectifier circuit, an output smoothing capacitor, and an inductor are connected to a circuit board 21 and housed in a housing 22. Among them, the transformer 23 and the resonance inductor 24 are so-called winding components including a winding and a core around which the winding is wound. Although the power supply device 20 is configured to include a large number of electronic components in addition to the above electronic components, the description is omitted except for the main electronic components in the power supply device 20 according to the present embodiment.

  The housing 22 forms a part of a metal case that houses components such as the circuit board 21 of the power supply device 20. The housing 22 includes a base plate 31 and a side wall 32 surrounding the base plate 31. In the power supply device 20, the electronic component is accommodated in the housing 22 and then covered with the case 40. The circuit board 21 is directly or indirectly mounted on a base plate 31 constituting a bottom surface of the housing 22.

  The circuit board 21 is formed, for example, by forming a circuit pattern made of a conductor on the front and back surfaces of a base plate made of an insulating material such as a resin, and further covering the circuit pattern with an insulating material such as a resin. In the present embodiment, the circuit board 21 has a substantially rectangular shape. As the circuit board 21, a multilayer board in which insulating materials and circuit patterns (conductor layers) are alternately laminated may be used. The conductor of the circuit pattern is connected to an electronic component such as a semiconductor element connected to the circuit board 21 to form a power supply circuit in the power supply device 20. On the circuit board 21 in the present embodiment, windings of pattern coils 27 and 30 described later are also formed.

  The support member 1 is provided with a hole 39 at an end in the longitudinal direction. The screw inserted into the hole 39 is screwed into a screw hole 41 provided in a boss 42 on the upper surface of the side wall 32. Thereby, the support member 1 and the housing 22 are fixed. The boss 42 and the screw hole 41 may be provided on the base plate 31 of the housing 22. However, by providing the boss 42 and the screw hole 41 on the upper surface of the side wall 32, a large area of the circuit board 21 can be secured, and Contributes to

  Next, with reference to FIG. 4, a description will be given of the power supply device 20 when the support 2 is removed from the support member 1 of the present invention. FIG. 4 is a perspective view illustrating a schematic configuration of the power supply device 20 when the support 2 is removed from the support member 1.

  The circuit board 21 includes a transformer 23 (a specific example of a first heat-generating component) disposed between the primary side and the secondary side, and a resonance inductor 24 (second heat-generating element) as a choke coil on the primary side. (A specific example of a component). The transformer 23 includes a pair of magnetic cores 25 and 26 and a pattern coil 27 that forms a winding disposed on the circuit board 21. The magnetic core 25 corresponds to a specific example of the first core. Similarly, the resonance inductor 24 includes a pair of magnetic cores 28 and 29 and a pattern coil 30 that forms a winding disposed on the circuit board 21. In this embodiment, the pair of magnetic cores 25 and 26 and the pair of magnetic cores 28 and 29 constitute a so-called EI type magnetic core. The magnetic core 28 corresponds to a specific example of the second core. Specifically, the magnetic cores 25 and 26 and the magnetic cores 28 and 29 are rectangular in plan view, and have a longitudinal direction and a lateral direction. The E-shaped magnetic core 25 is arranged above the circuit board 21 such that the short side of the circuit board 21 is in the longitudinal direction, and the I-shaped magnetic core 26 is arranged below the circuit board 21. . The circuit board 21 is provided with three openings 33, 34, 35 for inserting the legs of the magnetic core 25, corresponding to the legs of the magnetic core 25. The three legs of the E-shaped magnetic core 25 are inserted into the openings 33, 34, 35, respectively. A pattern coil 27 is formed in the circuit board 21 so as to be wound around the central opening 34. The windings of the coil in the pattern coil 27 are wired with the number of turns on the primary side and the number of turns on the secondary side according to the necessity of the circuit.

  Similarly, the magnetic cores 28 and 29 constituting the resonance inductor 24 (one specific example of the second winding component) also constitute a so-called EI type magnetic core. Specifically, an E-shaped magnetic core 28 is disposed above the circuit board 21 such that the short side of the circuit board 21 is in the longitudinal direction, and an I-shaped magnetic core 29 is provided below the circuit board 21. Has been arranged. The circuit board 21 is provided with three openings 36, 37, 38 for inserting the legs of the E-shaped magnetic core 28 along the short side direction of the circuit board 21. The three legs of the E-shaped magnetic core 28 are inserted into the openings 36, 37, and 38, respectively. The pattern coil 30 is formed in the circuit board 21 so as to wind around the central opening 37. The number of turns of the coil in the pattern coil 30 is determined according to the necessity of the circuit.

  Next, the support member 1 will be described. The first pressing leg group 10 having the two legs 10 a and 10 b provided on the first pressing member 6 of the support member 1 has the ends of the legs disposed on the upper surface of the magnetic core 25 of the transformer 23. Is done. The two legs 10a and 10b are disposed at both ends in the longitudinal direction of the magnetic core 25, respectively. Similarly, in the second pressing leg group 11 having two legs 11a and 11b, the tip of the leg is disposed on the upper surface of the magnetic core 28 of the resonance inductor 24, and the two legs 11a and 11b are disposed. 11b are arranged at the longitudinal ends of the magnetic core 28, respectively. That is, the legs 11 a and 11 b press the resonance inductor 24, which is a second heat generating component different from the first heat generating component 23, toward the circuit board 21. The first pressing leg group 10 and the second pressing leg group 11 are made of a material that can press the magnetic cores 25 and 28 toward the base plate 31 with a desired force when the support member 1 is attached to the housing 22. And shape. In the present embodiment, each of the legs has a stepped shape, so that when the magnetic cores 25 and 28 are pressed from above, a stress repelling from below to above due to elasticity is more efficiently applied. I have. Thereby, the magnetic cores 25 and 28 can be firmly fixed.

  The third pressing leg 12 is a leg for pressing the circuit board 21 on which the pattern coil 27 of the transformer 23 (one specific example of the first winding component) is disposed in the direction of the base plate 31. The third pressing leg 12 has two pressing legs 12a and 12b in the present embodiment. The pressing leg 12a extends from the fixing portion 9 toward the center of the circuit board 21 so as to press a part of the pattern coil 27 disposed substantially at the center of the circuit board 21. Similarly, the pressing leg 12b extends from the fixing portion 9 toward the center of the circuit board 21 so as to press another part of the pattern coil 27 disposed substantially at the center of the circuit board 21. The third pressing leg 12 is also formed of a material and a shape that can press the pattern coil 27 in the direction of the base plate 31 with a desired force when the support member 1 is attached to the housing 22. The length from the fixing portion 9 to the tip of the third pressing leg 12 is longer than the length from the fixing portion 8 to the tip of the first pressing leg group 10 or the second pressing leg group 11. Is set to The length of each pressing leg is adjusted so that an appropriate stress is applied according to the height of the magnetic cores 25 and 28 as viewed from the circuit board 21. Note that an insulating sheet having thermal conductivity may be arranged between the pattern coil 27 and the third pressing leg 12 so that they are not electrically short-circuited.

  FIG. 5 and FIG. 6 are plan views of the power supply device showing the positional relationship of the support member 1 of the present invention.

  When the support member 1 is fixed to the housing 22, the first convex portion 5 is located between the two leg portions 10a and 10b constituting the first pressing leg group 10 in plan view. The lower flat surface of the first projection 5 is configured to be in surface contact with the upper surface of the magnetic core 25. In other words, the magnetic core 25 of the transformer 23 is pressed at the substantially central portion in the longitudinal direction of the magnetic core 25 in the direction of the circuit board 21 by the first protrusion 5, and sandwiches the first protrusion 5. The first pressing leg group 10 including the two provided legs 10a and 10b is also pressed toward the circuit board 21. At the position corresponding to the three legs of the E-shaped magnetic core 25, the two legs 10 a and 10 b and the first convex portion 5 press the magnetic core 25. The core 25 can be uniformly and stably fixed. When the magnetic core 25 is pressed, the magnetic core 26 connected to the magnetic core 25 is also pressed against the housing 22.

  The first pressing member 6 extends not only from the first pressing leg group 10 that extends from the fixed portion 8 to one side to press the magnetic core 25 but also extends from the fixed portion 8 to the other side. Is provided, the magnetic cores 25 and 28 of the respective winding components can be pressed down and fixed in a well-balanced manner.

  Next, a heat dissipation path of the power supply device 20 according to the embodiment of the present invention will be described with reference to FIG. FIG. 7 is a cross-sectional view taken along line AA of the power supply device 20 shown in FIG.

  The upper surface of the second convex portion 4 provided on the support 2 is in contact with the case 40, whereby the second convex portion 4 and the case 40 are physically and thermally connected. The lower surface of the I-shaped magnetic core 26 of the transformer 23 and the I-shaped magnetic core 29 of the resonance inductor 24 is directly attached to the base plate 31 of the housing 22 or via an adhesive member such as a thermal compound. They are arranged in surface contact. The housing 22 and the case 40 form the outer shape of the power supply device 20 and have a function of radiating heat generated in each element of the power supply device 20 to the outside.

  Next, a heat radiation path generated by the transformer 23 which is a heat generating component will be described. Heat generated from the transformer 23 passes through the first protrusion 5, the support 2, and the second protrusion 4 that are in contact with the magnetic core 25, and is radiated upward from the case 40. A route is secured. The magnetic material core 25, the magnetic material core 28, and the pattern coil 27 are respectively thermally and physically connected to the first pressing leg group 10, the second pressing leg group 11, and the third pressing leg. A leg 12 is provided. Accordingly, the heat from the transformer 23, the pattern coil 27, and the resonance inductor 24 passes through the pressing leg, the support 2, and the second convex portion 4, and secures a second heat radiation path for radiating heat upward from the case 40. are doing.

  In addition, a third heat radiating path for radiating heat from the transformer 23 and the resonance inductor 24 from the magnetic cores 26 and 29 to the base plate 31 of the housing 22 directly or indirectly through a thermal compound or the like. The heat dissipation path is secured.

  A heat transfer member 43 is provided between the circuit board 21 and the base plate 31 at a position where the third pressing leg and the pattern coil 27 are in contact with each other. Thus, a fourth heat radiation path for releasing heat from the pattern coil 27 from the base plate 31 via the heat transfer member 43 is secured.

  In addition, a fifth heat dissipation path for transferring the heat transferred to the support 2 to the housing 22 via the screws and the bosses 42 and dissipating the heat is secured. By providing the plurality of heat radiation paths, heat generated from the transformer 23 and the resonance inductor 24 can be efficiently radiated to the outside.

  Further, the support 2 provided with the second protrusion 4 and the first protrusion 5 and the first pressing member 6 and the second pressing member 7 having the legs are connected as the support 1. . Therefore, since the support member 1 may be disposed at a desired position, the assembly can be performed by a simple method. In addition, as described above, heat generation of the heat generating components such as the transformer 23 and the resonance inductor 24 is suitably performed, and these heat generating components are firmly fixed to the circuit board 21 or the housing 22. The member 1 and the power supply device 20 can be provided.

  As described above, the support member 1 and the power supply device 20 according to one embodiment of the present invention have been described. However, the present invention is not limited to the above-described embodiment, and various modifications can be made.

  For example, the transformer 23 and the primary-side resonance inductor 24 have been described as the winding parts. However, the present invention is not limited thereto. For example, the present invention can be applied to any winding part such as an inductor forming a secondary-side smoothing circuit. It is possible.

In addition, although the description has been given by taking the winding component as an example of the heat generating component, the present invention is also applicable to a heat generating component such as a diode or an FET (Field Effect Transistor) provided in a primary-side switching element or a rectifier circuit.

  Further, for example, a heat dissipating member such as a fin may be added to the lower surface of the base plate 31 so that the power supply device 20 can dissipate heat more efficiently.

DESCRIPTION OF SYMBOLS 1 ... Support member, 2 ... Support tool, 3 ... Press member, 4 ... Second convex portion, 5 ... First convex portion, 6 ... First press member , 7 ... second pressing member, 8, 9 ... fixed part, 10 ... first pressing leg group, 11 ... second pressing leg group, 12 ... third pressing Legs, 20 power supply device, 21 circuit board, 22 housing, 23 transformer, 24 resonant inductor, 25, 26, 28, 29 magnetic core, 27, 30 ... pattern coil, 31 ... base plate, 32 ... side wall, 33, 34, 35, 36, 37, 38 ... opening, 39 ... hole

Claims (5)

A first protrusion protruding toward the substrate and thermally connected to the first heat-generating component; and protruding in a direction opposite to the first protrusion and thermally connected to a housing that houses the substrate. A support having a second convex portion;
A pressing member fixed to the support, for pressing the first heat generating component or a second heat generating component different from the first heat generating component in the board direction ;
The first heat generating component has at least a winding component,
The substrate includes a pattern coil included in the winding component,
The pressing member,
Pressing the core of the winding component toward the substrate,
Support member, wherein Rukoto comprises a third pressing legs for pressing the pattern coil in the housing.       The support member according to claim 1, wherein the first convex portion and the second convex portion are formed of a single plate-shaped member. The core has a longitudinal direction and a lateral direction,
The first convex portion presses a substantially central portion of the core in the longitudinal direction toward the substrate,
The pressing member has at least two legs,
The said leg part is arrange | positioned at the both ends of the said longitudinal direction of the said core so that the said 1st convex part may be interposed, and presses the said core toward the said board | substrate, The Claims 1 or 2 characterized by the above-mentioned. Support member. The winding component includes a first winding component and a second winding component,
The pressing member presses the first core of the first winding component toward the substrate by a first pressing leg group extending from the center to one side, and a second pressing leg group extending to the other side. support member according to claim 1, wherein pressing the second core comprising said second winding parts to the substrate direction by. A power supply device comprising the support member according to any one of claims 1 to 4 .

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