JP2013162541A - Electric power conversion system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology relating to an electric power conversion system which supports a lamination cooling unit with an elastic member and inhibiting variations in lengths of the elastic members due to variations in lengths of the lamination cooling units.SOLUTION: An electric power conversion system includes: a lamination cooling unit 2; a base plate 10 for attaching the lamination cooling unit; a spring 21 biasing the lamination cooling unit 2 between stopper parts 12, 13 of the base plate 10; and spacers 22, each of which is inserted between the stopper part 13 and the spring 21. Protruding parts, having different protruding lengths, are respectively provided on both surfaces of the spacer 22. Case side recessed parts 13a, each of which is a recessed part fitted with the protruding part and has a depth that is equal to or smaller than the maximum length of the spacer side protruding part and is equal to or larger than the minimum length of the spacer side protruding part, are respectively provided on spacer contact surfaces of the stopper parts 13.

Description

  The technology disclosed in this specification relates to a power conversion device such as an inverter or a voltage converter.

  In an inverter that supplies electric power to a motor or a voltage converter that converts a voltage, a structure in which semiconductor elements having a large amount of heat, such as an IGBT, are integrated separately from other circuits and intensively cooled may be employed. As one of such integrated structures, a stacked cooling unit is known in which flat-plate semiconductor modules containing semiconductor elements having a large calorific value and flat-plate coolers are alternately stacked.

  The stacked cooling unit is attached to the base plate in a state where pressure is applied in the stacking direction so that heat is well transferred from the semiconductor module to the cooler. Here, the base plate is a structure that supports the stacked cooling unit, and may typically be a part of the case of the power conversion device. In order to apply pressure to the multilayer cooling unit, the multilayer cooling unit is disposed between a pair of stopper portions (a part of the case, such as a wall of a case or a column, and directly supporting the multilayer cooling unit) provided on the base plate. An elastic member (spring) is inserted between the portion and one end in the stacking direction of the stacked cooling unit. Such a structure is disclosed in Patent Documents 1 to 3, for example.

JP 2009-027805 A JP 2010-130814 A JP 2011-211853 A

  When a large number of semiconductor modules and coolers are stacked, the stacked cooling unit has a large variation in length in the stacking direction. Therefore, the gap width into which the elastic member is inserted varies. Variation in the gap width causes variation in the length of the elastic member, that is, variation in the pressing force applied to the stacked cooling unit. In order to suppress the variation in the pressing force, a technique for compensating for the variation in the gap width is required. For example, Patent Document 2 discloses a technique in which a plate spring is employed as an elastic member, and the position of a pin that supports the end portion of the plate spring and that corresponds to the stopper portion can be adjusted. Specifically, the technique of Patent Document 1 provides a plurality of depressions with different distances from the end face of the stacked cooling unit on the inner wall of the case corresponding to the above base plate, and selects the depressions into which the pins are fitted. Adjust the mounting position. The present specification provides a technique for compensating for the gap width variation with a simpler structure than the technique of Patent Document 1.

  In the technology disclosed in this specification, an elastic member is disposed between a stopper portion provided on a base plate and an end surface of the stacked cooling unit, and a spacer for adjusting the gap width between the elastic member and the stopper portion is provided. Arrange. The spacer is provided with spacer-side convex portions having different protrusion lengths on the stopper portion contact surface and the elastic member contact surface. A case-side recess that is a recess that fits with the spacer-side protrusion on the spacer abutment surface of the stopper portion provided on the base plate, the depth of which is less than the maximum length of the spacer-side protrusion and greater than or equal to the minimum length. Is provided. By adopting such a spacer and stopper part, when the convex part with the longer protruding length is fitted into the concave part, and when the convex part with the shorter protruding length is fitted into the concave part, Thus, it is possible to change the length from the stopper portion to the tip of the spacer (the tip of the convex portion that is not fitted). That is, the gap width into which the elastic member is inserted can be adjusted. This technique has the advantage that the gap width can be easily adjusted simply by changing the orientation of the spacer.

  The above-described advantages can be obtained even if a concave portion is provided on the spacer side and a convex portion is provided on the stopper side. That is, a plurality of spacer-side recesses having different depths are provided on both surfaces of the spacer, and a protrusion that fits into the spacer-side recess on the spacer contact surface of the stopper portion, the protrusion length of which is the maximum depth of the spacer-side recess. A case-side convex portion that is less than or equal to the minimum depth and greater than the minimum depth may be provided. The distance from the stopper to the tip of the spacer (the surface opposite to the surface in contact with the stopper) can be adjusted depending on which spacer-side recess with different depth is fitted to the stopper-side protrusion. .

  Details of the technology disclosed in this specification and further improvements will be described in the embodiments of the present invention.

It is the top view and side view of a lamination | stacking cooling unit with which the power converter device (inverter) of 1st Example is provided. FIG. 2A is a plan view of the spacer of the first embodiment. 2B shows a plan view when the longer convex portion 23a is fitted into the concave portion 13a, and FIG. 2C is a plan view when the shorter convex portion 23b is fitted into the concave portion 13a. The figure is shown. It is a top view of a lamination | stacking cooling unit when the shorter convex part 23b is fitted to the recessed part 13a. FIG. 4A is a plan view of the spacer of the second embodiment. 4B shows a plan view when the deeper concave portion 227a is fitted to the convex portion 216, and FIG. 4C is a plan view when the shallow concave portion 227b is fitted to the convex portion 216. The figure is shown. FIG. 5A is a plan view of the spacer of the third embodiment. FIGS. 5B to 5E are plan views when the convex portions provided on the four surfaces of the spacer are fitted into the concave portions 313a. FIG. 6 shows a plan view of the spacer and the stacked cooling unit of the fourth embodiment. 6A shows a plan view when the longer convex portion 423a is fitted into the concave portion 13a, and FIG. 6B shows a plan view when the shorter convex portion 423b is fitted into the concave portion 13a. The figure is shown. It is a top view when the longer convex part 523a is fitted to the deeper concave part 513a. It is a top view when the longer convex part 523a is fitted to the shallower concave part 513b. It is a top view when the shorter convex part 523b is fitted to the shallower concave part 513b.

The technical features of the examples are listed below. In addition, the following techniques each exhibit technical usefulness independently or in combination.
(1) The inverter (corresponding to an example of a power conversion device) includes a stacked cooling unit 2, a base plate 10, a spring 21 (elastic member), and a spacer 22. The stacked cooling unit 2 is a structure in which flat plate type semiconductor modules 4 containing semiconductor elements and flat plate type coolers 3 are alternately stacked. The base plate 10 is a component in which a pair of stopper portions 12 and 13 are erected and the stacked cooling unit 2 is attached between the pair of stopper portions. The base plate 10 is incorporated in the inverter case. The spring 21 is inserted between one stopper portion 13 and the end face of the multilayer cooling unit 2, and biases the multilayer cooling unit 2 toward the other stopper portion 12. The spacer 22 is inserted between the one stopper portion 13 and the spring 21. Spacer-side convex portions 23a and 23b having different projecting lengths are provided on both surfaces of the spacer 22, respectively. The spacer contact surface of the stopper portion 13 is provided with a case-side recess 13a that is a recess that fits with the spacer-side protrusion, the depth of which is not more than the maximum length of the spacer-side protrusion and not less than the minimum. Yes. In another embodiment, a plurality of spacer-side recesses having different depths are provided on both surfaces of the spacer, and the spacer contact surface of the stopper portion is a protrusion that fits into the spacer-side recess. A case-side convex portion having a protruding length that is equal to or smaller than the spacer-side concave maximum depth and a minimum depth is provided.

  (2) A spacer-side convex portion having a different protruding length is provided on each of both surfaces of the spacer, and a concave portion that fits the spacer-side convex portion on the spacer contact surface of the stopper portion, the depth of which is the spacer side A case-side recess having a length not larger than the maximum length of the convex portion and not less than the minimum length is provided. And the spacer contact surface of the stopper part is provided with a plurality of recesses having different depths so that one spacer-side protrusion can be selectively fitted (see FIG. 7). Even if it is the same spacer side convex part, by selecting the concave part to be fitted, the distance from the stopper part to the spacer tip (tip of the convex part on the non-fitting side), that is, the gap width for inserting the spring 21 Can be changed.

  (3) The spring is a leaf spring. The stopper portion is provided with a case-side concave portion or a case-side convex portion having the same shape at a position corresponding to each of both ends of the leaf spring. If the stopper is provided with a case-side recess, the spacer has two spacer bodies with spacer-side protrusions that fit into the two case-side recesses. It has the connection part which connects two spacer main bodies so that a part may become the same direction. Or when the case side convex part is provided in the stopper part, the spacer is the spacer side of the same depth as the two spacer main bodies in which the spacer side concave part fitted to each of the two case side convex parts is formed. It has the connection part which aligns and connects two spacer main bodies so that a recessed part may become the same direction (refer FIG. 6, FIG. 7).

  A power converter according to a first embodiment will be described with reference to the drawings. The power converter of the embodiment is an inverter that is mounted on an electric vehicle and converts DC power of a battery into AC power for driving a motor. The inverter includes a large number of semiconductor elements that handle a large current, such as IGBTs and diodes (reflux diodes). Unlike the circuit for digital signals, these elements pass a current of several tens to several hundreds of amperes, and thus generate a much larger amount of heat than the circuit for digital signals. In view of this, the inverter includes a stacked cooling unit in which semiconductor elements such as IGBTs having a large amount of heat generation are separated and integrated from a digital signal circuit. FIG. 1 shows a laminated cooling unit 2 and a base plate 10 to which the laminated cooling unit 2 is attached. FIG. 1A shows a plan view, and FIG. 1B shows a side view.

  The stacked cooling unit 2 has a structure in which a plurality of flat-plate-type semiconductor modules 4 containing semiconductor elements and a plurality of flat-plate-type coolers 3 are alternately stacked. In FIG. 1, the electrodes extending from the semiconductor module 4 and the wiring connected to the electrodes are not shown. In the flat cooler 3, a liquid refrigerant flows inside. The cooler 3 is connected to adjacent coolers at two locations by connection pipes 5. A refrigerant supply pipe 6 and a refrigerant discharge pipe 7 are connected to the rightmost cooler 3 in FIG. The refrigerant supplied from the refrigerant supply pipe 6 flows to all the coolers 3 through the upper connection pipe 5 in FIG. The refrigerant that has passed through the inside of the cooler 3 is discharged from the refrigerant discharge pipe 7 through the lower connection pipe 5 in FIG. Each semiconductor module 4 is sandwiched between the coolers 3 on both sides, and is efficiently cooled. Hereinafter, for the sake of explanation, of the both ends of the stacked cooling unit 2 in the stacking direction, the end on the side where the refrigerant supply pipe 6 and the refrigerant discharge pipe 7 are attached is referred to as the “rear end” of the stacked cooling unit 2 and The end (the end with which the leaf spring 21 is in contact) is referred to as the “tip”.

  The base plate 10 is a component that fixes the stacked cooling unit 2. The laminated cooling unit 2 is housed in the inverter case (not shown) together with the base plate. The base plate 10 is provided with a pair of stopper portions 12 and 13. The stopper portions 12 and 13 are struts (or walls) for fixing the stacked cooling unit 2 therebetween. As shown in FIG. 1, the stacked cooling unit 2 is disposed so that both ends of the stacking method face each of the pair of stopper portions 12 and 13. The stopper portion 12 supports the rear end of the stacked cooling unit 2. One stopper portion 13 supports the tip of the stacked cooling unit 2, and a leaf spring 21 and a spacer 22 are fitted between the tip of the stacked cooling unit 2 and the stopper portion 13. Further, a pressure dispersion plate 9 is inserted between the leaf spring 21 and the laminated cooling unit 2. The pressure dispersion plate 9 has high rigidity and is provided to widely disperse the pressing force by the leaf spring 21 on the front end surface of the stacked cooling unit 2.

  In FIG. 1, the stopper portions 12 and 13 are shown in gray for easy understanding of the drawing. Moreover, although the recessed part 13a (after-mentioned) provided in the stopper part 13 and the convex part 23a (after-mentioned) fitted with the recessed part 13a should be drawn with a hidden line in FIG. 1, in order to help an understanding, it is a continuous line. Please note that it is drawn in. The same applies to the subsequent drawings.

  The length of the laminated cooling unit 2 including the thickness of the pressure dispersion plate 9 is represented by the symbol L. The distance from the spacer contact surface of the stopper portion 13 to the spacer tip (tip on the side facing the leaf spring 21) is represented by symbol A, and the end surface of the multilayer cooling unit 2 (stacked cooling unit including the pressure distribution plate 9) from the spacer tip. 2, that is, a gap width into which the leaf spring 21 is inserted is denoted by a symbol B. The meanings of the symbols A, B, and L are the same in the following drawings.

  Since the stacked cooling unit 2 is a stacked body of a large number of semiconductor modules 4 and coolers 3, the length L varies from solid to solid. On the other hand, the distance between the pair of stopper portions 12 and 13 (corresponding to length A + length B + length L in FIG. 1) is constant. Therefore, the width B of the gap in which the leaf spring 21 is accommodated varies. The spacer 22 plays a role of adjusting the gap width B so that the variation in the gap width (the width indicated by the symbol B in FIG. 1) into which the leaf spring 21 is inserted is smaller than the variation in the stacked cooling unit 2.

  FIG. 2 shows a partially enlarged view of the spacer 22, the stopper portion 13, and the leaf spring 21. As shown in FIG. 1A, the stopper portions 13 are provided at two locations corresponding to both ends of the leaf spring 21, but the two stopper portions 13 have the same shape. Therefore, only one stopper portion is shown in the following figure. The spacer 22 includes convex portions (spacer side convex portions) 23a and 23b on both surfaces thereof. The protruding length of the convex portion 23a is H1, and the length of the convex portion 23b is H2. The spacer contact surface of the stopper portion 13 is provided with a concave portion (case side concave portion) 13a that fits with the convex portion 23a or the convex portion 23b. The depth of the recess 13a is D1. In the present embodiment, the depth D1 of the concave portion 13a = the protruding length H1 of the convex portion 23a. Further, the protrusion length H2 of the convex portion 23b = (H1 / 2) = (D1 / 2). In other words, convex portions 23 a and 23 b having different projecting lengths are provided on both surfaces of the spacer 22 (the contact surface with the stopper portion 13 and the contact surface with the leaf spring 21). The spacer contact surface is provided with a case-side recess 13a that fits with the protrusion. The depth D1 of the concave portion 13a is equal to the maximum convex portion length H1 and is larger than the minimum length H2.

  The spacer 22 is used by fitting one of the convex portions 23a and 23b to the concave portion 13a. 2B shows a case where the convex portion 23a is fitted into the concave portion 13a, and FIG. 2C shows a case where the convex portion 23b is fitted into the concave portion 13a. FIG. 1 shows a case where the longer convex portion 23a is fitted into the concave portion 13a. When the convex portion 23a is fitted, the length from the front surface of the stopper portion 13 (the surface facing the stacked cooling unit 2) to the tip of the spacer 22 (tip of the convex portion that is not fitted) is A1. (See FIGS. 1 and 2B). Moreover, when the convex part 23b is fitted, the length from the front surface of the stopper part 13 to the front-end | tip of the spacer 22 is A2 (refer FIG.2 (C) and FIG. 3). As is clear from FIGS. 2B and 2C, A1 <A2. By changing the direction of the spacer 22, the gap width (the length indicated by the symbol B in FIG. 1) into which the leaf spring 21 is inserted can be adjusted. The length of the stacked cooling unit 2 in FIG. 1 is L1, and the length of the stacked cooling unit 2 in FIG. 3 is L2 (<L1). Therefore, for the stacked cooling unit 2 having the length L1, the longer convex portion 23a is fitted into the concave portion 13a, and the distance A from the stopper portion 13 to the spacer tip is shortened (A = A1, FIG. 1, (See FIG. 2B). Conversely, for the stacked cooling unit 2 having a length L2 (<L1), the shorter convex portion 23b is fitted into the concave portion 13a, and the distance A from the stopper portion 13 to the spacer tip is increased (A = A2, FIG. 2 (C), FIG. 3). When the length of the laminated cooling unit 2 is L2, the length A from the stopper portion 13 to the spacer tip is increased by the amount that the length of the laminated cooling unit 2 is shorter than L1. Variation in the gap width B into which the spring 21 is inserted can be suppressed. That is, the variation in the gap width B in which the leaf spring 21 is disposed can be reduced with respect to the variation in the length of the stacked cooling unit 2 only by changing the direction of the spacer 22.

  In this embodiment, the depth 13a of the recess 13a is set to be equal to the maximum length H1 of the protrusion provided on the spacer 22 and larger than the minimum length H2. In order to adjust the gap width B into which the leaf spring 21 is inserted, it is noted that the depth D1 of the recess 13a may be equal to or less than the maximum length of the protrusion of the spacer 22 and not less than the minimum length. I want.

  As described above, the stacked cooling unit 2 varies in length L (L = L1, see FIG. 1) in the stacking direction for each solid. When the length L of the laminated cooling unit 2 is relatively long, the protrusion 23a having a long protruding length is fitted into the recess 13a, and a gap width B for inserting the leaf spring 21 is ensured. Conversely, when the length L of the laminated cooling unit 2 is relatively short (L = L2, see FIG. 3), the convex portion 23b having a short protruding length is fitted into the concave portion 13a and the leaf spring 21 is inserted. The gap width B to be secured is secured.

  The same effect as the first embodiment can be achieved by providing a convex portion (case side convex portion) in the stopper portion and providing a concave portion in the spacer. FIG. 4 shows an enlarged view of the stopper portion 213 and the spacer 222 of the second embodiment. The structure other than the stopper portion 213 and the spacer 222 is the same as that in the first embodiment. That is, the stopper portion and the spacer are provided at positions corresponding to both ends of the leaf spring 21, but only one stopper portion and the spacer are shown in FIG.

  The spacer 222 includes concave portions (spacer side concave portions) 227a and 227b on both surfaces thereof. The depth of the recess 227a is D3, and the depth of the recess 227b is D4 (<D3). The spacer contact surface of the stopper portion 213 is provided with a convex portion 216 (case side convex portion) that fits into the concave portion 227a or the concave portion 227b. The protruding length of the convex portion 216 is H3. In this embodiment, the protrusion length H3 of the convex portion 216 = the depth D3 of the concave portion 227a. Further, the depth D4 of the recess 227b = (D3 / 2) = (H3 / 2). In other words, concave portions 227a and 227b having different depths are provided on both surfaces of the spacer 222, and a case-side convex portion 216 that fits the concave portion is provided on the spacer contact surface of the stopper portion 213. Yes. The protrusion 216 has a protrusion length H3 equal to the recess maximum depth D3 and larger than the minimum depth D4.

  The spacer 222 is used by fitting one of the concave portions 227 a and 227 b to the convex portion 216 of the stopper portion 213. 4B shows a case where the deeper concave portion 227a is fitted to the convex portion 216, and FIG. 4C shows a case where the shallow concave portion 227b is fitted to the convex portion 216. When the concave portion 227a is fitted, the length from the front surface of the stopper portion 213 (the surface facing the stacked cooling unit 2) to the tip of the spacer 222 (tip of the non-fitted convex portion) is A3 ( (See FIG. 4B). When the concave portion 227b is fitted, the length from the front surface of the stopper portion 213 to the tip of the spacer 222 is A4 (see FIG. 4C). As is clear from FIGS. 4B and 4C, A3 <A4. The length A3 or A4 corresponds to the length of the symbol A in FIG. That is, by changing the direction of the spacer 222, the gap width (the length indicated by the symbol B in FIG. 1) into which the leaf spring 21 is inserted can be adjusted according to the length of the stacked cooling unit 2. In this embodiment, the protruding portion 216 has a protruding length H3 equal to the maximum depth D3 of the recessed portion provided in the spacer 222 and larger than the minimum depth D4. In order to adjust the gap width to be adjusted, the protruding length H3 of the convex portion 216 may be equal to or smaller than the maximum depth of the concave portion of the spacer 222 and equal to or larger than the minimum depth.

  The spacer 22 of the first embodiment is provided with convex portions 23a and 23b on each of two opposing surfaces. The spacer may be provided with another convex portion on another surface in addition to the two opposing surfaces. In FIG. 5, the enlarged view of the stopper part 313 and the spacer 322 of 3rd Example is shown. The structure other than the stopper portion 313 and the spacer 322 is the same as that in the first embodiment. That is, the stopper portion and the spacer are provided at positions corresponding to both ends of the leaf spring 21, but only one stopper portion and the spacer are shown in FIG.

  The spacer 322 (spacer main body 322) includes convex portions (spacer side convex portions) 323a and 323b on each of the opposing surfaces. Further, each of the other opposing surfaces is provided with convex portions (spacer side convex portions) 323c and 323d. The protruding lengths of the convex portions 323a and the convex portions 323b facing each other are different. Similarly, the protruding lengths of the convex portions 323c and 323d facing each other are also different. The width of the spacer main body between the convex portions 323a and 323b facing each other is W1, and the width of the spacer main body between another convex portion 323c and the convex portion 323d facing each other is W2 (≠ W1). In addition, the protrusion length of the convex part 323a and the convex part 323c is the same, and the length is the same as the depth of the recessed part 313a (case side recessed part) provided in the stopper part 313. Since the width (W1, W2) of the main body excluding the convex portion of the spacer 322 is different, the length from the stopper portion 313 to the tip of the spacer is varied in four ways depending on which of the convex portions 323a to 323d is fitted into the concave portion 313a It can be adjusted (lengths A5 to A8 in FIG. 5). FIG. 5B shows a case where the convex portion 323a is fitted, and the length to the spacer tip is A5. FIG. 5C shows the case where the convex portion 323b is fitted, and the length to the spacer tip is A6. FIG. 5D shows the case where the convex portion 323c is fitted, and the length to the spacer tip is A7. FIG. 5E shows the case where the convex portion 323d is fitted, and the length to the spacer tip is A8. As is apparent from the figure, A5 <A6 <A7 <A8. In the spacer 322 of the third embodiment, the length from the stopper portion 313 to the tip of the spacer can be adjusted in four ways.

  Next, a fourth embodiment will be described. Up to the third embodiment, individual spacers are arranged at positions corresponding to both ends of the leaf spring 21. The spacer 422 of the fourth embodiment includes spacer bodies 422a and 422b disposed at positions corresponding to both ends of the leaf spring 21, and a connecting portion 424 that connects the two spacer bodies 422a and 422b. (See FIG. 6). Similarly to the spacer 422 of the first embodiment, the spacer main bodies 422a and 422b are convex portions 423a having different projecting lengths that fit into the case side concave portions 13a provided at positions corresponding to both ends of the leaf spring 21, respectively. 423b (spacer side convex part) is provided. The connecting portion 424 connects the two spacer bodies 422a and 422b so that the protruding portions having the same protruding length are in the same direction. FIG. 6 (A) shows a case where the length of the stacked cooling unit 2 is L1, and the convex portion 423a having the longer protruding length is fitted into the concave portion 13a. FIG. 6 (B) The case where the length of the stacked cooling unit 2 is L2 (<L1) and the convex portion 423b having the shorter protruding length is fitted into the concave portion 13a is shown. By selecting a convex portion (423a or 423b) to be fitted to the concave portion 13a of the stopper portion 13 according to the length (L1 or L2) of the stacked cooling unit 2, a gap width (B1, The variation of B2) can be reduced. In addition, this embodiment has an advantage that the assembly can be simplified because the two spacer bodies 422a and 422b are connected so that the protrusions having the same protruding length are in the same direction.

  In the fourth embodiment, the case side recess 13a is provided in the stopper portion, and the spacer side protrusions 423a and 423b are provided in the spacer body. Conversely, it should be noted that the same advantage can be obtained by providing a convex portion (case side convex portion) in the stopper portion and providing a concave portion (spacer side concave portion) in the spacer body.

  A fifth embodiment will be described with reference to FIGS. 7A to 7C. The fifth embodiment is characterized in that the stopper 513 is provided with a plurality of recesses 513a and 513b (case-side recesses) having different depths to be fitted to the spacer-side protrusions. Others are the same as in the fourth embodiment, and a description thereof is omitted. The spacer 522 of the fifth embodiment is composed of two spacer bodies 522a and 522b and a connecting portion 524 that connects them, similarly to the spacer 422 of the fourth embodiment. However, in FIGS. 7A to 7C, reference numerals such as convex portions are omitted from the lower spacer body 522 b. Further, the detailed reference numerals of the stopper portions 513 corresponding to the lower spacer body 522b are also omitted.

  As shown in FIGS. 7A to 7C, the stopper portion 513 provided on the base plate 10 is provided with a plurality of concave portions 513a and 513b (case side concave portions) having different depths on the surface with which the spacer 522 abuts. The depth of any recess is not more than the maximum protrusion length of the protrusion provided on the spacer and not less than the minimum protrusion length. FIG. 7A shows a case where the spacer-side convex portion 523a having the maximum projecting length is fitted into the deeper case-side concave portion 513a. This case corresponds to the case where the length from the stopper portion 513 to the spacer tip is the shortest (A = A3) and the length L3 of the stacked cooling unit 2 is the longest.

  FIG. 7B shows a case where the spacer-side convex portion 523a having the maximum protruding length is fitted into the shallower case-side concave portion 513b. In this case, the length A = A4 from the stopper portion 513 to the spacer tip is longer than A3 described above but shorter than A5 described later, and corresponds to the case where the length L4 of the stacked cooling unit 2 is medium. To do.

  FIG. 7C shows a case where the spacer-side convex portion 523b having the minimum protrusion length is fitted into the shallower case-side concave portion 513b. In this case, the length A = A5 from the stopper portion 513 to the spacer tip is the longest, and this corresponds to the case where the length L5 of the stacked cooling unit 2 is the shortest. That is, the length A from the stopper portion 513 to the spacer tip is A3 <A4 <A5, and each corresponds to the length L3, L4, L5 (L3 <L4 <L5) of the stacked cooling unit 2. The variation in the insertion gap B of the leaf spring 21 is suppressed with respect to the variation in the length of the stacked cooling unit 2.

  Points to be noted regarding the power conversion device described in the embodiment will be described. The spacer 322 described with reference to FIG. 5 has a rectangular parallelepiped spacer body, and is provided with convex portions on two opposing surfaces (total of four surfaces) of the rectangular parallelepiped. In the case where the spacer body is a rectangular parallelepiped, convex portions may be provided on all of its six surfaces. Or when providing a convex part (case side convex part) in the stopper side, it is also suitable to provide the spacer side recessed part from which depth differs in each of 6 surfaces of a rectangular parallelepiped spacer main body.

  There is no restriction | limiting in particular in the baseplate 10 in an Example. The case of the power conversion device may be a component corresponding to the base plate of the embodiment. The leaf spring of the embodiment corresponds to an example of an elastic member. As the elastic member, a coil spring or a resin having an appropriate elastic modulus may be used instead of the leaf spring.

  Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology illustrated in the present specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

2: Laminated cooling unit 3: Cooler 4: Semiconductor module 5: Connection pipe 9: Pressure distribution plate 10: Base plate 12, 13, 213, 313, 513: Stopper portion 13a, 313a, 513a, 513b: Recess (case side recess) )
21: Leaf spring (elastic member)
22, 222, 322, 422, 522: spacers 23a, 23b, 323a to 323d, 423a, 423b, 523a, 523b: convex portions (spacer side convex portions)
216: convex portion (case side convex portion)
227a, 227b: recess (spacer side recess)
424, 524: connecting portions 522a, 522b: spacer body

Claims (4)

A stacked cooling unit in which flat-plate semiconductor modules containing semiconductor elements and flat-plate coolers are alternately stacked;
A base plate on which a pair of stopper portions are erected and a laminated cooling unit is attached between the pair of stopper portions;
An elastic member that is inserted between one stopper portion and the end face of the multilayer cooling unit, and biases the multilayer cooling unit toward the other stopper portion;
A spacer inserted between one stopper portion and the elastic member;
With
A spacer-side convex portion having a different protruding length is provided on each of the stopper contact surface and the elastic member contact surface of the spacer, and a concave portion that fits the spacer-side convex portion on the spacer contact surface of the stopper portion. The depth is less than the spacer-side convex portion maximum length and a case-side concave portion having a minimum length or more is provided, or
A plurality of spacer-side recesses having different depths are provided on the stopper contact surface and the elastic member contact surface of the spacer, respectively, and a protrusion that fits the spacer-side recess on the spacer contact surface of the stopper portion. The protrusion length is not more than the spacer-side recess maximum depth, and the case-side protrusion not less than the minimum depth is provided,
The power converter characterized by the above-mentioned. A spacer-side convex portion having a different protruding length is provided on each of the stopper contact surface and the elastic member contact surface of the spacer, and a concave portion that fits the spacer-side convex portion on the spacer contact surface of the stopper portion. The depth is less than the maximum length of the spacer-side convex part, and a case-side concave part with a minimum length or more is provided,
The power converter according to claim 1, wherein a plurality of concave portions having different depths in which one spacer side convex portion can be selectively fitted is provided on the spacer contact surface of the stopper portion. The elastic member is a leaf spring,
The stopper part is provided with case-side recesses of the same shape at positions corresponding to both ends of the leaf spring,
The spacer has two spacer bodies that fit into the two case-side recesses, and a connecting portion that connects the two spacer bodies so that the spacer-side protrusions having the same protruding length are in the same direction. The power conversion device according to claim 1, wherein the power conversion device is a power conversion device. The elastic member is a leaf spring,
The stopper part is provided with a case-side convex part of the same shape at a position corresponding to each of both ends of the leaf spring,
The spacer has two spacer bodies that fit into the two case-side convex portions, and a connecting portion that connects the two spacer bodies so that the spacer-side concave portions of the same depth are in the same direction. The power converter according to claim 1 or 2, wherein

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