CN209434173U - power conversion device - Google Patents

Abstract

The utility model provides a power conversion device capable of reducing the overall size of the power conversion device in a direction parallel to the mounting surfaces of the high-side arm element and the low-side arm element. The power conversion device includes: a heat dissipation part having a refrigerant flow path through which refrigerant flows, a first mounting surface, and a second mounting surface parallel to the first mounting surface; and an element row along the first mounting surface. High side arm elements and low side arm elements are arranged in a first direction parallel to the second mounting surface, the position of the high side arm element in the first direction deviates 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 located on a second mounting surface orthogonal to the first mounting surface and the second mounting surface. They are arranged offset from each other in 2 directions. The present invention can reduce the size of the power conversion device in the direction parallel to the mounting surfaces of the high-side arm element and the low-side arm element.

Description

power conversion device

technical field

The utility model relates to a power conversion device.

Background technique

Conventionally, there is known a semiconductor device provided with a cooler that improves the shape of the connection portion of the inlet port/discharge port of the coolant so as to reduce the pressure loss in the connection portion (see, for example, Patent Document 1). The cooler of this kind of semiconductor device has: an introduction port and a discharge port, which are arranged on the opposite side walls of the case (case) and at diagonal positions; an introduction path, connected to the introduction port, and formed in the case; a discharge path , connected to the discharge port, and formed in the housing; and a cooling flow path between the introduction path and the discharge path.

[Prior art literature]

[Patent Document]

Patent Document 1: Japanese Patent Laid-Open No. 2015-079819

Utility model content

[Problems to be solved by the utility model]

However, in such a semiconductor device, sufficient attention has not been paid to how the plurality of semiconductor elements should be arranged. Therefore, in the above-mentioned semiconductor device, the entire semiconductor device cannot be sufficiently miniaturized.

In view of the above problems, an object of the present invention is to provide a power conversion device capable of converting power in a direction parallel to a mounting surface of a high side arm element and a low side arm element. The size of the device is miniaturized.

[Technical means to solve the problem]

(1) A power conversion device according to an embodiment of the present invention includes: a heat dissipation unit 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; and The component row is arranged with high side arm components and low side arm components along a first direction parallel to the first mounting surface and the second mounting surface, and the position of the high side arm component in the first direction is The position of the low-side arm element is 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 in the same position as the first mounting surface. and the second mounting surface are arranged to deviate from each other in a second direction perpendicular to the second mounting surface.

(2) The power conversion device described in (1) may also include a positive-side conductor, an output-side conductor, and a negative-side conductor, and a first electrode is disposed on one side of the high-side arm element, On the other side of the high-side arm element, a second electrode is arranged, on one side of the low-side arm element, a first electrode is arranged, and on the other side of the low-side arm element, a second electrode is arranged , the high-side arm element and the low-side arm element are arranged at a position overlapping with the output-side conductor when viewed along the second direction, and the first electrode of the high-side arm element is electrically connected to the The positive side conductor, the second electrode of the high-side arm element is electrically connected to one side of the output-side conductor, and the first electrode of the low-side arm element is electrically connected to the other side of the output-side conductor On the one hand, the second electrode of the low side arm element is electrically connected to the negative side conductor.

(3) In the power conversion device described in (2), the high-side arm element and the positive-side conductor may be located on one side of the output-side conductor, and the low-side The arm element and the negative-side conductor are disposed on the other side of the output-side conductor.

(4) In the power conversion device described in (2) or (3), the heat dissipation portion may be disposed on the high side in the second direction with the positive electrode side conductor interposed therebetween. On the opposite side of the arm element, an electrical insulation process is applied between the heat dissipation portion and the positive electrode side conductor, and the heat dissipation portion is disposed on the output side conductor in the second direction. On the opposite side of the low-side arm element, electrical insulation treatment is implemented between the heat dissipation part and the output-side conductor.

(5) The power conversion device described in any one of (2) to (4) above may include another heat dissipation portion that is separated from the negative electrode side in the second direction. Conductors are arranged on the opposite side of the low-side arm element, and electrical insulation treatment is implemented between the other heat dissipation part and the low-side arm element. The other heat dissipation part is in the second direction It is disposed on the opposite side of the high-side arm element with the output-side conductor interposed therebetween, and an electrical insulation process is performed between the other heat dissipation portion and the output-side conductor.

[effect of utility model]

In the power conversion device described in (1), the high-side arm element and the low-side arm element are arranged so as to deviate 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 2nd direction. As a result, although the high side arm element and the low side arm element are arranged offset 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, compared with the case where the high-side arm element and the low-side arm element are arranged without being deviated from each other in the second direction, it is possible to reduce the size of the power conversion device in the first direction. That is, the size of the power conversion device in the first direction parallel to the mounting surfaces of the high-side arm element and the low-side arm element can be reduced.

In the power conversion device described in (2), 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 electric conductor is shared by the high-side arm element and the low-side arm element. Therefore, compared with the case of separately providing the output-side conductor for the high-side arm element and the output-side conductor for the low-side arm element, the number of parts and assembly man-hours can be reduced, and the size of the power conversion device can be reduced. .

In the power conversion device described in (3), the positive-side conductor is disposed on one side of the output-side conductor, and the negative-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 offset from each other in the second direction. Therefore, an 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 distance between the positive-electrode-side conductor and the negative-electrode-side conductor in the first direction can be reduced. Therefore, compared with the case where the positive electrode side conductor and the negative electrode side conductor are arranged without being deviated from each other in the second direction, it is possible to reduce the size of the power conversion device in the first direction.

In the power conversion device described in (4), the heat dissipation part is disposed on the opposite side of the high-side arm element across the positive electrode side conductor in the second direction, and the heat dissipation part and the positive electrode side conductor are provided with a Electrical insulation treatment. Therefore, it is possible to cool the high-side arm element through the heat dissipation portion while ensuring electrical insulation between the heat dissipation portion and the positive electrode side conductor.

Furthermore, in the power conversion device described in (4), the heat dissipation portion is arranged on the opposite side of the low-side arm element across the output-side conductor in the second direction, and between the heat dissipation portion and the output-side conductor, Implement electrical insulation treatment. Therefore, while ensuring electrical insulation between the heat dissipation portion and the output-side conductor, the low-side arm element can be cooled through the heat dissipation portion.

The power conversion device described in (5) above includes another heat dissipation unit. Therefore, the cooling performance can be improved compared to the case where another heat dissipation portion is not provided.

In addition, in the power conversion device described in (5), the other heat dissipation portion is arranged on the opposite side of the low side arm element across the negative electrode side conductor in the second direction, and the other heat dissipation portion conducts electricity with the negative electrode side. Between the bodies, there is electrical insulation treatment. Therefore, it is possible to cool the low-side arm element through the other heat radiating portion while ensuring electrical insulation between the other heat radiating portion and the negative electrode side conductor.

In addition, in the power conversion device described in (5), the other heat dissipation 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 dissipation portion and the output side Between the conductors, there is electrical insulation treatment. Therefore, the electrical insulation between the other heat dissipation portion and the output-side conductor can be ensured, and the high-side arm element can be cooled through the other heat dissipation portion.

Description of drawings

FIG. 1 is a diagram showing an example of a schematic vertical cross-section of a power conversion device according to a first embodiment.

FIG. 2 is a diagram showing only the heat dissipation portion in FIG. 1 .

Figure 3 only extracts the U-phase high-side arm components, U-phase low-side arm components, V-phase high-side arm components, V-phase low-side arm components, W-phase high-side arm components, and W-phase low-side arm components in Figure 1 And the graph that represents.

FIG. 4 is a diagram showing only the U-phase output-side conductors, the V-phase output-side conductors, and the W-phase output-side conductors in FIG. 1 .

FIG. 5 is a schematic perspective view of an example of the power conversion device of the first embodiment shown in FIG. 1 .

6(A) and 6(B) are diagrams showing another example of the power conversion device according to the first embodiment.

7(A) to 7(C) are three views of the power conversion device shown in FIG. 6(A).

Fig. 8 is a view showing the flow of refrigerant in the heat dissipation portion shown in Figs. 6(A) and 6(B) and Figs. 7(A) to 7(C).

9(A) and 9(B) are diagrams showing an example of the power conversion device according to the third embodiment.

10(A) to 10(C) are three views of the power conversion device shown in FIG. 9(A).

Fig. 11 is a diagram showing the flow of refrigerant in the heat dissipation portion shown in Figs. 9(A) and 9(B) and Figs. 10(A) to 10(C).

FIG. 12 is a diagram showing an example of a part of a vehicle to which the power conversion devices according to the first to third embodiments are applicable.

Explanation of reference signs

1: Power conversion device

WJA: Cooling Department

WJA1UH, WJA1UL, WJA1VH, WJA1VL, WJA1WH, WJA1WL: Refrigerant flow path

WJA1IN: Refrigerant flow path inlet

WJA1OUT: Refrigerant flow path outlet

WJA2UH, WJA2UL, WJA2VH, WJA2VL, WJA2WH, WJA2WL: mounting surface

UH, VH, WH: high sidearm elements

UHA, UHB, ULA, ULB: surface

UHA1, UHB1, ULA1, ULB1, VHA1, VHB1, VLA1, VLB1, WHA1, WHB1, WLA1, WLB1: electrodes

UHB2, ULB2, VHB2, VLB2, WHB2, WLB2: Gate

UL, VL, WL: Low sidearm elements

PIU, PIV, PIW: Positive side conductor

51U, 51V, 51W: Output conductor

NIU, NIV, NIW: Negative side conductor

10: Vehicle

Detailed ways

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

<First Embodiment>

FIG. 1 is a diagram showing an example of a schematic vertical cross section of a power conversion device 1 according to the first embodiment. FIG. 2 is a diagram showing only the heat dissipation portion WJA in FIG. 1 . Figure 3 only extracts 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, and W-phase high-side arm elements WH, W in Figure 1 The figure shown with respect to the lower side arm element WL. Fig. 4 only extracts the U-phase output side conductor (U-phase output bus bar (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) 51V in Fig. 1 . output bus) 51W and the diagram shown. FIG. 5 is a schematic perspective view of an example of the power conversion device 1 of the first embodiment shown in FIG. 1 .

In the example shown in FIGS. 1 to 5 , the power conversion device 1 includes a heat sink 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 side conductor (U-phase P bus bar) PIU, V-phase positive side conductor (V-phase P bus bar) PIV, W-phase positive side Conductor (W phase P bus bar) PIW, U phase negative side conductor (U phase N bus bar) NIU, V phase negative side conductor (V phase N bus bar) NIV, W phase negative side conductor (W phase N bus bar) NIW, U-phase output conductor (U-phase output busbar) 51U, V-phase output conductor (V-phase output busbar) 51V, W-phase output conductor (W-phase output busbar) 51W, U-phase high-side gate 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, 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 partition SPWL, U-phase high-side heat pipe HPUH, 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.

In the examples shown in Fig. 1 to Fig. 5, the heat dissipation part WJA has 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 element. The side arm element WH and the W-phase low side arm element WL are cooled. Radiator WJA includes refrigerant passages WJA1UH, WJA1UL, WJA1VH, WJA1VL, WJA1WH, and WJA1WL through which 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 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 refrigerant flow path WJA1VL mainly cools V-phase low 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 arm element WL.

As shown in FIG. 2 , the heat dissipation unit 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. Mounting surfaces WJA2UH, WJA2UL, WJA2VH, WJA2VL, WJA2WH, WJA2WL are parallel to each other.

As shown in FIGS. 1 , 2 and 5 , the U-phase high-side arm element UH is mounted on the mounting surface WJA2UH. On the mounting surface WJA2UL, the U-phase low side arm element UL is mounted. On mounting surface WJA2VH, V-phase high side arm element VH is mounted. On mounting surface WJA2VL, V-phase low-side arm element VL is mounted. W-phase high side arm element WH is mounted on mounting surface WJA2WH. W-phase low side arm element WL is mounted on mounting surface WJA2WL.

In the examples shown in FIGS. 1 to 5 , the high-side arm elements UH, VH, WH and the low-side arm elements UL, VL, and WL are, for example, insulated gate bipolar transistors (Insulated Gate Bipolar Transistor, IGBT), metal oxide semiconductor A switching element such as a field effect transistor (Metal Oxide Semi-conductor Field Effect Transistor, MOSFET).

As shown in FIG. 3 , the U-phase high side arm element UH includes one side UHA and the other side UHB. On one side of UHA, an electrode UHA1 is arranged. On the other surface UHB, an electrode UHB1 and a gate UHB2 are arranged.

As shown in FIG. 1 , FIG. 3 and FIG. 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 UHB2 of U-phase high-side arm element UH.

As shown in FIG. 1 , FIG. 4 and FIG. 5 , electrode UHB1 of U-phase high arm element UH is arranged to face one surface 51UA of U-phase output side conductor 51U. That is, U-phase high-side arm element UH is arranged at a position overlapping with U-phase output-side conductor 51U when viewed in the height direction. Furthermore, the U-phase high-side arm element UH and the U-phase positive electrode-side conductor PIU are arranged on the one surface 51UA side of the U-phase output-side conductor 51U.

As shown in FIG. 3 , the U-phase low-side arm element UL includes one side ULA and the other side ULB. On one side of ULA, an electrode ULA1 is arranged. On the other surface ULB, an electrode ULB1 and a gate ULB2 are arranged.

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-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. The U-phase low-side gate signal line GUL is electrically connected to the gate ULB2 of the U-phase low-side arm element UL.

As shown in FIGS. 1 , 4 and 5 , the electrode ULA1 of the U-phase low arm element UL is arranged 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 arranged at a position overlapping with the U-phase output-side conductor 51U when viewed in the height direction. Furthermore, the U-phase low-side arm element UL and the U-phase negative-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 ). Electrode VHA1 is arranged on one surface of V-phase high side arm element VH. On the other surface of V-phase high side arm element VH, electrode VHB1 and gate VHB2 are arranged.

As shown in FIG. 1 , FIG. 3 and FIG. 5 , the V-phase positive-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 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 arm element VH is arranged to face one of the surfaces 51VA of the V-phase output side conductor 51V. Furthermore, the V-phase high-side arm element VH and the V-phase positive-side conductor PIV are arranged on the 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 ). On one surface of V-phase low arm element VL, electrode VLA1 is arranged. On the other surface of V-phase low arm element VL, electrode VLB1 and gate VLB2 are arranged.

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. V-phase negative-side conductor NIV is electrically connected to electrode VLB1 of V-phase low-side arm element VL via V-phase low-side spacer SPVL. The V-phase low-side gate signal line GVL is electrically connected to the gate VLB2 of the 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 arranged to face the other surface 51VB of the V-phase output-side conductor 51V. Furthermore, the V-phase low-side arm element VL and the V-phase negative-side conductor NIV are arranged 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 ). Electrode WHA1 is arranged on one surface of W-phase high side arm element WH. On the other surface of the W-phase high side arm element WH, an electrode WHB1 and a gate WHB2 are arranged.

As shown in FIG. 1 , FIG. 3 and FIG. 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. W-phase output-side conductor 51W is electrically connected to electrode WHB1 of W-phase high-side arm element WH via W-phase high-side spacer SPWH. W-phase high-side gate signal line GWH is electrically connected to gate WHB2 of 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 arranged to face one of the surfaces 51WA of the W-phase output-side conductor 51W. Furthermore, the W-phase high-side arm element WH and the W-phase positive-side conductor PIW are arranged on the side of one surface 51WA of the W-phase output-side conductor 51W.

As shown in FIG. 3 , the W-phase low side arm element WL includes one surface (the lower surface in FIG. 3 ) and the other surface (the upper surface in FIG. 3 ). Electrode WLA1 is disposed on one surface of W-phase low arm element WL. On the other surface of the W-phase low arm element WL, an electrode WLB1 and a gate WLB2 are arranged.

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-side conductor NIW is electrically connected to the electrode WLB1 of the W-phase low-side arm element WL via the W-phase low-side spacer SPWL. W-phase low-side gate signal line GWL is electrically connected to gate 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 arm element WL is arranged to face the other surface 51WB of the W-phase output-side conductor 51W. Furthermore, the W-phase low-side arm element WL and the W-phase negative-side conductor NIW are arranged on the other surface 51WB side of the W-phase output-side conductor 51W.

As shown in FIGS. 1 , 2 and 5 , mounting surface WJA2UH of heat sink WJA is disposed on the opposite side of U-phase high-side arm element UH across U-phase positive-side conductor PIU in the height direction. Furthermore, between the mounting surface WJA2UH of the heat sink WJA and the U-phase positive-electrode-side conductor PIU, for example, an electrical insulation treatment such as alumite treatment is given.

Mounting surface WJA2UL of heat sink WJA is disposed on the opposite side of U-phase low-side arm element UL across U-phase output-side conductor 51U in the height direction. Furthermore, between the mounting surface WJA2UL of the heat sink WJA and the U-phase output-side conductor 51U, an electrical insulation treatment such as alumite treatment or the like is given, for example.

Mounting surface WJA2VH of heat sink WJA is arranged on the opposite side of V-phase high-side arm element VH across V-phase positive-side conductor PIV in the height direction. Furthermore, between the mounting surface WJA2VH of the heat dissipation portion WJA and the V-phase positive electrode side conductor PIV, an electrical insulation treatment such as alumite treatment is applied, for example.

Mounting surface WJA2VL of heat sink WJA is arranged on the opposite side of V-phase low-side arm element VL across V-phase output-side conductor 51V in the height direction. Furthermore, between the mounting surface WJA2VL of the heat dissipation portion WJA and the V-phase output side conductor 51V, an electrical insulation treatment such as alumite treatment or the like is given, for example.

The mounting surface WJA2WH of the heat sink WJA is disposed on the opposite side of the W-phase high-side arm element WH with the W-phase positive-side conductor PIW interposed therebetween in the height direction. Furthermore, between the mounting surface WJA2WH of the heat sink WJA and the W-phase positive-electrode-side conductor PIW, for example, an electrical insulation treatment such as alumite treatment is given.

Mounting surface WJA2WL of heat sink WJA is arranged on the opposite side of W-phase low-side arm element WL across W-phase output-side conductor 51W in the height direction. Furthermore, between the mounting surface WJA2WL of the heat sink WJA and the W-phase output-side conductor 51W, an electrical insulation treatment such as alumite treatment or the like is given, for example.

In the examples shown in FIGS. 1 to 5 , the U-phase high-side heat pipe HPUH is arranged 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. The U-phase low-side heat pipe HPUL is arranged 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.

The V-phase high-side heat pipe HPVH 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. The V-phase low-side heat pipe HPVL 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.

The W-phase high-side heat pipe HPWH 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. The W-phase low-side heat pipe HPWL is arranged on the opposite side of the W-phase low-side arm element WL with the W-phase negative electrode-side conductor NIW interposed therebetween 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 a first direction D1 (left-right direction in FIG. 1 ) to form a U-phase element row. The V-phase high-side arm element VH and the V-phase low-side arm element VL are arranged along the first direction D1 to form a V-phase element row. The W-phase high-side arm element WH and the W-phase low-side arm element WL are arranged along the first direction D1 to constitute a W-phase element row.

As shown in FIG. 1 and FIG. 2, the mounting surface WJA2UH of the heat dissipation part WJA on which the U-phase high-side arm element UH is mounted, and the mounting surface WJA2UL of the heat dissipation part WJA on which the U-phase low-side arm element UL is mounted are aligned with each other in the first direction D1. The orthogonal height direction DH (the vertical direction in FIGS. 1 and 2 ) and the height direction DH perpendicular to the mounting surface WJA2UH and the mounting surface WJA2UL are arranged so as to be deviated from each other. 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 deviate.

In the examples shown in FIGS. 1 to 5, as described above, although the position of the U-phase high-side arm element UH in the first direction D1 deviates from the position of the U-phase low-side arm element UL, it can be ensured in the height direction. Insulation distance between U phase high side arm element UH and U phase low side arm element UL. 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 of the U-phase high arm element UH in the first direction D1 is aligned with the right end of the U-phase low arm element UL.

As shown in FIGS. 1 and 2 , the mounting surface WJA2VH of the heat sink WJA on which the V-phase high side arm element VH is mounted and the mounting surface WJA2VL of the heat sink WJA on which the V-phase low side arm element VL is mounted are deviated from each other in the height direction DH. configuration.

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 deviate.

Specifically, in the example shown in FIG. 1 , the left end of the V-phase high arm element VH in the first direction D1 is aligned with the right end of the V-phase low arm element VL. Furthermore, the left end portion of the V-phase low arm element VL in the first direction D1 is aligned with the right end portion of the U-phase high arm element UH.

As shown in FIGS. 1 and 2 , the mounting surface WJA2WH of the heat sink WJA on which the W-phase high-side arm element WH is mounted, and the mounting surface WJA2WL of the heat sink WJA on which the W-phase low-side arm element WL is mounted are deviated from each other in the height direction DH. ground configuration.

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 deviate.

Specifically, in the example shown in FIG. 1 , the left end portion of the W-phase high side arm element WH in the first direction D1 is aligned with the right end portion of the W-phase low side arm element WL. Furthermore, the left end of the W-phase low arm element WL in the first direction D1 is aligned with the right end of the V-phase high arm element VH.

Therefore, in the examples shown in FIGS. 1 to 5 , the V-phase in the first direction D1 is higher than 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. The distance between the side arm element VH and the V-phase 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 in the first direction D1 The distance between the element UH and the V-phase low-side arm element VL and 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 can make the power conversion in the first direction D1 The size of the device 1 is miniaturized.

Moreover, in the examples shown in FIGS. 1 to 5, the U-phase output-side conductor 51U is shared by the U-phase high-side arm element UH and the U-phase low-side arm element UL, and the V-phase high-side arm element VH and the V-phase low-arm element The 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 of separately providing the output-side conductor for the high-side arm element and the output-side conductor for the low-side arm element, the number of parts and assembly man-hours can be reduced, and the overall size of the power conversion device 1 can be reduced. miniaturization.

Furthermore, in the examples shown in FIGS. 1 to 5 , the U-phase positive-side conductor PIU and the U-phase negative-side conductor NIU are arranged to deviate from each other in the height direction DH, and the V-phase positive-side conductor PIV and the V-phase negative-side conductor are arranged to be offset from each other. The conductors NIV are arranged offset 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 arranged offset 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, V The insulation distance between the phase positive side conductor PIV and the V phase negative side conductor NIV, and the insulation distance between the W phase positive side conductor PIW and the W phase negative side conductor NIW.

1 to 5, between the mounting surface WJA2UH of the heat dissipation unit WJA and the U-phase positive electrode side conductor PIU, between the mounting surface WJA2UL of the heat dissipation unit WJA and the U-phase output side conductor 51U, Between the mounting surface WJA2VH of the radiator WJA and the V-phase positive conductor PIV, between the mounting surface WJA2VL of the radiator WJA and the V-phase output conductor 51V, between the mounting surface WJA2WH of the radiator WJA and the W-phase positive conductor Between the PIWs and between the mounting surface WJA2WL of the heat sink WJA and the W-phase output-side conductor 51W, an electrical insulation process is given. Therefore, the necessary electrical insulation can be ensured, and 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 The arm element WH and the W-phase low-side arm element WL are cooled.

6(A) and 6(B) are diagrams showing another example of the power conversion device 1 according to the first embodiment. In detail, FIG. 6(A) is a perspective view of the power conversion device 1 after the heat sink WJA is assembled. FIG. 6(B) is a perspective view of the power conversion device 1 before the heat sink WJA is assembled.

7(A) to 7(C) are three views of the power conversion device 1 shown in FIG. 6(A). Specifically, FIG. 7(A) is a left side view of the power conversion device 1 shown in FIG. 6(A) viewed from the front left side of FIG. 6(A). FIG. 7(B) is a front view of the power conversion device 1 shown in FIG. 6(A) viewed from the right front side of FIG. 6(A) . FIG. 7(C) is a plan view of the power conversion device 1 shown in FIG. 6(A) viewed from the upper side of FIG. 6(A) .

Fig. 8 is a diagram showing the flow of refrigerant in the heat dissipation portion WJA shown in Figs. 6(A) and 6(B) and Figs. 7(A) to 7(C).

In the examples 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, a V-phase low-side heat pipe HPVL, and a W-phase high-side heat pipe HPWH. And the W-phase low-side heat pipe HPWL.

On the other hand, in the examples shown in FIGS. 6(A) to 8 , the power conversion device 1 does not include these parts.

In the example shown in FIG. 6(A) to FIG. 8 , the heat radiation portion WJA includes a refrigerant flow path inlet portion WJA1IN and a refrigerant flow path outlet portion WJA1OUT.

Refrigerant flowing into the radiator WJA from the inlet WJA1IN of the refrigerant passage flows through the refrigerant passages WJA1UH, WJA1UL, WJA1VH, WJA1VL, WJA1WH, WJA1WL, and flows out to the radiator WJA through the outlet WJA1OUT of the refrigerant passage outside.

<Second Embodiment>

Hereinafter, a second embodiment of the power conversion device 1 of the present invention will be described.

The power conversion device 1 of the second embodiment is configured in the same manner as the power conversion device 1 of the first embodiment except for points described later. Therefore, according to the power conversion device 1 of the second embodiment, the same effects as those of the power conversion device 1 of the first embodiment can be achieved except for the points described later.

The power conversion device 1 of the first embodiment shown in FIGS. The device 1 has only one-phase constituent elements such as U-phase constituent elements.

That is, the power conversion device 1 according to the second embodiment includes, for example, a radiator WJA (see FIGS. 1 and 2 ), refrigerant passages WJA1UH and WJA1UL (see FIG. 1 ) through which the refrigerant flows, and a mounting surface WJA2UH (see FIGS. 2), and the mounting surface WJA2UL parallel to the mounting surface WJA2UH (refer to FIG. 2); and the component row, the high side arm element UH (refer to FIG. 1) and the low side arm component UH (refer to FIG. 1) are arranged along the first direction D1 (refer to FIG. 1). Component UL (refer to Figure 1).

In the power conversion device 1 according to 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 aligned in the height direction DH (see Figure 1 ) perpendicular to the first direction D1. vertical direction) and the height direction DH perpendicular to the mounting surface WJA2UH and the mounting surface WJA2UL are arranged so as to deviate 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-right direction of FIG. 1 ) deviate.

<Third embodiment>

Hereinafter, a third embodiment of the power conversion device 1 of the present invention will be described with reference to the drawings.

The power conversion device 1 of the third embodiment is configured in the same manner as the power conversion device 1 of the first embodiment except for points described later. Therefore, according to the power conversion device 1 of the third embodiment, the same effects as those of the power conversion device 1 of the first embodiment are exhibited except for the points described later.

The power conversion device 1 of the first embodiment shown in FIGS. 1 to 8 includes a heat dissipation unit WJA, but the power conversion device 1 of the second embodiment includes a heat dissipation unit WJB in addition to the heat dissipation unit WJA.

9(A) and 9(B) are diagrams showing an example of the power conversion device 1 according to the third embodiment. Specifically, FIG. 9(A) is a perspective view of the power conversion device 1 after the heat dissipation unit WJA and the heat dissipation unit WJB are assembled. FIG. 9(B) is a perspective view of the power conversion device 1 before the heat dissipation unit WJA and the heat dissipation unit WJB are assembled.

10(A) to 10(C) are three views of the power conversion device 1 shown in FIG. 9(A). Specifically, FIG. 10(A) is a left side view of the power conversion device 1 shown in FIG. 9(A) viewed from the front left side of FIG. 9(A). FIG. 10(B) is a front view of the power conversion device 1 shown in FIG. 9(A) viewed from the right front side of FIG. 9(A) . FIG. 10(C) is a plan view of the power conversion device 1 shown in FIG. 9(A) viewed from the upper side of FIG. 9(A) .

Fig. 11 is a view showing the flow of refrigerant in the heat dissipation portion WJB shown in Figs. 9(A) and 9(B) and Figs. 10(A) to 10(C) .

In the examples shown in FIG. 9(A) to FIG. 11 , the radiator WJB faces the U-phase high-side arm element UH, the U-phase low-side arm element UL, and the V-phase high-side arm elements VH, V from the side opposite to the heat dissipation portion WJA. The phase low arm element VL, the W phase high arm element WH, and the W phase low arm element WL are cooled. Radiator WJB includes refrigerant passages WJB1UH, WJB1UL, WJB1VH, WJB1VL, WJB1WH, and WJB1WL through which refrigerant flows.

Furthermore, the radiator WJB includes a refrigerant flow path inlet portion WJB1IN and a refrigerant flow path outlet portion WJB1OUT.

Refrigerant flowing into the radiator WJB from the inlet WJB1IN of the refrigerant passage flows through the refrigerant passages WJB1UH, WJB1UL, WJB1VH, WJB1VL, WJB1WH, and WJB1WL, and flows out to the radiator WJB through the outlet WJB1OUT of the refrigerant passage outside.

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 arm element UL. The refrigerant flowing through the refrigerant flow path WJB1VH mainly cools the V-phase high sidearm element VH. The refrigerant flowing through refrigerant flow path WJB1VL mainly cools V-phase low 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 arm element WL.

As shown in FIG. 10(B) , heat dissipation portion WJB is disposed on the opposite side of U-phase low-side arm element UL across U-phase negative electrode-side conductor NIU in the height direction. In addition, an electrical insulation treatment such as alumite treatment is performed between the heat dissipation portion WJB and the U-phase negative-electrode-side conductor NIU, for example.

Radiator WJB is disposed on the opposite side of U-phase high-side arm element UH across U-phase output-side conductor 51U in the height direction. In addition, an electrical insulation treatment such as alumite treatment is applied between the heat dissipation portion WJB and the U-phase output-side conductor 51U, for example.

Radiator WJB is disposed on the opposite side of V-phase low-side arm element VL across V-phase negative-side conductor NIV in the height direction. In addition, an electrical insulation treatment such as alumite treatment is performed between the heat dissipation portion WJB and the V-phase negative electrode side conductor NIV, for example.

Radiator WJB 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. In addition, an electrical insulation treatment such as alumite treatment is applied between the heat dissipation portion WJB and the V-phase output-side conductor 51V, for example.

Radiator WJB is disposed on the opposite side of W-phase low-side arm element WL with W-phase negative-electrode-side conductor NIW interposed therebetween in the height direction. In addition, an electrical insulation treatment such as alumite treatment is performed between the heat dissipation portion WJB and the W-phase negative electrode side conductor NIW, for example.

Radiator WJB is disposed on the opposite side of W-phase high-side arm element WH across W-phase output-side conductor 51W in the height direction. In addition, an electrical insulation treatment such as alumite treatment or the like is applied between the heat dissipation portion WJB and the W-phase output-side conductor 51W.

In the examples shown in FIGS. 9(A) to 11 , since the heat dissipation portion WJB is provided, the cooling performance can be improved compared to the case where the heat dissipation portion WJB is not provided.

Moreover, in the examples shown in FIGS. Between the phase negative side 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 side conductor NIW, and between the heat dissipation part WJB and the W-phase output side conductor 51W Between them, electrical insulation treatment is implemented, so not only through the heat dissipation part WJA, but also through the heat dissipation part WJB, the necessary electrical insulation can be ensured, and the U-phase high-side arm element UH, U-phase low-side arm element UL, V The 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 are cooled.

＜Application example＞

Hereinafter, an application example of the power conversion device 1 of the present invention will be described with reference to the drawings.

FIG. 12 is a diagram showing an example of a part of a vehicle 10 to which the power conversion device 1 according to the first to third embodiments is applicable.

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.

In the example shown in FIG. 12 , a vehicle 10 includes, in addition to the power conversion device 1 , a battery (battery) 11 (BATT), a first motor 12 (MOT) for driving, and a second motor 13 (GEN) for power generation. .

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 connected to the DC connector 1 a of the power conversion device 1 . The positive terminal PB and the negative terminal NB are connected to positive terminals and negative terminals of a plurality of battery modules connected in series in the battery case.

The first motor 12 generates rotational driving force (power running operation) by electric power supplied from the battery 11 . The second motor 13 generates generated electric power by the rotational driving force input to the rotary 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 (brushless) DC (Direct Current, DC) motor. The three phases are U phase, V phase and 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 each include: a rotor having permanent magnets for excitation; and a stator having three-phase stator windings for generating a rotating magnetic field for rotating the rotors. Three-phase stator windings of the first motor 12 are connected to a first three-phase connector 1 b of the power converter 1 . The three-phase stator windings of the second motor 13 are connected to the second three-phase connector 1 c of the power conversion device 1 .

The power conversion device 1 shown in FIG. 12 includes a power module (power module) 21, a reactor (reactor) 22, a capacitor unit (condenser unit) 23, a resistor 24, a first current sensor 25, a second current sensor 26, a second 3 Current sensor 27, electronic control unit 28 (MOT GEN ECU) and gate drive unit (gate drive unit) 29 (G/DVCU ECU).

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 shown in FIG. 12 , the first power conversion circuit unit 31 includes the first power conversion device 1 of the first embodiment shown in FIGS. 1 to 5 . Output-side conductors 51U, 51V, and 51W of the power conversion device 1 according to the first embodiment shown in FIGS. 1 to 5 are collectively connected to the first three-phase connector 1b. That is, the output-side conductors 51U, 51V, and 51W of the power conversion device 1 of the first embodiment shown in FIGS. It is connected to the three-phase stator winding of the first motor 12 .

The positive 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 are connected together to the positive terminal PB of the battery 11 .

Negative-side conductors NIU, NIV, and NIW of the power conversion device 1 according to the first embodiment shown in FIGS.

That is, the first power conversion circuit unit 31 converts the DC power input from the battery 11 via the third power conversion circuit unit 33 into three-phase AC power.

In the example shown in FIG. 12 , the second power conversion circuit unit 32 includes the second power conversion device 1 of the first embodiment shown in FIGS. 1 to 5 . Output-side conductors 51U, 51V, and 51W of the power conversion device 1 according to the first embodiment shown in FIGS. 1 to 5 are collectively connected to the second three-phase connector 1c. That is, the output side conductors 51U, 51V, and 51W of the second power conversion device 1 of the first embodiment shown in FIGS. It is connected to the three-phase stator winding of the second motor 13 .

The positive side conductors PIU, PIV, and PIW of the power conversion device 1 of the first embodiment shown in FIGS. 1 to 5 constituting the second power conversion circuit unit 32 are collectively connected to the positive terminal PB of the battery 11 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 of the first power conversion circuit unit 31 .

The negative electrode side conductors NIU, NIV, and NIW of the power conversion device 1 of the first embodiment shown in FIGS. The first power conversion circuit unit 31 is the negative-side conductors NIU, NIV, and NIW of the power conversion device 1 according to the first embodiment shown in FIGS. 1 to 5 .

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 .

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 element of the first power conversion circuit unit 31 shown in FIG. The element WH and the W-phase low-side arm element WL correspond to the first U-phase high-side arm element UH, U-phase low-side arm element UL, and V of the power conversion device 1 of the first embodiment shown in FIGS. 1 to 5 . Phase high side arm element VH, V phase low side arm element VL, W phase high side arm element WH, W phase low side arm element WL.

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 element of the second power conversion circuit unit 32 shown in FIG. The element WH and the W-phase low-side arm element WL correspond to the U-phase high-side arm element UH, the U-phase low-side arm element UL, and V of the power conversion device 1 of the first embodiment shown in FIGS. 1 to 5 . Phase high side arm element VH, V phase low side arm element VL, W phase high side arm element WH, 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, the electrode VHA1 (see FIG. 3 ) of the V-phase high-side arm element VH of the first power conversion circuit unit 31 , the W-phase The electrode WHA1 (see FIG. 3 ) of the high 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 part 32, the electrode VHA1 (refer to FIG. 3 ) of the V-phase high side arm element VH ( Referring to FIG. 3 ), the electrode WHA1 (see FIG. 3 ) of the W-phase high side arm element WH is connected to the positive bus PI. The positive bus PI is connected to the positive bus 50 p of the capacitor unit 23 .

In the first power conversion circuit unit 31 , the electrode ULB1 (see FIG. 3 ) of the U-phase low side arm element UL, 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 (Refer to FIG. 3 ), and the electrode ULB1 (refer to FIG. 3 ) of the U-phase low-side arm element UL of the second power conversion circuit part 32, the electrode VLB1 (refer to FIG. 3 ) of the V-phase low-side arm element VL, and the W-phase low-side arm element VLB1 (refer to FIG. 3 ). Electrode WLB1 (see FIG. 3 ) of side arm element WL is connected to negative electrode bus NI. The negative busbar N1 is connected to the negative busbar 50n 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 section 31 in the example shown in FIG. 12 corresponds to the first one shown in FIGS. 1 to 5 . The U-phase output side conductor 51U of the power conversion device 1 according to the embodiment. The connection point TI of the V-phase high-side arm element VH and the V-phase low-side arm element VL of the first power conversion circuit section 31 in the example shown in FIG. 12 corresponds to the first one shown in FIGS. 1 to 5 . The V-phase output side conductor 51V of the power conversion device 1 according to the embodiment. The connection point TI of the W-phase high-side arm element WH and the W-phase low-side arm element WL of the first power conversion circuit section 31 in the example shown in FIG. 12 corresponds to the first one shown in FIGS. 1 to 5 . The W-phase output side conductor 51W of the power conversion device 1 according to the embodiment.

First, 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 according to the first embodiment shown in FIGS. 1 to 5 correspond to those shown in FIG. 12 . The first bus 51 in the example.

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 section 32 in the example shown in FIG. The U-phase output side conductor 51U of the power conversion device 1 according to the embodiment. The connection point TI of the V-phase high-side arm element VH and the V-phase low-side arm element VL of the second power conversion circuit section 32 in the example shown in FIG. 12 corresponds to the second one shown in FIGS. 1 to 5 . The V-phase output side conductor 51V of the power conversion device 1 according to the embodiment. The connection point TI of the W-phase high-side arm element WH and the W-phase low-side arm element WL of the second power conversion circuit section 32 in the example shown in FIG. 12 corresponds to the second one shown in FIGS. 1 to 5 . The W-phase output side conductor 51V of the power conversion device 1 according to the embodiment.

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 according to the first embodiment shown in FIGS. 1 to 5 correspond to those shown in FIG. 12 . The second bus 52 in the example.

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 connected to 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 1 b.

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 connected to 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.

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, and the W-phase The high-side arm element WH and the 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 element WH of the second power conversion circuit unit 32 , The W-phase low-side arm element WL includes a freewheeling diode.

In the example shown in FIG. 12 , the gate drive unit 29 controls 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 element of the first power conversion circuit section 31. Gate signals are input to arm element VL, W-phase high-side arm element WH, and W-phase low-side arm element WL.

Similarly, the gate drive unit 29 controls 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 elements VL and W of the second power conversion circuit section 32. The phase high-side arm element WH and the W-phase low-side arm element WL input gate signals.

The first power conversion circuit unit 31 converts the DC power input from the battery 11 via the third power conversion circuit unit 33 into three-phase AC power, and supplies AC U-phase current to the three-phase stator windings of the first motor 12 . V-phase current and W-phase current. The second power conversion circuit part 32 passes through the U-phase high-side arm element UH, the U-phase low-side arm element UL, and the V-phase high-side arm elements VH and V of the second power conversion circuit part 32 synchronized with the rotation of the second motor 13. The on (conduction)/off (blocking) drive of the phase low arm element VL, the W phase high arm element WH, and the W phase low arm element WL is driven from the three-phase stator windings of the second motor 13. The output three-phase AC power is converted to DC power.

In the example shown in FIG. 12 , the third power conversion circuit unit 33 includes the power conversion device 1 according to the second embodiment.

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 and a low-side arm element S2 of one phase.

The electrode on the positive side of the high side arm element S1 is connected to the positive busbar PV. The positive bus PV is connected to the positive bus 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 busbar NV. The negative bus NV is connected to the negative bus 50 n of the capacitor unit 23 . The negative bus bar 50 n of the capacitor unit 23 is connected to the negative 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 have freewheeling diodes.

A third bus bar 53 constituting a connection point between the high-side arm element S1 and the low-side arm element S2 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 . 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 through a signal line.

The third power conversion circuit section 33 switches the high side arm element S1 and the low side arm element S2 based on the gate signal input from the gate drive unit 29 to the gate of the high side arm element S1 and the gate of the low side arm element S2 On (conduction)/off (blocking).

When boosting the voltage, the third power conversion circuit unit 33 is in the first state where the low-side arm element S2 is turned on (conducting) and the high-side arm element S1 is turned off (blocking), and The low-side arm element S2 is switched alternately between the second state in which the low-side arm element S2 is set to off (blocking) and 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 receives DC excitation to store magnetic energy. In the second state, an electromotive force (induced voltage) is generated between both ends of the reactor 22 so as to prevent a change in magnetic flux caused by blocking the current flowing to 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 applied between the positive busbar PV and the negative busbar NV of the third power conversion circuit part 33 .

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 PV of the third power conversion circuit unit 33 , the high side arm element S1 , the reactor 22 , and the positive terminal PB of the battery 11 , and the reactor 22 receives DC excitation to store magnetic energy. In the first state, an electromotive force (induced voltage) is generated between both ends of the reactor 22 so as to prevent a change in magnetic flux caused by blocking the current flowing to the reactor 22 . The induced voltage due to the magnetic energy accumulated in the reactor 22 is stepped down, and the step-down voltage lower than the voltage between the positive busbar PV and the negative busbar NV of the third power conversion circuit part 33 is applied to the positive terminal PB and the positive terminal PB of the battery 11. between negative terminals NB.

The capacitor unit 23 includes a first smoothing capacitor 41 , a second smoothing capacitor 42 , and a noise filter (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 a voltage fluctuation that occurs during the on/off switching operation of the high side arm element S1 and the low side arm element S2 during regeneration of the third power conversion circuit unit 33 .

The second smoothing capacitor 42 is connected between the positive bus line PI and the negative bus line NI of the first power conversion circuit unit 31 and the second power conversion circuit unit 32 , and between the positive bus line PV and the negative bus line NV of the third power conversion circuit unit 33 . . The second smoothing capacitor 42 is connected to a plurality of positive bus lines PI, negative bus lines NI, positive bus lines PV, and negative bus lines NV via the positive bus lines 50p and the negative bus lines 50n. The second smoothing capacitor 42 corresponds to 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 element accompanying the first power conversion circuit unit 31 and the second power conversion circuit unit 32. Voltage fluctuations caused by ON/OFF switching operations of the side arm 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 during the on/off switching operation of the high-side arm element S1 and the low-side arm element S2 during boosting by the third power conversion circuit section 33 .

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

The resistor 24 is connected between the positive bus PI and the negative bus NI of the first power conversion circuit unit 31 and the second power conversion circuit unit 32 , and between the positive bus PV and the negative bus NV of the third power conversion circuit unit 33 .

The first current sensor 25 is disposed on the first bus bar 51 that constitutes the connection point TI of each phase of the first power conversion circuit unit 31 and detects the current of each of the U phase, the V phase, and the W phase. , and connected to the first input/output terminal Q1. The second current sensor 26 is arranged on the second bus bar 52 constituting the connection point TI of each phase of the second power conversion circuit unit 32 to detect the currents of the U phase, the V phase, and the W phase. , and is connected to the second input/output terminal Q2. The third current sensor 27 is arranged on the third bus bar 53 which constitutes the connection point of the high-side arm element S1 and the low-side arm element S2 and is connected to the reactor 22 to detect the current flowing to 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 through a signal line.

The electronic control unit 28 controls the respective operations of the first motor 12 and the second motor 13 . For example, the electronic control unit 28 is a software (software) function unit that functions when a processor such as a central processing unit (Central Processing Unit, CPU) executes a predetermined program. The software function part is composed of processors such as CPU, read-only memory (Read Only Memory, ROM) for storing programs, random access memory (Random Access Memory, RAM) for temporarily storing data, and electronic circuits such as timers. Electronic Control Unit (ECU). In addition, at least a part of the electronic control unit 28 may also be an integrated circuit such as a large scale integrated circuit (Large Scale Integration, LSI). 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 (torque) command value for the first motor 12, etc., and generates a current input to the gate. The control signal of the drive unit 29. For example, the electronic control unit 28 executes current feedback control using the current detection value of the second current sensor 26 and the current target value corresponding to the regeneration command value for the second motor 13, etc., and generates a control signal input to the gate driving unit 29. . The control signal indicates 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 element of the first power conversion circuit part 31 and the second power conversion circuit part 32. Timing signals for on (conducting)/off (blocking) driving of the element VL, the W-phase high-side arm element WH, and the W-phase low-side arm element WL. For example, the control signal is a pulse width modulated signal or the like.

The gate drive unit 29 generates U-phase high-side arm element UH and U-phase low-side arm element UH for the first power conversion circuit unit 31 and the second power conversion circuit unit 32 based on the control signal received from the electronic control unit 28 . 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 WL actually perform on (conduction)/off (blocking) driving gate signal. For example, the gate driving unit 29 executes amplification, level shifting, and the like of a control signal to generate a gate signal.

The gate drive unit 29 generates a gate signal for on (conducting)/off (blocking) driving each of the high side arm element S1 and the low side arm element S2 of the third power conversion circuit unit 33 . For example, the gate drive unit 29 generates a gate signal having a duty ratio corresponding to a boost voltage command for boosting by the third power conversion circuit unit 33 or a step-down voltage command for regeneration of the third power conversion circuit unit 33 . . The duty cycle is the ratio of the high sidearm element S1 to the low sidearm element S2.

In this example, two power conversion devices 1 of the first embodiment shown in FIGS. 1 to 5 are applied to a vehicle 10 shown in FIG. 12 , and one power conversion device 1 of the second embodiment is applied.

In other examples, 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 first embodiment shown in FIGS. 6(A) to 8 may be applied. 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(A) 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, the power conversion device 1 of the first to third embodiments may be applied to The device 1 is applicable to equipment other than the vehicle 10 such as elevators, pumps, fans, railway vehicles, air conditioners, refrigerators, and washing machines.

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

Claims (5)

1. a kind of power inverter characterized by comprising

Radiating part has the refrigerant flow path to circulate for refrigerant, the 1st mounting surface and the parallel with the 1st mounting surface the 2nd takes Section；And

Element column, along 1st direction parallel with the 1st mounting surface and the 2nd mounting surface be arranged with high side arm member with it is low Side arm member,

The position of the high side arm member on 1st direction and the position of the downside arm element are deviateed,

Carry the 1st mounting surface of the high side arm member, with the 2nd mounting surface for carrying the downside arm element be It is configured with offsetting with one another on the 2nd direction orthogonal with the 1st mounting surface and the 2nd mounting surface.

2. power inverter according to claim 1 characterized by comprising

Side of the positive electrode electric conductor；

Outlet side electric conductor；And

Negative side electric conductor,

In the wherein one side of the high side arm member, it is configured with the 1st electrode,

In the another side of the high side arm member, it is configured with the 2nd electrode,

In the wherein one side of the downside arm element, it is configured with the 1st electrode,

In the another side of the downside arm element, it is configured with the 2nd electrode,

The high side arm member and the downside arm element are disposed on conductive with the outlet side when observing along the 2nd direction The position that weight is closed,

1st electrode of the high side arm member is electrically connected to the side of the positive electrode electric conductor,

2nd electrode of the high side arm member is electrically connected to the wherein one side of the outlet side electric conductor,

1st electrode of the downside arm element is electrically connected to the another side of the outlet side electric conductor,

2nd electrode of the downside arm element is electrically connected to the negative side electric conductor.

3. power inverter according to claim 2, which is characterized in that

The high side arm member and the side of the positive electrode electric conductor are arranged in a wherein surface side for the outlet side electric conductor,

The downside arm element and the negative side electric conductor are arranged in another surface side of the outlet side electric conductor.

4. power inverter according to claim 2 or 3, which is characterized in that

The radiating part is configured at the opposite of the high side arm member across the side of the positive electrode electric conductor on the 2nd direction Side,

Between the radiating part and the side of the positive electrode electric conductor, it is implemented with electrical insulation treatment,

The radiating part is configured at the opposite of the downside arm element across the outlet side electric conductor on the 2nd direction Side,

Between the radiating part and the outlet side electric conductor, it is implemented with electrical insulation treatment.

5. power inverter according to claim 2 or 3 characterized by comprising

Another radiating part,

Another radiating part is configured at the downside arm element across the negative side electric conductor on the 2nd direction Opposite side,

Between another radiating part and the negative side electric conductor, it is implemented with electrical insulation treatment,

Another radiating part is configured at the high side arm member across the outlet side electric conductor on the 2nd direction Opposite side,

Between another radiating part and the outlet side electric conductor, it is implemented with electrical insulation treatment.