JP2019161019A - Electric conversion device - Google Patents

Abstract

To provide an electric conversion device capable of reducing a dimension of the entire electric conversion device in a direction parallel to a mounting surface of a high side arm element and a low side arm element.SOLUTION: An electric conversion device comprises: a coolant passage in which a coolant circulates; a heat radiation part having a first mounting surface and a second mounting surface parallel to the first mounting surface; and an element array in which a high side arm element and a low side arm element are arranged in a first direction parallel to the first and second mounting surfaces. A position of the high side arm element in the first direction and a position of the low side arm element are deviated, and the first mounting surface on which the high side arm element is mounted and the second mounting surface on which the low side arm element is mounted are arranged so as to be deviated in a second direction orthogonal to the first and second mounting surfaces.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power conversion device.

  2. Description of the Related Art Conventionally, there has been known a semiconductor device including a cooler that improves the shape of a connection portion or the like of an inlet / outlet of a coolant and reduces pressure loss at the connection portion (see, for example, Patent Document 1). ). The cooler of this semiconductor device is connected to an inlet and an outlet provided at diagonal positions on opposite side walls of the case, an inlet path connected to the inlet and formed in the case, and an outlet. A discharge path formed in the case and a cooling flow path between the introduction path and the discharge path are provided.

Japanese Patent Laying-Open No. 2015-0779819

  By the way, in the semiconductor device described above, how to arrange a plurality of semiconductor elements is not sufficiently devised. Therefore, in the semiconductor device described above, the entire semiconductor device is not sufficiently downsized.

  In view of the above-described problems, an object of the present invention is to provide a power conversion device that can reduce the size of the power conversion device in a direction parallel to the mounting surface of the high-side arm element and the low-side arm element. .

(1) A power conversion device according to an aspect of the present invention includes a refrigerant flow path through which a refrigerant flows, a first mounting surface, a heat dissipating unit having a second mounting surface parallel to the first mounting surface, A side arm element and a low side arm element are provided with an element row arranged in a first direction parallel to the first mounting surface and the second mounting surface, and the position of the high side arm element in the first direction The position of the low-side arm element is shifted, and the first mounting surface on which the high-side arm element is mounted and the second mounting surface on which the low-side arm element is mounted include the first mounting surface and the The second mounting surfaces are displaced from each other in a second direction orthogonal to the second mounting surface.

(2) The power conversion device according to (1) includes a positive electrode side conductor, an output side conductor, and a negative electrode side conductor, and a first electrode is provided on one surface of the high side arm element. Is disposed, the second electrode is disposed on the other surface of the high-side arm element, the first electrode is disposed on one surface of the low-side arm element, and is disposed on the other surface of the low-side arm element. The second electrode is disposed, and the high-side arm element and the low-side arm element are disposed at a position overlapping the output-side conductor when viewed in the second direction. One electrode is electrically connected to the positive electrode-side conductor, the second electrode of the high-side arm element is electrically connected to one surface of the output-side conductor, and the first electrode of the low-side arm element is The electrode is the output side conductive Of the other surface electrically connected to the second electrode of the low-side arm element may be electrically connected to the negative electrode side conductor.

(3) In the power conversion device according to (2), the high-side arm element and the positive-side conductor are arranged on one surface side of the output-side conductor, and the low-side arm element and the negative-electrode The side conductor may be disposed on the other surface side of the output side conductor.

(4) In the power conversion device according to (2) or (3), the heat dissipating unit is disposed on the opposite side of the high-side arm element across the positive electrode-side conductor in the second direction. An electrical insulation process is performed between the heat radiating portion and the positive electrode side conductor, and the heat radiating portion is arranged on the opposite side of the low side arm element across the output side conductor in the second direction. In addition, electrical insulation treatment may be performed between the heat radiating portion and the output-side conductor.

(5) The power conversion device according to any one of (2) to (4) includes another heat radiating portion, and in the second direction, the other heat radiating portion separates the negative electrode-side conductor. Arranged on the opposite side of the low-side arm element, an electrical insulation treatment is performed between the other heat radiating portion and the low-side arm element, and the other heat radiating portion is arranged on the output side in the second direction. It may be disposed on the opposite side of the high-side arm element with a conductor interposed therebetween, and an electrical insulation process may be performed between the other heat radiation portion and the output-side conductor.

  In the power converter described in (1) above, the high-side arm element and the low-side arm element are arranged to be shifted from each other in the second (height) direction. Therefore, the insulation distance between the high side arm element and the low side arm element can be ensured in the second direction. As a result, although the high-side arm element and the low-side arm element are displaced from each other in the first direction, the distance between the high-side arm element and the low-side arm element in the first direction can be reduced. Therefore, the dimension in the first direction of the power conversion device can be reduced as compared with the case where the high-side arm element and the low-side arm element are not shifted from each other in the second direction. That is, the size of the power conversion device in the first direction parallel to the mounting surface of the high-side arm element and the low-side arm element can be reduced.

  In the power converter described in (2) above, the high-side arm element is electrically connected to the output-side conductor, and the low-side arm element is also electrically connected to the output-side conductor. That is, the output-side conductor is shared by the high-side arm element and the low-side arm element. Therefore, compared with the case where the output side conductor for the high side arm element and the output side conductor for the low side arm element are provided separately, the number of parts and the number of assembly steps can be reduced, and the size of the power conversion device can be reduced. It can be downsized.

  In the power converter described in (3) above, the positive electrode side conductor is disposed on one side of the output side conductor, and the negative electrode side conductor is disposed on the other side of the output side conductor. . That is, the positive electrode side conductor and the negative electrode side conductor are arranged so as to be shifted from each other in the second direction. Therefore, the insulation distance between the positive electrode side conductor and the negative electrode side conductor can be ensured in the second direction. As a result, the interval between the positive electrode side conductor and the negative electrode side conductor in the first direction can be reduced. Therefore, the dimension in the first direction of the power conversion device can be reduced as compared with the case where the positive electrode-side conductor and the negative electrode-side conductor are not shifted from each other in the second direction.

In the power conversion device described in (4) above, the heat dissipating part is disposed on the opposite side of the high side arm element across the positive electrode side conductor in the second direction, and between the heat dissipating part and the positive electrode side conductor, Electrical insulation is applied. Therefore, the high-side arm element can be cooled by the heat radiating portion while ensuring electrical insulation between the heat radiating portion and the positive electrode-side conductor.
In the power converter described in (4) above, the heat dissipating part is disposed on the opposite side of the low-side arm element across the output-side conductor in the second direction, and between the heat dissipating part and the output-side conductor. Electrical insulation treatment is applied. Therefore, the low-side arm element can be cooled by the heat radiating portion while ensuring electrical insulation between the heat radiating portion and the output-side conductor.

The power conversion device according to (5) includes another heat radiating unit. Therefore, the cooling performance can be improved as compared with the case where no other heat radiating part is provided.
In the power converter described in (5) above, the other heat radiating part is disposed on the opposite side of the low side arm element across the negative electrode side conductor in the second direction, and the other heat radiating part and the low side arm element Between them, electrical insulation treatment is performed. Therefore, the low-side arm element can be cooled by the other heat radiating portion while ensuring electrical insulation between the other heat radiating portion and the negative electrode side conductor.
In the power converter described in (5) above, the other heat radiating portion is arranged on the opposite side of the high side arm element across the output side conductor in the second direction, and the other heat radiating portion and the output side conductor are arranged. Electrical insulation treatment is performed between the two. Therefore, the high side arm element can be cooled by the other heat radiating portion while ensuring the electrical insulation between the other heat radiating portion and the output-side conductor.

It is a figure which shows an example of the schematic vertical cross section of the power converter device of 1st Embodiment. It is the figure which extracted and showed only the thermal radiation part in FIG. FIG. 1 shows only the U-phase high-side arm element, U-phase low-side arm element, V-phase high-side arm element, V-phase low-side arm element, W-phase high-side arm element, and W-phase low-side arm element in FIG. It is. It is the figure which extracted and showed only the U-phase output side conductor in FIG. 1, the V-phase output side conductor, and the W-phase output side conductor. It is a schematic perspective view of an example of the power converter device of 1st Embodiment shown in FIG. It is a figure which shows the other example of the power converter device of 1st Embodiment. It is a 3rd page figure of the power converter device shown to FIG. 6 (A). It is a figure which shows the flow of the refrigerant | coolant in the thermal radiation part shown to FIG. 6 and FIG. It is a figure which shows an example of the power converter device of 3rd Embodiment. It is a 3rd page figure of the power converter device shown to FIG. 9 (A). It is a figure which shows the flow of the refrigerant | coolant in the thermal radiation part shown to FIG. 9 and FIG. It is a figure which shows an example of a part of vehicle which can apply the power converter device of 1st to 3rd embodiment.

  Hereinafter, embodiments of a power conversion device of the present invention will be described with reference to the accompanying drawings.

<First Embodiment>
FIG. 1 is a diagram illustrating an example of a schematic vertical section of the power conversion device 1 according to the first embodiment. FIG. 2 is a diagram showing only the heat dissipating part WJA in FIG. 3 shows the U-phase high-side arm element UH, U-phase low-side arm element UL, V-phase high-side arm element VH, V-phase low-side arm element VL, W-phase high-side arm element WH, and W-phase low-side arm element in FIG. It is the figure which extracted and showed only WL. 4 shows only the U-phase output side conductor (U-phase output bus bar) 51U, the V-phase output side conductor (V-phase output bus bar) 51V, and the W-phase output side conductor (W-phase output bus bar) 51W in FIG. It is the figure extracted and shown. FIG. 5 is a schematic perspective view of an example of the power conversion apparatus 1 according to the first embodiment shown in FIG.

  In the example shown in FIGS. 1 to 5, the power conversion device 1 includes a heat radiating portion WJA, a U-phase high-side arm element UH, a U-phase low-side arm element UL, a V-phase high-side arm element VH, and a V-phase low-side. Arm element VL, W phase high side arm element WH, W phase low side arm element WL, U phase positive electrode side conductor (U phase P bus bar) PIU, V phase positive electrode side conductor (V phase P bus bar) PIV W phase positive electrode side conductor (W phase P bus bar) PIW, U phase negative electrode side conductor (U phase N bus bar) NIU, V phase negative electrode side conductor (V phase N bus bar) NIV, W phase negative electrode Side conductor (W phase N bus bar) NIW, U phase output side conductor (U phase output bus bar) 51U, V phase output side conductor (V phase output bus bar) 51V, W phase output side conductor (W Phase output bus bar) 51W and U phase high side Signal line GUH, U-phase low-side gate signal line GUL, V-phase high-side gate signal line GVH, V-phase low-side gate signal line GVL, W-phase high-side gate signal line GWH, and W-phase low-side gate signal Line GWL, U-phase high-side spacer SPUH, U-phase low-side spacer SPUL, V-phase high-side spacer SPVH, V-phase low-side spacer SPVL, W-phase high-side spacer SPWH, W-phase low-side spacer SPWL, U Phase high side heat pipe HPH, U phase low side heat pipe HPUL, V phase high side heat pipe HPVH, V phase low side heat pipe HPVL, W phase high side heat pipe HPWH, and W phase low side heat pipe HPWL I have.

In the example shown in FIGS. 1 to 5, the heat radiating portion WJA includes a U-phase high-side arm element UH, a U-phase low-side arm element UL, a V-phase high-side arm element VH, a V-phase low-side arm element VL, and a W-phase high-side arm. The element WH and the W-phase low-side arm element WL are cooled. The heat radiating portion WJA includes refrigerant flow paths WJA1UH, WJA1UL, WJA1VH, WJA1VL, WJA1WH, and WJA1WL through which the refrigerant flows.
The refrigerant flowing through the refrigerant flow path WJA1UH mainly cools the U-phase high-side arm element UH. The refrigerant flowing through the refrigerant flow path WJA1UL mainly cools the U-phase low-side arm element UL. The refrigerant flowing through the refrigerant flow path WJA1VH mainly cools the V-phase high-side arm element VH. The refrigerant flowing through the refrigerant flow path WJA1VL mainly cools the V-phase low-side arm element VL. The refrigerant flowing through the refrigerant flow path WJA1WH mainly cools the W-phase high-side arm element WH. The refrigerant flowing through the refrigerant flow path WJA1WL mainly cools the W-phase low-side arm element WL.

As shown in FIG. 2, the heat radiating portion WJA includes a mounting surface WJA2UH, a mounting surface WJA2UL, a mounting surface WJA2VH, a mounting surface WJA2VL, a mounting surface WJA2WH, and a mounting surface WJA2WL. The mounting surfaces WJA2UH, WJA2UL, WJA2VH, WJA2VL, WJA2WH, and WJA2WL are parallel to each other.
As shown in FIGS. 1, 2, and 5, U-phase high-side arm element UH is mounted on mounting surface WJA2UH. A U-phase low-side arm element UL is mounted on the mounting surface WJA2UL. A V-phase high side arm element VH is mounted on the mounting surface WJA2VH. A V-phase low-side arm element VL is mounted on the mounting surface WJA2VL. A W-phase high side arm element WH is mounted on the mounting surface WJA2WH. A W-phase low-side arm element WL is mounted on the mounting surface WJA2WL.

In the example shown in FIGS. 1 to 5, the high side arm elements UH, VH, WH and the low side arm elements UL, VL, WL are, for example, IGBT (Insulated Gate Bipolar Transistor), MOSFET (Metal Oxide Semi-conductor Field Effect Transistor). And the like.
As shown in FIG. 3, the U-phase high side arm element UH includes one surface UHA and the other surface UHB. An electrode UHA1 is disposed on one surface UHA. An electrode UHB1 and a gate electrode UHB2 are disposed on the other surface UHB.
As shown in FIGS. 1, 3, and 5, the U-phase positive electrode-side conductor PIU is electrically connected to the electrode UHA1 of the U-phase high-side arm element UH. U-phase output-side conductor 51U is electrically connected to electrode UHB1 of U-phase high-side arm element UH via U-phase high-side spacer SPUH. U-phase high-side gate signal line GUH is electrically connected to gate electrode UHB2 of U-phase high-side arm element UH.
As shown in FIGS. 1, 4, and 5, the electrode UHB1 of the U-phase high-side arm element UH is disposed to face one surface 51UA of the U-phase output-side conductor 51U. That is, the U-phase high-side arm element UH is disposed at a position overlapping the U-phase output-side conductor 51U when viewed in the height direction. U-phase high-side arm element UH and U-phase positive electrode-side conductor PIU are arranged on one surface 51UA side of U-phase output-side conductor 51U.

As shown in FIG. 3, the U-phase low-side arm element UL includes one surface ULA and the other surface ULB. An electrode ULA1 is disposed on one surface ULA. An electrode ULB1 and a gate electrode ULB2 are arranged on the other surface ULB.
As shown in FIGS. 1, 3, and 5, the U-phase output-side conductor 51U is electrically connected to the electrode ULA1 of the U-phase low-side arm element UL. The U-phase negative electrode side conductor NIU is electrically connected to the electrode ULB1 of the U-phase low-side arm element UL via the U-phase low-side spacer SPUL. U-phase low-side gate signal line GUL is electrically connected to gate electrode ULB2 of U-phase low-side arm element UL.
As shown in FIGS. 1, 4, and 5, the electrode ULA1 of the U-phase low-side arm element UL is disposed to face the other surface 51UB of the U-phase output-side conductor 51U. That is, the U-phase low-side arm element UL is disposed at a position overlapping the U-phase output-side conductor 51U when viewed in the height direction. The U-phase low-side arm element UL and the U-phase negative electrode side conductor NIU are arranged on the other surface 51UB side of the U-phase output side conductor 51U.

As shown in FIG. 3, the V-phase high-side arm element VH includes one surface (the lower surface in FIG. 3) and the other surface (the upper surface in FIG. 3). An electrode VHA1 is disposed on one surface of the V-phase high-side arm element VH. An electrode VHB1 and a gate electrode VHB2 are arranged on the other surface of the V-phase high-side arm element VH.
As shown in FIGS. 1, 3, and 5, the V-phase positive electrode side conductor PIV is electrically connected to the electrode VHA1 of the V-phase high-side arm element VH. V-phase output-side conductor 51V is electrically connected to electrode VHB1 of V-phase high-side arm element VH via V-phase high-side spacer SPVH. V-phase high-side gate signal line GVH is electrically connected to gate electrode VHB2 of V-phase high-side arm element VH.
As shown in FIGS. 1, 4, and 5, the electrode VHB1 of the V-phase high-side arm element VH is disposed to face one surface 51VA of the V-phase output-side conductor 51V. Further, the V-phase high-side arm element VH and the V-phase positive electrode side conductor PIV are arranged on one surface 51VA side of the V-phase output side conductor 51V.

As shown in FIG. 3, the V-phase low-side arm element VL includes one surface (the lower surface in FIG. 3) and the other surface (the upper surface in FIG. 3). An electrode VLA1 is disposed on one surface of the V-phase low-side arm element VL. An electrode VLB1 and a gate electrode VLB2 are disposed on the other surface of the V-phase low-side arm element VL.
As shown in FIGS. 1, 3 and 5, the V-phase output-side conductor 51V is electrically connected to the electrode VLA1 of the V-phase low-side arm element VL. The V-phase negative electrode side conductor NIV is electrically connected to the electrode VLB1 of the V-phase low-side arm element VL via the V-phase low-side spacer SPVL. V-phase low-side gate signal line GVL is electrically connected to gate electrode VLB2 of V-phase low-side arm element VL.
As shown in FIGS. 1, 4, and 5, the electrode VLA1 of the V-phase low-side arm element VL is disposed to face the other surface 51VB of the V-phase output-side conductor 51V. The V-phase low-side arm element VL and the V-phase negative electrode side conductor NIV are disposed on the other surface 51VB side of the V-phase output side conductor 51V.

As shown in FIG. 3, the W-phase high-side arm element WH includes one surface (the lower surface in FIG. 3) and the other surface (the upper surface in FIG. 3). An electrode WHA1 is disposed on one surface of the W-phase high-side arm element WH. An electrode WHB1 and a gate electrode WHB2 are arranged on the other surface of the W-phase high-side arm element WH.
As shown in FIGS. 1, 3, and 5, the W-phase positive electrode-side conductor PIW is electrically connected to the electrode WHA1 of the W-phase high-side arm element WH. The W-phase output-side conductor 51W is electrically connected to the electrode WHB1 of the W-phase high-side arm element WH via the W-phase high-side spacer SPWH. The W-phase high side gate signal line GWH is electrically connected to the gate electrode WHB2 of the W-phase high side arm element WH.
As shown in FIGS. 1, 4, and 5, the electrode WHB1 of the W-phase high-side arm element WH is disposed to face one surface 51WA of the W-phase output-side conductor 51W. The W-phase high-side arm element WH and the W-phase positive electrode side conductor PIW are arranged on the one surface 51WA side of the W-phase output side conductor 51W.

As shown in FIG. 3, the W-phase low-side arm element WL has one surface (the lower surface in FIG. 3) and the other surface (the upper surface in FIG. 3). An electrode WLA1 is disposed on one surface of the W-phase low-side arm element WL. An electrode WLB1 and a gate electrode WLB2 are disposed on the other surface of the W-phase low-side arm element WL.
As shown in FIGS. 1, 3, and 5, the W-phase output-side conductor 51W is electrically connected to the electrode WLA1 of the W-phase low-side arm element WL. The W-phase negative electrode side conductor NIW is electrically connected to the electrode WLB1 of the W-phase low-side arm element WL through the W-phase low-side spacer SPWL. W-phase low-side gate signal line GWL is electrically connected to gate electrode WLB2 of W-phase low-side arm element WL.
As shown in FIGS. 1, 4, and 5, the electrode WLA1 of the W-phase low-side arm element WL is disposed to face the other surface 51WB of the W-phase output-side conductor 51W. W-phase low-side arm element WL and W-phase negative electrode side conductor NIW are arranged on the other surface 51WB side of W-phase output side conductor 51W.

As shown in FIGS. 1, 2 and 5, the mounting surface WJA2UH of the heat radiating portion WJA is disposed on the opposite side of the U-phase high-side arm element UH across the U-phase positive electrode-side conductor PIU in the height direction. ing. In addition, electrical insulation processing such as anodizing is performed between the mounting surface WJA2UH of the heat radiating portion WJA and the U-phase positive electrode-side conductor PIU.
The mounting surface WJA2UL of the heat radiating portion WJA is disposed on the opposite side of the U-phase low-side arm element UL across the U-phase output-side conductor 51U in the height direction. In addition, electrical insulation processing such as anodizing is performed between the mounting surface WJA2UL of the heat radiating portion WJA and the U-phase output-side conductor 51U.
The mounting surface WJA2VH of the heat radiating portion WJA is disposed on the opposite side of the V-phase high-side arm element VH across the V-phase positive electrode-side conductor PIV in the height direction. In addition, electrical insulation processing such as anodizing is performed between the mounting surface WJA2VH of the heat radiating portion WJA and the V-phase positive electrode side conductor PIV.
The mounting surface WJA2VL of the heat radiating portion WJA is disposed on the opposite side of the V-phase low-side arm element VL across the V-phase output-side conductor 51V in the height direction. In addition, electrical insulation processing such as anodizing is performed between the mounting surface WJA2VL of the heat radiating portion WJA and the V-phase output-side conductor 51V.
The mounting surface WJA2WH of the heat radiating portion WJA is arranged on the opposite side of the W-phase high-side arm element WH across the W-phase positive electrode-side conductor PIW in the height direction. In addition, electrical insulation processing such as anodizing is performed between the mounting surface WJA2WH of the heat radiating portion WJA and the W-phase positive electrode side conductor PIW.
The mounting surface WJA2WL of the heat dissipating part WJA is disposed on the opposite side of the W-phase low-side arm element WL across the W-phase output-side conductor 51W in the height direction. In addition, electrical insulation processing such as anodizing is performed between the mounting surface WJA2WL of the heat radiating portion WJA and the W-phase output-side conductor 51W.

In the example shown in FIGS. 1 to 5, the U-phase high-side heat pipe HPUH is disposed on the opposite side of the U-phase high-side arm element UH across the U-phase output-side conductor 51U in the height direction. U-phase low-side heat pipe HPUL is arranged on the opposite side of U-phase low-side arm element UL across U-phase negative electrode-side conductor NIU in the height direction.
V-phase high-side heat pipe HPVH is arranged on the opposite side of V-phase high-side arm element VH across V-phase output-side conductor 51V in the height direction. V-phase low-side heat pipe HPVL is arranged on the opposite side of V-phase low-side arm element VL across V-phase negative electrode-side conductor NIV in the height direction.
W-phase high-side heat pipe HPWH is arranged on the opposite side of W-phase high-side arm element WH across W-phase output-side conductor 51W in the height direction. W-phase low-side heat pipe HPWL is arranged on the opposite side of W-phase low-side arm element WL across W-phase negative electrode-side conductor NIW in the height direction.

  As shown in FIG. 1, the U-phase high-side arm element UH and the U-phase low-side arm element UL are arranged in the first direction D1 (the left-right direction in FIG. 1) to form a U-phase element array. The V-phase high-side arm element VH and the V-phase low-side arm element VL are arranged in the first direction D1 to form a V-phase element array. W-phase high-side arm element WH and W-phase low-side arm element WL are arranged in the first direction D1 to form a W-phase element array.

As shown in FIGS. 1 and 2, the mounting surface WJA2UH of the heat radiating portion WJA on which the U-phase high-side arm element UH is mounted and the mounting surface WJA2UL of the heat-dissipating portion WJA on which the U-phase low-side arm element UL is mounted are The height direction DH (vertical direction in FIGS. 1 and 2) perpendicular to the first direction D1 is shifted from each other in the height direction DH perpendicular to the mounting surface WJA2UH and the mounting surface WJA2UL. Therefore, the insulation distance between U-phase high side arm element UH and U-phase low side arm element UL can be ensured in the height direction.
As shown in FIG. 1, the position of the U-phase high-side arm element UH and the position of the U-phase low-side arm element UL in the first direction D1 are shifted.
In the example shown in FIGS. 1 to 5, as described above, the U-phase high-side arm is shifted from the position of the U-phase high-side arm element UH and the position of the U-phase low-side arm element UL in the first direction D1. An insulation distance between element UH and U-phase low-side arm element UL is ensured in the height direction. Therefore, as shown in FIG. 1, the distance between the U-phase high-side arm element UH and the U-phase low-side arm element UL in the first direction D1 can be reduced.
Specifically, in the example shown in FIG. 1, the left end portion of the U-phase high-side arm element UH in the first direction D1 and the right end portion of the U-phase low-side arm element UL are matched.

As shown in FIG. 1 and FIG. 2, the mounting surface WJA2VH of the heat dissipation part WJA on which the V-phase high-side arm element VH is mounted and the mounting surface WJA2VL of the heat dissipation part WJA on which the V-phase low-side arm element VL is mounted are They are shifted from each other in the height direction DH.
As shown in FIG. 1, the position of the V-phase high-side arm element VH and the position of the V-phase low-side arm element VL in the first direction D1 are shifted.
Specifically, in the example shown in FIG. 1, the left end portion of the V-phase high-side arm element VH in the first direction D1 and the right end portion of the V-phase low-side arm element VL are matched. Further, the left end portion of the V-phase low-side arm element VL and the right end portion of the U-phase high-side arm element UH in the first direction D1 are matched.

As shown in FIGS. 1 and 2, the mounting surface WJA2WH of the heat radiating portion WJA on which the W-phase high side arm element WH is mounted and the mounting surface WJA2WL of the heat radiating portion WJA on which the W-phase low side arm element WL is mounted are They are shifted from each other in the height direction DH.
As shown in FIG. 1, the position of the W-phase high-side arm element WH and the position of the W-phase low-side arm element WL in the first direction D1 are shifted.
Specifically, in the example shown in FIG. 1, the left end portion of the W-phase high-side arm element WH and the right end portion of the W-phase low-side arm element WL in the first direction D1 are matched. Further, the left end portion of the W-phase low-side arm element WL and the right end portion of the V-phase high-side arm element VH in the first direction D1 are made to coincide with each other.
Therefore, in the example shown in FIGS. 1 to 5, the distance between the U-phase high-side arm element UH and the U-phase low-side arm element UL in the first direction D1, and the V-phase high-side arm element VH and V-phase in the first direction D1. The distance between the low-side arm element VL, the distance between the W-phase high-side arm element WH and the W-phase low-side arm element WL in the first direction D1, the U-phase high-side arm element UH and the V-phase low-side arm element VL in the first direction D1. And the size of the power conversion device 1 in the first direction D1 is smaller than the case where the distance between the V-phase high-side arm element VH and the W-phase low-side arm element WL in the first direction D1 is provided. be able to.

  1 to 5, the U-phase high-side arm element UH and the U-phase low-side arm element UL share the U-phase output-side conductor 51U, and the V-phase high-side arm element VH and the V-phase. The low-side arm element VL shares the V-phase output-side conductor 51V, and the W-phase high-side arm element WH and the W-phase low-side arm element WL share the W-phase output-side conductor 51W. Therefore, compared with the case where the output side conductor for the high side arm element and the output side conductor for the low side arm element are provided separately, the number of parts and the number of assembly steps can be reduced, and the entire power conversion device 1 can be reduced. The size of can be reduced.

  In the example shown in FIGS. 1 to 5, the U-phase positive electrode-side conductor PIU and the U-phase negative electrode-side conductor NIU are shifted from each other in the height direction DH, and the V-phase positive electrode-side conductor PIV and the V-phase The negative electrode side conductor NIV is displaced from each other in the height direction DH, and the W phase positive electrode side conductor PIW and the W phase negative electrode side conductor NIW are displaced from each other in the height direction DH. Therefore, while reducing the size of the power conversion device 1 in the first direction D1, the insulation distance between the U-phase positive electrode-side conductor PIU and the U-phase negative electrode-side conductor NIU, the V-phase positive electrode-side conductor PIV and the V-phase The insulation distance between the negative electrode side conductor NIV and the insulation distance between the W phase positive electrode side conductor PIW and the W phase negative electrode side conductor NIW can be secured in the height direction DH.

  Moreover, in the example shown in FIGS. 1-5, between the mounting surface WJA2UH of the heat radiating portion WJA and the U-phase positive electrode side conductor PIU, between the mounting surface WJA2UL of the heat radiating portion WJA and the U-phase output side conductor 51U, Between the mounting surface WJA2VH of the heat dissipating part WJA and the V phase positive electrode side conductor PIV, between the mounting surface WJA2VL of the heat dissipating part WJA and the V phase output side conductor 51V, the mounting surface WJA2WH of the heat dissipating part WJA and the W phase positive electrode side Electrical insulation is performed between the conductor PIW and between the mounting surface WJA2WL of the heat radiating portion WJA and the W-phase output-side conductor 51W. Therefore, the U-phase high-side arm element UH, the U-phase low-side arm element UL, the V-phase high-side arm element VH, the V-phase low-side arm element VL, the W-phase high-side arm element WH and the necessary electric insulation are secured. The W-phase low-side arm element WL can be cooled.

FIG. 6 is a diagram illustrating another example of the power conversion device 1 according to the first embodiment. Specifically, FIG. 6A is a perspective view of the power converter 1 after the heat radiating portion WJA is assembled. FIG. 6B is a perspective view of the power conversion device 1 before the heat radiating portion WJA is assembled.
FIG. 7 is a three-side view of the power conversion device 1 shown in FIG. Specifically, FIG. 7A is a left side view of the power conversion device 1 when the power conversion device 1 shown in FIG. 6A is viewed from the left front side of FIG. 6A. FIG. 7B is a front view of the power conversion device 1 when the power conversion device 1 shown in FIG. 6A is viewed from the right front side of FIG. 6A. FIG.7 (C) is the top view of the power converter device 1 which looked at the power converter device 1 shown to FIG. 6 (A) from the upper side of FIG. 6 (A).
FIG. 8 is a diagram showing the flow of the refrigerant in the heat radiating portion WJA shown in FIGS. 6 and 7.

In the example shown in FIGS. 1 to 5, the power conversion device 1 includes a U-phase high-side heat pipe HPUH, a U-phase low-side heat pipe HPUL, a V-phase high-side heat pipe HPVH, and a V-phase low-side heat pipe HPVL. A W-phase high-side heat pipe HPWH and a W-phase low-side heat pipe HPWL are provided.
On the other hand, in the example shown in FIGS. 6-8, the power converter device 1 is not provided with them.

In the example shown in FIGS. 6 to 8, the heat radiating portion WJA includes a refrigerant flow channel inlet portion WJA1IN and a refrigerant flow channel outlet portion WJA1OUT.
The refrigerant that has flowed into the heat radiating portion WJA from the refrigerant flow passage inlet WJA1IN flows through the refrigerant flow passages WJA1UH, WJA1UL, WJA1VH, WJA1VL, WJA1WH, WJA1WL, and flows out of the heat radiating portion WJA through the refrigerant flow passage outlet WJA1OUT. .

Second Embodiment
Hereinafter, 2nd Embodiment of the power converter device 1 of this invention is described.
The power converter 1 of 2nd Embodiment is comprised similarly to the power converter 1 of 1st Embodiment mentioned above except the point mentioned later. Therefore, according to the power converter device 1 of 2nd Embodiment, except the point mentioned later, there can exist an effect similar to the power converter device 1 of 1st Embodiment mentioned above.

The power conversion device 1 of the first embodiment shown in FIG. 1 to FIG. 8 has three-phase components that are U-phase components, V-phase components, and W-phase components. The power converter 1 of the form has only one phase component, such as a U-phase component.
That is, the power conversion device 1 according to the second embodiment includes, for example, refrigerant flow paths WJA1UH and WJA1UL (see FIG. 1) through which refrigerant flows, a mounting surface WJA2UH (see FIG. 2), and a mounting surface parallel to the mounting surface WJA2UH. A heat radiating portion WJA (see FIGS. 1 and 2) having WJA2UL (see FIG. 2), a high-side arm element UH (see FIG. 1), and a low-side arm element UL (see FIG. 1) are provided in the first direction D1. (See FIG. 1).
In the power conversion device 1 of the second embodiment, for example, the mounting surface WJA2UH on which the high-side arm element UH is mounted and the mounting surface WJA2UL on which the low-side arm element UL is mounted are perpendicular to the first direction D1. In the direction DH (vertical direction in FIG. 1), the mounting surface WJA2UH and the height direction DH perpendicular to the mounting surface WJA2UL are shifted from each other. The position of the high side arm element UH and the position of the low side arm element UL in the first direction D1 (left and right direction in FIG. 1) are shifted.

<Third Embodiment>
Hereinafter, 3rd Embodiment of the power converter device 1 of this invention is described, referring an accompanying drawing.
The power converter 1 of 3rd Embodiment is comprised similarly to the power converter 1 of 1st Embodiment mentioned above except the point mentioned later. Therefore, according to the power converter device 1 of 3rd Embodiment, except the point mentioned later, there can exist an effect similar to the power converter device 1 of 1st Embodiment mentioned above.

Although the power converter device 1 of 1st Embodiment shown in FIGS. 1-8 is equipped with the thermal radiation part WJA, the power converter device 1 of 2nd Embodiment is equipped with the thermal radiation part WJB other than the thermal radiation part WJA. ing.
FIG. 9 is a diagram illustrating an example of the power conversion device 1 according to the third embodiment. Specifically, FIG. 9A is a perspective view of the power conversion device 1 after the heat radiating portion WJA and the heat radiating portion WJB are assembled. FIG. 9B is a perspective view of the power conversion device 1 before the heat radiating portion WJA and the heat radiating portion WJB are assembled.
FIG. 10 is a three-side view of the power conversion device 1 shown in FIG. Specifically, FIG. 10 (A) is a left side view of the power conversion device 1 when the power conversion device 1 shown in FIG. 9 (A) is viewed from the left front side of FIG. 9 (A). FIG. 10B is a front view of the power conversion device 1 when the power conversion device 1 shown in FIG. 9A is viewed from the right front side of FIG. 9A. FIG. 10C is a plan view of the power conversion device 1 when the power conversion device 1 shown in FIG. 9A is viewed from the upper side of FIG. 9A.
FIG. 11 is a diagram showing a refrigerant flow in the heat radiating portion WJB shown in FIGS. 9 and 10.

In the example shown in FIGS. 9 to 11, the heat radiating portion WJB includes the U-phase high-side arm element UH, the U-phase low-side arm element UL, the V-phase high-side arm element VH, the V-phase low-side arm element VL, and the W-phase high-side arm. The element WH and the W-phase low-side arm element WL are cooled from the opposite side of the heat dissipation part WJA. The heat radiating portion WJB includes refrigerant flow paths WJB1UH, WJB1UL, WJB1VH, WJB1VL, WJB1WH, and WJB1WL through which the refrigerant flows.
Further, the heat radiating portion WJB includes a refrigerant flow path inlet WJB1IN and a refrigerant flow path outlet WJB1OUT.
The refrigerant that has flowed into the heat radiating part WJB from the refrigerant flow path inlet WJB1IN flows through the refrigerant flow paths WJB1UH, WJB1UL, WJB1VH, WJB1VL, WJB1WH, WJB1WL, and flows out of the heat radiating part WJB via the refrigerant flow path outlet WJB1OUT. .
The refrigerant flowing through the refrigerant flow path WJB1UH mainly cools the U-phase high-side arm element UH. The refrigerant flowing through the refrigerant flow path WJB1UL mainly cools the U-phase low-side arm element UL. The refrigerant flowing through the refrigerant flow path WJB1VH mainly cools the V-phase high-side arm element VH. The refrigerant flowing through the refrigerant flow path WJB1VL mainly cools the V-phase low-side arm element VL. The refrigerant flowing through the refrigerant flow path WJB1WH mainly cools the W-phase high-side arm element WH. The refrigerant flowing through the refrigerant flow path WJB1WL mainly cools the W-phase low-side arm element WL.

As shown in FIG. 10B, the heat radiating portion WJB is disposed on the opposite side of the U-phase low-side arm element UL across the U-phase negative electrode-side conductor NIU in the height direction. In addition, an electrical insulation process such as an alumite process is performed between the heat radiation part WJB and the U-phase negative electrode side conductor NIU.
The heat radiating portion WJB is disposed on the opposite side of the U-phase high-side arm element UH across the U-phase output-side conductor 51U in the height direction. In addition, an electrical insulation process such as an alumite process is performed between the heat radiation part WJB and the U-phase output-side conductor 51U.
The heat radiating portion WJB is arranged on the opposite side of the V-phase low-side arm element VL across the V-phase negative electrode side conductor NIV in the height direction. In addition, an electrical insulation process such as alumite treatment is performed between the heat radiation part WJB and the V-phase negative electrode side conductor NIV.
The heat radiating portion WJB is arranged on the opposite side of the V-phase high-side arm element VH across the V-phase output-side conductor 51V in the height direction. In addition, an electrical insulation process such as anodizing is performed between the heat radiating portion WJB and the V-phase output-side conductor 51V.
The heat radiating portion WJB is arranged on the opposite side of the W-phase low-side arm element WL across the W-phase negative electrode side conductor NIW in the height direction. In addition, an electrical insulation process such as an alumite process is performed between the heat radiation part WJB and the W-phase negative electrode side conductor NIW.
The heat radiating portion WJB is arranged on the opposite side of the W-phase high-side arm element WH across the W-phase output-side conductor 51W in the height direction. In addition, an electrical insulation process such as an alumite process is performed between the heat radiation part WJB and the W-phase output-side conductor 51W.

In the example shown in FIGS. 9 to 11, since the heat radiating portion WJB is provided, the cooling performance can be improved as compared with the case where the heat radiating portion WJB is not provided.
Further, in the example shown in FIGS. 9 to 11, between the heat radiating portion WJB and the U-phase negative electrode-side conductor NIU, between the heat radiating portion WJB and the U-phase output-side conductor 51U, and between the heat radiating portion WJB and the V-phase negative electrode side. Between the conductor NIV, between the heat dissipation part WJB and the V-phase output side conductor 51V, between the heat dissipation part WJB and the W-phase negative electrode side conductor NIW, and between the heat dissipation part WJB and the W-phase output side conductor 51W. Since the electrical insulation treatment is applied between the U-phase high-side arm element UH and the U-phase low-side arm while ensuring the necessary electrical insulation not only by the heat radiating portion WJA but also by the heat radiating portion WJB. The element UL, the V-phase high-side arm element VH, the V-phase low-side arm element VL, the W-phase high-side arm element WH, and the W-phase low-side arm element WL can be cooled.

<Application example>
Hereinafter, application examples of the power conversion device 1 of the present invention will be described with reference to the accompanying drawings.
FIG. 12 is a diagram illustrating an example of a part of the vehicle 10 to which the power conversion device 1 according to the first to third embodiments can be applied.

In the example shown in FIG. 12, the power conversion device 1 of the first embodiment and the power conversion device 1 of the second embodiment are applied to a vehicle 10.
Specifically, the power conversion device 1 shown in FIG. 12 includes two power conversion devices 1 of the first embodiment shown in FIGS. 1 to 5 and one power conversion device 1 of the second embodiment. Yes.
In the example shown in FIG. 12, the vehicle 10 includes a battery 11 (BATT), a first motor 12 (MOT) for driving and a second motor 13 (GEN) for power generation, in addition to the power conversion device 1. I have.
The battery 11 includes a battery case and a plurality of battery modules accommodated in the battery case. The battery module includes a plurality of battery cells connected in series. The battery 11 includes a positive terminal PB and a negative terminal NB that are connected to the DC connector 1a of the power converter 1. The positive terminal PB and the negative terminal NB are connected to positive and negative ends of a plurality of battery modules connected in series in the battery case.

  The first motor 12 generates a rotational driving force (power running operation) with the electric power supplied from the battery 11. The second motor 13 generates generated power by the rotational driving force input to the rotating shaft. Here, the second motor 13 is configured to be able to transmit the rotational power of the internal combustion engine. For example, each of the first motor 12 and the second motor 13 is a three-phase AC brushless DC motor. The three phases are the U phase, the V phase, and the W phase. Each of the first motor 12 and the second motor 13 is an inner rotor type. The first motor 12 and the second motor 13 are each provided with a rotor having a permanent magnet for field and a stator having a three-phase stator winding for generating a rotating magnetic field for rotating the rotor. Yes. The three-phase stator windings of the first motor 12 are connected to the first three-phase connector 1 b of the power conversion device 1. The three-phase stator winding of the second motor 13 is connected to the second three-phase connector 1 c of the power conversion device 1.

The power converter 1 shown in FIG. 12 includes a power module 21, a reactor 22, a capacitor unit 23, a resistor 24, a first current sensor 25, a second current sensor 26, a third current sensor 27, An electronic control unit 28 (MOT GEN ECU) and a gate drive unit 29 (G / D VCU ECU) are provided.
The power module 21 includes a first power conversion circuit unit 31, a second power conversion circuit unit 32, and a third power conversion circuit unit 33.

In the example illustrated in FIG. 12, the first power conversion circuit unit 31 includes the first power conversion device 1 according to the first embodiment illustrated in FIGS. 1 to 5. The output side conductors 51U, 51V, 51W of the power conversion device 1 of the first embodiment shown in the first FIG. 1 to FIG. 5 are combined and connected to the first three-phase connector 1b. That is, the output side conductors 51U, 51V, 51W of the first power conversion device 1 of the first embodiment shown in FIGS. 1 to 5 constituting the first power conversion circuit unit 31 are the first three-phase connectors. It is connected to the three-phase stator winding of the first motor 12 via 1b.
The positive-side conductors PIU, PIV, and PIW of the first power conversion device 1 according to the first embodiment shown in FIGS. 1 to 5 that constitute the first power conversion circuit unit 31 are combined into the positive electrode of the battery 11. It is connected to the terminal PB.
The negative-side conductors NIU, NIV, NIW of the first power conversion device 1 of the first embodiment shown in FIGS. 1 to 5 constituting the first power conversion circuit unit 31 are combined into the negative electrode of the battery 11. It is connected to the terminal NB.
That is, the first power conversion circuit unit 31 converts DC power input from the battery 11 via the third power conversion circuit unit 33 into three-phase AC power.

In the example illustrated in FIG. 12, the second power conversion circuit unit 32 includes the second power conversion device 1 according to the first embodiment illustrated in FIGS. 1 to 5. The output side conductors 51U, 51V, 51W of the power converter 1 of the first embodiment shown in the second FIGS. 1 to 5 are combined and connected to the second three-phase connector 1c. That is, the output-side conductors 51U, 51V, 51W of the second power conversion device 1 of the first embodiment shown in FIGS. 1 to 5 constituting the first power conversion circuit unit 31 are the second three-phase connectors. It is connected to the three-phase stator winding of the second motor 13 via 1c.
The positive-side conductors PIU, PIV, and PIW of the second power conversion device 1 of the first embodiment shown in FIGS. 1 to 5 that constitute the second power conversion circuit unit 32 are combined into the positive electrode of the battery 11. It is connected to the terminal PB and the positive electrode side conductors PIU, PIV, and PIW of the power conversion device 1 of the first embodiment shown in FIGS. 1 to 5 constituting the first power conversion circuit unit 31. .
The negative-side conductors NIU, NIV, NIW of the second power conversion device 1 of the first embodiment shown in FIGS. 1 to 5 constituting the second power conversion circuit unit 32 are combined into the negative electrode of the battery 11. The terminal NB is connected to the negative conductors NIU, NIV, NIW of the power converter 1 of the first embodiment shown in FIGS. 1 to 5 constituting the first power converter circuit unit 31. .
The second power conversion circuit unit 32 converts the three-phase AC power input from the second motor 13 into DC power. The DC power converted by the second power conversion circuit unit 32 can be supplied to at least one of the battery 11 and the first power conversion circuit unit 31.

U-phase high-side arm element UH, U-phase low-side arm element UL, V-phase high-side arm element VH, V-phase low-side arm element VL, W-phase high-side arm element WH of the first power conversion circuit unit 31 shown in FIG. The W-phase low-side arm element WL includes the U-phase high-side arm element UH, the U-phase low-side arm element UL, and the V-phase high-side arm element of the power conversion device 1 according to the first embodiment shown in FIGS. This corresponds to VH, V-phase low-side arm element VL, W-phase high-side arm element WH, and W-phase low-side arm element WL.
The U-phase high-side arm element UH, U-phase low-side arm element UL, V-phase high-side arm element VH, V-phase low-side arm element VL, W-phase high-side arm element WH of the second power conversion circuit unit 32 shown in FIG. The W-phase low-side arm element WL includes the U-phase high-side arm element UH, the U-phase low-side arm element UL, and the V-phase high-side arm element of the power converter 1 according to the first embodiment shown in FIGS. This corresponds to VH, V-phase low-side arm element VL, W-phase high-side arm element WH, and W-phase low-side arm element WL.

In the example shown in FIG. 12, the electrode UHA1 (see FIG. 3) of the U-phase high-side arm element UH of the first power conversion circuit unit 31, the electrode VHA1 (see FIG. 3) of the V-phase high-side arm element VH, the W-phase high The electrode WHA1 (see FIG. 3) of the side arm element WH, the electrode UHA1 (see FIG. 3) of the U phase high side arm element UH of the second power conversion circuit unit 32, and the electrode VHA1 of the V phase high side arm element VH (see FIG. 3). The electrode WHA1 (see FIG. 3) of the W-phase high-side arm element WH is connected to the positive bus bar PI. The positive electrode bus bar PI is connected to the positive electrode bus bar 50 p of the capacitor unit 23.
The electrode ULB1 (see FIG. 3) of the U-phase low-side arm element UL of the first power conversion circuit unit 31, the electrode VLB1 (see FIG. 3) of the V-phase low-side arm element VL, and the electrode WLB1 of the W-phase low-side arm element WL (FIG. 3). Of the U-phase low-side arm element UL of the second power conversion circuit unit 32 (see FIG. 3), the electrode VLB1 of the V-phase low-side arm element VL (see FIG. 3), and the W-phase low-side arm element WL. The electrode WLB1 (see FIG. 3) is connected to the negative electrode bus bar NI. The negative electrode bus bar NI is connected to the negative electrode bus bar 50 n of the capacitor unit 23.

The connection point TI between the U-phase high-side arm element UH and the U-phase low-side arm element UL of the first power conversion circuit unit 31 in the example shown in FIG. 12 is the first embodiment shown in FIGS. This corresponds to the U-phase output-side conductor 51U of the power converter 1 of FIG. The connection point TI between the V-phase high-side arm element VH and the V-phase low-side arm element VL of the first power conversion circuit unit 31 in the example shown in FIG. 12 is the first embodiment shown in FIGS. This corresponds to the V-phase output-side conductor 51V of the power converter 1 of FIG. The connection point TI between the W-phase high-side arm element WH and the W-phase low-side arm element WL in the first power conversion circuit unit 31 in the example shown in FIG. 12 is the first embodiment shown in FIGS. This corresponds to the W-phase output-side conductor 51W of the power converter 1 of FIG.
The U-phase output-side conductor 51U, the V-phase output-side conductor 51V, and the W-phase output-side conductor 51W of the power converter 1 according to the first embodiment shown in FIGS. This corresponds to the first bus bar 51 in the example shown in FIG.

The connection point TI between the U-phase high-side arm element UH and the U-phase low-side arm element UL of the second power conversion circuit unit 32 in the example shown in FIG. 12 is the second embodiment shown in FIGS. This corresponds to the U-phase output-side conductor 51U of the power converter 1 of FIG. The connection point TI between the V-phase high-side arm element VH and the V-phase low-side arm element VL of the second power conversion circuit unit 32 in the example shown in FIG. 12 is the second embodiment shown in FIGS. This corresponds to the V-phase output-side conductor 51V of the power converter 1 of FIG. The connection point TI between the W-phase high-side arm element WH and the W-phase low-side arm element WL of the second power conversion circuit unit 32 in the example shown in FIG. 12 is the second embodiment shown in FIGS. This corresponds to the W-phase output-side conductor 51V of the power converter 1 of FIG.
The U-phase output-side conductor 51U, the V-phase output-side conductor 51V, and the W-phase output-side conductor 51W of the power conversion device 1 of the first embodiment shown in FIGS. This corresponds to the second bus bar 52 in the example shown in FIG.

In the example shown in FIG. 12, the first bus bar 51 of the first power conversion circuit unit 31 is connected to the first input / output terminal Q1. The first input / output terminal Q1 is connected to the first three-phase connector 1b. The connection point TI of each phase of the first power conversion circuit unit 31 is the stator winding of each phase of the first motor 12 via the first bus bar 51, the first input / output terminal Q1, and the first three-phase connector 1b. It is connected to the.
The second bus bar 52 of the second power conversion circuit unit 32 is connected to the second input / output terminal Q2. The second input / output terminal Q2 is connected to the second three-phase connector 1c. The connection point TI of each phase of the second power conversion circuit unit 32 is the stator winding of each phase of the second motor 13 via the second bus bar 52, the second input / output terminal Q2, and the second three-phase connector 1c. It is connected to the.

In the example shown in FIG. 12, the U-phase high-side arm element UH, the U-phase low-side arm element UL, the V-phase high-side arm element VH, the V-phase low-side arm element VL of the first power conversion circuit unit 31, W Phase high side arm element WH and W phase low side arm element WL include flywheel diodes.
Similarly, the U-phase high-side arm element UH, the U-phase low-side arm element UL, the V-phase high-side arm element VH, the V-phase low-side arm element VL, and the W-phase high-side arm of the second power conversion circuit unit 32. The element WH and the W-phase low-side arm element WL include a flywheel diode.

In the example shown in FIG. 12, the gate drive unit 29 includes the U-phase high-side arm element UH, the U-phase low-side arm element UL, the V-phase high-side arm element VH, and the V-phase low-side arm of the first power conversion circuit unit 31. Gate signals are input to the element VL, the W-phase high-side arm element WH, and the W-phase low-side arm element WL.
Similarly, the gate drive unit 29 includes a U-phase high-side arm element UH, a U-phase low-side arm element UL, a V-phase high-side arm element VH, a V-phase low-side arm element VL of the second power conversion circuit unit 32, Gate signals are input to the W-phase high-side arm element WH and the W-phase low-side arm element WL.
The first power conversion circuit unit 31 converts DC power input from the battery 11 through the third power conversion circuit unit 33 into three-phase AC power, and the AC power is transferred to the three-phase stator winding of the first motor 12. A U-phase current, a V-phase current, and a W-phase current are supplied. The second power conversion circuit unit 32 includes a U-phase high-side arm element UH, a U-phase low-side arm element UL, and a V-phase high side of the second power conversion circuit unit 32 synchronized with the rotation of the second motor 13. The three-phase of the second motor 13 is driven by the on (conduction) / off (cutoff) drive of the arm element VH, the V-phase low-side arm element VL, the W-phase high-side arm element WH, and the W-phase low-side arm element WL. The three-phase AC power output from the stator winding is converted to DC power.

In the example illustrated in FIG. 12, the third power conversion circuit unit 33 is configured by the power conversion device 1 of the second embodiment described above.
The third power conversion circuit unit 33 is a voltage control unit (VCU). The third power conversion circuit unit 33 includes a high-side arm element S1 for one phase and a low-side arm element S2.

  The electrode on the positive electrode side of the high side arm element S1 is connected to the positive electrode bus bar PV. The positive electrode bus bar PV is connected to the positive electrode bus bar 50 p of the capacitor unit 23. The electrode on the negative side of the low-side arm element S2 is connected to the negative bus bar NV. The negative electrode bus bar NV is connected to the negative electrode bus bar 50 n of the capacitor unit 23. The negative electrode bus bar 50 n of the capacitor unit 23 is connected to the negative electrode terminal NB of the battery 11. The electrode on the negative side of the high side arm element S1 is connected to the electrode on the positive side of the low side arm element S2. The high side arm element S1 and the low side arm element S2 include flywheel diodes.

  A third bus bar 53 that constitutes a connection point between the high-side arm element S 1 and the low-side arm element S 2 of the third power conversion circuit unit 33 is connected to one end of the reactor 22. The other end of the reactor 22 is connected to the positive terminal PB of the battery 11. The reactor 22 includes a coil and a temperature sensor that detects the temperature of the coil. The temperature sensor is connected to the electronic control unit 28 by a signal line.

  The third power conversion circuit unit 33 is based on the gate signals input from the gate drive unit 29 to the gate electrode of the high-side arm element S1 and the gate electrode of the low-side arm element S2, and the high-side arm element S1 and the low-side arm element S2 Is switched on (conductive) / off (shut off).

  The third power conversion circuit unit 33 has a first state in which the low-side arm element S2 is turned on (conductive) and the high-side arm element S1 is turned off (cut off) and the low-side arm element S2 is turned off (cut off) during boost ) And the second state in which the high-side arm element S1 is set to ON (conduction). In the first state, current flows sequentially to the positive terminal PB of the battery 11, the reactor 22, the low-side arm element S2, and the negative terminal NB of the battery 11, and the reactor 22 is DC-excited to accumulate magnetic energy. In the second state, an electromotive voltage (inductive voltage) is generated between both ends of the reactor 22 so as to prevent a change in magnetic flux resulting from the interruption of the current flowing through the reactor 22. The induced voltage due to the magnetic energy accumulated in the reactor 22 is superimposed on the battery voltage, and a boosted voltage higher than the voltage between the terminals of the battery 11 is generated between the positive bus bar PV and the negative bus bar NV of the third power conversion circuit unit 33. Applied.

  The third power conversion circuit unit 33 alternately switches between the second state and the first state during regeneration. In the second state, current flows sequentially to the positive bus bar PV, the high-side arm element S1, the reactor 22, and the positive terminal PB of the battery 11 of the third power conversion circuit unit 33, and the reactor 22 is DC-excited to generate magnetic energy. Accumulated. In the first state, an electromotive voltage (inductive voltage) is generated between both ends of the reactor 22 so as to prevent a change in magnetic flux resulting from the interruption of the current flowing through the reactor 22. The induced voltage due to the magnetic energy accumulated in the reactor 22 is stepped down, and the stepped-down voltage lower than the voltage between the positive bus bar PV and the negative bus bar NV of the third power conversion circuit unit 33 is reduced to the positive terminal PB and the negative terminal NB of the battery 11. Between.

  The capacitor unit 23 includes a first smoothing capacitor 41, a second smoothing capacitor 42, and a noise filter 43.

The first smoothing capacitor 41 is connected between the positive terminal PB and the negative terminal NB of the battery 11. The first smoothing capacitor 41 smoothes voltage fluctuations that occur due to the on / off switching operation of the high-side arm element S1 and the low-side arm element S2 during the regeneration of the third power conversion circuit unit 33.
The second smoothing capacitor 42 is provided between the positive bus bar PI and the negative bus bar NI of each of the first power conversion circuit unit 31 and the second power conversion circuit unit 32, and between the positive bus bar PV and the negative bus bar NV of the third power conversion circuit unit 33. Connected between. The second smoothing capacitor 42 is connected to a plurality of positive electrode bus bars PI and negative electrode bus bars NI, and positive electrode bus bars PV and negative electrode bus bars NV via a positive electrode bus bar 50p and a negative electrode bus bar 50n. The second smoothing capacitor 42 includes a U-phase high-side arm element UH, a U-phase low-side arm element UL, a V-phase high-side arm element VH, and a V-phase low-side arm of the first power conversion circuit unit 31 and the second power conversion circuit unit 32. Voltage fluctuations that occur with the on / off switching operation of the element VL, the W-phase high-side arm element WH, and the W-phase low-side arm element WL are smoothed. The second smoothing capacitor 42 smoothes voltage fluctuations that occur with the on / off switching operation of the high-side arm element S1 and the low-side arm element S2 during the boosting of the third power conversion circuit unit 33.

The noise filter 43 is provided between the positive bus bar PI and the negative bus bar NI of each of the first power conversion circuit unit 31 and the second power conversion circuit unit 32, and between the positive bus bar PV and the negative bus bar NV of the third power conversion circuit unit 33. It is connected. The noise filter 43 includes two capacitors connected in series. The connection point of the two capacitors is connected to the body ground of the vehicle 10 or the like.
The resistor 24 is connected between the positive bus bar PI and the negative bus bar NI of each of the first power conversion circuit unit 31 and the second power conversion circuit unit 32, and between the positive bus bar PV and the negative bus bar NV of the third power conversion circuit unit 33. It is connected.

The first current sensor 25 forms a connection point TI of each phase of the first power conversion circuit unit 31 and is disposed on the first bus bar 51 connected to the first input / output terminal Q1, and includes a U phase, a V phase, and Each current of the W phase is detected. The second current sensor 26 is disposed on a second bus bar 52 that forms a connection point TI of each phase of the second power conversion circuit unit 32 and is connected to the second input / output terminal Q2, and is configured to be U-phase, V-phase, and W-phase. The current of each phase is detected. The third current sensor 27 is disposed on a third bus bar 53 that forms a connection point between the first transistor S1 and the second transistor S2 and is connected to the reactor 22, and detects a current flowing through the reactor 22.
Each of the first current sensor 25, the second current sensor 26, and the third current sensor 27 is connected to the electronic control unit 28 by a signal line.

  The electronic control unit 28 controls each operation of the first motor 12 and the second motor 13. For example, the electronic control unit 28 is a software function unit that functions when a predetermined program is executed by a processor such as a CPU (Central Processing Unit). The software function unit is an ECU (Electronic Control Unit) including a processor such as a CPU, a ROM (Read Only Memory) that stores a program, a RAM (Random Access Memory) that temporarily stores data, and an electronic circuit such as a timer. is there. Note that at least a part of the electronic control unit 28 may be an integrated circuit such as an LSI (Large Scale Integration). For example, the electronic control unit 28 performs current feedback control using the current detection value of the first current sensor 25 and the current target value corresponding to the torque command value for the first motor 12, and the like, and inputs it to the gate drive unit 29. Generate a control signal. For example, the electronic control unit 28 performs current feedback control using the current detection value of the second current sensor 26 and the current target value corresponding to the regenerative command value for the second motor 13, and the like, and inputs it to the gate drive unit 29. Generate a control signal. The control signals are the U-phase high-side arm element UH, U-phase low-side arm element UL, V-phase high-side arm element VH, V-phase low-side arm element VL of the first power conversion circuit unit 31 and the second power conversion circuit unit 32, It is a signal indicating timing for driving the W-phase high-side arm element WH and the W-phase low-side arm element WL on (conductive) / off (cut off). For example, the control signal is a pulse width modulated signal or the like.

Based on the control signal received from the electronic control unit 28, the gate drive unit 29 is configured to output the U-phase high-side arm element UH, U-phase low-side arm element UL, V-phase of the first power conversion circuit unit 31 and the second power conversion circuit unit 32. A gate signal is generated to actually drive the high-side arm element VH, the V-phase low-side arm element VL, the W-phase high-side arm element WH, and the W-phase low-side arm element WL. For example, the gate drive unit 29 performs control signal amplification, level shift, and the like to generate a gate signal.
The gate drive unit 29 generates a gate signal for driving each of the high-side arm element S1 and the low-side arm element S2 of the third power conversion circuit unit 33 to be on (conductive) / off (blocked). For example, the gate drive unit 29 generates a gate signal having a duty ratio corresponding to the boost voltage command at the time of boosting of the third power conversion circuit unit 33 or the step-down voltage command at the time of regeneration of the third power conversion circuit unit 33. The duty ratio is a ratio of the high side arm element S1 and the low side arm element S2.

In the example described above, two power conversion devices 1 according to the first embodiment shown in FIGS. 1 to 5 are applied to the vehicle 10 shown in FIG. 12, and one power conversion device 1 according to the second embodiment is used. One has been applied.
In another example, you may apply the power converter device 1 of 1st Embodiment shown in FIGS. 6-8 instead of applying the power converter device 1 of 1st Embodiment shown in FIGS. Alternatively, instead of applying the power conversion device 1 of the first embodiment shown in FIGS. 1 to 5, the power conversion device 1 of the third embodiment shown in FIGS. 9 to 12 may be applied.

  In the example shown in FIG. 12, the power conversion device 1 of the first to third embodiments is applied to the vehicle 10, but in other examples, for example, an elevator, a pump, a fan, a railway vehicle, an air conditioner, a refrigerator, a laundry The power conversion device 1 of the first to third embodiments may be applied to things other than the vehicle 10 such as a machine.

  The embodiments of the present invention are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Power converter, WJA ... Radiating part, WJA1UH ... Refrigerant flow path, WJA1UL ... Refrigerant flow path, WJA1VH ... Refrigerant flow path, WJA1VL ... Refrigerant flow path, WJA1WH ... Refrigerant flow path, WJA1WL ... Refrigerant flow path, WJA1IN ... Refrigerant Flow path inlet, WJA1OUT ... refriger flow path outlet, WJA2UH ... mounting surface, WJA2UL ... mounting surface, WJA2VH ... mounting surface, WJA2VL ... mounting surface, WJA2WH ... mounting surface, WJA2WL ... mounting surface, UH ... high side arm element, UHA ... plane, UHA1 ... electrode, UHB ... plane, UHB1 ... electrode, UHB2 ... gate electrode, UL ... low-side arm element, ULA ... plane, ULA1 ... electrode, ULB ... plane, ULB1 ... electrode, ULB2 ... gate electrode, VH ... High side arm element, VHA1 ... electrode, VHB1 ... electrode, VHB2 ... gate electrode, L: Low side arm element, VLA1 ... Electrode, VLB1 ... Electrode, VLB2 ... Gate electrode, WH ... High side arm element, WHA1 ... Electrode, WHB1 ... Electrode, WHB2 ... Gate electrode, WL ... Low side arm element, WLA1 ... Electrode, WLB1 ... Electrode, WLB2 ... Gate electrode, PIU ... Positive electrode side conductor, PIV ... Positive electrode side conductor, PIW ... Positive electrode side conductor, 51U ... Output side conductor, 51V ... Output side conductor, 51W ... Output side conductor, NIU ... negative electrode side conductor, NIV ... negative electrode side conductor, NIW ... negative electrode side conductor, 10 ... vehicle

Claims (5)

A heat dissipating part having a refrigerant flow path through which the refrigerant flows, a first mounting surface, and a second mounting surface parallel to the first mounting surface;
A high-side arm element and a low-side arm element are arranged in a first direction parallel to the first mounting surface and the second mounting surface;
The position of the high-side arm element in the first direction is shifted from the position of the low-side arm element;
The first mounting surface on which the high-side arm element is mounted and the second mounting surface on which the low-side arm element is mounted are in a second direction orthogonal to the first mounting surface and the second mounting surface. They are offset from each other,
Power conversion device. A positive electrode side conductor;
An output-side conductor;
A negative electrode side conductor,
A first electrode is disposed on one surface of the high-side arm element,
A second electrode is disposed on the other surface of the high side arm element,
A first electrode is disposed on one surface of the low-side arm element,
A second electrode is disposed on the other surface of the low-side arm element,
The high-side arm element and the low-side arm element are arranged at a position overlapping the output-side conductor when viewed in the second direction,
A first electrode of the high-side arm element is electrically connected to the positive-side conductor;
A second electrode of the high-side arm element is electrically connected to one surface of the output-side conductor;
A first electrode of the low-side arm element is electrically connected to the other surface of the output-side conductor;
A second electrode of the low-side arm element is electrically connected to the negative electrode-side conductor;
The power conversion device according to claim 1. The high side arm element and the positive electrode side conductor are disposed on one surface side of the output side conductor,
The low side arm element and the negative electrode side conductor are disposed on the other surface side of the output side conductor,
The power conversion device according to claim 2. The heat dissipating part is disposed on the opposite side of the high side arm element across the positive electrode side conductor in the second direction,
Between the heat radiating portion and the positive electrode side conductor, an electrical insulation treatment is performed,
The heat dissipating part is disposed on the opposite side of the low-side arm element across the output-side conductor in the second direction.
Between the heat radiating part and the output-side conductor, an electrical insulation treatment is performed,
The power conversion device according to claim 2 or claim 3. With other heat dissipation parts,
The other heat radiating portion is disposed on the opposite side of the low-side arm element across the negative electrode-side conductor in the second direction,
Between the other heat radiating portion and the low side arm element, an electrical insulation treatment is performed,
The other heat radiating portion is disposed on the opposite side of the high-side arm element across the output-side conductor in the second direction.
Between the other heat radiating portion and the output-side conductor, an electrical insulation treatment is performed,
The power converter device as described in any one of Claims 2-4.

Images