JP2019195235A - Power conversion device - Google Patents

Abstract

To provide a power conversion device in which occurrence of excessive stress on a bus bar is suppressed and which can be downsized.SOLUTION: A power conversion device 1 includes a plurality of electronic components 10, a first case 21, a second case 22, a bus bar 30, and a fixing member 40. The plurality of electronic components 10 constitute a power conversion circuit and include a capacitor 11. The capacitor 11 is fixed to the first case 21. The second case 22 is attached to the first case 21 so as to cover the capacitor 11, and at least one of the plurality of electronic components 10 excluding the capacitor 11 is fixed to the second case 22. The bus bar 30 electrically connects the capacitor 11 to the electronic component 10 fixed to the second case 22. The fixing member 40 fixes the capacitor 11 to the second case 22.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power conversion device.

  An electric vehicle or the like is provided with a power conversion device having functions of an inverter and a converter. For example, Patent Literature 1 discloses a power conversion device in which electronic components constituting a power conversion circuit are housed in a case. In the power converter, the capacitor is fixed to a member provided inside the case and is electrically connected to another electronic component fixed to the case via a bus bar.

JP 2011-239679 A

  In the configuration disclosed in Patent Document 1, since the capacitor is relatively large and heavy, the vibration is more likely to occur than other electronic components when the vibration of the vehicle or the like increases. And if a capacitor | condenser shakes more largely than another electronic component, an excessive stress will generate | occur | produce in the bus bar connected to the capacitor, and there exists a possibility of impairing the connection state of a bus bar. Therefore, in the configuration disclosed in Patent Document 1, a bend portion configured to be easily deformable by an external force by bending a part of the bus bar is provided in order to suppress an excessive stress from being generated in the bus bar. . However, since the bend portion needs a certain size in order to exhibit a sufficient stress suppressing effect, the power conversion device becomes relatively large and the mountability of the power conversion device is lowered.

  The present invention has been made in view of such a background, and an object of the present invention is to provide a power converter that can suppress the occurrence of excessive stress in a bus bar and can be downsized.

One aspect of the present invention is a plurality of electronic components (10) including a capacitor (11) constituting a power conversion circuit;
A first case (21) to which the capacitor is fixed;
A second case (22) attached to the first case so as to cover the capacitor and having at least one of the plurality of electronic components other than the capacitor fixed thereto;
A bus bar (30) for electrically connecting the capacitor and the electronic component fixed to the second case;
A fixing member (40) for fixing the capacitor to the second case;
It is in a power converter device (1) provided with.

  In the power conversion device, the capacitor fixed to the first case is electrically connected to the electronic component fixed to the second case via the bus bar. The capacitor is also fixed to the second case via a fixing member. Thereby, even if a vibration occurs in the power converter, it is possible to reduce the shake of the relatively heavy capacitor. As a result, since excessive stress is prevented from being generated in the bus bar that electrically connects the capacitor and the electronic component, it is not necessary to provide a bend portion in the bus bar, so that the apparatus can be downsized. .

  As described above, according to the present invention, it is possible to provide a power converter that can suppress the occurrence of excessive stress in the bus bar and can be miniaturized.

  In addition, the code | symbol in the parenthesis described in the means to solve a claim and a subject shows the correspondence with the specific means as described in embodiment mentioned later, and limits the technical scope of this invention. It is not a thing.

FIG. 3 is a conceptual cross-sectional view of the power conversion device according to the first embodiment. FIG. 3 is a perspective conceptual diagram of the power conversion device according to the first embodiment. FIG. 3 is a perspective view of a bus bar, a resin member, and a fixing member in the first embodiment. FIG. 3 is a top view of a bus bar, a resin member, and a fixing member in the first embodiment. The upper surface conceptual diagram of the power converter in the state where the 1st case was removed in Embodiment 1. The lower surface conceptual diagram of the power converter device of the state which removed the cover in Embodiment 1. FIG. The lower surface conceptual diagram of the power converter device in the state which attached the cover in Embodiment 1. FIG. The perspective view of a bus bar, the resin member, and a fixing member in the modification 1. The top view of a bus bar, the resin member, and a fixing member in the modification 1. The perspective view of a bus bar, the resin member, and a fixing member in the modification 2. The top view of a bus bar, the resin member, and a fixing member in the modification 2.

(Embodiment 1)
An embodiment of the power conversion device will be described with reference to FIGS.
The power conversion device 1 according to the present embodiment includes a plurality of electronic components 10, a first case 21, a second case 22, a bus bar 30, and a fixing member 40.
The plurality of electronic components 10 constitutes a power conversion circuit and includes a capacitor 11.
The capacitor 11 is fixed to the first case 21.
The second case 22 is attached to the first case 21 so as to cover the capacitor 11, and at least one of the plurality of electronic components 10 other than the capacitor 11 is fixed.
The bus bar 30 electrically connects the capacitor 11 and the electronic component 10 fixed to the second case 22.
The fixing member 40 fixes the capacitor 11 to the second case 22.

Hereinafter, the power converter device 1 of this embodiment is explained in full detail.
As shown in FIGS. 1 and 2, the power conversion device 1 includes a first case 21 and a second case 22. In the first case 21, the switching elements 13 and the like included in the plurality of electronic components 10 constituting the power conversion circuit are accommodated. The overlapping direction of the first case 21 and the second case 22 is the vertical direction Y, and the first case 21 is disposed above the second case 22 in Y1. A lid 23 that covers the inside of the first case 21 is attached to the surface of the first case 21 on the upper Y1 side. A capacitor 11 included in the plurality of electronic components 10 is attached to the surface of the first case 21 on the lower Y2 side with screws 14. The second case 22 is attached to the lower Y2 side surface of the first case 21 with screws 14 so as to cover the capacitor 11. The reactor 12 of the electronic components 10 is attached in the second case 22.

  As shown in FIG. 1, the capacitor 11 includes a capacitor fixing portion 113 to which a screw 14 is attached and a fixing boss 112 to which a fixing member 40 described later is attached. The capacitor fixing portion 113 is provided on the side surface of the base portion 11a that is one end in the vertical direction Y of the capacitor 11, and the fixing boss 112 is provided on the head portion 11b opposite to the base portion 11a in the vertical direction Y. In the present embodiment, the fixing boss 112 is provided on the top 11 c of the head 11 b that faces the bottom of the second case 22.

  As shown in FIG. 1, the capacitor 11 and the reactor 12 are electrically connected via a bus bar 30. As shown in FIG. 3, the bus bar 30 includes a first connection portion 31 and a second connection portion 32. As shown in FIG. 1, the first connection portion 31 is connected to the connection terminal 111 of the capacitor 11 to form a bus bar junction portion 61. The second connection part 32 is connected to the reactor 12. In the present embodiment, two second connection portions 32 are provided in the bus bar 30 so as to be connectable to the two reactors 12.

  As shown in FIGS. 3 and 4, a part of the bus bar 30 is molded in the resin member 50. The resin member 50 is formed with a bus bar fixing portion 51 for fixing the bus bar 30 to the second case. In the present embodiment, the bus bar fixing portion 51 is formed by inserting a collar 52 into the resin member 50. The collar 52 and the bus bar 30 are insulated from each other through the resin member 50. As shown in FIG. 1, the bus bar 30 is fixed to a bus bar fixing boss 221 provided on the inner bottom portion of the second case 22 by a bus bar fixing portion 51.

  As shown in FIG. 1, the fixing member 40 is configured to fix the head portion 11 b of the capacitor 11 to the second case 22. In the present embodiment, the fixing member 40 includes a first fixing portion 41 and a second fixing portion 42. The first fixing portion 41 is fastened and fixed to a fixing boss 112 provided on the top portion 11 c of the capacitor 11 to form a fixing member joint portion 62. The fixing member joint portion 62 is located closer to the center of gravity G of the capacitor 11 than the bus bar joint portion 61. On the other hand, the second fixing portion 42 is fastened and fixed to a capacitor fixing boss 222 provided in the second case 22.

  As shown in FIG. 1, the fixing member 40 fixes the capacitor 11 to the second case 22 by a bus bar joint portion 61 and a fixing member joint portion 62. The fixing member 40 is made of metal and has higher rigidity than the resin member 50 that molds the bus bar 30. As shown in FIG. 4, the fixing member 40 has an insert portion 43 that is inserted into the resin member 50 and connected to the resin member 50. The fixing member 40 is integrated with the resin member 50 via the insert portion 43.

  As shown in FIGS. 5 and 6, the second case 22 has an opening 223 at a position facing the bus bar joint 61 and the fixing member joint 62. As shown in FIG. 7, a removable cover 224 that covers the opening 223 is attached to the opening 223.

Next, the effect in the power converter device 1 of this embodiment is explained in full detail.
According to the power conversion device 1 of the present embodiment, the capacitor 11 is fixed to the first case 21 and is also fixed to the second case 22 via the fixing member 40. Occurrence is suppressed. As a result, since excessive stress is prevented from being generated in the bus bar 30 that electrically connects the capacitor 11 and the electronic component 19, it is not necessary to provide a bend portion in the bus bar 30. Can be planned.

  In the present embodiment, the fixing member 40 is configured to fix the head portion 11 b of the capacitor 11 to the second case 22. Thereby, the shaking of the capacitor | condenser 11 can be suppressed effectively and size reduction of an apparatus can be achieved further. Furthermore, in this embodiment, the fixing member 40 is configured to fix the top portion 11 c of the capacitor 11 to the second case 22 by providing the fixing boss 112 on the top portion 11 c of the capacitor 11. Thereby, the shaking of the capacitor | condenser 11 can be suppressed much more effectively and size reduction of an apparatus can be achieved further.

  Furthermore, in this embodiment, the fixing member 40 is made of metal. Therefore, the rigidity can be increased as compared with the case where a resin member is used as the fixing member 40, and the shaking of the capacitor 11 can be further suppressed.

  In the present embodiment, a part of the bus bar 30 is molded by the resin member 50, and the bus bar fixing portion for fixing the bus bar 30 to the second case 22 by being joined to the second case 22 on the resin member 50. 51 is provided. Thereby, the mounting workability of the bus bar 30 is improved.

  In the present embodiment, a part of the fixing member 40 is molded on the resin member 50. Accordingly, the fixing member 40 can be temporarily fixed to the second case 22 only by attaching the resin member 50 to the second case 22 via the bus bar fixing portion 51 at the time of assembly. Therefore, the mounting workability of the fixing member 40 is improved.

  In the present embodiment, the second case 22 has a bus bar joint 61 in which the capacitor 11 and the bus bar 30 are joined to each other, and a fixing member joint 62 in which the capacitor 11 and the fixing member 40 are joined to each other. And an opening 223 is formed at a position opposite to the cover 224, and a cover 224 covering the opening 223 is detachably attached. Thereby, in the state which assembled | attached the 1st case 21 and the 2nd case 22, the joining operation in the bus bar junction part 61 and the fixing member junction part 62 can be performed via the opening part 223, Assembling work The property is further improved. And the waterproofness in the 1st case 21 and the 2nd case 22 is maintainable by covering the opening part 223 with the cover 224. FIG.

  In the present embodiment, the fixing member joint portion 62 is positioned closer to the center of gravity G of the capacitor 11 than the bus bar joint portion 61. Thereby, the shaking of the capacitor | condenser 11 can be suppressed effectively and generation | occurrence | production of the stress in the bus bar 30 can be suppressed further.

  In this embodiment, the capacitor 11 and the second case 22 are fixed at one place via the fixing member 40. However, the capacitor 11 and the second case 22 are fixed at two or more places using the plurality of fixing members 40. It is good. Moreover, although the capacitor | condenser 11 and the fixing member 40 were joined by the fastening by a screw, not only this but a well-known joining method is employable. Moreover, in this embodiment, although the capacitor | condenser 11 was fixed to the lower surface of the 1st case 21, the fixed position in the 1st case 21 is not limited to this.

  In the first embodiment, the fixing member 40 has the insert portion 43 as shown in FIG. 4, but instead, the fixing member 40 is inserted into the insert portion 43 as in the first modification shown in FIGS. 8 and 9. May not be included. In this case, the same operational effects as those of the first embodiment are obtained except for the operational effects of the insert portion 43.

  In the first embodiment, the resin member 50 that covers a part of the bus bar 30 is provided as shown in FIG. 4. However, instead of this, the resin member 50 is used as in the second modification shown in FIGS. 10 and 11. The member 50 may not be provided. In this case, the same effects as those of the first embodiment are obtained except for the effects of the resin member 50.

  As described above, according to the present embodiment, it is possible to provide the power converter 1 that can suppress the occurrence of excessive stress in the bus bar 30 and can be downsized.

  The present invention is not limited to the above-described embodiments and modifications, and can be applied to various embodiments without departing from the scope of the invention.

DESCRIPTION OF SYMBOLS 1 Power converter 10 Electronic component 11 Capacitor 11b Head 21 First case 22 Second case 30 Bus bar 40 Fixing member 50 Resin member 51 Bus bar fixing part 61 Bus bar joint part 62 Fixing member joint part

Claims (7)

A plurality of electronic components (10) including a capacitor (11) constituting a power conversion circuit;
A first case (21) to which the capacitor is fixed;
A second case (22) attached to the first case so as to cover the capacitor and having at least one of the plurality of electronic components other than the capacitor fixed thereto;
A bus bar (30) for electrically connecting the capacitor and the electronic component fixed to the second case;
A fixing member (40) for fixing the capacitor to the second case;
A power converter (1) comprising:   The power converter according to claim 1, wherein the fixing member is configured to fix the head (11b) of the capacitor to the second case.   The power converter according to claim 1 or 2, wherein the fixing member is made of metal.   A part of the bus bar is molded with a resin member (50), and the resin member is provided with a bus bar fixing portion (51) for being joined to the second case and fixing the bus bar to the second case. The power converter device as described in any one of Claims 1-3.   The power converter according to claim 4, wherein a part of the fixing member is molded on the resin member.   The second case includes a bus bar joint portion (61) in which the capacitor and the bus bar are joined to each other, and a fixing member joint portion (62) in which the capacitor and the fixing member are joined to each other. The power converter according to any one of claims 1 to 5, wherein an opening (223) is formed at an opposing position, and a cover (224) covering the opening is detachably attached. .   The power converter according to claim 6, wherein the fixing member joint is located closer to the center of gravity (G) of the capacitor than the bus bar joint.

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