JPWO2016027317A1 - Power converter - Google Patents

Abstract

A case (10) that constitutes a heat sink, and a cover that constitutes the apparatus main body 1 together with the case (10), and that stores a plurality of substrates (40) stacked in a storage space 2 formed therein in a state of being separated from each other. (20) In the power converter provided with (20), the holding | maintenance which mounts the edge part of a board | substrate (40) directly or indirectly arrange | positioned in the case (10) in the aspect which faces storage space (2) A guide (30) having a portion (33, 37), and the guide (30) includes a second substrate (42) and a third substrate in which at least one substrate (40) is disposed between the guide (30) and the case (10). A part of the edge part of the substrate (43) is placed on the holding part (33, 37) to hold at least a part of the second substrate (42) and the third substrate (43).

Description

  The present invention relates to a power conversion device used in the control of, for example, an elevator or an air conditioner.

  2. Description of the Related Art Conventionally, as a power conversion device used in, for example, control of an elevator or an air conditioner, for example, the one proposed in Patent Document 1 is known.

  In the power conversion device proposed in Patent Document 1, a plurality of support bases are erected so as to be dispersed in the peripheral region of the board mounting surface in the first case constituting the heat sink. In addition, a plurality of presser pieces are formed on the inner peripheral surface of the cylindrical second case that is stacked on the first case and constitutes the apparatus main body so as to protrude inward. Then, by arranging the second case so as to be stacked on the first case, the substrate on which various circuits are mounted in the storage space formed inside the apparatus main body is sandwiched between the support base and the pressing piece. It is stored like this.

JP 2012-164843 A

  By the way, in a power converter, it is general that a plurality of substrates are stacked in a state of being separated from each other and stored in a storage space in response to a request for downsizing or the like. Therefore, as in the power conversion device proposed in Patent Document 1 described above, each substrate is supported by a support base that is erected on the first case and a pressing piece that is formed on the second case. Then, there were the following problems.

  That is, among a plurality of substrates, a substrate (hereinafter also referred to as a second substrate) in which at least one substrate (hereinafter also referred to as a first substrate) is disposed between the substrate mounting surface of the first case is supported. When supporting so that it may pinch | interpose with a base and a pressing piece, the support base for supporting a 2nd board | substrate will pass the area | region where a 1st board | substrate is arrange | positioned. Therefore, it is necessary to form a cutout in the first substrate for a support pedestal for supporting the second substrate to pass therethrough. As a result, the mounting area of components and circuit patterns on the first substrate is reduced. There was a fear of it. This problem becomes more prominent as the number of first substrates increases, and the closer the substrate is to the first case, the larger the notch area.

  Also, when the second substrate is fixed via the spacer attached to the first substrate, the components and circuit patterns mounted on the first substrate should avoid the spacer for fixing the second substrate, as described above. As a result, there is a possibility that the mounting area of components and circuit patterns on the first substrate may be reduced.

  Further, when the first substrate and the second substrate are fixed with a metal spacer, there is a problem that the insulation distance is restricted.

  In view of the above circumstances, an object of the present invention is to provide a power converter that can suppress a reduction in the mounting area of a substrate.

  In order to achieve the above object, a power conversion device according to the present invention comprises a case constituting a heat sink, a device main body together with the case, and a plurality of substrates separated from each other in a storage space formed therein. It is related with the power converter device provided with the cover accommodated by laminating | stacking. A guide is provided directly or indirectly on the case so as to face the storage space, and having a holding portion on which the edge portion of the substrate is placed. The guide holds at least a part of the target substrate by placing a part of the edge portion of the target substrate on which at least one substrate is disposed between the guide and the case on the holding unit. And

  According to the present invention, in the power conversion device, a case side substrate closest to the case among the substrates is fastened and fixed so that the mounted power semiconductor module is thermally connected to the case. It is. The guide includes a restricting portion that restricts displacement of the case-side substrate so as to be separated from the case.

  In the power conversion device according to the present invention, the guide has a positioning hole that allows a protrusion formed on an edge of the target substrate held by the holding portion to enter.

  According to the present invention, in the power conversion device, the guide is displaced so that the target substrate held by the holding unit is separated from the case by causing a regulation protrusion formed on the cover to enter. It has a regulation groove part which accepts that the regulation projection part regulates.

  According to the present invention, in the power conversion device, the guide holds the target substrate by placing a part of a pair of edge ends of the target substrate facing each other on the holding unit. Features.

  In the present invention, the guide is provided directly or indirectly on the case so as to face the storage space, and having a holding portion on which the edge portion of the substrate is placed. A part of the edge portion of the target substrate on which at least one substrate is disposed between the guide and the case is placed on the holding unit to hold at least a part of the target substrate. This avoids a support pedestal or boss for holding the target substrate at a position corresponding to at least a portion of the target substrate held by the holding portion of the guide on the substrate arranged on the case side of the target substrate. It is not necessary to provide a notch for the purpose. Therefore, according to the present invention, it is possible to suppress the reduction of the mounting area of the substrate.

FIG. 1 is a front view showing an internal structure with some components of the power conversion device according to the embodiment of the present invention omitted. FIG. 2 is a longitudinal sectional view of a main part of the power conversion device according to the embodiment of the present invention. FIG. 3 is a perspective view for illustrating a mounting state of a main part of the power conversion device according to the embodiment of the present invention. FIG. 4 is a perspective view of the guide. FIG. 5 is a perspective view of the guide. 6 is a longitudinal sectional view of a main part of the power conversion device according to the embodiment of the present invention, and is a sectional view of a portion different from FIG. FIG. 7 is a longitudinal cross-sectional view of a main part of the power conversion device according to the embodiment of the present invention, and is a cross-sectional view of a portion different from FIGS. 2 and 6. FIG. 8 is a vertical cross-sectional view of a main part of the power conversion device according to the embodiment of the present invention, and is a cross-sectional view of a portion different from FIGS. 2, 6, and 7.

  Exemplary embodiments of a power conversion device according to the present invention will be described below in detail with reference to the accompanying drawings.

  1 and 2 each show a power conversion device according to an embodiment of the present invention. FIG. 1 is a front view showing an internal structure with some components omitted, and FIG. FIG. The power conversion device illustrated here is used for controlling an electric motor that drives, for example, an elevator or an air conditioner, and includes a device main body 1 that is a casing. In the following description, for the sake of convenience, the apparatus main body 1 is placed sideways (see FIG. 3), and the front, rear, left, and right sides are used. However, the power conversion device illustrated here is the rear of the apparatus main body 1. It is installed on the surface of the board and so on.

  The apparatus main body 1 has a case 10 and a cover 20. The case 10 is formed by extrusion molding a material having good thermal conductivity such as aluminum or aluminum alloy, and constitutes a heat sink. The case 10 includes a fin unit 11 and a fan 12.

  The fin unit 11 includes a base 11a and a plurality of fins 11b. The fin unit 11 is formed by aluminum extrusion molding or caulking fins that caulk the plurality of fins 11b to the base 11a. The base 11a has a substantially flat plate shape. A plurality of fastening holes 111 (see FIG. 3) are formed in the central region of the base 11a. In addition, thermal grease having excellent heat conductivity is applied to the central region of the base 11a.

  Each of the plurality of fins 11b has a thin plate shape. These fins 11b are arranged in a standing posture so that each fin 11b is arranged in the left-right direction in such a manner that each fin extends along the front-rear direction on the lower surface of the base 11a.

  The fan 12 is disposed in front of the fin unit 11. The fan 12 is driven to introduce outside air into the case 10 through the opening 13 formed on the front side of the case 10 and pass between the fins 11 b of the fin unit 11. It is for discharging outside through an opening (not shown) formed on the rear side.

  The cover 20 is formed of, for example, a resin material such as plastic, and is attached to the case 10 to define a storage space 2 in which a plurality of substrates 40 are stored. The cover 20 includes a bottom cover 20a and a top cover 20b.

  As shown in FIG. 3, the bottom cover 20 a is attached to the case 10 with fixing screws 50 so that the bottom 21 covers the upper surface of the case 10. More specifically, the bottom cover 20a is attached to the case 10 with a fixing screw 50 so that the bottom 21 covers the upper surface of the case 10 with a watertight material (not shown) such as an O-ring or packing appropriately interposed therebetween. It has been. The bottom cover 20a restricts water from entering the storage space 2 from the case 10.

  An attachment opening 22 and a wall portion 23 are provided in the bottom portion 21 of the bottom cover 20a. The attachment opening 22 has a substantially rectangular shape, and is formed at a location corresponding to the base 11 a of the fin unit 11. The attachment opening 22 exposes the central region of the base 11a.

  The wall portion 23 extends upward at the edge of the bottom portion 21 so as to surround the bottom portion 21. These wall portions 23 are formed so that their upper end portions are located on the same plane, although the extending lengths in the vertical direction differ depending on the height level of the bottom portion 21. A connecting projection 24 and a mounting hole 25 are formed in a pair of the left wall portion 23a and the right wall portion 23b facing each other in the wall portion 23.

  There are two connecting projections 24 on the left wall portion 23a and the right wall portion 23b in the front and rear portions, and are formed to protrude outward in the vicinity of the upper end edges of the left wall portion 23a and the right wall portion 23b. These connection protrusions 24 are for connecting the top cover 20b to the bottom cover 20a.

  The attachment hole 25 has a rectangular shape formed on the lower side than the connection protrusion 24. The mounting holes 25 are a pair of front and rear, and are provided on the front side and the rear side of the left wall portion 23a and the right wall portion 23b. That is, four attachment holes 25 are formed in each of the left wall portion 23a and the right wall portion 23b. These mounting holes 25 are for mounting the guide 30.

  The guides 30 are plate-like members formed of a resin material such as plastic, for example. Two guides 30 are disposed on the left wall portion 23a and the right wall portion 23b so as to face the storage space 2.

  4 and 5 are perspective views showing the guide 30 attached to the right wall portion 23b. Here, the four guides 30 all have the same shape, and the guide 30 attached to the left wall portion 23a is attached with the guide 30 attached to the right wall portion 23b opposite in the front-rear direction and the left-right direction. ing.

  As shown in FIGS. 4 and 5, the guide 30 includes an attachment piece 31, a restriction portion 32, a first holding portion 33, a restriction groove portion 34, a restriction rib 35, a positioning hole 36, a second holding portion 37, and a positioning purpose. A projection 38 is provided.

  A plurality (two in the illustrated example) of the attachment pieces 31 are provided. These mounting pieces 31 are tongue-like portions extending downward from the upper edge of the rectangular opening so as to substantially close the rectangular opening formed at the lower end of the guide 30. The mounting piece 31 is formed with a mounting projection 31a projecting rightward at the lower end portion thereof.

  The restricting portion 32 is formed by a portion extending along the front-rear direction and protruding toward the left in the upper region of the attachment piece 31. The first holding portion 33 is formed by a portion extending along the front-rear direction and protruding toward the left in the upper region of the restricting portion 32. The restriction groove 34 is formed in the upper region of the first holding part 33, and reaches from the upper end part of the guide 30 to the first holding part 33 so that a part of the upper surface of the first holding part 33 becomes the bottom part 21. It is a groove-shaped part.

  A plurality of (two in the illustrated example) restriction ribs 35 are provided. One regulating rib 35 is formed by a portion protruding leftward so as to extend along the vertical direction at the rear end portion of the upper region of the first holding portion 33. The other regulating rib 35 is formed by a portion protruding leftward so as to extend along the vertical direction on the front side of the regulating groove 34 in the upper region of the first holding portion 33. A gap larger than the thickness of the substrate 40 is formed between the regulating rib 35 and the first holding portion 33.

  The positioning hole 36 has a rectangular shape formed on the rear side of the restriction groove portion 34 in the upper region of the first holding portion 33. The second holding portion 37 is formed by a portion that extends along the front-rear direction and protrudes leftward at the upper end portion of the guide 30. The second holding portion 37 is divided into front and rear portions by the restriction groove portion 34, and an inclined surface that gradually approaches the restriction groove portion 34 is formed in the vicinity of the restriction groove portion 34 in the downward direction. On the rear side of the restriction groove portion 34 in the second holding portion 37, a restriction protrusion wall 39 whose front end portion forms the inclined surface is formed so as to extend in the front-rear direction. The positioning protrusion 38 is formed so as to protrude upward on the front side of the restriction groove 34 in the second holding portion 37. Here, the height of the restricting protruding wall 39 and the positioning protrusion 38 protruding upward from the second holding portion 37 is adjusted to be slightly larger than the thickness of the substrate 40.

  In such a guide 30, the attachment piece 31 enters the pair of front and rear attachment holes 25 from the inside of the wall portion 23, and is sandwiched between the attachment rib 26 provided on the bottom portion 21 of the bottom cover 20 a and the wall portion 23. Thus, as shown in FIG. 3, two are provided on each of the left wall portion 23a and the right wall portion 23b. In FIG. 3, it seems that the guide 30 is disposed before the substrate 40 is disposed. In practice, however, the guide 30 has the substrate 40 closest to the case 10 as described later. After being disposed, the guide 30 is disposed.

  The top cover 20b is a substantially rectangular box whose bottom surface is open. Connection holes (not shown) are formed in the lower left and right side surfaces of the top cover 20b, and the top cover 20b is moved to the bottom by allowing the connection protrusions 24 of the bottom cover 20a to enter the connection holes. The upper portion of the cover 20a is connected to be closed, and the storage space 2 is defined inside.

  The top cover 20b is provided with a first restricting protrusion 28 (see FIG. 7) and a second restricting protrusion 29 (see FIG. 8). When the top cover 20b is connected to the bottom cover 20a, the first restriction protrusions 28 are provided at locations corresponding to the restriction groove portions 34 of the guide 30 disposed on the bottom cover 20a.

  The front and rear widths of the first restriction protrusions 28 are smaller than the front and rear widths of the restriction groove parts 34, and can enter the restriction groove parts 34 from above when the top cover 20b is connected to the bottom cover 20a. Note that when the first restricting protrusion 28 enters the restricting groove 34, the vertical dimension thereof is adjusted so that a gap whose distance from the first holding portion 33 is larger than the thickness of the substrate 40 is formed. Has been.

  When the top cover 20b is connected to the bottom cover 20a, the second restriction protrusion 29 is provided at a location corresponding to the restriction protrusion wall 39 of the guide 30 disposed on the bottom cover 20a. The second restricting protrusion 29 has a lower surface that can contact the upper surface of the restricting protrusion wall 39 when the top cover 20b is connected to the bottom cover 20a.

  A plurality (three in the illustrated example) of substrates 40 are disposed in the storage space 2 defined by attaching the cover 20 to the case 10. The substrates 40 are stacked and stored in the storage space 2 so as to be separated from each other, and semiconductor elements, circuits, and the like are mounted on the substrates 40, respectively. A power semiconductor module 44 such as an IGBT element is mounted on the lower surface of a first substrate (case-side substrate) 41 located at the lowermost position among these substrates 40 and closest to the case 10. In the following, what is stacked above the first substrate 41 is referred to as a second substrate (target substrate) 42, and the substrate 40 stacked above the second substrate 42 is referred to as a third substrate (target substrate). This will be described as 43.

  In the power conversion device according to the present embodiment, the first substrate 41, the second substrate 42, and the third substrate 43 are stored in the storage space 2 as follows.

  The first substrate 41 is placed on the central region of the base 11a of the fin unit 11 so that the power semiconductor module 44 mounted on the lower surface passes through the mounting opening 22, and is fastened to the base 11a by a fastening member (not shown). It is arranged by doing. Thereby, the power semiconductor module 44 is thermally connected to the base 11a (fin unit 11). Moreover, as shown in FIG. 6, a part of edge part of the 1st board | substrate 41 is mounted and supported by the support rib 27 standingly arranged by the bottom part 21 of the bottom cover 20a.

  After the first substrate 41 is thus disposed, the guide 30 is disposed on the wall portion 23 (the left wall portion 23a and the right wall portion 23b) of the bottom cover 20a. By arranging the four guides 30 on the wall portion 23 in this way, the restricting portion 32 of the guide 30 is positioned above the edge portion of the first substrate 41 as shown in FIG. As a result, even if the first substrate 41 is displaced upward, a part of the edge portion comes into contact with the lower surface of the restricting portion 32 and the displacement is restricted. Therefore, the guide 30 can restrict the displacement of the first substrate 41 from the case 10 through the restricting portion 32.

  The second substrate 42 is placed and disposed on the upper surface of the first holding portion 33 of the guide 30 corresponding to a part of the edge portion. In this case, a projection (not shown) formed at the edge of the second substrate 42 enters the positioning hole 36 of the guide 30, so that the second substrate 42 is positioned at a desired location by the guide 30. It is decided.

  Since the gap between the first holding portion 33 and the regulating rib 35 in the guide 30 is larger than the thickness of the substrate 40, the edge of the second substrate 42 enters between the first holding portion 33 and the regulating rib 35. Thus, the amount of vertical displacement of the second substrate 42 before the top cover 20b is connected to the bottom cover 20a is regulated to some extent by the first holding portion 33 and the regulating rib 35.

  Further, by connecting the top cover 20b to the bottom cover 20a, the first restriction protrusion 28 of the top cover 20b enters the restriction groove 34, and as shown in FIG. Is sandwiched between the first holding portion 33 and the first restricting protrusion 28, and displacement in the vertical direction is restricted. Thereby, the guide 30 can hold a part of the second substrate 42 while restricting the displacement of the second substrate 42 in the vertical direction.

  The third substrate 43 is placed on the upper surface of the second holding portion 37 of the guide 30 corresponding to a part of the edge portion. In this case, the third substrate 43 is positioned by the guide 30 when the positioning protrusion 38 relatively enters a recess (not shown) formed at the edge of the third substrate 43.

  Then, by connecting the top cover 20b to the bottom cover 20a, the lower surface of the second restricting protrusion 29 of the top cover 20b is brought into contact with the upper surface of the restricting protrusion wall 39, and as shown in FIG. A part of the edge part of 43 is pinched | interposed into the 2nd holding | maintenance part 37 and the 2nd control protrusion 29, and the displacement to an up-down direction is controlled. Accordingly, the guide 30 can hold a part of the third substrate 43 while restricting the displacement of the third substrate 43 in the vertical direction.

  As described above, in the power conversion device according to the embodiment of the present invention, the wall portion 23 (the left wall portion 23a and the right wall portion 23b) of the bottom cover 20a is disposed so as to face the storage space 2. The guide 30 places a part of the edge of the second substrate 42 on the first holding part 33 to hold a part of the second substrate 42, and the second holding part 37 holds the third substrate 43. A part of the edge portion is placed and a part of the third substrate 43 is held. This avoids a support pedestal or boss for holding the second substrate 42 at a position corresponding to at least the portion of the second substrate 42 held by the first holding portion 33 of the guide 30 in the first substrate 41. There is no need to provide a notch for this purpose. Further, a support pedestal for holding the third substrate 43 is provided at a position corresponding to at least a portion of the third substrate 43 held by the second holding portion 37 of the guide 30 in the first substrate 41 and the second substrate 42. There is no need to provide a notch for avoiding a boss or the like. Therefore, according to the power converter device which is an embodiment of the present invention, reduction of the mounting area of substrate 40 can be controlled.

  Furthermore, since the first to third substrates 41, 42, 43 can be held on the guide 30 without using screws, a plurality of substrates are stacked in the storage space 2 inside the apparatus body 1 while being separated from each other. Even when housed, the board can be fixed by the screwless method. In order to reinforce the fixing of the substrate, a part of the substrate may be fixed with screws, and in this case, the number of screws used can be reduced.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to this, and various modifications can be made.

  In the embodiment described above, the guide 30 is disposed on the bottom cover 20b constituting the cover 20, but in the present invention, the guide may be disposed on the case.

  In the above-described embodiment, the guide 30 is disposed on the left wall portion 23a and the right wall portion 23b facing each other, and part of the edge portions of the second substrate 42 and the third substrate 43 facing each other. However, in the present invention, the guide is configured to hold a part of the target substrate (the second substrate 42 and the third substrate 43). As long as it can be held, the arrangement location and the like are not particularly limited.

DESCRIPTION OF SYMBOLS 1 Apparatus main body 2 Storage space 10 Case 11 Fin unit 12 Fan 11a Base 11b Fin 20 Cover 20a Bottom cover 20b Top cover 21 Bottom part 22 Attachment opening 23 Wall part 24 Connection protrusion 25 Attachment hole 30 Guide 31 Attachment piece 32 Restriction part 33 1st Holding part 34 Restriction groove part 35 Restriction rib 36 Positioning hole 37 Second holding part 38 Positioning protrusion 39 Locking protrusion wall 40 Substrate 41 First substrate 42 Second substrate 43 Third substrate 44 Power semiconductor module

Claims (5)

A case constituting a heat sink;
A power conversion device comprising: a cover that forms a device main body together with the case, and stores and stacks a plurality of substrates in a storage space formed inside the device in a state of being separated from each other;
A guide having a holding portion that is disposed directly or indirectly on the case in a manner facing the storage space and on which an edge portion of the substrate is placed;
The guide holds at least a part of the target substrate by placing a part of an edge portion of the target substrate on which at least one substrate is arranged between the guide and the case on the holding unit. A power converter. Of the substrates, the case side substrate closest to the case is fastened and fixed so that the mounted power semiconductor module is thermally connected to the case,
The power converter according to claim 1, wherein the guide includes a restricting portion that restricts the case-side substrate from being displaced away from the case.   The power converter according to claim 1, wherein the guide has a positioning hole that allows a protrusion formed at an edge of the target substrate held by the holding unit to enter.   The guide allows the restriction protrusion to restrict the target substrate held by the holding part from being displaced away from the case by causing the restriction protrusion formed on the cover to enter. The power converter according to claim 1, further comprising a regulation groove.   The power conversion according to claim 1, wherein the guide holds the target substrate by placing a part of a pair of edge portions of the target substrate facing each other on the holding portion. apparatus.

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