Power Conversion Device

Abstract

To obtain an electric power conversion system which achieves low costs.SOLUTION: An electric power conversion system includes: an electric power conversion circuit; an electric power conversion part having a first connection part and a second connection part; a first wiring part connected to the first connection part; a second wiring part connected to the second connection part; a first supply part connected to the first wiring part; a second supply part connected to the second wiring part; and a housing which houses the electric power conversion part, the first wiring part, and the second wiring part and has four peripheral walls having a rectangular cylindrical shape. The first connection part is provided at a first peripheral wall side end in the electric power conversion part. The second connection part is provided at a second peripheral wall side end in the electric power conversion part. The first supply part is disposed adjacent to a first peripheral wall side end in a third peripheral wall or a fourth peripheral wall. The second supply part is disposed adjacent to a second peripheral wall side end in the third peripheral wall or the fourth peripheral wall. The first wiring part extends along the first peripheral wall between the first connection part and the first supply part, and the second wiring part extends along the second peripheral wall between the second connection part and the second supply part.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present application relates to a power conversion device. [Background technology]

[0002] Due to recent environmental regulations and technological advances surrounding automobiles, electric vehicles and hybrid vehicles of various vehicle classes have been developed and are becoming increasingly popular. Electrically driven vehicles that use a motor as a drive source, such as hybrid vehicles and electric vehicles, are equipped with multiple power conversion devices. A power conversion device converts input current from direct current to alternating current, from alternating current to direct current, or converts input voltage to a different voltage. Specific examples of power conversion devices equipped in electric vehicles include a charger that converts commercial alternating current power to direct current power to charge a high-voltage battery, a DC-DC converter that converts the DC power of the high-voltage battery to DC power of a different voltage, and an inverter that converts the DC power from the high-voltage battery to AC power for the motor.

[0003] A power conversion device is composed of a power conversion unit made up of a power conversion circuit that performs power conversion and a control circuit that controls the operation of the power conversion circuit, a housing that houses them, and an interface (e.g., a connector) that is connected to an external device and supplies power from the external device to the power conversion unit or from the power conversion unit to the external device. In electric vehicles, there is a demand for smaller and less expensive power conversion devices in order to ensure space in the vehicle interior and to meet demands for lower prices.

[0004] A configuration of a miniaturized DC-DC converter device, which is a power conversion device, has been disclosed (see, for example, Patent Document 1). In the configuration disclosed in Patent Document 1, the power conversion device is composed of a noise filter circuit unit, a power module having a switching element, a transformer, a reactor, a capacitor, and input / output terminals electrically connected to the power module. By electrically connecting the input / output terminals to an interface, power is supplied from an external device to the power module or from the power module to the external device. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 4418208 Summary of the Invention [Problem to be solved by the invention]

[0006] In Patent Document 1, the switching elements are integrated into the power module, which allows the power conversion device to be miniaturized. However, since the layout of various devices in an electric vehicle often differs depending on the vehicle model, the interface (e.g., connector) that connects the power conversion device to the electric vehicle and the location of the refrigerant inlet and outlet vary depending on the vehicle model. In Patent Document 1, the input / output sections of each component are fixed, so if the location of the interface changes, it is not possible to address this by simply changing the component layout. Instead, it is necessary to change the specifications of expensive large components such as the power module, transformer, and choke coil for each electric vehicle model. This poses a problem of increased costs for each component, and ultimately the cost of the power conversion device.

[0007] In the configuration of Patent Document 1, if the position of the interface is changed, it is possible to accommodate this change without changing the specifications of large, expensive components by using wiring members that connect the input / output unit and the interface. However, this increases the size of the wiring members, which raises the issue of increased costs for the wiring members. Furthermore, as the size of the wiring members increases, the amount of heat generated by the wiring members increases, which requires additional cooling members, which raises the issue of increased costs for the power conversion device.

[0008] Therefore, an object of the present invention is to obtain a power conversion device that is low in cost without changing the specifications of expensive large components. [Means for solving the problem]

[0009] The power conversion device disclosed in the present application includes: a power conversion circuit that converts electric power; a power conversion unit having a first connection portion and a second connection portion that electrically connect the power conversion circuit to an external device; a first wiring portion electrically connected to the first connection portion; a second wiring portion electrically connected to the second connection portion; a first supply portion electrically connected to the first wiring portion; a second supply portion electrically connected to the second wiring portion; and a housing that houses the power conversion unit, the first wiring portion, and the second wiring portion and has four rectangular cylindrical peripheral walls, the four peripheral walls being a first peripheral wall, a second peripheral wall opposite the first peripheral wall, and a third peripheral wall. a third peripheral wall and a fourth peripheral wall opposite the third peripheral wall, the first connection portion being provided at the end of the power conversion portion on the first peripheral wall side, the second connection portion being provided at the end of the power conversion portion on the second peripheral wall side, the first supply portion being arranged adjacent to the end of the third peripheral wall or the fourth peripheral wall on the first peripheral wall side, the second supply portion being arranged adjacent to the end of the third peripheral wall or the fourth peripheral wall on the second peripheral wall side, the first wiring portion extending along the first peripheral wall between the first connection portion and the first supply portion, and the second wiring portion extending along the second peripheral wall between the second connection portion and the second supply portion. [Effects of the Invention]

[0010] According to the power conversion device disclosed herein, the first connection portion is provided at the end of the power conversion unit on the first circumferential wall side, the second connection portion is provided at the end of the power conversion unit on the second circumferential wall side, the first supply portion is arranged adjacent to the end of the third or fourth circumferential wall on the first circumferential wall side, the second supply portion is arranged adjacent to the end of the third or fourth circumferential wall on the second circumferential wall side, the first wiring portion extends along the first circumferential wall between the first connection portion and the first supply portion, and the second wiring portion extends along the second circumferential wall between the second connection portion and the second supply portion. Therefore, even if the first supply portion and the second supply portion are arranged adjacent to either the end of the third or fourth circumferential wall, it is possible to suppress an increase in size of the first wiring portion and the second wiring portion without changing the specifications of the power conversion unit, which is a large and expensive component, and thus it is possible to reduce the cost of the first wiring portion and the second wiring portion. Since the costs of the first wiring portion and the second wiring portion are reduced and the specifications of the power conversion unit are not changed, a low-cost power conversion device can be obtained. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a plan view showing an outline of a power conversion device according to a first embodiment. [Figure 2] 2 is a cross-sectional view showing an outline of the power converter taken along the line AA in FIG. 1. FIG. [Figure 3] 2 is a cross-sectional view showing an outline of the power converter taken along the line BB in FIG. 1. [Figure 4] FIG. 4 is a plan view showing an outline of another power conversion device according to the first embodiment. [Figure 5] FIG. 4 is a plan view showing an outline of another power conversion device according to the first embodiment. [Figure 6] FIG. 4 is a plan view showing an outline of another power conversion device according to the first embodiment. [Figure 7] FIG. 10 is a plan view showing an outline of a power conversion device according to a second embodiment. [Figure 8] 8 is a cross-sectional view showing an outline of the power converter taken along the CC cross section in FIG. 7. [Figure 9] FIG. 10 is a plan view showing an outline of a power conversion device according to a third embodiment. [Figure 10] FIG. 10 is a perspective view showing an outline of a housing of a power converter according to a fourth embodiment. [Figure 11] FIG. 10 is a plan view showing an outline of a power conversion device according to a fifth embodiment. [Figure 12] FIG. 13 is a plan view showing an outline of a power conversion device according to a sixth embodiment. [Figure 13] 13 is a cross-sectional view of the power converter taken along the line DD in FIG. 12. FIG. [Figure 14] FIG. 13 is a plan view showing an outline of another power conversion device according to the sixth embodiment. [Figure 15] FIG. 13 is a plan view showing an outline of another power conversion device according to the sixth embodiment. [Figure 16] FIG. 13 is a plan view showing an outline of another power conversion device according to the sixth embodiment. [Figure 17] FIG. 13 is a plan view showing an outline of another power conversion device according to the sixth embodiment. [Figure 18] FIG. 13 is a plan view showing an outline of another power conversion device according to the sixth embodiment. [Figure 19] FIG. 13 is a plan view showing an outline of another power conversion device according to the sixth embodiment. [Figure 20] FIG. 13 is a plan view showing an outline of another power conversion device according to the sixth embodiment. [Figure 21] FIG. 13 is a plan view showing an outline of a power conversion device according to a seventh embodiment. [Figure 22] 22 is a cross-sectional view of the power converter taken along the EE cross section of FIG. 21. [Figure 23] FIG. 10 is a plan view showing an outline of a power conversion device of a comparative example. [Figure 24] FIG. 10 is a plan view showing an outline of a power conversion device of another comparative example. [Figure 25] FIG. 10 is a plan view showing an outline of a power conversion device of another comparative example. [Figure 26] 1 is a diagram illustrating an example of an installation state of a power conversion device disclosed in the present application. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, a power conversion device according to an embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or equivalent members and parts are denoted by the same reference numerals.

[0013] Embodiment 1 Fig. 1 is a plan view showing an outline of a power conversion device 1 according to a first embodiment, Fig. 2 is a cross-sectional view showing an outline of the power conversion device 1 taken along the AA cross section of Fig. 1, Fig. 3 is a cross-sectional view showing an outline of the power conversion device 1 taken along the BB cross section of Fig. 1, and Figs. 4 to 6 are plan views showing an outline of another power conversion device 1 according to the first embodiment. The power conversion device 1 is a device that converts an input current from DC to AC, or from AC to DC, or converts an input voltage into a different voltage. In this embodiment, the power conversion device 1 will be described as a DC-DC converter that converts an input voltage into a different voltage, but the power conversion device 1 is not limited to a DC-DC converter.

[0014] <Power conversion device 1> As shown in FIG. 1 , the power conversion device 1 includes a power conversion unit 3, a first wiring unit 6, a second wiring unit 7, a first supply unit 4, a second supply unit 5, and a housing 2. The power conversion unit 3 includes a power conversion circuit 3a that converts power, and a first connection unit 3b and a second connection unit 3c that electrically connect the power conversion circuit 3a to an external device. The first connection unit 3b and the second connection unit 3c are provided in the area surrounded by a dashed line. The first wiring unit 6 is electrically connected to the first connection unit 3b. The second wiring unit 7 is electrically connected to the second connection unit 3c. The first supply unit 4 is electrically connected to the first wiring unit 6. The second supply unit 5 is electrically connected to the second wiring unit 7. The housing 2 houses the power conversion unit 3, the first wiring unit 6, and the second wiring unit 7 and has four peripheral walls in a rectangular cylindrical shape. In this embodiment, the first supply unit 4 is connected to an external device and supplies power from the external device to the power conversion unit 3 via the first wiring unit 6. The second supply unit 5 is connected to an external device and supplies power from the power conversion unit 3 to the external device via the second wiring unit 7 .

[0015] The components of the power converter 1 will now be described. The housing 2 is made of a metal material with excellent thermal conductivity. The metal material is, for example, aluminum. The four rectangular cylindrical walls of the housing 2 are a first peripheral wall 2b, a second peripheral wall 2c facing the first peripheral wall 2b, a third peripheral wall 2d, and a fourth peripheral wall 2e facing the third peripheral wall 2d. The rectangular cylindrical shape refers to a cylindrical shape with a rectangular cross section. In this embodiment, the housing 2 has a cover wall 2a that covers the openings of the four peripheral walls. The surface of the cover wall 2a surrounded by the four peripheral walls is a cooling surface 2a1. As shown in FIG. 2 , the power conversion unit 3 is fixed to the cooling surface 2a1 of the housing 2 and thermally connected to the housing 2. Because the power conversion unit 3 is thermally connected to the cooling surface 2a1 of the housing 2, the power conversion unit 3 can be efficiently cooled. In this embodiment, the housing 2 has a refrigerant flow path 2f, which will be described later, which can further efficiently cool the power conversion unit 3.

[0016] The housing 2 has a refrigerant flow path 2f through which a refrigerant flows to cool the power conversion unit 3, an inlet pipe 2g through which the refrigerant flows into the refrigerant flow path 2f, and an outlet pipe 2h through which the refrigerant flows out of the refrigerant flow path 2f. In this embodiment, the refrigerant flow path 2f is formed inside the cover wall 2a. As shown in FIG. 1, the inlet pipe 2g and the outlet pipe 2h are provided so as to protrude outward from the side surface of the outer wall of the housing 2. As shown in FIG. 3, the inlet pipe 2g is fitted into an inlet pipe through-hole 2a2 provided in the side surface of the cover wall 2a and corresponding to the shape of the inlet pipe 2g. When the inlet pipe 2g is cylindrical, the inlet pipe through-hole 2a2 is circular. As shown in FIG. 2, the outlet pipe 2h is fitted into an outlet pipe through-hole 2a3 provided in the side surface of the cover wall 2a and corresponding to the shape of the outflow pipe 2h. When the outflow pipe 2h is cylindrical, the outlet pipe through-hole 2a3 is circular.

[0017] At least one of the inlet pipe 2g and the outlet pipe 2h is arranged on the third circumferential wall 2d side or the fourth circumferential wall 2e side. In this embodiment, the inlet pipe 2g is arranged on the third circumferential wall 2d side, and the outlet pipe 2h is arranged on the fourth circumferential wall 2e side. However, the arrangement of the inlet pipe 2g and the outlet pipe 2h is not limited to this. For example, the inlet pipe 2g may be arranged on the fourth circumferential wall 2e side, and the outlet pipe 2h may be arranged on the third circumferential wall 2d side, or both the inlet pipe 2g and the outlet pipe 2h may be arranged on the third circumferential wall 2d side or the fourth circumferential wall 2e side. Furthermore, one or both of the inlet pipe 2g and the outlet pipe 2h may be arranged on the surface of the cover wall 2a opposite to the cooling surface 2a1.

[0018] The power conversion unit 3 is a DC-DC converter that converts DC power from a high-voltage battery into DC power of a different voltage. The power conversion unit 3 is composed of switching elements, a transformer, a smoothing reactor, a capacitor, etc. The arrangement and shape of each component that makes up the power conversion unit 3 are not shown in the figure. The first connection portion 3b and the second connection portion 3c are, for example, screw holes provided in the extended portion of a component of the power conversion circuit 3a. The extended portion is not shown in the figure.

[0019] The first supply unit 4 and the second supply unit 5 are formed, for example, by connectors. The connectors are general-purpose connectors. The connectors are fixed to the cover wall 2a or the four peripheral walls. A threaded hole 4a is formed in the portion of the first supply unit 4 that connects to the first wiring unit 6, as shown in FIG. 2, and the first wiring unit 6 and the first supply unit 4 are connected with a screw 9. A threaded hole 5a is formed in the portion of the second supply unit 5 that connects to the second wiring unit 7, as shown in FIG. 3, and the second wiring unit 7 and the second supply unit 5 are connected with a screw 11. The configuration of the power conversion device 1 disclosed in the present application, which will be described later, does not require changing the specifications of expensive large components, so a wide variety of low-cost general-purpose connectors can be used. The use of low-cost general-purpose connectors allows for cost reduction of the power conversion device 1. Furthermore, because the connectors are general-purpose connectors, they can be easily attached to the housing 2, improving the productivity of the power conversion device 1.

[0020] The housing 2 has a through-hole 2j in one or more of the cover wall 2a, the first peripheral wall 2b, the second peripheral wall 2c, the third peripheral wall 2d, and the fourth peripheral wall 2e, and the connector passes through the through-hole 2j and is fixed to the wall through which it passes. In this embodiment, the first supply unit 4 passes through the through-hole 2j provided in the third peripheral wall 2d. With the screw hole 4a positioned inside the housing 2, the first supply unit 4 is fixed by a fastener (not shown) on the third peripheral wall 2d near the first peripheral wall 2b. The second supply unit 5 passes through the through-hole 2j provided in the fourth peripheral wall 2e. With the screw hole 5a positioned inside the housing 2, the second supply unit 5 is fixed by a fastener (not shown) on the fourth peripheral wall 2e near the second peripheral wall 2c.

[0021] In this embodiment, the second supply unit 5 is arranged on the fourth peripheral wall 2e opposite the third peripheral wall 2d on which the first supply unit 4 is provided, and the first supply unit 4 is arranged on the third peripheral wall 2d opposite the fourth peripheral wall 2e on which the second supply unit 5 is provided, but this is not limited to this. As shown in Figures 4 and 5, the first supply unit 4 and the second supply unit 5 may be arranged on the same peripheral wall. When the first supply unit 4 and the second supply unit 5 are arranged on the same peripheral wall, both the inlet pipe 2g and the outlet pipe 2h may be arranged on the side of the peripheral wall opposite the side on which the first supply unit 4 and the second supply unit 5 are provided.

[0022] The first wiring portion 6 and the second wiring portion 7 are sheet metal components made of a metal material with excellent conductivity. The metal material is, for example, copper. Through holes are provided at both ends of the first wiring portion 6 and the second wiring portion 7. As shown in FIG. 2 , the first wiring portion 6 is connected to the first connection portion 3b by fastening a screw 8 into a first connection portion 3b, which is a threaded hole, through one of the through holes of the first wiring portion 6. The first wiring portion 6 is connected to the first supply portion 4 by fastening a screw 9 into a threaded hole 4a through the other through hole of the first wiring portion 6. The first connection portion 3b and the first supply portion 4 are electrically connected via the first wiring portion 6. As shown in FIG. 3 , the second wiring portion 7 is connected to the second connection portion 3c by fastening a screw 10 into a second connection portion 3c, which is a threaded hole, through one of the through holes of the second wiring portion 7. The second wiring portion 7 is connected to the second supply portion 5 by fastening a screw 11 into a threaded hole 5a through the other through hole of the second wiring portion 7. The second connection portion 3c and the second supply portion 5 are electrically connected via the second wiring portion .

[0023] In this embodiment, the plate-like first wiring portion 6 and second wiring portion 7 having through holes are fixed to each portion with screws 8 to 11 and electrically connected to each portion, but this is not limited thereto. The first connecting portion 3b, the second connecting portion 3c, the first supply portion 4, the second supply portion 5, the first wiring portion 6, and the second wiring portion 7 may have various configurations and connection methods, and there are many combinations. For example, threaded holes may be provided at the ends of the first wiring portion 6 and the second wiring portion 7. When threaded holes are provided at the ends of the first wiring portion 6 and the second wiring portion 7, through holes may be provided instead of threaded holes on the side connected to the ends of the first wiring portion 6 and the second wiring portion 7, and both are fastened together with screws. Furthermore, the first wiring portion 6 and the second wiring portion 7 may be configured as a harness.

[0024] The first connecting portion 3b, the second connecting portion 3c, the first supply portion 4, and the second supply portion 5 may each be configured as a cylindrical part having a threaded tip and covered with resin. The first wiring portion 6 and the second wiring portion 7 may be connected to each other by welding instead of by screws. The first connecting portion 3b and the second connecting portion 3c may each be configured as a through-hole provided in a substrate, with the tip portions of the first wiring portion 6 and the second wiring portion 7 inserted into the through-hole and then fixed to the through-hole by soldering. Different connection methods may be used for each connection point. For example, the first connecting portion 3b and one end of the first wiring portion 6 may be connected by soldering, and the other end of the first wiring portion 6 and the first supply portion 4 may be connected by screws.

[0025] One or both of the first wiring portion 6 and the second wiring portion 7 have a shape that allows them to be mounted with their extending direction toward the third peripheral wall 2d or the fourth peripheral wall 2e reversed. In this embodiment, as shown by the two-dot chain line in FIG. 1 , both the first wiring portion 6 and the second wiring portion 7 have a shape that allows them to be mounted with their extending direction toward the third peripheral wall 2d or the fourth peripheral wall 2e reversed. Depending on the vehicle model, as shown in FIG. 4 , the first supply portion 4 may be provided on the fourth peripheral wall 2e side. Also, as shown in FIG. 5 , the second supply portion 5 may be provided on the third peripheral wall 2d side. Even if the first supply portion 4 or the second supply portion 5 is moved to the opposing peripheral wall side in this way, as long as the first wiring portion 6 and the second wiring portion 7 have a shape that allows them to be mounted with their extending direction reversed, the first wiring portion 6 and the second wiring portion 7 can be standardized across a variety of vehicle models without changing their shapes or replacing the first wiring portion 6 and the second wiring portion 7 with different wiring members. Since the first wiring portion 6 and the second wiring portion 7 are commonalized, it is possible to easily increase the number of parts produced and reduce the parts cost. Since the parts cost is reduced, the cost of the power conversion device 1 can be reduced.

[0026] <Comparative Example> Prior to describing the main components of the present application, a comparative example will be described. FIG. 23 is a plan view showing an outline of a power conversion device 100 of a comparative example, FIG. 24 is a plan view showing an outline of a power conversion device 100 of another comparative example, and FIG. 25 is a plan view showing an outline of a power conversion device 100 of another comparative example. The power conversion device 100 of the comparative example is a DC-DC converter. Each figure is a schematic diagram of the layout of a DC-DC converter. The power conversion device 100 includes a cooling block 101, an input filter 102, a power module 103, a transformer 104, a choke coil 105, a smoothing capacitor 106, an input terminal 108, an output terminal 109, and interfaces 110 and 111. An inter-component connection unit 107 is a portion that connects the respective components. The cooling block 101 houses the input filter 102, the power module 103, the transformer 104, the choke coil 105, the smoothing capacitor 106, the input terminal 108, and the output terminal 109. The input terminal 108 and the interface 110 are connected by a wiring member 112. The output terminal 109 and the interface 111 are connected by a wiring member 113.

[0027] When the positions of the interfaces 110 and 111 are changed, the shapes of the wiring members 112 and 113 connecting the input terminal 108 and the output terminal 109 to the interfaces 110 and 111 are changed, and by using the wiring members 112 and 113 with changed shapes, it is possible to accommodate this without changing the specifications of expensive, large components (such as the power module 103, the transformer 104, and the choke coil 105). In FIG. 24, the layout of the interface 111 is different from that in FIG. 23, and in FIG. 25, the layout of the interfaces 110 and 111 is different from that in FIG. 23. Although it is possible to accommodate this without changing the specifications of expensive, large components, the wiring member 113 in FIG. 24 becomes larger, and the wiring members 112 and 113 in FIG. 25 become larger.

[0028] The increase in size of the wiring members 112, 113 results in an increase in the cost of the wiring members 112, 113. Furthermore, the increase in size of the wiring members 112, 113 increases the amount of heat generated by the wiring members 112, 113, which requires additional cooling members, thereby increasing the cost of the power conversion device 100. Furthermore, the larger the wiring members 112, 113, the more structures (e.g., screw fastening) are required to ensure the vibration resistance of the wiring members 112, 113. This increases the cost of the power conversion device 100 and the size of the power conversion device 100. Furthermore, to ensure insulation between the wiring members 112, 113 and each component, or between the wiring members 112, 113 and the cooling block 101, it is necessary to provide space around the wiring members 112, 113. Therefore, the larger the wiring members 112, 113, the larger the size of the power conversion device 100.

[0029] <Wiring Configuration of Power Conversion Device 1> The wiring configuration of the power converter 1 of the present application will be described, which allows a cost-reduced power converter 1 to be obtained without changing the specifications of expensive large components. As shown in FIG. 1 , the first connection portion 3b is provided at the end of the power converter 3 on the first circumferential wall 2b side, and the second connection portion 3c is provided at the end of the power converter 3 on the second circumferential wall 2c side. The first supply portion 4 is disposed adjacent to the end of the third circumferential wall 2d or the fourth circumferential wall 2e on the first circumferential wall 2b side, and the second supply portion 5 is disposed adjacent to the end of the third circumferential wall 2d or the fourth circumferential wall 2e on the second circumferential wall 2c side. The first wiring portion 6 extends along the first circumferential wall 2b between the first connection portion 3b and the first supply portion 4, and the second wiring portion 7 extends along the second circumferential wall 2c between the second connection portion 3c and the second supply portion 5.

[0030] In the embodiment shown in Fig. 1, the first supply unit 4 is arranged on the third circumferential wall 2d adjacent to the end of the third circumferential wall 2d on the first circumferential wall 2b side, and the second supply unit 5 is arranged on the fourth circumferential wall 2e adjacent to the end of the fourth circumferential wall 2e on the second circumferential wall 2c side. In the embodiment shown in Fig. 4, the first supply unit 4 is arranged on the fourth circumferential wall 2e adjacent to the end of the fourth circumferential wall 2e on the first circumferential wall 2b side, and the second supply unit 5 is arranged on the fourth circumferential wall 2e adjacent to the end of the fourth circumferential wall 2e on the second circumferential wall 2c side. In the embodiment shown in Fig. 5, the first supply unit 4 is arranged on the third circumferential wall 2d adjacent to the end of the third circumferential wall 2d on the first circumferential wall 2b side, and the second supply unit 5 is arranged on the third circumferential wall 2d adjacent to the end of the third circumferential wall 2d on the second circumferential wall 2c side.

[0031] In this manner, the first connection portion 3b is provided at the end of the power conversion unit 3 on the first circumferential wall 2b side, the first supply portion 4 is disposed adjacent to the end of the third circumferential wall 2d or the fourth circumferential wall 2e on the first circumferential wall 2b side, and the first wiring portion 6 extends along the first circumferential wall 2b between the first connection portion 3b and the first supply portion 4. Therefore, regardless of whether the first supply portion 4 is disposed on the third circumferential wall 2d or the fourth circumferential wall 2e, the increase in size of the first wiring portion 6 can be suppressed without changing the specifications of the power conversion unit 3, which is an expensive, large component. Because the increase in size of the first wiring portion 6 is suppressed, the cost of the first wiring portion 6 can be reduced. Because the cost of the first wiring portion 6 is reduced and the specifications of the power conversion unit 3 are not changed, a low-cost power conversion device 1 can be obtained. Furthermore, because the specifications of the power conversion unit 3, which is an expensive, large component, are not changed, the production volume of expensive, large components can be increased.

[0032] Similarly, the second connection portion 3c is provided at the end of the power conversion unit 3 on the second circumferential wall 2c side, the second supply portion 5 is disposed adjacent to the end of the third circumferential wall 2d or the fourth circumferential wall 2e on the second circumferential wall 2c side, and the second wiring portion 7 extends along the second circumferential wall 2c between the second connection portion 3c and the second supply portion 5. Therefore, regardless of whether the second supply portion 5 is disposed on the third circumferential wall 2d or the fourth circumferential wall 2e, the size of the second wiring portion 7 can be suppressed without changing the specifications of the power conversion unit 3, which is an expensive, large component. Since the size of the second wiring portion 7 is suppressed, the cost of the second wiring portion 7 can be reduced. Since the cost of the second wiring portion 7 is reduced and the specifications of the power conversion unit 3 are not changed, a low-cost power conversion device 1 can be obtained. Furthermore, since the specifications of the power conversion unit 3, which is an expensive, large component, are not changed, the number of expensive, large components produced can be increased.

[0033] Compared to the arrangement of the input terminal 108 and the output terminal 109 shown in the comparative example of FIG. 24 or 25, the first connection portion 3b and the second connection portion 3c can be arranged closer to the first supply portion 4 and the second supply portion 5, respectively, which allows the first wiring portion 6 and the second wiring portion 7 to be made smaller. Since the first wiring portion 6 and the second wiring portion 7 are made smaller, the costs of the first wiring portion 6 and the second wiring portion 7 can be reduced. Furthermore, it is possible to easily accommodate changes in the arrangement of the first supply portion 4 or the second supply portion 5 without changing the specifications of the power conversion portion 3, which is an expensive large component.

[0034] One or both of the first connecting portion 3b and the second connecting portion 3c are disposed at a central position between the third peripheral wall 2d and the fourth peripheral wall 2e. In the present embodiment, as shown in FIG. 1, both the first connecting portion 3b and the second connecting portion 3c are disposed at a central position between the third peripheral wall 2d and the fourth peripheral wall 2e. With this configuration, even if the first supply unit 4 or the second supply unit 5 is moved to the opposing peripheral wall side as shown in FIG. 4 or FIG. 5, the first wiring unit 6 and the second wiring unit 7 can be accommodated without increasing in size, thereby reducing the costs of the first wiring unit 6 and the second wiring unit 7. Since the costs of the first wiring unit 6 and the second wiring unit 7 are reduced, the cost of the power conversion device 1 can be reduced.

[0035] In the present embodiment, one or both of the first connecting portion 3b and the second connecting portion 3c are arranged in a central position between the third circumferential wall 2d and the fourth circumferential wall 2e. However, the arrangement of the first connecting portion 3b and the second connecting portion 3c is not limited to this. One or both of the first connecting portion 3b and the second connecting portion 3c may be arranged on the side of the third circumferential wall 2d between the third circumferential wall 2d and the fourth circumferential wall 2e or on the side of the fourth circumferential wall 2e. In FIG. 6 , the first connecting portion 3b is arranged on the side of the third circumferential wall 2d between the third circumferential wall 2d and the fourth circumferential wall 2e, and the second connecting portion 3c is arranged on the side of the fourth circumferential wall 2e between the third circumferential wall 2d and the fourth circumferential wall 2e. Even with this arrangement, the first connecting portion 3b is provided at the end of the power conversion unit 3 on the side of the first circumferential wall 2b, and the second connecting portion 3c is provided at the end of the power conversion unit 3 on the side of the second circumferential wall 2c, thereby preventing the first wiring unit 6 and the second wiring unit 7 from becoming larger. In Figure 6, if the first supply unit 4 or the second supply unit 5 is positioned on the opposite peripheral wall due to a change in vehicle model, etc., the shapes of the first wiring unit 6 and the second wiring unit 7 can be changed to the shape shown by the two-dot chain line in Figure 6.

[0036] 1 , the first wiring section 6 and the second wiring section 7 are arranged side by side in the planar direction so as not to overlap with each other in the height direction relative to the power conversion section 3. The arrangement of the first wiring section 6 and the second wiring section 7 is not limited to this, and the first wiring section 6 and the second wiring section 7 may be arranged so as to be stacked in the height direction relative to the power conversion section 3.

[0037] In this embodiment, at least one of the inlet pipe 2g and the outlet pipe 2h is arranged on the side of the third peripheral wall 2d or the side of the fourth peripheral wall 2e. As described above, since there is a high degree of freedom in the arrangement of the first supply unit 4 and the second supply unit 5, the inlet pipe 2g and the outlet pipe 2h are arranged on the side of the peripheral wall on which the first supply unit 4 or the second supply unit 5 is arranged. Even if it becomes necessary to change the arrangement of the inlet pipe 2g or the outlet pipe 2h for each vehicle model, expensive large parts can be standardized across various vehicle models without changing the shape of the power conversion unit 3. Because expensive large parts are standardized, the number of parts produced can be increased, and part costs can be reduced. Because part costs are reduced, the cost of the power conversion device 1 can be reduced.

[0038] As described above, in the power conversion device 1 according to the first embodiment, the first connection portion 3b is provided at the end of the power conversion unit 3 on the side of the first circumferential wall 2b, the second connection portion 3c is provided at the end of the power conversion unit 3 on the side of the second circumferential wall 2c, the first supply portion 4 is arranged adjacent to the end of the third circumferential wall 2d or the fourth circumferential wall 2e on the side of the first circumferential wall 2b, the second supply portion 5 is arranged adjacent to the end of the third circumferential wall 2d or the fourth circumferential wall 2e on the side of the second circumferential wall 2c, the first wiring portion 6 extends along the first circumferential wall 2b between the first connection portion 3b and the first supply portion 4, and the second wiring portion 7 extends along the second circumferential wall 2c between the second connection portion 3c and the second supply portion 5. Therefore, regardless of whether the first supply portion 4 and the second supply portion 5 are arranged adjacent to the end of the third circumferential wall 2d or the fourth circumferential wall 2e, it is possible to prevent the first wiring portion 6 and the second wiring portion 7 from increasing in size without changing the specifications of the power conversion unit 3, which is an expensive, large component. Since the first wiring section 6 and the second wiring section 7 are prevented from becoming larger, it is possible to reduce the costs of the first wiring section 6 and the second wiring section 7. Since the costs of the first wiring section 6 and the second wiring section 7 are reduced and there is no need to change the specifications of the power conversion section 3, it is possible to obtain a low-cost power conversion device 1.

[0039] When one or both of the first connection portion 3b and the second connection portion 3c are disposed in a central position between the third peripheral wall 2d and the fourth peripheral wall 2e, even if the first supply portion 4 or the second supply portion 5 is moved to the opposing peripheral wall side, this can be accommodated without increasing the size of the first wiring portion 6 and the second wiring portion 7, thereby reducing the costs of the first wiring portion 6 and the second wiring portion 7. Because the costs of the first wiring portion 6 and the second wiring portion 7 are reduced, the cost of the power conversion device 1 can be reduced.

[0040] If one or both of the first wiring portion 6 and the second wiring portion 7 have a shape that allows them to be attached by reversing the direction of extension toward the third peripheral wall 2d or the fourth peripheral wall 2e, moving the first supply portion 4 or the second supply portion 5 to the opposing peripheral wall side does not change the shape of the first wiring portion 6 and the second wiring portion 7, and the first wiring portion 6 and the second wiring portion 7 do not need to be replaced with different wiring portions, making it possible to standardize the first wiring portion 6 and the second wiring portion 7 across a variety of vehicle models. Because the first wiring portion 6 and the second wiring portion 7 are standardized, the number of parts produced can be easily increased, and parts costs can be reduced. Because parts costs are reduced, the cost of the power conversion device 1 can be reduced.

[0041] When the first supply unit 4 and the second supply unit 5 are formed by connectors and the connectors are fixed to the cover wall 2a or the four peripheral walls, low-cost general-purpose connectors can be used, thereby reducing the cost of the power conversion device 1. Furthermore, because the connectors are general-purpose connectors, they can be easily attached to the housing 2, thereby improving the productivity of the power conversion device 1.

[0042] When at least one of the inlet pipe 2g and the outlet pipe 2h is disposed on the third circumferential wall 2d side or the fourth circumferential wall 2e side, even if it becomes necessary to change the arrangement of the inlet pipe 2g or the outlet pipe 2h for each vehicle model, it is possible to standardize expensive large parts among various vehicle models without changing the shape of the power conversion unit 3, thereby reducing parts costs. Because parts costs are reduced, the cost of the power conversion device 1 can be reduced.

[0043] Embodiment 2 A power conversion device 1 according to embodiment 2 will now be described. Fig. 7 is a plan view showing an outline of the power conversion device 1 according to embodiment 2, and Fig. 8 is a cross-sectional view showing an outline of the power conversion device 1 taken along the CC cross section in Fig. 7. The power conversion device 1 according to embodiment 2 is configured such that the first supply unit 4 is disposed in the cover wall 2a adjacent to the end of the third peripheral wall 2d on the side of the first peripheral wall 2b.

[0044] In the power converter 1 disclosed herein, the first supply unit 4 is disposed adjacent to an end of the third circumferential wall 2d or the fourth circumferential wall 2e on the first circumferential wall 2b side, and the second supply unit 5 is disposed adjacent to an end of the third circumferential wall 2d or the fourth circumferential wall 2e on the second circumferential wall 2c side. In this embodiment, the first supply unit 4 is disposed on the cover wall 2a adjacent to the end of the third circumferential wall 2d on the first circumferential wall 2b side, as shown in FIG. 8, and the second supply unit 5 is disposed on the fourth circumferential wall 2e adjacent to the end of the fourth circumferential wall 2e on the second circumferential wall 2c side, as shown in FIG. 7. The arrangement of the second supply unit 5 is the same as the arrangement in FIG. 1 shown in the first embodiment. The first supply unit 4 and the second supply unit 5 are, for example, connectors.

[0045] The housing 2 has a through-hole 2k penetrating the cover wall 2a at a location on the cover wall 2a where the first supply unit 4 is to be disposed. The through-hole 2k is formed to penetrate perpendicularly to the cooling surface 2a1 and is large enough to allow the first supply unit 4 to pass through. The first supply unit 4 passes through the through-hole 2k from the surface opposite the cooling surface 2a1 and is fixed in a state where a portion of it protrudes from the cooling surface 2a1. With the screw hole 4a disposed inside the housing 2, the first supply unit 4 is fixed to the third peripheral wall 2d near the first peripheral wall 2b by, for example, a fastener (not shown).

[0046] In this embodiment, only the first supply unit 4 is disposed on the side of the lid wall 2a by passing through the through-hole 2k, but this is not limiting, and the second supply unit 5 may also be disposed on the side of the lid wall 2a by passing through a through-hole in a similar manner.Furthermore, a configuration in which only the second supply unit 5 is disposed on the side of the lid wall 2a by passing through a through-hole may also be used.

[0047] As described above, in the power conversion device 1 according to the second embodiment, one or both of the first supply unit 4 and the second supply unit 5 are disposed on the cover wall 2a. Therefore, even if the layout of the vehicle makes it impossible to dispose one or both of the first supply unit 4 and the second supply unit 5 on the side of the peripheral wall of the housing 2 and they must be disposed on the side of the cover wall 2a, and even if the disposition of these units needs to be changed for each vehicle model, the expensive large component can be standardized across various vehicle models without changing the shape of the power conversion unit 3, which is an expensive large component, thereby reducing component costs. Because component costs are reduced, the cost of the power conversion device 1 can be reduced. Furthermore, because the specifications of the power conversion unit 3, which is an expensive large component, are not changed, the production volume of the expensive large component can be easily increased.

[0048] Embodiment 3 A power conversion device 1 according to embodiment 3 will be described. Fig. 9 is a plan view showing an outline of the power conversion device 1 according to embodiment 3. In the power conversion device 1 according to embodiment 3, the shapes of the first wiring portion 6 and the second wiring portion 7 are configured differently from those in embodiment 1.

[0049] In the first and second embodiments, as an example of the first wiring portion 6 and the second wiring portion 7, Fig. 1 and the like show shapes in which the first wiring portion 6 and the second wiring portion 7 can be attached with the direction of extension toward the third peripheral wall 2d side or the fourth peripheral wall 2e side reversed. The shapes of the first wiring portion 6 and the second wiring portion 7 are not limited to this, and as shown in the present embodiment, the shapes of the first wiring portion 6 and the second wiring portion 7 may be bilaterally symmetrical, and even with a bilaterally symmetrical shape, the same effect as shown in the first embodiment can be obtained.

[0050] One or both of the first wiring portion 6 and the second wiring portion 7 extend from the first connecting portion 3b or the second connecting portion 3c toward the third peripheral wall 2d and the fourth peripheral wall 2e. In the present embodiment, as shown in Fig. 9, both the first wiring portion 6 and the second wiring portion 7 extend from the first connecting portion 3b or the second connecting portion 3c toward the third peripheral wall 2d and the fourth peripheral wall 2e.

[0051] 1, the first wiring portion 6 has an extending portion 6a extending from the first connecting portion 3b in the direction of the fourth peripheral wall 2e, and a through hole 6b is provided at an end of the extending portion 6a. In addition to the configuration of the second wiring portion 7 shown in Fig. 1, the second wiring portion 7 has an extending portion 7a extending from the second connecting portion 3c in the direction of the third peripheral wall 2d, and a through hole 7b is provided at an end of the extending portion 7a.

[0052] In the present embodiment, the first wiring portion 6 has an extending portion 6a extending from the first connecting portion 3b to the vicinity of the fourth peripheral wall 2e, but this is not limiting. When the first supply portion 4 is disposed on the fourth peripheral wall 2e side, the first wiring portion 6a may have an extending portion 6a extending from the first connecting portion 3b to the vicinity of the third peripheral wall 2d. Similarly, the second wiring portion 7 has an extending portion 7a extending from the second connecting portion 3c to the vicinity of the third peripheral wall 2d, but this is not limiting. When the second supply portion 5 is disposed on the third peripheral wall 2d side, the second wiring portion 7a may have an extending portion 7a extending from the second connecting portion 3c to the vicinity of the fourth peripheral wall 2e.

[0053] Furthermore, in the present embodiment, through holes 6b, 7b are provided at the ends of the extending portion 6a of the first wiring portion 6 and the extending portion 7a of the second wiring portion 7, but this is not limiting. The ends of the extending portion 6a and the extending portion 7a may have a shape according to the method of connection with the first supply portion 4 and the second supply portion 5, and for example, screw holes may be provided at the ends of the extending portion 6a and the extending portion 7a to be fastened from the first supply portion 4 and the second supply portion 5 side.

[0054] As described above, in the power conversion device 1 according to embodiment 3, one or both of the first wiring portion 6 and the second wiring portion 7 extend from the first connecting portion 3b or the second connecting portion 3c toward the third peripheral wall 2d and the fourth peripheral wall 2e. This allows for changes in the arrangement of the first supply portion 4 or the second supply portion 5 for each vehicle model without changing the shapes of the first wiring portion 6 and the second wiring portion 7. Furthermore, since the first wiring portion 6 and the second wiring portion 7 can be standardized across a variety of vehicle models, the costs of the first wiring portion 6 and the second wiring portion 7 can be reduced. Since the costs of the first wiring portion 6 and the second wiring portion 7 are reduced, the cost of the power conversion device 1 can be reduced. Furthermore, since the first wiring portion 6 and the second wiring portion 7 can be standardized, the number of vehicles produced that use standardized parts can be easily increased.

[0055] Furthermore, since the extension portions 6a and 7a extend to the vicinity of the third peripheral wall 2d and the vicinity of the fourth peripheral wall 2e, the first connection portion 3b and the second connection portion 3c do not need to be positioned in a central position between the third peripheral wall 2d and the fourth peripheral wall 2e, which improves the freedom of layout of the components of the first connection portion 3b, the second connection portion 3c, and the power conversion circuit 3a.

[0056] Embodiment 4 A power conversion device 1 according to embodiment 4 will be described. Fig. 10 is a perspective view showing an outline of the housing 2 of the power conversion device 1 according to embodiment 4. The housing 2 of the power conversion device 1 according to embodiment 4 has a configuration in which through holes 2j are formed in both the third peripheral wall 2d and the fourth peripheral wall 2e.

[0057] The housing 2 has through holes 2j in both the third peripheral wall 2d and the fourth peripheral wall 2e. The number of through holes 2j formed in one peripheral wall may be one or more. In this embodiment, two through holes 2j are provided in the third peripheral wall 2d and two are provided in the fourth peripheral wall 2e. The through holes 2j are provided in shapes corresponding to the positions and shapes of the first supply unit 4 and the second supply unit 5. The first supply unit 4 and the second supply unit 5 are formed by, for example, connectors. The connectors pass through the through holes 2j in the direction of the dashed arrows in the figure and are fixed to the walls they pass through.

[0058] As described above, in the power conversion device 1 according to the fourth embodiment, the housing 2 has the through-holes 2j in both the third peripheral wall 2d and the fourth peripheral wall 2e, and therefore, it is possible to easily accommodate changes in the arrangement of the first supply unit 4 or the second supply unit 5 for each vehicle model without changing the shape of the housing 2. Furthermore, since the housing 2 can be standardized for a variety of vehicle models, the cost of the housing 2 can be reduced. Since the cost of the housing 2 is reduced, the cost of the power conversion device 1 can be reduced. Furthermore, since the housing 2 can be standardized, it is possible to easily increase the number of units of the standardized housing 2 that can be produced.

[0059] In the present embodiment, the third peripheral wall 2d and the fourth peripheral wall 2e both have through-holes 2j, and the first supply unit 4 and the second supply unit 5 are fixed to the third peripheral wall 2d and the fourth peripheral wall 2e, respectively. However, the present invention is not limited to this. As described in the arrangement of the first supply unit 4 in the second embodiment, the housing 2 may have a through-hole 2k penetrating the cover wall 2a, and one or both of the first supply unit 4 and the second supply unit 5 may be disposed in the cover wall 2a through the through-hole 2k.

[0060] Embodiment 5. A power conversion device 1 according to embodiment 5 will be described. Fig. 11 is a plan view showing an outline of the power conversion device 1 according to embodiment 5. In the power conversion device 1 according to embodiment 5, the power conversion unit 3 has a control circuit 3d and a control connection unit 3e.

[0061] The power conversion unit 3 includes a control circuit 3d that controls the operation of the power conversion circuit 3a, and a control connection unit 3e that electrically connects the control circuit 3d to the outside. The power conversion device 1 further includes a control wiring unit 13 electrically connected to the control connection unit 3e, and a third supply unit 12 electrically connected to the control wiring unit 13. The third supply unit 12 supplies a signal from an external device to the control circuit 3d via the control wiring unit 13. Based on the supplied signal, the control circuit 3d controls the operation of the power conversion circuit 3a.

[0062] The control connection unit 3e is arranged adjacent to the second connection unit 3c at the end of the power conversion unit 3 on the second circumferential wall 2c side. The control connection unit 3e is configured, for example, by a connector mounted on a printed circuit board (not shown) provided inside the power conversion unit 3. The third supply unit 12 is arranged adjacent to the second supply unit 5. In this embodiment, the second supply unit 5 is provided on the fourth circumferential wall 2e, and therefore the third supply unit 12 is arranged on the fourth circumferential wall 2e adjacent to the second supply unit 5. The third supply unit 12 is configured, for example, by a sheet metal part (not shown) made of a metal material such as copper having excellent conductivity and covered with an insulating resin.

[0063] Control wiring unit 13 is formed of, for example, a lead wire made of a metal material such as copper having excellent conductivity and covered with an insulating coating. One end of control wiring unit 13 is provided with a connector that fits with the connector of control connection unit 3e. The other end of control wiring unit 13 is provided with a press-fit terminal (not shown) that is press-fitted and joined to a sheet metal part of third supply unit 12. By fitting one end of control wiring unit 13 with the connector of control connection unit 3e and press-fitting the other end of control wiring unit 13 to third supply unit 12, control connection unit 3e and third supply unit 12 are electrically connected via control wiring unit 13.

[0064] In the present embodiment, the third supply unit 12 is disposed on the fourth peripheral wall 2e adjacent to the second supply unit 5, but the arrangement of the third supply unit 12 is not limited to this. As described in the arrangement of the first supply unit 4 in the second embodiment, the housing 2 may have a through-hole 2k penetrating the cover wall 2a, and the third supply unit 12 may pass through the through-hole 2k and be disposed on the cover wall 2a adjacent to the fourth peripheral wall 2e.

[0065] In this embodiment, a connector is provided at control connection unit 3e, lead wires are provided at control wiring unit 13, a connector is provided at one end of control wiring unit 13, and a press-fit terminal is provided at the other end of control wiring unit 13, but this is not limitative. For example, a configuration may be adopted in which control connection unit 3e is configured with multiple through holes on a substrate, control wiring unit 13 is formed by extending a sheet metal component of third supply unit 12, the extended tip of control wiring unit 13 is inserted into the through hole, and both are fixed by soldering.

[0066] As described above, in the power conversion device 1 according to the fifth embodiment, the control connection unit 3e is disposed adjacent to the second connection unit 3c at the end of the power conversion unit 3 on the side of the second circumferential wall 2c, and the third supply unit 12 is disposed adjacent to the second supply unit 5. Therefore, even if the location of the third supply unit 12 needs to be changed for each vehicle model, the shape of the power conversion unit 3, which is an expensive, large component, can be made common across a variety of vehicle models, thereby reducing component costs. Because component costs are reduced, the cost of the power conversion device 1 can be reduced. Furthermore, because the specifications of the power conversion unit 3, which is an expensive, large component, do not change, the production volume of the expensive, large component can be easily increased.

[0067] In this embodiment, the power conversion unit 3 is a DC-DC converter that converts DC power. The DC-DC converter is connected to a low-voltage battery (e.g., 12 V), which is an external device, at the second supply unit 5. Therefore, the second connection unit 3c, the second supply unit 5, and the second wiring unit 7 are all low-voltage systems. By arranging the control wiring unit 13, which is also a low-voltage system, on the second connection unit 3c side rather than on the first connection unit 3b side, which is a high-voltage system, the distances between components such as between the second connection unit 3c and the control connection unit 3e, between the second wiring unit 7 and the control wiring unit 13, and between the second supply unit 5 and the fourth supply unit 15 are reduced, thereby making it possible to miniaturize the power conversion device 1.

[0068] Embodiment 6 A power conversion device 1 according to embodiment 6 will be described. Fig. 12 is a plan view showing an outline of the power conversion device 1 according to embodiment 6, Fig. 13 is a cross-sectional view of the power conversion device 1 taken along the line DD in Fig. 12, and Figs. 14 to 20 are plan views showing an outline of another power conversion device 1 according to embodiment 6. The power conversion device 1 according to embodiment 6 is configured to include an additional power conversion unit 14.

[0069] The power conversion device 1 has a power conversion circuit (not shown) that converts power, and includes an additional power conversion unit 14 electrically connected to the power conversion unit 3. The housing 2 has a partition wall 2n that separates one opening side of the four peripheral walls from the other opening side. The power conversion unit 3 is fixed to a surface of the partition wall 2n on one opening side, and the additional power conversion unit 14 is fixed to a surface of the partition wall 2n on the other opening side. The surface of the partition wall 2n to which the power conversion unit 3 is fixed is referred to as a first cooling surface 2n1, and the surface of the partition wall 2n to which the additional power conversion unit 14 is fixed is referred to as a second cooling surface 2n2.

[0070] With this configuration, even if an additional power conversion unit 14 is further provided in the power conversion device 1, the shape of the power conversion unit 3, which is an expensive, large component, does not need to be changed, and the expensive, large component can be standardized across a variety of vehicle models, thereby reducing component costs. Because component costs are reduced, the cost of the power conversion device 1 can be reduced. Furthermore, because the specifications of the power conversion unit 3, which is an expensive, large component, do not change, the number of expensive, large components produced can be easily increased. Furthermore, the power conversion device 1 can be made smaller.

[0071] The partition wall 2n has at least one through-hole penetrating the partition wall 2n, and one or both of the first supply unit 4 and the second supply unit 5 penetrate the through-hole. In this embodiment, as shown in FIG. 13 , the partition wall 2n has a through-hole 2m, and the first supply unit 4 penetrates the through-hole 2m and protrudes from the side where the additional power conversion unit 14 is provided to the side where the power conversion unit 3 is provided. The first supply unit 4 may be disposed through the through-hole 2m as long as it is disposed adjacent to the end of the third peripheral wall 2d on the first peripheral wall 2b side. The first supply unit 4 constitutes a portion that electrically connects the power conversion unit 3 and the additional power conversion unit 14. Configuring the first supply unit 4 in this manner increases the number of arrangement patterns for the first supply unit 4. Furthermore, because the first supply unit 4 is disposed through the through-hole 2m, it is housed inside the housing 2, allowing the power conversion device 1 to be miniaturized.

[0072] In this embodiment, the first supply unit 4 extends from the additional power conversion unit 14. The first supply unit 4 is configured, for example, by covering a sheet metal part (not shown) made of a metal material such as copper, which has excellent conductivity, with an insulating resin. A screw hole 4a is provided at an end of the first supply unit 4. One end of the first supply unit 4 is electrically connected to the additional power conversion unit 14, and the other end is electrically connected to the first wiring unit 6. The first supply unit 4 is not limited to a configuration in which it extends from the additional power conversion unit 14; the first supply unit 4 and the additional power conversion unit 14 may be configured separately. By configuring the first supply unit 4, which electrically connects the power conversion unit 3 and the additional power conversion unit 14, to extend from the additional power conversion unit 14, additional connecting components for connecting the first supply unit 4 and the additional power conversion unit 14 are not required, thereby reducing the cost of the power conversion device 1. Furthermore, the space required for providing the additional connecting components is reduced, thereby reducing the size of the power conversion device 1.

[0073] In this embodiment, the housing 2 has a refrigerant flow path 2f that cools the power conversion unit 3 and the additional power conversion unit 14, an inlet pipe 2g that introduces the refrigerant into the refrigerant flow path 2f, and an outlet pipe 2h that introduces the refrigerant from the refrigerant flow path 2f. The refrigerant flow path 2f is formed in a partition wall 2n. The power conversion unit 3 and the additional power conversion unit 14 are thermally connected to the partition wall 2n. With this configuration, because the refrigerant flow path 2f is formed in the partition wall 2n, both the power conversion unit 3 and the additional power conversion unit 14 can be efficiently cooled without increasing the size of the power conversion device 1.

[0074] The power conversion device 1 includes a fourth supply unit 15 that electrically connects the additional power conversion unit 14 to the outside. The fourth supply unit 15 is arranged on the first circumferential wall 2b or the second circumferential wall 2c on the other opening side. In the present embodiment shown in FIG. 12, the fourth supply unit 15 is arranged on the second circumferential wall 2c on the other opening side. The external device connected to the fourth supply unit 15 is, for example, a drive motor. The fourth supply unit 15 supplies power from the additional power conversion unit 14 to the external device. Alternatively, the fourth supply unit 15 supplies power from the external device to the additional power conversion unit 14.

[0075] The fourth supply unit 15 is configured, for example, by a sheet metal part (not shown) made of a metal material such as copper having excellent conductivity and covered with an insulating resin. The fourth supply unit 15 passes through a through hole provided in the second peripheral wall 2c and is fixed to the second peripheral wall 2c with a fastener such as a screw. Details of the method of electrically connecting the additional power conversion unit 14 and the fourth supply unit 15 are omitted.

[0076] In cases where fourth supply unit 15 is connected to a drive motor, for example, fourth supply unit 15 becomes larger. Even if fourth supply unit 15 becomes larger when fourth supply unit 15 is arranged on first circumferential wall 2b or second circumferential wall 2c on the other opening side, the present application is configured such that first supply unit 4, second supply unit 5, inlet pipe 2g, and outlet pipe 2h are arranged on the third circumferential wall 2d or fourth circumferential wall 2e side, and therefore, the arrangement of the supply units can be flexibly selected without affecting the arrangement of other supply units, etc.

[0077] In this embodiment, the power conversion unit 3 is a DC-DC converter that converts DC power, and the additional power conversion unit 14 is an inverter that converts DC power and AC power. The additional power conversion unit 14 is composed of, for example, a switching element, a transformer, a smoothing reactor, a capacitor, etc. The configurations of the power conversion unit 3 and the additional power conversion unit 14 are not limited to this. The additional power conversion unit 14 may be a charger that converts commercial AC power into DC power and charges the high-voltage battery, or may be an inverter that converts DC power from the high-voltage battery into AC power for the motor. The power conversion device 1 can have both an inverter function and a converter function. Note that the arrangement and shapes of the components that make up the additional power conversion unit 14 are not shown in the figure.

[0078] If the power conversion unit 3 is a DC-DC converter and the additional power conversion unit 14 is an inverter, the fourth supply unit 15 will be large. Even if the fourth supply unit 15 is large, in the present application, the first supply unit 4, the second supply unit 5, the inlet pipe 2g, and the outlet pipe 2h are arranged on the third circumferential wall 2d or the fourth circumferential wall 2e side. This configuration allows for flexible selection of the arrangement of the supply units without affecting the arrangement of other supply units. Furthermore, since the fourth supply unit 15 can be arranged on either the first circumferential wall 2b or the second circumferential wall 2c on the other opening side, no supply unit is provided on either the first circumferential wall 2b or the second circumferential wall 2c. Therefore, a circumferential wall without a supply unit, an inlet pipe, or an outlet pipe can be provided due to vehicle installation space limitations.

[0079] 12 in this embodiment, the first supply unit 4 is disposed adjacent to the end of the third circumferential wall 2d on the side of the first circumferential wall 2b, the second supply unit 5 is disposed adjacent to the end of the fourth circumferential wall 2e on the side of the second circumferential wall 2c, and the fourth supply unit 15 is disposed on the second circumferential wall 2c, but this is not limited to this. The first supply unit 4, the second supply unit 5, and the fourth supply unit 15 may be disposed as shown below.

[0080] In Fig. 14 of this embodiment, the first supply unit 4 is arranged adjacent to the end of the fourth circumferential wall 2e on the first circumferential wall 2b side, the second supply unit 5 is arranged adjacent to the end of the third circumferential wall 2d on the second circumferential wall 2c side, and the fourth supply unit 15 is arranged on the second circumferential wall 2c. In Fig. 15 of this embodiment, the first supply unit 4 is arranged adjacent to the end of the third circumferential wall 2d on the first circumferential wall 2b side, the second supply unit 5 is arranged adjacent to the end of the fourth circumferential wall 2e on the second circumferential wall 2c side, and the fourth supply unit 15 is arranged on the first circumferential wall 2b. In Fig. 16 of this embodiment, the first supply unit 4 is arranged adjacent to the end of the fourth circumferential wall 2e on the first circumferential wall 2b side, the second supply unit 5 is arranged adjacent to the end of the third circumferential wall 2d on the second circumferential wall 2c side, and the fourth supply unit 15 is arranged on the first circumferential wall 2b. In Figure 17 of this embodiment, the first supply section 4 is arranged adjacent to the end of the third peripheral wall 2d on the side of the first peripheral wall 2b, the second supply section 5 is arranged adjacent to the end of the third peripheral wall 2d on the side of the second peripheral wall 2c, and the fourth supply section 15 is arranged on the first peripheral wall 2b.

[0081] In Fig. 18 of this embodiment, the first supply unit 4 is arranged adjacent to the end of the fourth circumferential wall 2e on the first circumferential wall 2b side, the second supply unit 5 is arranged adjacent to the end of the fourth circumferential wall 2e on the second circumferential wall 2c side, and the fourth supply unit 15 is arranged on the first circumferential wall 2b. In Fig. 19 of this embodiment, the first supply unit 4 is arranged adjacent to the end of the fourth circumferential wall 2e on the first circumferential wall 2b side, the second supply unit 5 is arranged adjacent to the end of the fourth circumferential wall 2e on the second circumferential wall 2c side, and the fourth supply unit 15 is arranged on the second circumferential wall 2c. In Fig. 20 of this embodiment, the first supply unit 4 is arranged adjacent to the end of the third circumferential wall 2d on the first circumferential wall 2b side, the second supply unit 5 is arranged adjacent to the end of the third circumferential wall 2d on the second circumferential wall 2c side, and the fourth supply unit 15 is arranged on the second circumferential wall 2c.

[0082] As described above, the power conversion device 1 according to the sixth embodiment includes the additional power conversion unit 14 electrically connected to the power conversion unit 3, the housing 2 has a partition wall 2n separating one opening side from the other opening side of the four peripheral walls, the power conversion unit 3 is fixed to one opening side surface of the partition wall 2n, and the additional power conversion unit 14 is fixed to the other opening side surface of the partition wall 2n. Therefore, even if the additional power conversion unit 14 is further provided in the power conversion device 1, the shape of the power conversion unit 3, which is an expensive, large component, does not need to be changed, and the expensive, large component can be standardized across various vehicle models, thereby reducing component costs. Because the component costs are reduced, the cost of the power conversion device 1 can be reduced. Furthermore, because the specifications of the power conversion unit 3, which is an expensive, large component, do not need to be changed, the production volume of the expensive, large component can be easily increased.

[0083] In a power conversion device that integrates multiple power conversion units, the number of supply units such as connectors increases, and it is necessary to arrange various supply units and inlet and outlet pipes for the cooling fluid within a limited space, which increases the need for flexibility. The configuration disclosed in this application allows for flexible selection of the placement of supply units without affecting the placement of other supply units, etc.

[0084] When the partition wall 2n has at least one through-hole penetrating the partition wall 2n and one or both of the first supply unit 4 and the second supply unit 5 penetrate the through-hole, it is possible to increase the number of arrangement patterns of the first supply unit 4. Furthermore, since the first supply unit 4 is arranged penetrating the through-hole 2m, the first supply unit 4 is housed inside the housing 2, and therefore the power conversion device 1 can be made smaller.

[0085] When the first supply unit 4 is provided extending from the additional power conversion unit 14, there is no need for additional connecting parts for connecting the first supply unit 4 and the additional power conversion unit 14, which reduces the cost of the power conversion device 1. Furthermore, since the space required for providing the additional connecting parts is reduced, the power conversion device 1 can be made smaller.

[0086] The housing 2 has a refrigerant flow path 2f that cools the power conversion unit 3 and the additional power conversion unit 14, an inlet pipe 2g that flows the refrigerant into the refrigerant flow path 2f, and an outlet pipe 2h that flows the refrigerant out of the refrigerant flow path 2f, and when the refrigerant flow path 2f is formed in the partition wall 2n and the power conversion unit 3 and the additional power conversion unit 14 are thermally connected to the partition wall 2n, since the refrigerant flow path 2f is formed in the partition wall 2n, both the power conversion unit 3 and the additional power conversion unit 14 can be efficiently cooled without increasing the size of the power conversion device 1.

[0087] When the power conversion device 1 is provided with a fourth supply unit 15 that electrically connects the additional power conversion unit 14 to the outside, and the fourth supply unit 15 is arranged on the first peripheral wall 2b or the second peripheral wall 2c on the other opening side, even if the fourth supply unit 15 becomes large when connected to a drive motor, etc., the present application is configured such that the first supply unit 4, the second supply unit 5, the inlet pipe 2g, and the outlet pipe 2h are arranged on the side of the third peripheral wall 2d or the fourth peripheral wall 2e, so that the placement of the supply units can be flexibly selected without affecting the placement of other supply units, etc.

[0088] When the power conversion unit 3 is a DC-DC converter that converts DC power and the additional power conversion unit 14 is an inverter that converts DC power and AC power, even if the fourth supply unit 15 is large, the first supply unit 4, the second supply unit 5, the inlet pipe 2g, and the outlet pipe 2h are arranged on the third circumferential wall 2d or the fourth circumferential wall 2e side in the present application, and therefore the arrangement of the supply units can be flexibly selected without affecting the arrangement of the other supply units, etc. Furthermore, because the fourth supply unit 15 can be arranged on either the first circumferential wall 2b or the second circumferential wall 2c on the other opening side, no supply unit is provided on either the first circumferential wall 2b or the second circumferential wall 2c, and therefore a circumferential wall without a supply unit, inlet pipe, or outlet pipe can be provided due to the limited installation space in the vehicle.

[0089] Embodiment 7 A power conversion device 1 according to embodiment 7 will be described. Fig. 21 is a plan view showing an outline of the power conversion device 1 according to embodiment 7, and Fig. 22 is a cross-sectional view of the power conversion device 1 taken along the E-E cross section of Fig. 21. In the power conversion device 1 according to embodiment 7, the shape of the first wiring section 6 is configured differently from that in embodiment 6.

[0090] 22, the partition wall 2n has a through-hole 2m penetrating the partition wall 2n, and the first supply unit 4 extends from the additional power conversion unit 14 and is provided adjacent to the through-hole 2m. The first wiring unit 6 passes through the through-hole 2m and is electrically connected to the first supply unit 4.

[0091] The first supply unit 4 has a threaded hole 4a. The first supply unit 4 is provided with the threaded hole 4a disposed on the side of the additional power conversion unit 14. The first wiring unit 6 is bent on the side of the first cooling surface 2n1, and then passes through the through-hole 2m to extend to the side of the additional power conversion unit 14. The first wiring unit 6 is fixed to the threaded hole 4a provided in the first supply unit 4 by a screw 9. The screw 9 is fastened to the threaded hole 4a by utilizing a through-hole provided in the third peripheral wall 2d. The first wiring unit 6 is electrically connected to the additional power conversion unit 14 via the first supply unit 4.

[0092] As described above, in the power conversion device 1 according to embodiment 7, the first supply unit 4 extends from the additional power conversion unit 14 and is provided adjacent to the through-hole 2m, and the first wiring unit 6 passes through the through-hole 2m and is electrically connected to the first supply unit 4. Therefore, the part connecting the power conversion unit 3 and the additional power conversion unit 14 is housed inside the housing 2, and the power conversion device 1 can be made smaller.

[0093] The power conversion device 1 disclosed in the present application is mounted on, for example, a vehicle 20 for use, as shown in FIG. 26 . FIG. 26 is a diagram illustrating an example of an installation state of the power conversion device 1 disclosed in the present application. The power conversion device 1 has a housing 2 fixed to the vehicle 20. In FIG. 26 , the housing 2 is indicated by a dashed line. The part of the vehicle 20 to which the housing 2 is fixed is, for example, a drive motor 21. With the power conversion device 1 configured as described above, a low-cost power conversion device 1 can be mounted even in a vehicle 20 where low cost is strictly required. Furthermore, with the power conversion device 1 disclosed in the present application, a peripheral wall can be provided that does not have a supply unit, inflow pipe, or outflow pipe, and therefore the power conversion device 1 can be easily fixed to the vehicle 20 at a peripheral wall that does not have a supply unit, inflow pipe, or outflow pipe.

[0094] Furthermore, although the present application describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments are not limited to application to a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless variations not illustrated are conceivable within the scope of the technology disclosed in the present specification, including, for example, cases where at least one component is modified, added, or omitted, and cases where at least one component is extracted and combined with components of another embodiment.

[0095] Various aspects of the present disclosure are summarized below as appendices. (Appendix 1) a power conversion unit including a power conversion circuit that converts electric power and a first connection part and a second connection part that electrically connect the power conversion circuit to an external device; a first wiring portion electrically connected to the first connection portion; a second wiring portion electrically connected to the second connection portion; a first supply section electrically connected to the first wiring section; a second supply section electrically connected to the second wiring section; a housing having four rectangular cylindrical peripheral walls and accommodating the power conversion unit, the first wiring unit, and the second wiring unit; the four peripheral walls are a first peripheral wall, a second peripheral wall facing the first peripheral wall, a third peripheral wall, and a fourth peripheral wall facing the third peripheral wall, the first connection portion is provided at an end portion of the power conversion unit on the first circumferential wall side, the second connection portion is provided at an end portion of the power conversion portion on the second circumferential wall side, the first supply portion is disposed adjacent to an end portion of the third circumferential wall or the fourth circumferential wall on the first circumferential wall side, the second supply portion is disposed adjacent to an end portion of the third circumferential wall or the fourth circumferential wall on the second circumferential wall side, the first wiring portion extends along the first peripheral wall between the first connection portion and the first supply portion; The second wiring portion extends along the second peripheral wall between the second connection portion and the second supply portion. (Appendix 2) A power conversion device as described in Appendix 1, wherein one or both of the first connection portion and the second connection portion are arranged at a central position between the third peripheral wall and the fourth peripheral wall. (Appendix 3) A power conversion device as described in Appendix 2, wherein one or both of the first wiring section and the second wiring section are shaped so that they can be installed by reversing the extension direction toward the third peripheral wall side or the fourth peripheral wall side. (Appendix 4) A power conversion device as described in Appendix 1 or 2, wherein one or both of the first wiring portion and the second wiring portion extend from the first connection portion or the second connection portion to the third peripheral wall side and the fourth peripheral wall side. (Appendix 5) the first supply unit and the second supply unit are formed by connectors, 5. The power conversion device according to claim 1, wherein the connector is fixed to a cover wall that covers an opening in one of the four peripheral walls, or to one of the four peripheral walls. (Appendix 6) the housing has through holes in both the third peripheral wall and the fourth peripheral wall, 6. The power conversion device according to claim 5, wherein the connector passes through the through hole and is fixed to the wall through which it passes. (Appendix 7) the power conversion unit includes a control circuit that controls the operation of the power conversion circuit, and a control connection unit that electrically connects the control circuit to an external device; a control wiring portion electrically connected to the control connection portion; a third supply unit electrically connected to the control wiring unit, the control connection portion is disposed adjacent to the second connection portion at an end portion of the power conversion portion on the second circumferential wall side, 7. The power conversion device according to claim 1, wherein the third supply unit is disposed adjacent to the second supply unit. (Appendix 8) the housing includes a refrigerant flow path that cools the power conversion unit, an inlet pipe that causes the refrigerant to flow into the refrigerant flow path, and an outlet pipe that causes the refrigerant to flow out of the refrigerant flow path, the power conversion unit is thermally connected to the housing; 8. The power conversion device according to claim 1, wherein at least one of the inlet pipe and the outlet pipe is arranged on the side of the third circumferential wall or the side of the fourth circumferential wall. (Appendix 9) a power conversion circuit for converting power, the power conversion circuit including an additional power conversion unit electrically connected to the power conversion unit; the housing has a partition wall separating one opening side of the four peripheral walls from the other opening side, 5. The power conversion device according to claim 1, wherein the power conversion unit is fixed to a surface of the partition wall on one side of the opening, and the additional power conversion unit is fixed to a surface of the partition wall on the other side of the opening. (Appendix 10) the partition wall has at least one penetration portion penetrating the partition wall, 10. The power conversion device according to claim 9, wherein one or both of the first supply unit and the second supply unit pass through the through-portion. (Appendix 11) 11. The power conversion device according to claim 10, wherein the first supply unit is provided extending from the additional power conversion unit. (Appendix 12) the partition wall has a through-hole that penetrates the partition wall, the first supply unit extends from the additional power conversion unit and is provided adjacent to the through-portion, 10. The power conversion device according to claim 9, wherein the first wiring portion passes through the through portion and is electrically connected to the first supply portion. (Appendix 13) the housing includes a refrigerant flow path that cools the power conversion unit and the additional power conversion unit, an inlet pipe that causes the refrigerant to flow into the refrigerant flow path, and an outlet pipe that causes the refrigerant to flow out of the refrigerant flow path, The refrigerant flow path is formed in the partition wall, 13. The power conversion device according to any one of claims 9 to 12, wherein the power conversion unit and the additional power conversion unit are thermally connected to the partition wall. (Appendix 14) a fourth supply unit that electrically connects the additional power conversion unit to an outside; The power conversion device according to any one of appendixes 9 to 13, wherein the fourth supply unit is disposed on the first circumferential wall or the second circumferential wall on the other opening side. (Appendix 15) 2. The power conversion device according to claim 1, wherein the power conversion unit is a DC-DC converter that converts direct current power. (Appendix 16) the power conversion unit is a DC-DC converter that converts direct current power, 15. The power conversion device according to any one of appendixes 9 to 14, wherein the additional power conversion unit is an inverter that converts between DC power and AC power. (Appendix 17) 17. The power conversion device according to any one of appendixes 1 to 16, wherein the housing is fixed to a vehicle. [Explanation of symbols]

[0096] 1 Power converter, 2 Housing, 2a Lid wall, 2a1 Cooling surface, 2a2 Inlet pipe through hole, 2a3 Outlet pipe through hole, 2b First peripheral wall, 2c Second peripheral wall, 2d Third peripheral wall, 2e Fourth peripheral wall, 2f Refrigerant channel, 2g Inlet pipe, 2h Outlet pipe, 2j Through hole, 2k Through hole, 2m Penetrating part, 2n Partition wall, 2n1 first cooling surface, 2n2 second cooling surface, 3 power conversion section, 3a power conversion circuit, 3b first connection section, 3c second connection section, 3d control circuit, 3e control connection section, 4 first supply section, 4a screw hole, 5 second supply section, 5a screw hole, 6 first wiring section, 6a extension section, 6b through hole, 7 second wiring section, 7a extension section, 7b Through holes, 8, 9, 10, 11 Screws, 12 Third supply unit, 13 control wiring unit, 14 additional power conversion unit, 15 fourth supply unit, 20 vehicle, 21 drive motor, 100 power conversion device, 101 cooling block, 102 input filter, 103 power module, 104 transformer, 105 choke coil, 106 smoothing capacitor, 107 inter-component connection unit, 108 input terminal, 109 output terminal, 110, 111 interface, 112, 113 wiring member

Claims

1. a power conversion unit including a power conversion circuit that converts electric power and a first connection part and a second connection part that electrically connect the power conversion circuit to an external device; a first wiring portion electrically connected to the first connection portion; a second wiring portion electrically connected to the second connection portion; a first supply section electrically connected to the first wiring section; a second supply section electrically connected to the second wiring section; a housing having four rectangular cylindrical peripheral walls and accommodating the power conversion unit, the first wiring unit, and the second wiring unit; the four peripheral walls are a first peripheral wall, a second peripheral wall facing the first peripheral wall, a third peripheral wall, and a fourth peripheral wall facing the third peripheral wall, the first connection portion is provided at an end portion of the power conversion unit on the first circumferential wall side, the second connection portion is provided at an end portion of the power conversion portion on the second circumferential wall side, the first supply portion is disposed adjacent to an end portion of the third circumferential wall or the fourth circumferential wall on the first circumferential wall side, the second supply portion is disposed adjacent to an end portion of the third circumferential wall or the fourth circumferential wall on the second circumferential wall side, the first wiring portion extends along the first peripheral wall between the first connection portion and the first supply portion; The second wiring portion extends along the second peripheral wall between the second connection portion and the second supply portion.

2. The power conversion device according to claim 1 , wherein one or both of the first connecting portion and the second connecting portion are disposed at a central position between the third peripheral wall and the fourth peripheral wall.

3. The power conversion device according to claim 2 , wherein one or both of the first wiring portion and the second wiring portion have a shape that allows them to be mounted with their extension direction toward the third peripheral wall side or the fourth peripheral wall side reversed.

4. The power conversion device according to claim 1, wherein one or both of the first wiring portion and the second wiring portion extend from the first connection portion or the second connection portion to the third peripheral wall side and the fourth peripheral wall side.

5. the first supply unit and the second supply unit are formed by connectors, The power conversion device according to claim 1 , wherein the connector is fixed to a cover wall covering an opening in one of the four peripheral walls or to the four peripheral walls.

6. the housing has through holes in both the third peripheral wall and the fourth peripheral wall, The power conversion device according to claim 5 , wherein the connector passes through the through hole and is fixed to a wall through which the connector passes.

7. the power conversion unit includes a control circuit that controls the operation of the power conversion circuit, and a control connection unit that electrically connects the control circuit to an external device; a control wiring portion electrically connected to the control connection portion; a third supply unit electrically connected to the control wiring unit, the control connection portion is disposed adjacent to the second connection portion at an end portion of the power conversion portion on the second circumferential wall side, The power conversion device according to claim 1 , wherein the third supply unit is disposed adjacent to the second supply unit.

8. the housing includes a refrigerant flow path that cools the power conversion unit, an inlet pipe that causes the refrigerant to flow into the refrigerant flow path, and an outlet pipe that causes the refrigerant to flow out of the refrigerant flow path, the power conversion unit is thermally connected to the housing; The power conversion device according to claim 1 , wherein at least one of the inlet pipe and the outlet pipe is disposed on the side of the third circumferential wall or the side of the fourth circumferential wall.

9. a power conversion circuit for converting power, the power conversion circuit including an additional power conversion unit electrically connected to the power conversion unit; the housing has a partition wall separating one opening side of the four peripheral walls from the other opening side, The power conversion device according to claim 1 , wherein the power conversion unit is fixed to a surface of the partition wall on one side of the opening, and the additional power conversion unit is fixed to a surface of the partition wall on the other side of the opening.

10. the partition wall has at least one penetration portion penetrating the partition wall, The power conversion device according to claim 9 , wherein one or both of the first supply unit and the second supply unit pass through the through-portion.

11. The power conversion device according to claim 10 , wherein the first supply unit is provided extending from the additional power conversion unit.

12. the partition wall has a through-hole that penetrates the partition wall, the first supply unit extends from the additional power conversion unit and is provided adjacent to the through-portion, The power conversion device according to claim 9 , wherein the first wiring portion passes through the through portion and is electrically connected to the first supply portion.

13. the housing includes a refrigerant flow path that cools the power conversion unit and the additional power conversion unit, an inlet pipe that causes the refrigerant to flow into the refrigerant flow path, and an outlet pipe that causes the refrigerant to flow out of the refrigerant flow path, The refrigerant flow path is formed in the partition wall, The power conversion device according to claim 9 , wherein the power conversion unit and the additional power conversion unit are thermally connected to the partition wall.

14. a fourth supply unit that electrically connects the additional power conversion unit to an outside; The power conversion device according to claim 9 , wherein the fourth supply unit is disposed on the first peripheral wall or the second peripheral wall on the other opening side.

15. 2. The power conversion device according to claim 1, wherein the power conversion unit is a DC-DC converter that converts direct current power.

16. the power conversion unit is a DC-DC converter that converts direct current power, The power conversion device according to claim 14 , wherein the additional power conversion unit is an inverter that converts between DC power and AC power.

17. The power conversion device according to claim 1 , wherein the housing is fixed to a vehicle.

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