JP2013121219A - Power conversion apparatus and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power conversion apparatus by which manufacturing man-hours can be reduced and manufacturing time can be shortened, and to provide a manufacturing method therefor.SOLUTION: A power conversion apparatus is manufactured as follows. First, a composite elastic member 5 composed of two elastic members 51 and 52 is arranged on one side in a laminating direction (X direction) of a laminate 10. The composite elastic member 5 undergoes displacement through two elastic deformation states as a compressive force is applied thereto, which are: a first elastic deformation state S1 having a relatively low spring constant; and a second elastic deformation state S2 appearing after the first elastic deformation state S1 and having a spring constant greater than that of the first elastic deformation state S1. Then, the composite elastic member 5 is elastically deformed to compress the laminate 10 in the X direction by applying a high compressive force F that brings the composite elastic member 5 into the second elastic deformation state S2. Thereafter, the composite elastic member 5 is returned to the first elastic deformation state S1 or the initial state of the second elastic deformation state S2 by weakening the compressive force thereof, thereby fixing the laminate 10 in a frame 4.

Description

  The present invention relates to a power conversion device including a stacked body in which a plurality of semiconductor modules and a plurality of cooling pipes are stacked with heat dissipation grease interposed therebetween, and a manufacturing method thereof.

  Conventionally, for example, as a power conversion device that performs power conversion between DC power and AC power, a stacked body in which a plurality of semiconductor modules incorporating semiconductor elements and a plurality of cooling pipes that cool the semiconductor modules are stacked. What is provided is known (see Patent Document 1 below). The manufacturing method of the conventional power converter device is shown in FIGS.

  In order to manufacture the power conversion device, first, as shown in FIG. 15, a plurality of semiconductor modules 92 and a plurality of cooling pipes 93 are stacked to manufacture a stacked body 910 (a stacking process), and this stacked body 910 is assembled into a frame 94. (Storing process). On the surface of the semiconductor module 92, heat radiation grease 911 is applied in advance.

  Next, as shown in FIG. 16, a jig 917 is inserted into the gap D between the frame 94 and the laminated body 910, the opposite side of the frame 94 is supported by a fixing jig, and the laminated body 910 is compressed in the laminating direction (X direction). (High compression process). At this time, by applying a first compression force F to the laminate 910, the heat dissipation grease 911 is thinly extended. Thereby, the adhesiveness between the semiconductor module 92 and the cooling pipe 93 is improved, and the heat dissipation of the semiconductor module 92 is enhanced.

  Next, the jig 917 is taken out, and the compression load support plate 915 and the elastic member 99 (leaf spring) are put into the gap D as shown in FIG. Then, the second compression force f smaller than the first compression force F is applied to the elastic member 99, and the laminate 910 is compressed in the X direction while elastically deforming the elastic member 99 (low compression step).

  Next, as shown in FIG. 18, a fixture 97 is inserted between the elastic member 99 and the frame 94 to fix the elastic member 99 in an elastically deformed state. Accordingly, the laminated body 910 is fixed in the frame 94 while maintaining the contact pressure between the semiconductor module 92 and the cooling pipe 93 by using the elastic force of the elastic member 99.

JP 2007-166819 A

  In recent years, it has been required to reduce the number of manufacturing steps of the power conversion device and shorten the manufacturing time. However, in the conventional method for manufacturing a power converter, after the high compression step (see FIG. 16) is performed, the jig 917 is taken out and the elastic member 99 is not inserted instead. There is a problem that these two compression steps cannot be performed continuously because they cannot be performed. Therefore, it is necessary to perform the two compression steps separately, and there is a problem that it is difficult to shorten the manufacturing time.

  The present invention has been made in view of such a background, and an object of the present invention is to provide a power conversion device that can reduce the number of manufacturing steps and shorten the manufacturing time, and a manufacturing method thereof.

One aspect of the present invention is a method of manufacturing a power converter,
A stacking step of manufacturing a stack by stacking a plurality of semiconductor modules containing semiconductor elements, and a plurality of cooling pipes for cooling the semiconductor modules, with heat dissipation grease interposed therebetween,
A laminated body arranging step of arranging the laminated body inside the frame;
Combining two elastic members, and applying a compressive force, a first elastic deformation state having a relatively low spring constant, and the spring constant appearing after the first elastic deformation state is greater than the first elastic deformation state. An elastic member disposing step of disposing a composite elastic member that is displaced through two elastic deformation states with a higher second elastic deformation state on one side in the stacking direction of the stack with respect to the stack;
The composite elastic member is compressed in the stacking direction while elastically deforming the composite elastic member by applying a high compressive force that causes the composite elastic member to be in the second elastic deformation state, and then the compressive force is weakened and the composite elastic member is compressed. A continuous compression step of bringing the composite elastic member into the initial state of the second elastic deformation state or the first elastic deformation state;
And a fixing step of fixing the laminated body in the frame using a pressing force of the composite elastic member in the initial state of the second elastic deformation state or the first elastic deformation state. It exists in the manufacturing method of a converter (Claim 1).

Another aspect of the present invention is a laminate in which a plurality of semiconductor modules containing semiconductor elements and a plurality of cooling pipes for cooling the semiconductor modules are stacked with heat dissipation grease interposed therebetween,
A frame for holding the laminate inside,
A composite elastic member formed by combining two elastic members, disposed between the first wall portion located on one side in the stacking direction of the stacked body among the wall portions constituting the frame, and the stacked body. With
The composite elastic member has a first elastic deformation state with a relatively low spring constant as a compressive force is applied, and a second elastic constant that appears after the first elastic deformation state and has a higher spring constant than the first elastic deformation state. The laminated body is configured to be displaced through two elastic deformation states, ie, an elastic deformation state, by the pressing force of the composite elastic member in the initial state of the second elastic deformation state or the first elastic deformation state. The power converter is characterized by being pressed in the laminating direction and fixed in the frame.

In the method for manufacturing the power conversion device, the composite elastic member formed by combining two elastic members is disposed on one side in the stacking direction of the laminate (elastic member disposing step), and the continuous compression step is performed. Do.
If it does in this way, in the continuous compression process, in order to apply the above-mentioned high compressive force (force which makes a composite elastic member the above-mentioned 2nd elastic deformation state) to a layered product via a composite elastic member, between a cooling pipe and a semiconductor module The heat dissipation grease can be extended thinly. Then, after this, the compressive force applied to the composite elastic member is weakened to bring the composite elastic member into the initial state of the second elastic deformation state or the first elastic deformation state, thereby continuing the step of applying a force for fixing the laminate. Can be migrated. As a result, it is possible to continuously perform the process of extending the heat dissipation grease thinly and the process of applying a force for fixing the laminated body, thereby reducing the number of manufacturing steps of the power conversion device.
Moreover, after completing a continuous compression process, it can transfer to the said fixing process continuously. In this fixing step, the laminate can be fixed to the frame using the composite elastic member in the initial state of the second elastic deformation state or the first elastic deformation state.

  In the conventional method for manufacturing a power converter, a member (jig 917) for performing a high compression step (see FIG. 16) and a member (elastic member 99) for performing a low compression step (see FIG. 17) are provided. Since they were separate, after performing the high compression process, the low compression process cannot be performed unless the jig 917 is removed and the elastic member 99 is inserted instead, and these compression processes can be performed continuously. There was a problem that I could not. On the other hand, in the manufacturing method of the power converter, since the high compression step and the low compression step are performed using one member (composite elastic member), these compression steps can be performed continuously. . Therefore, the manufacturing man-hour of a power converter device can be reduced and a power converter device can be manufactured in a short time.

  Moreover, since the said power converter device is provided with the said composite elastic member, in assembling a power converter device, it becomes possible to perform the said continuous compression process in the manufacturing method of the said power converter device. Therefore, the manufacturing man-hour of a power converter device can be reduced and a power converter device can be manufactured in a short time.

  As described above, according to the present invention, it is possible to provide a power conversion device that can reduce the number of manufacturing steps and shorten the manufacturing time, and a manufacturing method thereof.

FIG. 3 is an explanatory diagram of a stacking process in the first embodiment. Explanatory drawing of the laminated body arrangement | positioning process in Example 1. FIG. Explanatory drawing of the elastic member arrangement | positioning process in Example 1. FIG. Explanatory drawing of the first half of the continuous compression process in Example 1. FIG. Explanatory drawing of the latter half of the continuous compression process in Example 1. FIG. Explanatory drawing of the fixing process in Example 1. FIG. 3 is a graph showing the relationship between the compressive force and deformation amount of a composite elastic member in Example 1. The top view of the power converter device in Example 1. FIG. AA sectional drawing of FIG. BB sectional drawing of FIG. The top view of the power converter device in Example 2. FIG. The perspective view of the composite elastic member in Example 3. FIG. The side view of the composite elastic member in Example 4. FIG. Sectional drawing of the composite elastic member in Example 5. FIG. The manufacturing process explanatory drawing of the power converter device in a prior art example. The figure following FIG. The figure following FIG. The figure following FIG.

The elastic member is a coil spring, and the composite elastic member is a combination of the two coil springs having different diameters and axial lengths, and is disposed inside the outer coil spring having a larger diameter than the outer coil spring. It is preferable that an inner coil spring having a small diameter is disposed (claims 2 and 5).
In this case, the state in which only one of the two coil springs is elastically deformed is the first elastic deformation state, and the state in which both coil springs are elastically deformed is the second elastic deformation state. Moreover, since the said composite elastic member has arrange | positioned the said inner coil spring inside the outer side coil spring, the external shape of a composite elastic member becomes the external shape of an outer side coil spring, and a composite elastic member can be reduced in size.

Preferably, the elastic member is a coil spring, and the composite elastic member is formed by connecting two coil springs having different spring constants in series (Claim 3 and Claim 6).
In this case, as the compressive force is applied, the coil spring having a small spring constant is mainly elastically deformed, and the composite elastic member is in the first elastic deformation state. After the coil spring having the small spring constant is completely deformed, the coil spring having the large spring constant is elastically deformed, and the composite elastic member is in the second elastic deformation state.
Since the composite elastic member connects and integrates two elastic members (coil springs), the number of parts can be reduced. Moreover, when manufacturing a power converter device, it becomes unnecessary to attach two elastic members separately, and a manufacturing process can be performed now easily. Thereby, it becomes possible to reduce the manufacturing cost of a power converter device.

Example 1
The Example which concerns on the said power converter device and its manufacturing method is described using FIGS.
The power converter 1 of this example is provided with the laminated body 10, the flame | frame 4, and the composite elastic member 5, as shown in FIGS. The laminated body 10 is formed by laminating a plurality of semiconductor modules 2 containing semiconductor elements and a plurality of cooling pipes 3 for cooling the semiconductor module 2 with heat radiation grease 11 interposed therebetween. A laminated body 10 is held inside the frame 4. The composite elastic member 5 is disposed between the laminated body 10 and the first wall part 41 located on one side in the lamination direction (X direction) of the laminated body 10 among the wall parts constituting the frame 4. The composite elastic member 5 is formed by combining two elastic members 51 and 52.

  As the compressive force is applied to the composite elastic member 5, the first elastic deformation state S1 (see FIG. 7) having a relatively low spring constant and the spring constant appearing after the first elastic deformation state S1 have the first elastic deformation state S1. It is configured to be displaced through two elastic deformation states with a higher second elastic deformation state S2. The laminated body 10 is pressed in the X direction and fixed in the frame 4 by the pressing force f of the composite elastic member 5 in the first elastic deformation state S1.

Moreover, in the manufacturing method of the power converter device 1 in this example, as shown in FIGS. 1-6, a lamination process (refer FIG. 1), a laminated body arrangement | positioning process (refer FIG. 2), and an elastic member arrangement | positioning process (FIG. 3). Reference), a continuous compression step (see FIGS. 4 and 5), and a fixing step (see FIG. 6).
As shown in FIG. 1, in the laminating process, a plurality of semiconductor modules 2 incorporating semiconductor elements and a plurality of cooling pipes 3 for cooling the semiconductor module 2 are laminated with a heat dissipating grease 11 interposed therebetween. Thus, the laminate 10 is manufactured.
As shown in FIG. 2, in the laminated body arranging step, the laminated body 10 is arranged inside the frame 4.

  As shown in FIG. 3, in the elastic member arranging step, the composite elastic member 5 is arranged on one side in the stacking direction (X direction) of the stacked body 10 with respect to the stacked body 10. The composite elastic member 5 is formed by combining two elastic members 51 and 52. As shown in FIG. 7, the composite elastic member 5 has a first elastic deformation state S1 having a relatively low spring constant and a spring constant appearing after the first elastic deformation state S1 as the compression force is applied. It displaces through two elastic deformation states, the second elastic deformation state S2 higher than the state S1.

In the continuous compression step, as shown in FIG. 4, the composite elastic member 5 is compressed in the X direction while elastically deforming the composite elastic member 5 by applying a high compression force F that causes the composite elastic member 5 to be in the second elastic deformation state S2. To do. Thereafter, as shown in FIG. 5, the compressive force is weakened to bring the composite elastic member 5 into the first elastic deformation state S1. In addition, when the rigidity of the frame 4 and the laminated body 10 is sufficiently high, the initial state of the second elastic deformation state S2 may be set.
In the fixing step, as shown in FIG. 6, the laminated body 10 is fixed in the frame 4 by using the pressing force f of the composite elastic member 5 in the first elastic deformation state S1.

  Next, a method for manufacturing the power conversion device 1 according to this example will be described in detail. As shown in FIG. 1, the semiconductor module 2 has a main body 200 that contains a semiconductor element. A control terminal 21 and a power terminal 22 (see FIG. 10) protrude from the main body 200. When manufacturing the laminated body 10, the thermal radiation grease 11 is previously apply | coated to the surface of the main-body part 200. FIG.

  The plurality of cooling pipes 3 are connected by connecting pipes 12 at both ends in the longitudinal direction (Y direction) of the cooling pipe 3. Among the plurality of cooling pipes 3, the cooling pipe 3 a located at one end in the X direction includes an introduction pipe 13 for introducing the refrigerant 30 (see FIG. 8) and a lead-out pipe 14 for leading the refrigerant 30. It is attached.

  After the lamination process is completed, as shown in FIG. 2, the laminated body 10 is arranged inside the frame 4 (a laminated body arranging process). The frame 4 of this example is made of metal, and the shape of the control terminal 21 viewed from the protruding direction (Z direction) is substantially rectangular.

  In the elastic member arranging step, as shown in FIG. 3, the composite elastic member 5 is inserted between the laminated body 10 and the first wall portion 41 located on one side in the X direction among the wall portions constituting the frame 4. To do. Further, a compression load support plate 15 is interposed between the composite elastic member 5 and the laminate 10. Further, the fixing plate 16 and the jig 17 are inserted between the first wall portion 41 and the composite elastic member 5. The purpose of the compression load support plate 15 is to uniformly press the cooling pipe 3b adjacent to the composite elastic member 5 when a compression force is applied to the composite elastic member 5 using the fixed plate 16 and the jig 17. It is said.

  The composite elastic member 5 includes an outer coil spring 52 and an inner coil spring 51 having a smaller diameter than the outer coil spring 52. The inner coil spring 51 is disposed inside the outer coil spring 52. Further, the length of the inner coil spring 51 in the X direction (axial direction) is longer than the length of the outer coil spring 52 in the X direction.

When a compression force is applied to the composite elastic member 5 using the jig 17 and the fixed plate 16, only the inner coil spring 51 is elastically deformed first, and the composite elastic member 5 is in the first elastic deformation state S1 (see FIG. 7). Become.
When compressive force is further applied to the composite elastic member 5, as shown in FIG. 4, both the inner coil spring 51 and the outer coil spring 52 are elastically deformed by the jig 17 and the fixing plate 16, and the composite elastic member 5 is 2 It becomes elastic deformation state S2 (refer FIG. 7).

  Thus, by applying a high compressive force F to the composite elastic member 5, the laminated body 10 is placed on the second wall portion 42 (see FIG. 2) located on the other end side in the X direction among the wall portions constituting the frame 4. Is pressed to compress the laminate 10. Thereby, the adhesiveness between the semiconductor module 92 and the cooling pipe 93 is improved, and the heat dissipation of the semiconductor module 92 is enhanced.

Next, as shown in FIG. 5, the compressive force applied to the composite elastic member 5 is weakened, and only the inner coil spring 51 is compressed, so that the composite elastic member 5 is in the first elastic deformation state S1. Alternatively, when the rigidity of the case 4 and the laminate 10 is sufficiently high, the initial state of the second elastic deformation state S2 may be set.
Thereafter, as shown in FIG. 6, the fixture 18 is inserted between the first wall portion 41 and the fixing plate 16. Accordingly, the laminated body 10 is fixed in the frame 4 while maintaining the contact pressure between the semiconductor module 2 and the cooling pipe 3 by using the pressing force f of the composite elastic member 5 in the first elastic deformation state S1. .

  In addition, in this example, after performing a laminated body arrangement | positioning process (refer FIG. 2), although the continuous compression process (refer FIG. 4, FIG. 5) is performed, these may be performed simultaneously. In other words, before being placed in the frame 4, the laminated body 10 is compressed in advance using the composite elastic member 5 outside the frame 4. At this time, a high compressive force F is applied to the composite elastic member 5 to be in the second elastic deformation state S2. And the laminated body 10 is put in the flame | frame 4 in the state which applied the high compressive force F, Then, compressive force is weakened and the composite elastic member 5 is made into the initial state of 1st elastic deformation state S1 or 2nd elastic deformation state S2. To do.

  On the other hand, as shown in FIGS. 8 to 10, the power conversion device 1 of this example includes a capacitor 19, bus bars 61 to 63, and a terminal block 69 in addition to the semiconductor module 2 and the frame 4. These components are housed in the housing case 6.

  As shown in FIG. 10, the semiconductor module 2 includes a plurality of power terminals 22 and a control terminal 21. The power terminal 22 includes a positive terminal 22a connected to a positive electrode of a DC power supply (not shown), a negative terminal 22b connected to a negative electrode of the DC power supply, and an AC terminal 22c connected to an AC load. . A positive electrode bus bar 61 is welded to the positive electrode terminal 22a, and a negative electrode bus bar 62 is welded to the negative electrode terminal 22b. An AC bus bar 63 is welded to the AC terminal 22c. The positive electrode bus bar 61 and the negative electrode bus bar 62 are connected to the capacitor 19.

  A control circuit board 64 is connected to the control terminal 21. By controlling the switching operation of the semiconductor module 2 by the control circuit board 64, the DC voltage applied between the positive terminal 22a and the negative terminal 22b is converted into an AC voltage and output from the AC terminal 22c. .

The effect of this example will be described. In the manufacturing method of the power converter 1 in this example, the composite elastic member 5 formed by combining two elastic members is disposed on one side in the X direction (elastic member disposing step), and the above-described continuous compression step is performed.
In this case, as shown in FIG. 4, in the continuous compression process, a high compressive force F (force that causes the composite elastic member 5 to be in the second elastic deformation state S <b> 2) is applied to the laminate 10 through the composite elastic member 5. The heat dissipating grease 11 between the cooling pipe 3 and the semiconductor module 2 can be thinly extended. After that, as shown in FIG. 5, the compressive force applied to the composite elastic member 5 is weakened and the composite elastic member 5 is brought into the first elastic deformation state S1, thereby continuing the process of applying a force for fixing the laminate 10. Can be migrated to. Thereby, the process of extending the heat dissipation grease 11 thinly and the process of applying a force for fixing the laminated body 10 can be continuously performed, and the number of manufacturing steps of the power conversion device 1 can be reduced.
Moreover, after completing a continuous compression process, as shown in FIG. 6, it can transfer to a fixing process continuously. In this fixing step, the laminate 10 can be fixed to the frame 4 using the composite elastic member 5 that has been in the first elastic deformation state S1.

  In the conventional method for manufacturing the power converter 1, a member (jig 917) for performing a high compression step (see FIG. 16), a member (elastic member 99) for performing a low compression step (see FIG. 17), and After the high compression process is performed, the low compression process cannot be performed unless the jig 917 is removed and the elastic member 99 is inserted instead, and these compression processes are performed continuously. There was a problem that could not. On the other hand, in the manufacturing method of the power converter 1 of this example, since the high compression process and the low compression process are performed using one member (composite elastic member 5), these compression processes are performed continuously. It becomes possible. Therefore, the manufacturing man-hour of the power converter device 1 can be reduced, and the power converter device 1 can be manufactured in a short time.

  In addition, if the high compression force F is applied to the laminated body 10 through one elastic member with a high spring constant and the compression force is not weakened as it is, the laminated body 10 is framed using the high elastic force of the elastic member. If it is fixed within 4, it is possible to reduce the number of times the compression process is performed, but in this case, the frame 4 needs to be more rigid and the frame is likely to be enlarged.

  Further, if a high compressive force F is applied to the laminate 10 through one elastic member having a low spring constant, then the compressive force is weakened, and the laminate 10 is put into the frame 4 using the elastic force of the elastic member. If it is fixed, two compression steps can be performed continuously. In this case, a high stress is applied to the elastic member when the high compression force F is applied, and the elastic member is easily damaged. Occurs.

  On the other hand, in this example, since the composite elastic member 5 is used, such a problem can be prevented. That is, as shown in FIG. 4, when a high compressive force F is applied, both the elastic member having a high spring constant (outer coil spring 52) and the elastic member having a low spring constant (inner coil spring 51) are elastically deformed. Therefore, high stress can be prevented from being applied to the elastic member (inner coil spring 51) having a low spring constant. Further, after applying the high compressive force F, as shown in FIG. 5, the compressive force is weakened to hold the laminate 10, and thereafter, the high compressive force F is not applied to the frame 4. Therefore, the frame 4 is not required to have high rigidity, and the frame 4 can be downsized.

3-5, the composite elastic member 5 of this example is formed by combining two coil springs 51 and 52 having different diameters and axial lengths. An inner coil spring 51 having a smaller diameter than the outer coil spring 52 is disposed inside the outer coil spring 52 having a large diameter.
In this case, since the inner coil spring 51 is disposed inside the outer coil spring 52, the outer shape of the composite elastic member 5 becomes the outer coil spring, and the composite elastic member 5 can be downsized.

  In this example, the spring constant of the inner coil spring 51 is smaller than the spring constant of the outer coil spring 52, but these spring constants may be equal to each other. In this example, the inner coil spring 51 is longer in the axial direction (X direction) than the outer coil spring 52, but the outer coil spring 52 may be longer.

  As described above, according to this example, it is possible to provide the power conversion apparatus 1 that can reduce the number of manufacturing steps and shorten the manufacturing time, and the manufacturing method thereof.

(Example 2)
In this example, as shown in FIG. 11, the laminated body 10 is housed in the housing case 6, and the laminated body 10 is fixed in the housing case 6 using the composite elastic member 5. The composite elastic member 5 is in the initial state of the second elastic deformation state S2 or in the first elastic deformation state S1, as in the first embodiment. In this example, the housing case 6 also serves as the frame 4.

When manufacturing the power converter device 1 of this example, similarly to Example 1, a lamination process, a laminated body arrangement process, an elastic member arrangement process, a continuous compression process, and a fixing process are performed.
In addition, the configuration and operational effects are the same as those of the first embodiment.

(Example 3)
This example is an example in which the shape of the composite elastic member 5 is changed. As shown in FIG. 12, the composite elastic member 5 of this example is formed by combining a coil spring 53 and a disc spring 54 having a spring constant higher than that of the coil spring 53. In the axial direction (X direction) of the coil spring 53, the length of the coil spring 53 is longer than the length of the disc spring 54. The disc spring 54 includes a main body portion 541, a plurality of leg portions 542 protruding from the main body portion 541, and a through hole 540 formed in the main body portion 541. A coil spring 53 is inserted into the through hole 540. When a compression force is applied to the disc spring 54, the disc spring 54 is elastically deformed while the angle θ between the main body portion 541 and the leg portion 542 is widened.

When a compression force is applied to the composite elastic member 5 using the fixing plate 16 and the jig 17, the coil spring 53 is first elastically deformed, and then both the coil spring 53 and the disc spring 54 are elastically deformed. The state in which only the coil spring 53 is elastically deformed is the first elastic deformation state S1, and the state in which both the coil spring 53 and the disc spring 54 are elastically deformed is the second elastic deformation state S2.
In addition, the same configuration as that of the first embodiment is provided.

The effect of this example will be described. In this example, since the disc spring 54 is used for the composite elastic member 5, the compression force can be firmly received by the plurality of legs 542 of the disc spring 54. Therefore, the composite elastic member 5 is less likely to wobble and is easy to stabilize.
In addition, the configuration and operational effects similar to those of the first embodiment are provided.

Example 4
This example is an example in which the shape of the composite elastic member 5 is changed. As shown in FIG. 13, the composite elastic member 5 of this example is configured by connecting two coil springs 55 and 56 having different spring constants in series. When a compression force is applied, the coil spring 55 having a small spring constant is mainly elastically deformed, and the composite elastic member 5 is in the first elastic deformation state S1. After the coil spring 55 having a small spring constant is completely deformed, the coil spring having a large spring constant is elastically deformed, and the composite elastic member 5 is in the second elastic deformation state S2.
In addition, the same configuration as that of the first embodiment is provided.

The effect of this example will be described. In this example, since two elastic members (coil springs 55 and 56) are connected to form one composite elastic member 5, the number of parts can be reduced. Moreover, when manufacturing the power converter device 1, it becomes unnecessary to attach the two coil springs 55 and 56 separately, and the manufacturing process can be easily performed. Thereby, the manufacturing cost of the power converter device 1 can be reduced.
In addition, the same effects as those of the first embodiment are obtained.

(Example 5)
This example is an example in which the shape of the composite elastic member 5 is changed. As shown in FIG. 14, the composite elastic member 5 of this example is formed by combining a coil spring 57 and a cylindrical elastic member 58 having a higher spring constant than the coil spring 57. The cylindrical elastic member 58 is made of an elastic material such as rubber. A coil spring 57 is arranged inside the cylindrical elastic member 58.
If it does in this way, since the coil spring 57 is arrange | positioned inside the cylindrical elastic member 58, the composite elastic member 5 is easy to reduce in size. Moreover, since the cylindrical elastic member 58 can be manufactured at a lower cost than the coil spring, the manufacturing cost of the composite elastic member 5 is reduced as compared with the case where the two coil springs 51 and 52 are combined as in the first embodiment. It's easy to do.
In addition, the configuration and operational effects are the same as those of the first embodiment.

DESCRIPTION OF SYMBOLS 1 Power converter 10 Laminated body 11 Thermal radiation grease 2 Semiconductor module 3 Cooling pipe 4 Frame 5 Composite elastic member 51,52 Elastic member

Claims (6)

A method for manufacturing a power converter,
A stacking step of manufacturing a stack by stacking a plurality of semiconductor modules containing semiconductor elements, and a plurality of cooling pipes for cooling the semiconductor modules, with heat dissipation grease interposed therebetween,
A laminated body arranging step of arranging the laminated body inside the frame;
Combining two elastic members, and applying a compressive force, a first elastic deformation state having a relatively low spring constant, and the spring constant appearing after the first elastic deformation state is greater than the first elastic deformation state. An elastic member disposing step of disposing a composite elastic member that is displaced through two elastic deformation states with a higher second elastic deformation state on one side in the stacking direction of the stack with respect to the stack;
The composite elastic member is compressed in the stacking direction while elastically deforming the composite elastic member by applying a high compressive force that causes the composite elastic member to be in the second elastic deformation state, and then the compressive force is weakened and the composite elastic member is compressed. A continuous compression step of bringing the composite elastic member into the initial state of the second elastic deformation state or the first elastic deformation state;
And a fixing step of fixing the laminated body in the frame using a pressing force of the composite elastic member in the initial state of the second elastic deformation state or the first elastic deformation state. A method for manufacturing a conversion device.   2. The method of manufacturing a power conversion device according to claim 1, wherein the elastic member is a coil spring, and the composite elastic member is a combination of two coil springs having different diameters and axial lengths. An inner coil spring having a diameter smaller than that of the outer coil spring is disposed inside the large outer coil spring.   2. The method of manufacturing a power conversion device according to claim 1, wherein the elastic member is a coil spring, and the composite elastic member is formed by connecting two coil springs having different spring constants in series. A method for manufacturing a power converter. A laminated body in which a plurality of semiconductor modules containing semiconductor elements and a plurality of cooling pipes for cooling the semiconductor modules are laminated with heat dissipation grease interposed therebetween;
A frame for holding the laminate inside,
A composite elastic member formed by combining two elastic members, disposed between the first wall portion located on one side in the stacking direction of the stacked body among the wall portions constituting the frame, and the stacked body. With
The composite elastic member has a first elastic deformation state with a relatively low spring constant as a compressive force is applied, and a second elastic constant that appears after the first elastic deformation state and has a higher spring constant than the first elastic deformation state. The laminated body is configured to be displaced through two elastic deformation states, ie, an elastic deformation state, by the pressing force of the composite elastic member in the initial state of the second elastic deformation state or the first elastic deformation state. Is pressed in the laminating direction and fixed in the frame.   5. The power conversion device according to claim 4, wherein the elastic member is a coil spring, and the composite elastic member is a combination of two coil springs having different diameters and axial lengths, and has a large diameter. An inner coil spring having a smaller diameter than the outer coil spring is disposed inside the spring.   5. The power converter according to claim 4, wherein the elastic member is a coil spring, and the composite elastic member is formed by connecting two coil springs having different spring constants in series. .

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