Power converter

Abstract

To provide a power conversion device that suppresses temperature rise. [Solution] The power conversion device 30 includes a first power conversion circuit 130, a second power conversion circuit 230, a first cooling unit 180, and a second cooling unit 280. The first power conversion circuit and the second power conversion circuit are connected to a common battery. The first power conversion circuit converts the first DC power supplied from the battery into first drive power and supplies it to the first motor. The second power conversion circuit converts the second DC power supplied from the battery into second drive power and supplies it to the second motor. The first power conversion circuit is individually positioned opposite the first cooling unit. The second power conversion circuit is individually positioned opposite the second cooling unit.

Description

Technical Field

[0001] The disclosure described in this specification relates to a power conversion device.

Background Art

[0002] Patent Document 1 discloses an integrated power module having a first power module and a second power module.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The first power module described in Patent Document 1 supplies power to the first motor, and the second power module supplies power to the second motor. Thus, the power supply destinations of the first power module and the second power module are different.

[0005] Therefore, it is assumed that the heat generation amounts due to energization of the first power module and the second power module are different. It is required to suppress the temperature rise of the first power module and the second power module having different heat generation amounts.

[0006] An object of the present disclosure is to provide a power conversion device with suppressed temperature rise.

Means for Solving the Problems

[0007] A power conversion device according to the disclosed aspect includes a plurality of power conversion circuits (130, 230) that convert power supplied from a common power source (20) into drive power and individually supply the drive power to a plurality of different power devices (41, 42), It has multiple power conversion circuits and multiple cooling units (180, 280) that are individually positioned opposite each other.

[0008] According to this method, the temperatures of multiple power conversion circuits (130, 230) with different heat generation volumes can be controlled individually. As a result, the temperature rise of the power conversion device is suppressed.

[0009] The reference numbers in parentheses above merely indicate the correspondence with the configurations described in the embodiments below, and do not limit the technical scope in any way. [Brief explanation of the drawing]

[0010] [Figure 1] This is a circuit diagram showing an in-vehicle system. [Figure 2] This is a front view of the electromechanical integrated device. [Figure 3] This is a rear view of the integrated electromechanical device. [Figure 4] This is a side view of an integrated electromechanical device. [Figure 5] This is a top view of the electromechanical integrated unit with the top cover removed. [Figure 6] This is a top view of Figure 5, excluding the control board. [Figure 7] This is a top view of Figure 6 with the drive board removed. [Figure 8] This is a top view illustrating the locations of the power conversion unit and the capacitance unit. [Figure 9] This is a top view illustrating the position of the filter. [Figure 10] This is a top view illustrating the cooling section. [Figure 11] This is a top view of the power converter, excluding the control board and drive board. [Figure 12] This is a cross-sectional view along the line XII-XII shown in Figure 11. [Figure 13] This is a cross-sectional view along the line XIII-XIII shown in Figure 11. [Figure 14] This is a cross-sectional view along the line XIV-XIV shown in Figure 11. [Figure 15]It is a cross-sectional view taken along line XV-XV shown in FIG. 11. [Figure 16] It is a cross-sectional view taken along line XVI-XVI shown in FIG. 11. [Figure 17] It is a cross-sectional view taken along line XVII-XVII shown in FIG. 11. [Figure 18] It is a cross-sectional view taken along line XVIII-XVIII shown in FIG. 11. [Figure 19] It is a top view showing the arrangement of the first smoothing capacitor and the second smoothing capacitor. [Figure 20] It is a top view excluding the first capacitor housing and the second capacitor housing from FIG. 21. [Figure 21] It is a top view showing the 11th capacitor bus bar. [Figure 22] It is a top view showing the 12th capacitor bus bar.

Embodiments for Carrying Out the Invention

[0011] Embodiments for carrying out the present disclosure will be described while referring to the drawings. Parts corresponding to those described in the previous embodiments may be given the same reference numerals in the following embodiments and redundant descriptions may be omitted. When only a part of the configuration is described in each embodiment, the description of the other parts of the configuration can be applied to the previous embodiments.

[0012] Combinations are possible between parts that are explicitly shown to be combinable in each embodiment. In particular, combinations are possible between multiple embodiments, an embodiment and a modification, and multiple modifications, even if not explicitly shown to be combinable, as long as there is no problem with the combination.

[0013] In the following, three directions that are orthogonal to each other are shown as the X direction, the Y direction, and the Z direction. The X direction, the Y direction, and the Z direction are linear directions. In the drawings, the description of "direction" is omitted and only X, Y, and Z are shown.

[0014] When this disclosure is mounted on a vehicle, the X direction is aligned with the vehicle's left-right direction. The Y direction is aligned with the vehicle's forward and backward direction. The Z direction is aligned with the vehicle's up-down direction. When the vehicle is stationary on a horizontal plane, the plane defined by the X and Y directions is aligned with the horizontal direction. The Z direction is aligned with the vertical direction. The X direction corresponds to the lateral direction. The Y direction corresponds to the vertical direction. The Z direction corresponds to the height direction.

[0015] <First Embodiment> First, we will outline the in-vehicle system 10 shown in Figure 1. This in-vehicle system 10 constitutes a system for electric vehicles. The in-vehicle system 10 includes a battery 20, a power converter 30, and a motor 40. The power converter 30 and the motor 40 are housed in a common housing 50, forming a mechatronic integrated unit 60.

[0016] The in-vehicle system 10 has multiple ECUs (not shown). These multiple ECUs send and receive signals to each other via bus wiring. The multiple ECUs cooperate to control the electric vehicle. The powering and regeneration of the motor 40 are controlled according to the State of Charge (SOC) of the battery 20 by the control of the multiple ECUs. ECU stands for electronic control unit. SOC stands for state of charge.

[0017] An ECU comprises at least one arithmetic processing unit (CPU) and at least one memory device (MMR) as a recording medium for recording programs and data. The ECU is provided by a microcomputer equipped with a computer-readable recording medium. The recording medium is a non-transitional tangible recording medium that non-temporarily stores computer-readable programs. The recording medium may be provided by semiconductor memory or a magnetic disk, etc.

[0018] Battery 20 has multiple secondary batteries. These multiple secondary batteries form a battery stack connected in series. The state of charge (SOC) of this battery stack corresponds to the state of charge (SOC) of battery 20. As secondary batteries, solid-state batteries, lithium-ion secondary batteries, nickel-metal hydride secondary batteries, and organic radical batteries can be used. Battery 20 corresponds to the power source.

[0019] The power converter 30 converts the power flowing between the battery 20 and the motor 40. The power converter 30 converts the DC power from the battery 20 into AC power. The power converter 30 converts the AC power generated by the motor 40's power generation (regeneration) into DC power.

[0020] The motor 40 is connected to the axle of an electric vehicle (not shown). The rotational energy (power) of the motor 40 is transmitted to the wheels of the electric vehicle via the axle. Conversely, the rotational energy of the wheels is transmitted to the motor 40 via the axle.

[0021] The motor 40 is powered by alternating current (AC) electricity supplied from the power converter 30. This provides propulsion to the wheels. The motor 40 also regenerates energy from the rotational energy transmitted from the wheels. The AC electricity generated by this regeneration is converted into DC electricity by the power converter 30. This DC electricity is supplied to the battery 20 and various electrical loads installed in the electric vehicle.

[0022] In this embodiment, the motor 40 is connected to the rear axle of the electric vehicle. The motor 40 has a first motor 41 and a second motor 42. The electromechanical unit 60 housing the first motor 41 and the second motor 42 is installed between the left rear tire and the right rear tire of the vehicle. The first motor 41 and the second motor 42 correspond to power equipment.

[0023] The motor 40 may be connected to the front axle of the electric vehicle. The electromechanical unit 60 may be installed between the front tire on the left side of the vehicle and the front tire on the right side of the vehicle. The motor 40 and the axle may be directly connected, or they may be indirectly connected via a reduction gear or the like.

[0024] The first motor 41 and the rear tire on the left side of the vehicle are capable of mutually transmitting rotational energy. The second motor 42 and the rear tire on the right side of the vehicle are also capable of mutually transmitting rotational energy. The first drive power is supplied from the power converter 30 to the first motor 41. The second drive power is supplied from the power converter 30 to the second motor 42. The drives of the first motor 41 and the second motor 42 can be controlled individually.

[0025] <Power converter> The power converter 30 includes a first power converter 100 and a second power converter 200. The first power converter 100 and the second power converter 200 are individually electrically connected to a common power source, a battery 20. First DC power is supplied from the battery 20 to the first power converter 100. Second DC power is supplied from the battery 20 to the second power converter 200.

[0026] The first power converter 100 is electrically connected individually to the first motor 41. The second power converter 200 is electrically connected individually to the second motor 42. The first power converter 100 supplies the first drive power to the first motor 41. The second power converter 200 supplies the second drive power to the second motor 42.

[0027] <First Power Converter> The first power converter 100 includes a first power connector 110, a first filter 120, a first power conversion circuit 130, a first control board 140, a first drive board 150, a first output unit 160, and a first support unit 170.

[0028] The first power connector 110 has a first P busbar 111 and a first N busbar 112. The first wire harness 21 is connected to this first power connector 110. The first P busbar 111 and the first N busbar 112 are electrically connected to the battery 20 via the first wire harness 21. In Figure 1, the connection points of the various busbars are shown as white circles. These connection points are electrically connected, for example, by bolts or welding.

[0029] The first P busbar 111 and the first N busbar 112 are connected to the first power conversion circuit 130. This connects the first power conversion circuit 130 to the battery 20 via the first wire harness 21, the first P busbar 111, and the first N busbar 112. First DC power is supplied individually from the battery 20 to the first power conversion circuit 130.

[0030] The first filter 120 has a first capacitor 121 and a first resistor 122. The first capacitor 121 and the first resistor 122 are connected in series between the first P busbar 111 and the first N busbar 112. The first filter 120 performs the function of removing noise input to the first P busbar 111, the first N busbar 112, and the first power conversion circuit 130.

[0031] The first P busbar 111 and the first N busbar 112 are connected to the inverter of the first power conversion circuit 130. The inverter is connected to the first motor 41. The inverter converts the first DC power supplied from the first wire harness 21 into AC power. This AC power is supplied to the first motor 41 as the first drive power. The inverter also converts the AC power generated by the first motor 41 into DC power. This DC power is supplied to the battery 20. The first power conversion circuit 130 may also include a converter that boosts or lowers the input voltage before outputting it.

[0032] The first control board 140 has a first MGECU, which is one of several ECUs. The first control board 140 is shown as MGECU1 in the drawing. MGECU is an abbreviation for motor generator electronic control unit. The first MGECU generates a pulse signal as a control signal. The first MGECU adjusts the on-duty cycle and frequency of the pulse signal. The on-duty cycle and frequency are determined based on the outputs of various sensors (not shown). This control signal is output to the first drive board 150.

[0033] The first drive board 150 has a gate driver. The gate driver amplifies the control signal input from the first MGECU and outputs it to the inverter. This controls the opening and closing of the switches included in the inverter. Note that the first control board 140 and the first drive board 150 do not have to be separate components, but may be integrated into one unit.

[0034] When the first motor 41 is operating, the inverter switch is PWM controlled by the output of the control signal from the first MGECU. This generates AC power in the first power conversion circuit 130. This AC power is input to the first phase stator coil of the first motor 41 as the first drive power. This generates a rotating magnetic field. The interaction between this rotating magnetic field and the magnetic field generated from the rotor of the first motor 41 generates rotational torque in the rotor.

[0035] When the first motor 41 generates electricity (regenerates power) due to the rotational energy of the rear tires, the first MGECU, for example, stops outputting the control signal. As a result, the AC power generated by the power generation passes through the inverter's diode. Consequently, the AC power is converted to DC power.

[0036] The first output unit 160 has a first phase busbar. The first phase busbar connects the inverter of the first power conversion circuit 130 to the first phase stator coil of the first motor 41.

[0037] The first support portion 170 is made of a high-permeability material with higher magnetic permeability than air. Specifically, the first support portion 170 is made of a metal material such as aluminum or iron.

[0038] The first support section 170 is provided with a first power connector 110, a first filter 120, a first power conversion circuit 130, a first control board 140, a first drive board 150, and a first output stage 160.

[0039] A first cooling section 180 is formed in the first support section 170. The first cooling section 180 has a first refrigerant passage 181 through which a refrigerant flows within the first support section 170. Various components provided on the first support section 170 are cooled by the refrigerant passing through the first refrigerant passage 181.

[0040] <First Power Conversion Circuit> The inverter of the first power conversion circuit 130 has a first smoothing capacitor 300 and a first switch circuit 400. The first smoothing capacitor 300 has a lower heat resistance temperature than the first switch circuit 400.

[0041] The first smoothing capacitor 300 has an eleventh capacitance section 310, a twelfth capacitance section 320, an eleventh capacitor busbar 330, and a twelfth capacitor busbar 340. The first switch circuit 400 has an eleventh power conversion section 410 and a twelfth power conversion section 420. These eleventh power conversion section 410 and the twelfth power conversion section 420 have a high-side switch 701 and a low-side switch 702 connected in series.

[0042] <First smoothing capacitor> The 11th capacitor busbar 330 and the 12th capacitor busbar 340 included in the first smoothing capacitor 300 are responsible for the electrical current path of the first power conversion circuit 130. The 11th capacitor busbar 330 has an 11th power supply connection part 331, an 11th electrode connection part 332, and an 11th power connection part 333. The 12th capacitor busbar 340 has a 12th power supply connection part 341, a 12th electrode connection part 342, and a 12th power connection part 343.

[0043] The first P busbar 111 is connected to the 11th power connection section 331. The first N busbar 112 is connected to the 12th power connection section 341. The 11th electrode connection section 332 is connected to the first electrode 301 of the 11th capacitance section 310 and the 12th capacitance section 320. The 12th electrode connection section 342 is connected to the second electrode 302 of the 11th capacitance section 310 and the 12th capacitance section 320.

[0044] As a result, the first P busbar 111 is electrically connected to the first electrode 301 of the 11th capacitance section 310 and the 12th capacitance section 320. The first N busbar 112 is electrically connected to the second electrode 302 of the 11th capacitance section 310 and the 12th capacitance section 320. The 11th capacitance section 310 and the 12th capacitance section 320 are electrically connected in parallel between the first P busbar 111 and the first N busbar 112. The 11th capacitance section 310 and the 12th capacitance section 320 smooth the current supplied from the battery 20.

[0045] The 11th power connection section 333 is connected to the high-side switch 701 included in the 11th power conversion section 410 and the 12th power conversion section 420. The 12th power connection section 343 is connected to the low-side switch 702 included in the 11th power conversion section 410 and the 12th power conversion section 420.

[0046] As a result, the first P busbar 111 is electrically connected to the high-side switch 701 of the 11th power conversion unit 410 and the 12th power conversion unit 420. The first N busbar 112 is electrically connected to the low-side switch 702 of the 11th power conversion unit 410 and the 12th power conversion unit 420. The 11th power conversion unit 410 and the 12th power conversion unit 420 are electrically connected in parallel between the first P busbar 111 and the first N busbar 112.

[0047] The first smoothing capacitor 300 has a first capacitor housing 350. The first capacitor housing 350 is made of an insulating resin material. The first capacitor housing 350 is fixed to the first support portion 170.

[0048] The first capacitor housing 350 houses the entirety of the 11th capacitance section 310 and the 12th capacitance section 320, as well as parts of the 11th capacitor busbar 330 and the 12th capacitor busbar 340. The 11th electrode connection section 332 of the 11th capacitor busbar 330 and the 12th electrode connection section 342 of the 12th capacitor busbar 340 are housed in the first capacitor housing 350. The 11th power supply connection section 331 and the 11th power connection section 333 of the 11th capacitor busbar 330, and the 12th power supply connection section 341 and the 12th power connection section 343 of the 12th capacitor busbar 340 are exposed from the first capacitor housing 350.

[0049] <First switch circuit> The 11th power conversion unit 410 has an 11th U-phase leg 411, an 11th V-phase leg 412, and an 11th W-phase leg 413. The 12th power conversion unit 420 has a 12th U-phase leg 421, a 12th V-phase leg 422, and a 12th W-phase leg 423.

[0050] These six phase legs are equipped with the high-side switch 701 and low-side switch 702 described above. The six phase legs are also equipped with the high-side diode 703 and low-side diode 704.

[0051] In this embodiment, N-channel MOSFETs are used as the high-side switch 701 and the low-side switch 702. As shown in Figure 1, the source electrode of the high-side switch 701 and the drain electrode of the low-side switch 702 are connected. This connects the high-side switch 701 and the low-side switch 702 in series.

[0052] Furthermore, the cathode electrode of the high-side diode 703 is connected to the drain electrode of the high-side switch 701. The anode electrode of the high-side diode 703 is connected to the source electrode of the high-side switch 701. As a result, the high-side diode 703 is connected in antiparallel to the high-side switch 701.

[0053] Similarly, the cathode electrode of the low-side diode 704 is connected to the drain electrode of the low-side switch 702. The anode electrode of the low-side diode 704 is connected to the source electrode of the low-side switch 702. As a result, the low-side diode 704 is connected in antiparallel to the low-side switch 702.

[0054] The first switch circuit 400 has an eleventh switch case 430 and a twelfth switch case 440. The eleventh switch case 430 and the twelfth switch case 440 are made of insulating resin material. The three phase legs included in the eleventh power conversion unit 410 are housed in the eleventh switch case 430. The three phase legs included in the twelfth power conversion unit 420 are housed in the twelfth switch case 440. The eleventh switch case 430 and the twelfth switch case 440 are fixed to the first support unit 170. Of course, it is also possible to adopt a configuration in which the switches and diodes of the three phase legs are housed individually in other switch cases.

[0055] From the 11th switch case 430 and the 12th switch case 440, the drain terminal 710 connected to the drain electrode of the high-side switch 701 and the output terminal 720 connected to the midpoint between the high-side switch 701 and the low-side switch 702 are exposed. From the 11th switch case 430 and the 12th switch case 440, the source terminal 730 connected to the source electrode of the low-side switch 702 and the gate terminal 740 connected to the gate electrodes of the high-side switch 701 and the low-side switch 702 are exposed.

[0056] As shown in Figure 1, the drain terminal 710 is connected to the 11th power connection 333 of the 11th capacitor busbar 330. The source terminal 730 is connected to the 12th power connection 343 of the 12th capacitor busbar 340. Through these electrical connections, the high-side switch 701 and the low-side switch 702 are connected in series sequentially from the 11th capacitor busbar 330 to the 12th capacitor busbar 340. The high-side switch 701 and the low-side switch 702 are electrically connected in series between the first P busbar 111 and the first N busbar 112.

[0057] The first output unit 160 has the following first phase busbars: the 11U phase busbar 161, the 11V phase busbar 162, the 11W phase busbar 163, the 12U phase busbar 164, the 12V phase busbar 165, and the 12W phase busbar 166.

[0058] Furthermore, the first output unit 160 has an eleventh terminal block 167 and a twelfth terminal block 168. The eleventh terminal block 167 and the twelfth terminal block 168 are made of insulating resin material. The eleventh terminal block 167 houses the eleventh U-phase busbar 161, the eleventh V-phase busbar 162, and the eleventh W-phase busbar 163. The twelfth terminal block 168 houses the twelfth U-phase busbar 164, the twelfth V-phase busbar 165, and the twelfth W-phase busbar 166.

[0059] The 11U-phase busbar 161 is connected to the output terminal 720 of the 11U-phase leg 411. The 11V-phase busbar 162 is connected to the output terminal 720 of the 11V-phase leg 412. The 11W-phase busbar 163 is connected to the output terminal 720 of the 11W-phase leg 413. The 12U-phase busbar 164 is connected to the output terminal 720 of the 12U-phase leg 421. The 12V-phase busbar 165 is connected to the output terminal 720 of the 12V-phase leg 422. The 12W-phase busbar 166 is connected to the output terminal 720 of the 12W-phase leg 423.

[0060] The first motor 41 has the first phase stator coils described above: a first U-phase stator coil 43, a first V-phase stator coil 44, and a first W-phase stator coil 45.

[0061] An 11th U-phase busbar 161 is electrically connected to one end of the 1st U-phase stator coil 43. A 12th U-phase busbar 164 is electrically connected to the other end of the 1st U-phase stator coil 43. As a result, the output terminal 720 of the 11th U-phase leg 411 and the output terminal 720 of the 12th U-phase leg 421 are electrically connected via the 1st U-phase stator coil 43.

[0062] An 11th V-phase busbar 162 is electrically connected to one end of the 1st V-phase stator coil 44. A 12th V-phase busbar 165 is electrically connected to the other end of the 1st V-phase stator coil 44. As a result, the output terminal 720 of the 11th V-phase leg 412 and the output terminal 720 of the 12th V-phase leg 422 are electrically connected via the 1st V-phase stator coil 44.

[0063] An 11th W-phase busbar 163 is electrically connected to one end of the 1st W-phase stator coil 45. A 12th W-phase busbar 166 is electrically connected to the other end of the 1st W-phase stator coil 45. As a result, the output terminal 720 of the 11th W-phase leg 413 and the output terminal 720 of the 12th W-phase leg 423 are electrically connected via the 1st W-phase stator coil 45.

[0064] As described above, the 11th power conversion unit 410 and the 12th power conversion unit 420 are electrically connected via the first phase stator coil of the first motor 41. The first switch circuit 400 and the first motor 41 are electrically connected.

[0065] The first drive board 150 described above includes an eleventh drive board 151 and a twelfth drive board 152. The gate terminals 740 of the high-side switch 701 and low-side switch 702 included in the eleventh U-phase leg 411 to the eleventh W-phase leg 413 are connected to the gate driver of the eleventh drive board 151. The gate terminals 740 of the high-side switch 701 and low-side switch 702 included in the twelfth U-phase leg 421 to the twelfth W-phase leg 423 are connected to the gate driver of the twelfth drive board 152. The eleventh drive board 151 is shown as DR1-1 in the drawing. The twelfth drive board 152 is shown as DR1-2 in the drawing.

[0066] <Second Power Converter> Next, the second power converter 200 will be described. The main functional differences between the second power converter 200 and the first power converter 100 are that the input DC power is different for the first DC power and the second DC power, and that the controlled object is different for the first motor 41 and the second motor 42. Although the names of the components of the second power converter 200 and the first power converter 100 are different, there are no particular differences in their functions. Therefore, in the following, the description of the second power converter 200 will be simplified compared to the description of the first power converter 100.

[0067] The second power converter 200 includes a second power connector 210, a second filter 220, a second power conversion circuit 230, a second control board 240, a second drive board 250, a second output unit 260, and a second support unit 270.

[0068] The first power conversion circuit 130 and the second power conversion circuit 230 correspond to power conversion circuits. The first support part 170 and the second support part 270 correspond to support parts.

[0069] The second power connector 210 has a second P busbar 211 and a second N busbar 212. The second wire harness 22 is connected to this second power connector 210. The second P busbar 211 and the second N busbar 212 are electrically connected to the battery 20 via the second wire harness 22.

[0070] As shown in Figure 1, the first wire harness 21 and the second wire harness 22 are connected on the battery 20 side. These branch off into two at some point. One of the two branches corresponds to the first wire harness 21, and the other corresponds to the second wire harness 22. These first wire harness 21 and second wire harness 22 are located outside the housing 50.

[0071] The second P busbar 211 and the second N busbar 212 are connected to the second power conversion circuit 230. This connects the second power conversion circuit 230 to the battery 20 via the second wire harness 22, the second P busbar 211, and the second N busbar 212. Second DC power is supplied individually from the battery 20 to the second power conversion circuit 230.

[0072] The second filter 220 has a second capacitor 221 and a second resistor 222. The second capacitor 221 and the second resistor 222 are connected in series between the second P busbar 211 and the second N busbar 212.

[0073] The inverter of the second power conversion circuit 230 is connected to the second P busbar 211 and the second N busbar 212. The inverter of the second power conversion circuit 230 is connected to the second phase stator coil of the second motor 42 via the second phase busbar of the second output unit 260.

[0074] The second control board 240 has a second MGECU, which is one of several ECUs. The second control board 240 is shown as MGECU2 in the drawing. The gate driver of the second drive board 250 amplifies the control signal input from the second MGECU and outputs it to the inverter of the second power conversion circuit 230.

[0075] When the second motor 42 is operating, the inverter switch is PWM controlled by the output of the control signal from the second MGECU. As a result, the second DC power is converted to AC power in the second power conversion circuit 230. This AC power is input to the second phase stator coil of the second motor 42 as the second drive power.

[0076] The second support section 270 is provided with a second power connector 210, a second filter 220, a second power conversion circuit 230, a second control board 240, a second drive board 250, and a second output unit 260.

[0077] A second cooling section 280 is formed in the second support section 270. The second cooling section 280 has a second refrigerant passage 281 through which refrigerant passes within the second support section 270. Various components provided in the second support section 270 are cooled by the refrigerant passing through the second refrigerant passage 281. The first cooling section 180 and the second cooling section 280 correspond to the cooling section. The first refrigerant passage 181 and the second refrigerant passage 281 correspond to the refrigerant passage.

[0078] <Second Power Conversion Circuit> The inverter of the second power conversion circuit 230 has a second smoothing capacitor 500 and a second switch circuit 600. The second smoothing capacitor 500 has a lower heat resistance temperature than the second switch circuit 600. The first switch circuit 400 and the second switch circuit 600 correspond to switch circuits. The first smoothing capacitor 300 and the second smoothing capacitor 500 correspond to passive elements.

[0079] The second smoothing capacitor 500 has a 21st capacitance section 510, a 22nd capacitance section 520, a 21st capacitor busbar 530, and a 22nd capacitor busbar 540. The second switch circuit 600 has a 21st power conversion section 610 and a 22nd power conversion section 620. These 21st power conversion section 610 and 22nd power conversion section 620 have a high-side switch 701 and a low-side switch 702 connected in series.

[0080] <Second smoothing capacitor> The 21st capacitor busbar 530 has a 21st power supply connection section 531, a 21st electrode connection section 532, and a 21st power connection section 533. The 22nd capacitor busbar 540 has a 22nd power supply connection section 541, a 22nd electrode connection section 542, and a 22nd power connection section 543.

[0081] The second P busbar 211 is connected to the 21st power connection section 531. The second N busbar 212 is connected to the 22nd power connection section 541. The 21st electrode connection section 532 is connected to the 21st capacitance section 510 and the 3rd electrode 501 of the 22nd capacitance section 520. The 22nd electrode connection section 542 is connected to the 21st capacitance section 510 and the 4th electrode 502 of the 22nd capacitance section 520.

[0082] As a result, the second P busbar 211 is electrically connected to the third electrode 501 of the 21st capacitance section 510 and the 22nd capacitance section 520. The second N busbar 212 is electrically connected to the fourth electrode 502 of the 21st capacitance section 510 and the 22nd capacitance section 520. The 21st capacitance section 510 and the 22nd capacitance section 520 are electrically connected in parallel between the second P busbar 211 and the second N busbar 212. The 21st capacitance section 510 and the 22nd capacitance section 520 smooth the current supplied from the battery 20.

[0083] The 21st power connection 533 is connected to the 21st power conversion unit 610 and the high-side switch 701 included in the 22nd power conversion unit 620. The 22nd power connection 543 is connected to the 21st power conversion unit 610 and the low-side switch 702 included in the 22nd power conversion unit 620.

[0084] As a result, the second P busbar 211 is electrically connected to the high-side switch 701 of the 21st power conversion unit 610 and the 22nd power conversion unit 620. The second N busbar 212 is electrically connected to the low-side switch 702 of the 21st power conversion unit 610 and the 22nd power conversion unit 620. The 21st power conversion unit 610 and the 22nd power conversion unit 620 are electrically connected in parallel between the second P busbar 211 and the second N busbar 212. The high-side switch 701 and the low-side switch 702 are electrically connected in series between the second P busbar 211 and the second N busbar 212.

[0085] The second smoothing capacitor 500 has a second capacitor housing 550. The second capacitor housing 550 is made of an insulating resin material. The second capacitor housing 550 is fixed to the second support portion 270.

[0086] The second capacitor housing 550 houses the entirety of the 21st capacitance section 510 and the 22nd capacitance section 520, as well as parts of the 21st capacitor busbar 530 and the 22nd capacitor busbar 540. The 21st electrode connection section 532 of the 21st capacitor busbar 530 and the 22nd electrode connection section 542 of the 22nd capacitor busbar 540 are housed in the second capacitor housing 550. The 21st power supply connection section 531 and the 21st power connection section 533 of the 21st capacitor busbar 530, and the 22nd power supply connection section 541 and the 22nd power connection section 543 of the 22nd capacitor busbar 540 are exposed from the second capacitor housing 550.

[0087] <Second switch circuit> The 21st power conversion unit 610 has a 21st U-phase leg 611, a 21st V-phase leg 612, and a 21st W-phase leg 613. The 22nd power conversion unit 620 has a 22nd U-phase leg 621, a 22nd V-phase leg 622, and a 22nd W-phase leg 623.

[0088] The second switch circuit 600 has a 21st switch case 630 and a 22nd switch case 640. The 21st switch case 630 and the 22nd switch case 640 are made of an insulating resin material. The three phase legs included in the 21st power conversion unit 610 are housed in the 21st switch case 630. The three phase legs included in the 22nd power conversion unit 620 are housed in the 22nd switch case 640. The 21st switch case 630 and the 22nd switch case 640 are fixed to the second support unit 270. The drain terminal 710, output terminal 720, source terminal 730, and gate terminal 740 are exposed from the 21st switch case 630 and the 22nd switch case 640.

[0089] As shown in Figure 1, the drain terminal 710 is connected to the 21st power connection 533 of the 21st capacitor busbar 530. The source terminal 730 is connected to the 22nd power connection 543 of the 22nd capacitor busbar 540. Due to these electrical connections, the high-side switch 701 and the low-side switch 702 are connected in series sequentially from the 21st capacitor busbar 530 to the 22nd capacitor busbar 540.

[0090] The second output unit 260 has the following second phase busbars: the 21st U-phase busbar 261, the 21st V-phase busbar 262, the 21st W-phase busbar 263, the 22nd U-phase busbar 264, the 22nd V-phase busbar 265, and the 22nd W-phase busbar 266.

[0091] Furthermore, the second output unit 260 has a 21st terminal block 267 and a 22nd terminal block 268. The 21st terminal block 267 and the 22nd terminal block 268 are made of insulating resin material. The 21st terminal block 267 houses the 21st U-phase busbar 261, the 21st V-phase busbar 262, and the 21st W-phase busbar 263. The 22nd terminal block 268 houses the 22nd U-phase busbar 264, the 22nd V-phase busbar 265, and the 22nd W-phase busbar 266.

[0092] The 21st U-phase busbar 261 is connected to output terminal 720 of the 21st U-phase leg 611. The 21st V-phase busbar 262 is connected to output terminal 720 of the 21st V-phase leg 612. The 21st W-phase busbar 263 is connected to output terminal 720 of the 21st W-phase leg 613. The 22nd U-phase busbar 264 is connected to output terminal 720 of the 22nd U-phase leg 621. The 22nd V-phase busbar 265 is connected to output terminal 720 of the 22nd V-phase leg 622. The 22nd W-phase busbar 266 is connected to output terminal 720 of the 22nd W-phase leg 623.

[0093] The second motor 42 has the second phase stator coils described above: a second U-phase stator coil 46, a second V-phase stator coil 47, and a second W-phase stator coil 48.

[0094] A 21st U-phase busbar 261 is electrically connected to one end of the 2nd U-phase stator coil 46, and a 22nd U-phase busbar 264 is electrically connected to the other end. As a result, the 21st U-phase leg 611 and the 22nd U-phase leg 621 are electrically connected via the 2nd U-phase stator coil 46.

[0095] A 21st V-phase busbar 262 is electrically connected to one end of the 2nd V-phase stator coil 47, and a 22nd V-phase busbar 265 is electrically connected to the other end. As a result, the 21st V-phase leg 612 and the 22nd V-phase leg 622 are electrically connected via the 2nd V-phase stator coil 47.

[0096] A 21stW phase busbar 263 is electrically connected to one end of the 2ndW phase stator coil 48, and a 22ndW phase busbar 266 is electrically connected to the other end. As a result, the 21stW phase leg 613 and the 22ndW phase leg 623 are electrically connected via the 2ndW phase stator coil 48.

[0097] As described above, the 21st power conversion unit 610 and the 22nd power conversion unit 620 are electrically connected via the second phase stator coil of the second motor 42. The second switch circuit 600 and the second motor 42 are electrically connected.

[0098] The second drive board 250 described above includes a 21st drive board 251 and a 22nd drive board 252. The gate terminals 740 of the 21st U-phase legs 611 to 21st W-phase legs 613 are connected to the 21st drive board 251. The gate terminals 740 of the 22nd U-phase legs 621 to 22nd W-phase legs 623 are connected to the 22nd drive board 252. The 21st drive board 251 is shown as DR2-1 in the drawing. The 22nd drive board 252 is shown as DR2-2 in the drawing.

[0099] The type of switch element included in the phase leg described above is not particularly limited; for example, IGBTs can be used. The semiconductor elements such as switches and diodes included in the phase leg can be manufactured from semiconductors such as Si and wide-bandgap semiconductors such as SiC. The constituent materials of the semiconductor elements are not particularly limited.

[0100] Furthermore, the number of high-side switches 701 and low-side switches 702 in a phase leg is not limited to one. At least one of multiple phase legs may have multiple high-side switches 701 connected in parallel. At least one of multiple phase legs may have multiple low-side switches 702 connected in parallel. The number of switches connected in parallel can be determined based on the rated current of the switches and the amount of current that can be energized required for the power converter 30.

[0101] <Motor-driven> The first motor 41 and the second motor 42 can be driven by open-connection drive. Open-connection drive is sometimes referred to as H drive. To perform this H drive, the first control board 140 controls the first switch circuit 400 so that a neutral point is not formed in the first U-phase stator coil 43, the first V-phase stator coil 44, and the first W-phase stator coil 45. The second control board 240 controls the second switch circuit 600 so that a neutral point is not formed in the second U-phase stator coil 46, the second V-phase stator coil 47, and the second W-phase stator coil 48.

[0102] <Housing> As described above, the power converter 30 and the motor 40 are housed in the housing 50. This constitutes the electromechanical integrated device 60.

[0103] The housing 50 is made of a metal material such as aluminum or iron. As shown in Figures 2 to 4, the housing 50 has an inverter housing 51 and a motor housing 52. The power converter 30 is housed in the inverter housing 51. The motor 40 is housed in the motor housing 52.

[0104] The inverter housing 51 and the motor housing 52 are integrally connected. The inverter housing 51 and the motor housing 52 are aligned in the Z direction. The inverter housing 51 is positioned vertically above the motor housing 52. The motor housing 52 is fixed to the electric vehicle.

[0105] <Inverter Housing> The inverter housing 51 has an upper cover 53 and an upper case 54. The upper cover 53 and the upper case 54 are aligned in the Z direction. The upper cover 53 and the upper case 54 constitute the inverter space in which the power converter 30 is housed.

[0106] The upper cover 53 has a top plate 801 and cover side walls 802. The top plate 801 has a flat shape with a thin thickness in the Z direction. The cover side walls 802 rise up from the top plate 801 and extend in the Z direction. The cover side walls 802 form an annular shape around the Z direction.

[0107] The upper case 54 has an upper bottom portion 803 and an upper side wall 804. The upper bottom portion 803 is integrally connected to the motor housing 52. The location on the motor housing 52 where the upper bottom portion 803 is integrally connected is not shaped to align with a plane perpendicular to the Z direction. Therefore, the upper bottom portion 803 is also not shaped to align with a plane perpendicular to the Z direction. The upper side wall 804 rises from the upper bottom portion 803. The upper side wall 804 extends in the Z direction so as to move away from the motor housing 52. The upper side wall 804 forms an annular shape around the Z direction.

[0108] The top plate 801 and the upper bottom portion 803 are separated in the Z direction and facing each other. One of the cover side wall 802 and the upper side wall 804 extends toward the other in the Z direction. The leading edge of the cover side wall 802 and the leading edge of the upper side wall 804 are close together and facing each other in the Z direction. In this state, the upper cover 53 and the upper case 54 are connected. The inverter space is partitioned by the inner wall surfaces of the top plate 801, the upper bottom portion 803, the cover side wall 802, and the upper side wall 804. The power converter 30 is housed in this inverter space. The cover side wall 802 and the upper side wall 804 correspond to the side walls.

[0109] <Motor Housing> The motor housing 52 has a cylindrical portion 811 and a base 812. The outer wall surface of the cylindrical portion 811 has a curved shape that bends around the X direction. The outer wall surface of the cylindrical portion 811 has a roughly arc shape around the X direction. The upper bottom portion 803 of the upper case 54 is integrally connected to the upper part of the outer wall surface of the cylindrical portion 811 in the vertical direction. The base 812 is integrally connected to the lower part of the outer wall surface of the cylindrical portion 811 in the vertical direction. The base 812 is fixed to the electric vehicle.

[0110] The cylindrical portion 811 is open in the X direction. The first motor 41 and the second motor 42 are housed in the motor space inside this cylindrical portion 811. The motor space can be broadly divided into a first space where the first motor 41 is housed and a second space where the second motor 42 is housed. These first and second spaces are aligned in the X direction.

[0111] <Mechanical configuration of a power converter> Next, the mechanical configuration of the power converter 30 will be explained based on Figures 5 to 22. After explaining the mechanical configuration of the first power converter 100, the mechanical configuration of the second power converter 200 will be explained. However, the mechanical configurations of the first power converter 100 and the second power converter 200 are similar. Therefore, the explanation of the second power converter 200 will be simpler than the explanation of the first power converter 100.

[0112] Note that in Figure 11, the notation has been omitted to avoid complexity. The drawing corresponding to Figure 11 is equivalent to Figure 10 with the components of the inverter housing 51 removed, and the notations assigned to Figure 10 correspond to those in Figure 11.

[0113] <Mechanical configuration of the first power converter> <1st support part> For example, as shown in Figures 5, 12, and 15, the first support portion 170 has six faces. The first support portion 170 has a first surface 170a and a first back surface 170b, which are the largest of the six faces. The first surface 170a and the first back surface 170b are aligned in the Z direction.

[0114] The first support portion 170 has four remaining surfaces: a first inner surface 170c and a first outer surface 170d aligned in the X direction, and a first front surface 170e and a first rear surface 170f aligned in the Y direction. The first inner surface 170c and the first outer surface 170d extend more in the Y direction than in the Z direction. The first front surface 170e and the first rear surface 170f extend more in the X direction than in the Z direction.

[0115] The first rib 170g is integrally connected to the first inner surface 170c of the first support portion 170. A bolt is passed through this first rib 170g. The tip of this bolt is fastened to the inverter housing 51. In this way, the first support portion 170 is fixed to the inverter housing 51.

[0116] In addition to the first rib 170g, several other ribs are integrally connected to the first support section 170. In the drawing, the first rib 170g is shown as a representative of these multiple ribs. To avoid making the drawing complicated, some of the components of the power converter 30 have been omitted from the drawing, in addition to the rib shown here. Furthermore, the components have been simplified.

[0117] With the power converter 30 housed in the inverter housing 51, the first inner surface 170c is spaced further apart in the X direction than the first outer surface 170d, and further apart than the cover side wall 802 and the upper side wall 804. The first back surface 170b is located on the upper bottom 803 side of the first surface 170a in the Y direction. The first back surface 170b is located on the motor housing 52 side, and a portion of it is located in the projection area of ​​the motor housing 52 in the Z direction. The first support portion 170 is aligned with the first space in the Z direction.

[0118] With the power converter 30 mounted on the electric vehicle together with the housing 50, the first inner surface 170c is spaced further away from the left rear tire of the vehicle than the first outer surface 170d. The first inner surface 170c is located closer to the center of the vehicle in the X direction than the first outer surface 170d. The first front surface 170e is located closer to the front of the vehicle than the first rear surface 170f. The first front surface 170e is located closer to the center of the vehicle in the Y direction than the first rear surface 170f.

[0119] The first surface 170a is provided with a first power conversion circuit 130, a first control board 140, a first drive board 150, and a first output unit 160. The first back surface 170b is provided with a first power connector 110 and a first filter 120.

[0120] As shown in Figures 5 to 7, the first power conversion circuit 130 and the first output unit 160 are located on the first surface 170a side in the Z direction compared to the first control board 140 and the first drive board 150. The Z-direction position of the first drive board 150 is between the first power conversion circuit 130 and the first control board 140.

[0121] As described above, the inverter of the first power conversion circuit 130 has a first smoothing capacitor 300 and a first switch circuit 400. As shown in Figure 7, in the X direction, the first smoothing capacitor 300 is located on the first inner surface 170c side of the first outer surface 170d. The first output stage 160 is located on the first outer surface 170d side of the first inner surface 170c. The first switch circuit 400 is located between the first smoothing capacitor 300 and the first output stage 160. The first smoothing capacitor 300 and the first output stage 160 are aligned via the first switch circuit 400.

[0122] Thus, in the X direction, the first smoothing capacitor 300, the first switch circuit 400, and the first output unit 160 are arranged in order from the first inner surface 170c to the first outer surface 170d. This arrangement is equivalent to the arrangement of the first smoothing capacitor 300, the first switch circuit 400, and the first output unit 160 in the power supply path from the first power connector 110 to the first motor 41.

[0123] As shown in Figure 8, the positions of the 11th capacitance section 310 and the 12th capacitance section 320 of the first smoothing capacitor 300 are equivalent in the X direction. As shown in Figures 17 and 18, the 11th capacitance section 310 and the 12th capacitance section 320 are spaced apart in the Y direction.

[0124] As described above, the 11th capacitance section 310 and the 12th capacitance section 320 each have a first electrode 301 and a second electrode 302. The first electrode 301 and the second electrode 302 of the 11th capacitance section 310 are spaced apart in the X direction. The first electrode 301 and the second electrode 302 of the 12th capacitance section 320 are spaced apart in the X direction.

[0125] The two first electrodes 301 are positioned at the same location in the X direction and spaced apart in the Y direction. The two second electrodes 302 are positioned at the same location in the X direction and spaced apart in the Y direction. The two first electrodes 301 are positioned closer to the first inner surface 170c in the X direction than the two second electrodes 302.

[0126] As shown in Figures 19 to 22, the 11th capacitor busbar 330 has an 11th power supply connection part 331, an 11th electrode connection part 332, and an 11th power connection part 333, as well as an 11th base part 334. The 11th base part 334 extends in the Y direction. In the Y direction, the 11th base part 334 is located between the first capacitor housing 350 and the first switch circuit 400.

[0127] As shown in Figures 20 and 21, the 11th power supply connection section 331 extends from the 11th base section 334 in the Y direction between the 11th capacitance section 310 and the 12th capacitance section 320. The 11th power supply connection section 331 is connected to one of the first P busbar 111 and the first N busbar 112. As shown in Figure 10, the connection portion of the 11th power supply connection section 331 to one of the first P busbar 111 and the first N busbar 112 is located on the intermediate side between the first front surface 170e and the first rear surface 170f in the Y direction.

[0128] As shown in Figures 20 and 21, the 11th electrode connection portion 332 extends from the 11th base portion 334 in the Y direction toward the first electrodes 301 of the 11th capacitance portion 310 and the 12th capacitance portion 320. The 11th electrode connection portion 332 is connected to the two first electrodes 301.

[0129] As shown in Figure 19, six 11th power connection sections 333 are arranged in the Y direction. As shown in Figures 10 and 20, the 11th power connection sections 333 extend from the 11th base section 334 in the Y direction toward the 11th power converter section 410 and the 12th power converter section 420. The 11th power connection section 333 is connected to either the drain terminal 710 or the source terminal 730.

[0130] As shown in Figures 19 to 22, the 12th capacitor busbar 340 has a 12th power supply connection part 341, a 12th electrode connection part 342, and a 12th power connection part 343, as well as a 12th base part 344. The 12th base part 344 extends in the Y direction. As shown in Figure 10, the 12th base part 344 is located between the first capacitor housing 350 and the first switch circuit 400 in the Y direction. The 12th base part 344 and the 11th base part 334 are aligned in the Z direction with insulating paper in between.

[0131] As shown in Figures 20 and 22, the 12th power supply connection section 341 extends from the 12th base section 344 in the Y direction between the 11th capacitance section 310 and the 12th capacitance section 320. The 12th power supply connection section 341 is connected to the other end of the 1st P busbar 111 and the 1st N busbar 112.

[0132] As shown in Figures 20 and 22, the 12th electrode connection portion 342 extends from the 12th base portion 344 in the Y direction toward the second electrodes 302 of the 11th capacitance portion 310 and the 12th capacitance portion 320. The 12th electrode connection portion 342 is connected to the two second electrodes 302.

[0133] As shown in Figure 19, six 12th power connection sections 343 are arranged in the Y direction. As shown in Figures 10 and 20, the 12th power connection sections 343 extend from the 12th base section 344 in the Y direction toward the 11th power converter section 410 and the 12th power converter section 420. The 12th power connection sections 343 are connected to the drain terminal 710 and the other end of the source terminal 730.

[0134] As shown in Figures 5 to 11, a first notch 170h is formed on the central side in the Y direction of the first inner surface 170c of the first support portion 170. Therefore, the length of the first support portion 170 in the X direction is locally shortened.

[0135] The connection point between the 11th power supply connection section 331 and one of the 1st P busbar 111 and the 1st N busbar 112 is not located above the first surface 170a. The connection point between the 12th power supply connection section 341 and the other of the 1st P busbar 111 and the 1st N busbar 112 is not located above the first surface 170a. These are located in the first notch 170h. They are located between the 11th capacitance section 310 and the 12th capacitance section 320 in the Y direction. In the X direction, they are located between the first inner surface 350a and the first outer surface 350b of the first capacitor housing 350, which are aligned in the X direction. All of these projection regions in the Y direction are located in the first capacitor housing 350. In this embodiment, the length of these regions in the X direction is shorter than the distance between the first electrode 301 and the second electrode 302.

[0136] As shown in Figure 8, the positions of the 11th power conversion unit 410 and the 12th power conversion unit 420 of the first switch circuit 400 are the same in the X direction. The 11th power conversion unit 410 and the 12th power conversion unit 420 are spaced apart in the Y direction. The 11th switch case 430 and the 12th switch case 440 are spaced apart in the Y direction.

[0137] The 11th U-phase leg 411, the 11th V-phase leg 412, and the 11th W-phase leg 413 housed in the 11th switch case 430 are arranged in order in the Y direction from the first front 170e to the first rear 170f. The 12th U-phase leg 421, the 12th V-phase leg 422, and the 12th W-phase leg 423 housed in the 12th switch case 440 are arranged in order in the Y direction from the first front 170e to the first rear 170f. The 11th U-phase leg 411, the 11th V-phase leg 412, the 11th W-phase leg 413, the 12th U-phase leg 421, the 12th V-phase leg 422, and the 12th W-phase leg 423 are arranged in order in the Y direction from the first front 170e to the first rear 170f.

[0138] Due to this arrangement, the separation distances between the 11th U-phase leg 411 and the 12th U-phase leg 421, the separation distances between the 11th V-phase leg 412 and the 12th V-phase leg 422, and the separation distances between the 11th W-phase leg 413 and the 12th W-phase leg 423 are all equal.

[0139] The drain terminal 710 and source terminal 730 of the 11U-phase leg 411, the 11V-phase leg 412, and the 11W-phase leg 413 are located between the 11th switch case 430 and the first capacitor housing 350 in the X direction.

[0140] The drain terminals 710 and source terminals 730 of the 12U-phase leg 421, the 12V-phase leg 422, and the 12W-phase leg 423 are located in the X direction between the 12th switch case 440 and the first capacitor housing 350. The six drain terminals 710 and six source terminals 730 are arranged in the Y direction such that one of each set of drain terminals 710 is positioned between two of the other set of source terminals 730. The drain terminals 710 and source terminals 730 are arranged alternately in the Y direction.

[0141] Between the 11th switch case 430 and the first capacitor housing 350, and between the 12th switch case 440 and the first capacitor housing 350, six drain terminals 710 are individually connected to six 11th power connection sections 333. Six source terminals 730 are individually connected to six 12th power connection sections 343.

[0142] Due to this configuration, the energizing path lengths between identical phase legs of the 11th power conversion unit 410 and the 12th power conversion unit 420 via the drain terminal 710 are equal. The energizing path lengths between the 11th U phase leg 411 and the 12th U phase leg 421, the energizing path lengths between the 11th V phase leg 412 and the 12th V phase leg 422, and the energizing path lengths between the 11th W phase leg 413 and the 12th W phase leg 423 via the drain terminal 710 are also equal.

[0143] The energizing path lengths between identical phase legs of the 11th power conversion unit 410 and the 12th power conversion unit 420 via the source terminal 730 are equal. The energizing path lengths between the 11th U phase leg 411 and the 12th U phase leg 421, the energizing path lengths between the 11th V phase leg 412 and the 12th V phase leg 422, and the energizing path lengths between the 11th W phase leg 413 and the 12th W phase leg 423 via the source terminal 730 are equal.

[0144] The output terminals 720 of the 11th U-phase leg 411, the 11th V-phase leg 412, and the 11th W-phase leg 413, which are housed in the 11th switch case 430, are located between the 11th switch case 430 and the 11th terminal block 167 in the X direction. The three output terminals 720 exposed from the 11th switch case 430 are aligned in the Y direction.

[0145] The output terminals 720 of the 12th U-phase leg 421, the 12th V-phase leg 422, and the 12th W-phase leg 423, housed in the 12th switch case 440, are located between the 12th switch case 440 and the 12th terminal block 168 in the X direction. The three output terminals 720 exposed from the 12th switch case 440 are aligned in the Y direction. The six output terminals 720 of the first switch circuit 400 are aligned in the Y direction.

[0146] As shown in Figure 8, the positions of the 11th terminal block 167 and the 12th terminal block 168 in the X direction are the same. The 11th terminal block 167 and the 12th terminal block 168 are spaced apart in the Y direction.

[0147] The 11th U-phase busbar 161, the 11th V-phase busbar 162, and the 11th W-phase busbar 163 of the 11th terminal block 167 are arranged in order in the Y direction from the first front surface 170e to the first rear surface 170f. The 12th U-phase busbar 164, the 12th V-phase busbar 165, and the 12th W-phase busbar 166 of the 12th terminal block 168 are arranged in order in the Y direction from the first front surface 170e to the first rear surface 170f. The 11th U-phase busbar 161, the 11th V-phase busbar 162, the 11th W-phase busbar 163, the 12th U-phase busbar 164, the 12th V-phase busbar 165, and the 12th W-phase busbar 166 are arranged in order in the Y direction from the first front surface 170e to the first rear surface 170f.

[0148] Due to this arrangement, the distances between the 11th U-phase busbar 161 and the 12th U-phase busbar 164, the distances between the 11th V-phase busbar 162 and the 12th V-phase busbar 165, and the distances between the 11th W-phase busbar 163 and the 12th W-phase busbar 166 are all equal.

[0149] In the configuration shown above, the phase legs and phase busbars are arranged in order in the X direction from the first inner surface 170c to the first outer surface 170d. The 11th U phase leg 411 and the 11th U phase busbar 161 are arranged in order. The 11th V phase leg 412 and the 11th V phase busbar 162 are arranged in order. The 11th W phase leg 413 and the 11th W phase busbar 163 are arranged in order. The 12th U phase leg 421 and the 12th U phase busbar 164 are arranged in order. The 12th V phase leg 422 and the 12th V phase busbar 165 are arranged in order. The 12th W phase leg 423 and the 12th W phase busbar 166 are arranged in order.

[0150] Between the 11th terminal block 167 and the 11th switch case 430, the 11th U-phase busbar 161, the 11th V-phase busbar 162, and the 11th W-phase busbar 163 are individually connected to three output terminals 720 exposed from the 11th switch case 430.

[0151] Between the 12th switch case 440 and the 12th terminal block 168, the 12th U-phase busbar 164, the 12th V-phase busbar 165, and the 12th W-phase busbar 166 are individually connected to the three output terminals 720 exposed from the 12th switch case 440.

[0152] The connection points between the 11U-phase busbar 161, the 11V-phase busbar 162, the 11W-phase busbar 163, the 12U-phase busbar 164, the 12V-phase busbar 165, and the 12W-phase busbar 166 and the first motor 41 are detached from the top of the first surface 170a. These six phase busbars are connected to the first phase stator coil.

[0153] As described above, the first drive board 150 has an eleventh drive board 151 and a twelfth drive board 152. As shown in Figures 6 and 7, the eleventh drive board 151 is aligned with the eleventh switch case 430 in the Z direction. The twelfth drive board 152 is aligned with the twelfth switch case 440 in the Z direction. And, as shown in Figures 5 to 7, the first control board 140 is aligned with the eleventh switch case 430 in the Z direction via the eleventh drive board 151.

[0154] As shown in Figures 12 and 15, the first power connector 110 is provided on the first back surface 170b. As shown in Figures 9 and 16, the first filter 120 is provided on the first back surface 170b. As shown in Figure 10, the first connecting portion 113 of the first power connector 110 to which the first wire harness 21 is connected is located on the first outer surface 170d side of the first inner surface 170c in the X direction. A part of the first connecting portion 113 is formed by the inverter housing 51. The portion of the first connecting portion 113 formed by the inverter housing 51 is located outside the projection area of ​​the first support portion 170 in the Z direction.

[0155] Furthermore, the first connecting portion 113 is located on the side of the first rear surface 170f rather than the first front surface 170e in the Y direction. The position of the first connecting portion 113 in the Y direction is on the side of the 12th power conversion unit 420 rather than the 11th power conversion unit 410. As shown in Figure 2, the first connecting portion 113 is spaced further apart from the first back surface 170b than from the first filter 120 in the Z direction. The first connecting portion 113 is spaced further apart from the 12th terminal block 168 in the Z direction.

[0156] As shown in Figure 9, the first filter 120 is located on the side of the first inner surface 170c rather than the first outer surface 170d in the X direction. The first filter 120 is located on the side of the first rear surface 170f rather than the first front surface 170e in the Y direction. The position of the first filter 120 in the Y direction is intermediate between the first front surface 170e and the first rear surface 170f rather than the first rear surface 170f. The position of the first filter 120 in the Y direction is closer to the 12th power conversion unit 420 than the 11th power conversion unit 410. The first power conversion circuit 130 is located in the projection region of the first filter 120 in the Z direction. The first filter 120 is aligned with the 12th U-phase leg 421 and the 12th capacitance unit 320 in the Z direction.

[0157] The first P busbar 111 and the first N busbar 112 extend from the first connecting section 113 toward the eleventh power connection section 331 and the twelfth power connection section 341. The first filter 120 is located on the extension line of the first P busbar 111 and the first N busbar 112. The first filter 120 is located on the straight line connecting the first connecting section 113 and the eleventh power connection section 331 and the twelfth power connection section 341.

[0158] With the configuration described above, first DC power is input to the first power connector 110 provided on the first back surface 170b of the first support section 170. This first DC power flows through the first P busbar 111 and the first N busbar 112 provided on the first back surface 170b. Then the first DC power flows through the 11th capacitor busbar 330 and the 12th capacitor busbar 340 provided on the first front surface 170a. This first DC power is converted into first AC drive power by the first switch circuit 400. This first drive power is supplied via the first output unit 160 to the first motor 41, which is housed in the motor housing 52 located below the inverter housing 51 in the vertical direction.

[0159] <1st cooling section> As schematically shown in Figures 12-14 and 16-18, the first support portion 170 has three main components: a first laminated portion 751, a second laminated portion 752, and a third laminated portion 753. The first laminated portion 751 and the third laminated portion 753 are aligned in the Z direction via the second laminated portion 752. The first laminated portion 751 and the second laminated portion 752 are connected via a sealing member, and the second laminated portion 752 and the third laminated portion 753 are connected via a sealing member. This constitutes a first refrigerant passage 181 inside the first support portion 170.

[0160] Due to this configuration, the component provided on the first support portion 170 and the first refrigerant passage 181 are arranged opposite each other in the Z direction. The first power conversion circuit 130 and the first refrigerant passage 181 are arranged opposite each other in the Z direction. Furthermore, when the first support portion 170 is provided on the inverter housing 51, the first refrigerant passage 181 is interposed between the first motor 41 and the component provided on the first surface 170a side of the first support portion 170. The first refrigerant passage 181 is interposed between the first motor 41 and the first power conversion circuit 130.

[0161] The first laminated section 751 has a first upper surface 751a and a first lower surface 751b aligned in the Z direction. The second laminated section 752 has a second upper surface 752a and a second lower surface 752b aligned in the Z direction. The third laminated section 753 has a third upper surface 753a and a third lower surface 753b aligned in the Z direction. The first lower surface 751b and the second lower surface 752b correspond to the first back surface 170b. The second upper surface 752a and the third upper surface 753a correspond to the first front surface 170a.

[0162] The first laminated section 751 and the second laminated section 752 are connected in such a manner that the first upper surface 751a and the second lower surface 752b face each other in the Z direction. The second laminated section 752 and the third laminated section 753 are connected in such a manner that the second upper surface 752a and the third lower surface 753b face each other in the Z direction.

[0163] The first upper surface 751a, the second lower surface 752b, and the third lower surface 753b are partially undulating in the Z direction. The first upper surface 751a and the second lower surface 752b are partially close to each other and facing each other. The second upper surface 752a and the third lower surface 753b are partially close to each other and facing each other. The first refrigerant passage 181 is partitioned by these three opposing surfaces.

[0164] The first laminated section 751 has through holes that penetrate the first upper surface 751a and the first lower surface 751b. The second laminated section 752 has through holes that penetrate the second upper surface 752a and the second lower surface 752b. The wall surfaces that partition these through holes also partition the first refrigerant passage 181. In addition, cooling pins 754 are provided at the location on the third lower surface 753b that partitions the first refrigerant passage 181 in order to increase the contact area with the refrigerant.

[0165] The first cooling section 180 has a first refrigerant passage 181, as well as a first inlet pipe 182 and a first outlet pipe 183 aligned in the X direction. As shown in Figure 12, the first inlet pipe 182 and the first outlet pipe 183 are connected to the first refrigerant passage 181. As shown by the dashed line in Figures 10 and 11, the first refrigerant passage 181 extends in the Y direction, moving away from the first inlet pipe 182, then folds back and extends toward the first outlet pipe 183.

[0166] A pump (not shown) is connected to the first inlet pipe 182 and the first outlet pipe 183. The refrigerant flowing from the first inlet pipe 182 into the first refrigerant passage 181 exchanges heat with the components of the first power conversion circuit 130 housed in the first support section 170. This heat-exchanged refrigerant is returned to the pump via the first outlet pipe 183. The temperature of the refrigerant returned to the pump is lowered by a cooler such as a radiator. This cooled refrigerant is then supplied back to the first inlet pipe 182.

[0167] The first inlet pipe 182 and the first outlet pipe 183 are aligned in the X direction. The first inlet pipe 182 is located on the first outer surface 170d side of the first outlet pipe 183 in the X direction. The first outlet pipe 183 is located on the first inner surface 170c side of the first inlet pipe 182 in the X direction. The first inlet pipe 182 and the first outlet pipe 183 are located on the first rear surface 170f side of the first front surface 170e side of the first front surface 170f side of the first outlet pipe 183 in the Y direction.

[0168] The first refrigerant passage 181 can be broadly divided into the first upstream passage 184, the first connecting passage 185, and the first downstream passage 186. The first inlet pipe 182 is connected to the first upstream passage 184. The first connecting passage 185 connects the first upstream passage 184 and the first downstream passage 186. The first outlet pipe 183 is connected to the first downstream passage 186.

[0169] The first upstream passage 184 is located on the first outer surface 170d side of the first downstream passage 186 in the X direction. The first upstream passage 184 extends in the Y direction from the first inlet pipe 182 toward the first front surface 170e side. The first upstream passage 184 is aligned with the first switch circuit 400 in the Z direction.

[0170] The first connecting passage 185 is located in the Y direction on the first front surface 170e side of the first rear surface 170f. In the X direction, the first connecting passage 185 extends from the first upstream passage 184 toward the first inner surface 170c side.

[0171] The first downstream passage 186 is located on the first inner surface 170c side of the first upstream passage 184 in the X direction. The first downstream passage 186 extends in the Y direction from the first connecting passage 185 toward the first outflow pipe 183. The first downstream passage 186 is aligned with the first smoothing capacitor 300 in the Z direction.

[0172] In the direction of extension of the first refrigerant passage 181, the first switch circuit 400 is located on the first inlet pipe 182 side of the first refrigerant passage 181 than the first smoothing capacitor 300. The first switch circuit 400 is located upstream of the first refrigerant passage 181, and the first smoothing capacitor 300 is located downstream of the first refrigerant passage 181.

[0173] The refrigerant introduced into the first inlet pipe 182 flows sequentially through the first upstream passage 184, the first connecting passage 185, and the first downstream passage 186 before being discharged into the first outlet pipe 183. During this flow process, the refrigerant exchanges heat with the group of components provided in the first support section 170.

[0174] The refrigerant flowing through the first upstream passage 184 primarily exchanges heat with the first switch circuit 400. The refrigerant that has exchanged heat with the first switch circuit 400 flows through the first connecting passage 185 into the first downstream passage 186. The refrigerant flowing through the first downstream passage 186 primarily exchanges heat with the first smoothing condenser 300. Thus, in the direction of refrigerant flow in the first refrigerant passage 181, the first switch circuit 400 is located upstream of the first smoothing condenser 300.

[0175] As shown in Figure 13, the first filter 120 is aligned with the first upstream passage 184 and the first downstream passage 186 in the Z direction. Therefore, the first filter 120 is able to easily exchange heat with the refrigerant flowing through the first upstream passage 184 and the first downstream passage 186.

[0176] The 11th switch case 430 and the 12th switch case 440 of the first switch circuit 400 are pressed against the first support part 170 by bolts or the like. The first capacitor housing 350 is also pressed against the first support part 170 by bolts or the like. As a result, the 11th switch case 430, the 12th switch case 440, and the first capacitor housing 350 are able to actively conduct heat to the first support part 170.

[0177] <Mechanical configuration of the second power converter> <Second support part> The second support portion 270 has a second surface 270a and a second back surface 270b aligned in the Z direction, a second inner surface 270c and a second outer surface 270d aligned in the X direction, and a second front surface 270e and a second rear surface 270f aligned in the Y direction.

[0178] A bolt is passed through the second rib 270g of the second support portion 270. The tip of this bolt is fastened to the inverter housing 51, thereby fixing the second support portion 270 to the inverter housing 51.

[0179] With the power converter 30 housed in the inverter housing 51, the second inner surface 270c is spaced further apart in the X direction than the second outer surface 270d, and further apart than the cover side wall 802 and the upper side wall 804. The second back surface 270b is located in the Y direction further towards the upper bottom 803 and the motor housing 52 than the second surface 270a. A portion of the second back surface 270b is located in the projection area of ​​the motor housing 52 in the Z direction. The second support portion 270 is aligned with the second space in the Z direction.

[0180] With the power converter 30 mounted on the electric vehicle together with the housing 50, the second inner surface 270c is located further away from the rear tire on the right side of the vehicle than the second outer surface 270d, and is positioned towards the center of the vehicle in the X direction. The second front surface 270e is located towards the front of the vehicle than the second rear surface 270f, and is positioned towards the center of the vehicle in the Y direction.

[0181] The second surface 270a is provided with a second power conversion circuit 230, a second control board 240, a second drive board 250, and a second output unit 260, while the second back surface 270b is provided with a second power connector 210 and a second filter 220.

[0182] The second power conversion circuit 230 and the second output unit 260 are located on the second surface 270a side in the Z direction compared to the second control board 240 and the second drive board 250. The Z-direction position of the second drive board 250 is between the second power conversion circuit 230 and the second control board 240.

[0183] In the X direction, the second smoothing capacitor 500 is located on the second inner surface 270c side, and the second output stage 260 is located on the second outer surface 270d side. The second switch circuit 600 is located between the second smoothing capacitor 500 and the second output stage 260.

[0184] In the X direction, the second smoothing capacitor 500, the second switch circuit 600, and the second output unit 260 are arranged in order from the second inner surface 270c to the second outer surface 270d. This arrangement is equivalent to the arrangement of the second smoothing capacitor 500, the second switch circuit 600, and the second output unit 260 in the power supply path from the second power connector 210 to the second motor 42.

[0185] The 21st capacitance section 510 and the 22nd capacitance section 520 of the second smoothing capacitor 500 are at the same position in the X direction, but are spaced apart in the Y direction. The 3rd electrode 501 and the 4th electrode 502 of the 21st capacitance section 510 are spaced apart in the X direction, and the 3rd electrode 501 and the 4th electrode 502 of the 22nd capacitance section 520 are spaced apart in the X direction.

[0186] The two third electrodes 501 are positioned at the same location in the X direction and spaced apart in the Y direction. The two fourth electrodes 502 are positioned at the same location in the X direction and spaced apart in the Y direction. The third electrodes 501 are located closer to the second inner surface 270c in the X direction than the fourth electrodes 502.

[0187] The 21st capacitor busbar 530 has a 21st base 534. The 21st base 534 is located between the second capacitor housing 550 and the second switch circuit 600 in the Y direction and extends in the Y direction.

[0188] The 21st power connection section 531 extends from the 21st base section 534 in the Y direction between the 21st capacitance section 510 and the 22nd capacitance section 520, and is connected to one of the 2nd P busbar 211 and the 2nd N busbar 212. The connection portion of the 21st power connection section 531 with one of the 2nd P busbar 211 and the 2nd N busbar 212 is located on the intermediate side between the 2nd front surface 270e and the 2nd rear surface 270f in the Y direction.

[0189] The 21st electrode connection portion 532 extends from the 21st base portion 534 in the Y direction toward the two third electrodes 501 and is connected to them.

[0190] Six 21st power connection sections 533 are arranged in the Y direction. The 21st power connection sections 533 extend in the Y direction from the 21st base section 534 to the 21st power conversion section 610 side and the 22nd power conversion section 620 side, and are connected to one of the drain terminal 710 and the source terminal 730.

[0191] The 22nd capacitor busbar 540 has a 22nd base 544. The 22nd base 544 is located between the second capacitor housing 550 and the second switch circuit 600 in the Y direction and extends in the Y direction. The 22nd base 544 and the 21st base 534 are aligned in the Z direction with insulating paper in between.

[0192] The 22nd power connection section 541 extends from the 22nd base section 544 in the Y direction between the 21st capacitance section 510 and the 22nd capacitance section 520, and is connected to the other side of the 2nd P busbar 211 and the 2nd N busbar 212.

[0193] The 22nd electrode connection portion 542 extends from the 22nd base portion 544 in the Y direction toward the two 4th electrodes 502 and is connected to them.

[0194] Six 22nd power connection sections 543 are arranged in the Y direction. The 22nd power connection sections 543 extend from the 22nd base section 544 in the Y direction toward the 21st power conversion section 610 and the 22nd power conversion section 620, and are connected to the drain terminal 710 and the other side of the source terminal 730.

[0195] A second notch 270h is formed on the central side in the Y direction of the second inner surface 270c of the second support portion 270.

[0196] The connection point between the 21st power supply connection section 531 and one of the 2nd P busbar 211 and the 2nd N busbar 212 is not located above the second surface 270a. The connection point between the 22nd power supply connection section 541 and the other of the 2nd P busbar 211 and the 2nd N busbar 212 is not located above the second surface 270a. These are located in the second notch 270h. They are located between the 21st capacitance section 510 and the 22nd capacitance section 520 in the Y direction. In the X direction, they are located between the second inner surface 550a and the second outer surface 550b of the second capacitor housing 550, which are aligned in the X direction. All of these projection regions in the Y direction are located in the second capacitor housing 550. In this embodiment, the length of these regions in the X direction is shorter than the distance between the third electrode 501 and the fourth electrode 502.

[0197] The 21st power conversion unit 610 and the 22nd power conversion unit 620 are located at the same position in the X direction, and are spaced apart in the Y direction. The 21st switch case 630 and the 22nd switch case 640 are spaced apart in the Y direction.

[0198] The 21st U-phase leg 611, the 21st V-phase leg 612, and the 21st W-phase leg 613 housed in the 21st switch case 630 are aligned in the Y direction. The 22nd U-phase leg 621, the 22nd V-phase leg 622, and the 22nd W-phase leg 623 housed in the 22nd switch case 640 are aligned in the Y direction. The 21st U-phase leg 611, the 21st V-phase leg 612, the 21st W-phase leg 613, the 22nd U-phase leg 621, the 22nd V-phase leg 622, and the 22nd W-phase leg 623 are arranged in the Y direction from the second front 270e to the second rear 270f.

[0199] The separation distances between the 21st U-phase leg 611 and the 22nd U-phase leg 621, the separation distances between the 21st V-phase leg 612 and the 22nd V-phase leg 622, and the separation distances between the 21st W-phase leg 613 and the 22nd W-phase leg 623 are all equal.

[0200] The drain terminals 710 and source terminals 730 of the six phase legs described above are located in the X direction between the 21st switch case 630 and the 22nd switch case 640 and the second capacitor housing 550. The six drain terminals 710 and six source terminals 730 are arranged in the Y direction in an alternating manner in the Y direction.

[0201] The six drain terminals 710 are individually connected to the six 21st power connection sections 533, and the six source terminals 730 are individually connected to the six 22nd power connection sections 543.

[0202] The energizing path lengths between the same phase legs of the 21st power conversion unit 610 and the 22nd power conversion unit 620 via the drain terminal 710 are equal. The energizing path lengths between the same phase legs of the 21st power conversion unit 610 and the 22nd power conversion unit 620 via the source terminal 730 are equal.

[0203] In the X direction, three of the output terminals 720 of the six phase legs described above are located between the 21st switch case 630 and the 21st terminal block 267, and the remaining three are located between the 22nd switch case 640 and the 22nd terminal block 268. The output terminals 720 of the six phase legs are aligned in the Y direction.

[0204] Terminal block 21 267 and terminal block 22 268 are located at the same position in the X direction, and are spaced apart in the Y direction.

[0205] The 21st U-phase busbar 261, the 21st V-phase busbar 262, and the 21st W-phase busbar 263 of the 21st terminal block 267 are aligned in the Y direction. The 22nd U-phase busbar 264, the 22nd V-phase busbar 265, and the 22nd W-phase busbar 266 of the 22nd terminal block 268 are aligned in the Y direction. The 21st U-phase busbar 261, the 21st V-phase busbar 262, the 21st W-phase busbar 263, the 22nd U-phase busbar 264, the 22nd V-phase busbar 265, and the 22nd W-phase busbar 266 are arranged sequentially in the Y direction from the second front surface 270e to the second rear surface 270f.

[0206] The separation distances between the 21st U-phase busbar 261 and the 22nd U-phase busbar 264, the separation distances between the 21st V-phase busbar 262 and the 22nd V-phase busbar 265, and the separation distances between the 21st W-phase busbar 263 and the 22nd W-phase busbar 266 are all equal.

[0207] In the configuration shown above, the phase legs and phase busbars are arranged sequentially in the X direction from the second inner surface 270c to the second outer surface 270d. The 21st U-phase busbar 261, the 21st V-phase busbar 262, and the 21st W-phase busbar 263 are individually connected to three output terminals 720 exposed from the 21st switch case 630. The 22nd U-phase busbar 264, the 22nd V-phase busbar 265, and the 22nd W-phase busbar 266 are individually connected to three output terminals 720 exposed from the 22nd switch case 640.

[0208] The connection points between the 21st U-phase busbar 261, the 21st V-phase busbar 262, the 21st W-phase busbar 263, the 22nd U-phase busbar 264, the 22nd V-phase busbar 265, and the 22nd W-phase busbar 266 and the second motor 42 are detached from the upper part of the second surface 270a. These six phase busbars are connected to the second phase stator coil.

[0209] The 21st drive board 251 is aligned with the 21st switch case 630 in the Z direction. The 22nd drive board 252 is aligned with the 22nd switch case 640 in the Z direction. The 2nd control board 240 is aligned with the 22nd switch case 640 in the Z direction via the 22nd drive board 252.

[0210] The second power connector 210 and the second filter 220 are located on the second back surface 270b. The second connecting portion 213 of the second power connector 210, to which the second wire harness 22 is connected, is located on the second outer surface 270d side of the second inner surface 270c in the X direction. A portion of the second connecting portion 213 is formed by the inverter housing 51. The portion of the second connecting portion 213 formed by the inverter housing 51 is located outside the projection area of ​​the second support portion 270 in the Z direction.

[0211] Furthermore, the second connecting portion 213 is located on the second rear surface 270f side of the second front surface 270e in the Y direction. The position of the second connecting portion 213 in the Y direction is on the 22nd power conversion unit 620 side of the 21st power conversion unit 610. In the Z direction, the second connecting portion 213 is spaced further away from the second back surface 270b than from the second filter 220. In the Z direction, the second connecting portion 213 is spaced further away from the 22nd terminal block 268. A portion of the projection area of ​​the second power connector 210, including the second connecting portion 213, in the Z direction is located on the 22nd terminal block 268.

[0212] The second filter 220 is located on the side of the second inner surface 270c rather than the second outer surface 270d in the X direction. In the Y direction, the second filter 220 is located midway between the second front surface 270e and the second rear surface 270f rather than the second rear surface 270f. The position of the second filter 220 in the Y direction is on the side of the 22nd power conversion unit 620 rather than the 21st power conversion unit 610. The second power conversion circuit 230 is located in the projection region of the second filter 220 in the Z direction. In the Z direction, the second filter 220 is aligned with the 22nd U-phase leg 621 and the 22nd capacitance unit 520.

[0213] The second P busbar 211 and the second N busbar 212 extend from the second connecting section 213 toward the 21st power connection section 531 and the 22nd power connection section 541. The second filter 220 is located on the extension line of the second P busbar 211 and the second N busbar 212. The second filter 220 is located on the straight line connecting the second connecting section 213 and the 21st power connection section 531 and the 22nd power connection section 541.

[0214] With the configuration described above, the second DC power is input to the second power connector 210 provided on the second back surface 270b of the second support section 270. This second DC power flows through the second P busbar 211 and the second N busbar 212 provided on the second back surface 270b. Then the second DC power flows through the 21st capacitor busbar 530 and the 22nd capacitor busbar 540 provided on the second front surface 270a. This second DC power is converted into AC second drive power by the second switch circuit 600. This second drive power is supplied via the second output unit 260 to the second motor 42, which is located below the inverter housing 51 in the vertical direction.

[0215] <Second cooling section> The second support section 270, similar to the first support section 170, has a first laminated section 751, a second laminated section 752, and a third laminated section 753. The second refrigerant passage 281 is partitioned by these three laminated sections and the walls of the through holes formed in the laminated sections. The second refrigerant passage 281 is sealed by a sealing member. Cooling pins 754 are also provided on the walls that partition the second refrigerant passage 281.

[0216] The second cooling section 280 has a second inlet pipe 282 and a second outlet pipe 283 aligned in the X direction. The second inlet pipe 282 and the second outlet pipe 283 are connected to a second refrigerant passage 281. In the Y direction, the second refrigerant passage 281 extends away from the second inlet pipe 282, then folds back and extends toward the second outlet pipe 283. The first inlet pipe 182 and the second inlet pipe 282 correspond to inlet pipes. The first outlet pipe 183 and the second outlet pipe 283 correspond to outlet pipes.

[0217] The refrigerant flowing from the second inlet pipe 282 into the second refrigerant passage 281 exchanges heat with the components of the second power conversion circuit 230 housed in the second support section 270. This heat-exchanged refrigerant is returned to the pump via the second outlet pipe 283. The temperature of the refrigerant returned to the pump is lowered by a cooler. This lowered temperature refrigerant is then supplied to the second inlet pipe 282.

[0218] The second inlet pipe 282 is located on the second outer surface 270d side of the second outlet pipe 283 in the X direction. The second inlet pipe 282 and the second outlet pipe 283 are located on the second rear surface 270f side of the second front surface 270e in the Y direction.

[0219] The second refrigerant passage 281 is divided into a second upstream passage 284, a second connecting passage 285, and a second downstream passage 286. The second inlet pipe 282 is connected to the second upstream passage 284. The second connecting passage 285 connects the second upstream passage 284 and the second downstream passage 286. The second outlet pipe 283 is connected to the second downstream passage 286.

[0220] The second upstream passage 284 extends in the Y direction from the second inlet pipe 282 toward the second front surface 270e and is aligned with the second switch circuit 600 in the Z direction. The second connecting passage 285 is located toward the second front surface 270e than the second rear surface 270f in the Y direction and extends in the X direction from the second upstream passage 284 toward the second downstream passage 286. The second downstream passage 286 extends in the Y direction from the second connecting passage 285 toward the second outlet pipe 283 and is aligned with the second smoothing capacitor 500 in the Z direction.

[0221] In the direction of extension of the second refrigerant passage 281, the second switch circuit 600 is located on the second inlet pipe 282 side of the second refrigerant passage 281, relative to the second smoothing capacitor 500. The second switch circuit 600 is located upstream of the second refrigerant passage 281, and the second smoothing capacitor 500 is located downstream of the second refrigerant passage 281.

[0222] The refrigerant flowing through the second upstream passage 284 exchanges heat with the second switch circuit 600. The refrigerant that has exchanged heat with the second switch circuit 600 flows through the second connecting passage 285 into the second downstream passage 286. The refrigerant flowing through the second downstream passage 286 exchanges heat with the second smoothing condenser 500.

[0223] Furthermore, the second filter 220 is aligned with the second upstream passage 284 and the second downstream passage 286 in the Z direction. Therefore, the second filter 220 is able to easily exchange heat with the refrigerant flowing through the second upstream passage 284 and the second downstream passage 286.

[0224] The 21st switch case 630, the 22nd switch case 640, and the 2nd capacitor housing 550 are pressed against the 2nd support portion 270 by bolts or the like. This allows the 21st switch case 630, the 22nd switch case 640, and the 2nd capacitor housing 550 to actively conduct heat with the 2nd support portion 270.

[0225] <First power converter and second power converter> The first power converter 100 and the second power converter 200 are arranged side by side in the X direction. The first support part 170 and the second support part 270 are arranged side by side in the X direction. The first smoothing capacitor 300 and the second smoothing capacitor 500 are arranged next to each other in the X direction. With the first power converter 100 and the second power converter 200 housed in the inverter space of the inverter housing 51, the first smoothing capacitor 300 and the second smoothing capacitor 500 are located towards the center in the X direction of the inverter space. The first smoothing capacitor 300 and the second smoothing capacitor 500 are located between the first switch circuit 400 and the second switch circuit 600. The first smoothing capacitor 300 and the second smoothing capacitor 500 are spaced further apart from the cover side wall 802 and the upper side wall 804 of the inverter housing 51 in the X direction than the first switch circuit 400 and the second switch circuit 600. In contrast, the first output unit 160 and the second output unit 260 are located closer to the cover side wall 802 and the upper side wall 804 of the inverter housing 51 in the X direction than the first switch circuit 400 and the second switch circuit 600.

[0226] Furthermore, the first power connector 110, the first filter 120, the second power connector 210, and the second filter 220 are provided in the inverter housing 51 in an area outside the projection area of ​​the motor housing 52 in the Z direction. The motor 40 housed in the motor housing 52 is not facing the first power connector 110, the first filter 120, the second power connector 210, and the second filter 220 in the Z direction.

[0227] As shown in Figure 10, the positions of the first inlet pipe 182, the first outlet pipe 183, the second outlet pipe 283, and the second inlet pipe 282 are equivalent in the Y direction. Furthermore, as shown in Figures 3 and 12, the first inlet pipe 182, the first outlet pipe 183, the second outlet pipe 283, and the second inlet pipe 282 are arranged in order in the X direction. The first outlet pipe 183 and the second outlet pipe 283 are aligned between the first inlet pipe 182 and the second inlet pipe 282. The refrigerant that flows in the Y direction from the side away from the center in the X direction of the inverter space flows toward the center in the X direction of the inverter space, and then flows in the Y direction toward the center in the X direction of the inverter space.

[0228] <Effects and Effects> The first power conversion circuit 130 and the second power conversion circuit 230 control different objects. Therefore, it is assumed that the amount of heat generated by the energization will differ between them. The first cooling unit 180 is individually positioned opposite the first power conversion circuit 130. The second cooling unit 280 is individually positioned opposite the second power conversion circuit 230. As a result, the temperatures of the first power conversion circuit 130 and the second power conversion circuit 230, which generate different amounts of heat, are controlled individually.

[0229] A first refrigerant passage 181 is located between the first motor 41 and the first power conversion circuit 130. A second refrigerant passage 281 is located between the second motor 42 and the second power conversion circuit 230. This arrangement prevents the first power conversion circuit 130 from overheating due to the heat generated by the first motor 41, and prevents the second power conversion circuit 230 from overheating due to the heat generated by the second motor 42.

[0230] In the direction of refrigerant flow in the first refrigerant passage 181, the first switch circuit 400 is located upstream of the first smoothing capacitor 300. In the Z direction, the first switch circuit 400 is aligned with the first upstream passage 184, and the first smoothing capacitor 300 is aligned with the first downstream passage 186. Similarly, in the direction of refrigerant flow in the second refrigerant passage 281, the second switch circuit 600 is located upstream of the second smoothing capacitor 500. In the Z direction, the second switch circuit 600 is aligned with the second upstream passage 284, and the second smoothing capacitor 500 is aligned with the second downstream passage 286.

[0231] According to this, even if the amount of heat generated in the first switch circuit 400 and the second switch circuit 600 increases as a result of an increase in the number of switches included in the first switch circuit 400 and the second switch circuit 600, the temperature rise is effectively suppressed. Compared to a configuration in which the first smoothing capacitor 300 and the second smoothing capacitor 500 are located upstream in the direction of extension of the refrigerant passage, the temperature rise of the power converter 30 is suppressed.

[0232] The first inlet pipe 182, the first outlet pipe 183, the second outlet pipe 283, and the second inlet pipe 282 are in the same position in the Y direction and are arranged in order in the X direction.

[0233] Due to this configuration, the input and output locations for the refrigerant can be consolidated. The locations of the pumps that input and output refrigerant to the first cooling unit 180 and the second cooling unit 280 can be consolidated.

[0234] The first output unit 160 is provided on the first front surface 170a side, and the first power connector 110 is provided on the first back surface 170b side. The second output unit 260 is provided on the second front surface 270a side, and the second power connector 210 is provided on the second back surface 270b side. This ensures electrical insulation between the first power connector 110 and the second power connector 210 and the first output unit 160 and the second output unit 260.

[0235] Furthermore, this configuration suppresses the increase in the area of ​​the plane compared to a configuration in which the output unit and power connector are provided on the same surface. Specifically, the increase in the area of ​​the first surface 170a, the first back surface 170b, the second surface 270a, and the second back surface 270b is suppressed. The increase in the size of the first support part 170 and the second support part 270 in the direction perpendicular to the Z direction is suppressed. As a result, the increase in the size of the power converter 30 in the direction perpendicular to the Z direction is suppressed.

[0236] The housing 50 houses the first power conversion circuit 130 and the first motor 41, as well as the second power conversion circuit 230 and the second motor 42. The first power conversion circuit 130 and the second power conversion circuit 230 are electrically connected to a common battery 20. The first power conversion circuit 130 converts the first DC power supplied from the battery 20 into the first AC drive power and supplies it individually to the first motor 41. The second power conversion circuit 230 converts the second DC power supplied from the battery 20 into the second AC drive power and supplies it individually to the second motor 42.

[0237] According to this, increases in the energizing path length between the first power conversion circuit 130 and the first motor 41, and between the second power conversion circuit 230 and the second motor 42 are suppressed.

[0238] Furthermore, compared to a configuration where the first power conversion circuit 130 and the second power conversion circuit 230 output drive power to a common power device, the increase in the amount of current flowing through the electromechanical integrated device 60 is suppressed. The amount of heat generated due to the current is proportional to the square of the current. Therefore, the temperature rise of the electromechanical integrated device 60 is suppressed.

[0239] The first power conversion circuit 130 and the first motor 41 are aligned in the Z direction, and the second power conversion circuit 230 and the second motor 42 are aligned in the Z direction. This arrangement suppresses an increase in the length of the current path between the first power conversion circuit 130 and the first motor 41. It also suppresses an increase in the length of the current path between the second power conversion circuit 230 and the second motor 42.

[0240] The first power connector 110, the first filter 120, the second power connector 210, and the second filter 220 are provided outside the projection area of ​​the motor housing 52 in the Z direction of the inverter housing 51. This suppresses the increase in the Z-direction size of the integrated electromechanical device 60.

[0241] The first power connector 110 connects the battery 20 and the first power conversion circuit 130 individually. The second power connector 210 connects the battery 20 and the second power conversion circuit 230 individually.

[0242] According to this, the large current that flows from the battery 20 to the first power conversion circuit 130 and the second power conversion circuit 230 does not flow in the electromechanical unit 60. Therefore, the temperature rise of the electromechanical unit 60 is suppressed.

[0243] The first wire harness 21 and the second wire harness 22 are located outside the housing 50. This suppresses the temperature rise inside the housing 50.

[0244] The first power connector 110 is aligned with the first power conversion circuit 130 in the Z direction via the first support portion 170. The second power connector 210 is aligned with the second power conversion circuit 230 in the Z direction via the second support portion 270.

[0245] According to this, the increase in the size of the first support part 170 and the second support part 270 in the direction perpendicular to the Z direction is suppressed. The increase in the size of the power converter 30 in the direction perpendicular to the Z direction is suppressed.

[0246] The first power conversion circuit 130 is provided on the first surface 170a, and the first filter 120 is provided on the first back surface 170b. The second power conversion circuit 230 is provided on the second surface 270a, and the second filter 220 is provided on the second back surface 270b.

[0247] According to this, noise generated by the first motor 41 and the second motor 42 is more likely to be removed by the first filter 120 before it is input to the first power conversion circuit 130 provided on the first surface 170a. Noise generated by the first motor 41 and the second motor 42 is more likely to be removed by the second filter 220 before it is input to the second power conversion circuit 230 provided on the second surface 270a.

[0248] The first filter 120 is aligned with the first power conversion circuit 130 in the Z direction via the first support portion 170. The second filter 220 is aligned with the second power conversion circuit 230 in the Z direction via the second support portion 270. This suppresses an increase in the size of the power conversion device 30 in the direction perpendicular to the Z direction.

[0249] The first smoothing capacitor 300 and the second smoothing capacitor 500, which have lower heat resistance temperatures, are located closer to the center of the inverter space in the X direction than the first switch circuit 400 and the second switch circuit 600. The first smoothing capacitor 300 and the second smoothing capacitor 500 are spaced apart from the cover side wall 802 and the upper side wall 804 of the inverter housing 51 in the X direction.

[0250] As described above, the temperature rise in the inverter space is suppressed. Therefore, as described above, the first smoothing capacitor 300 and the second smoothing capacitor 500, which have lower heat resistance temperatures, can be placed on the central side in the X direction of the inverter space. As a result, malfunctions in the first smoothing capacitor 300 and the second smoothing capacitor 500 due to external forces on the inverter housing 51 are suppressed. Specifically, malfunctions in the first smoothing capacitor 300 and the second smoothing capacitor 500 due to external forces applied to the left and right sides of the electric vehicle are suppressed.

[0251] In the X direction, the first smoothing capacitor 300 and the first output stage 160 are aligned via the first switch circuit 400. In the X direction, the second smoothing capacitor 500 and the second output stage 260 are aligned via the second switch circuit 600.

[0252] Thus, the order of the smoothing capacitor, output unit, and switch circuit in the X direction is equivalent to the order of these three components in the current path from the battery 20 to the motor 40. The mechanical order in the X direction is equivalent to the order in the current path. Therefore, an increase in the length of the current path is suppressed.

[0253] The connection points between the 11th power supply connection section 331 and the 12th power supply connection section 341 and the 1st P busbar 111 and the 1st N busbar 112 are located between the 11th capacitance section 310 and the 12th capacitance section 320 in the Y direction. In the X direction, these are located between the first inner surface 350a and the first outer surface 350b of the first capacitor housing 350, which are aligned in the X direction, and the entire projection area in the Y direction is within the first capacitor housing 350. This suppresses an increase in the size of the first smoothing capacitor 300 in the X direction.

[0254] The connection points between the second P busbar 211 and the second N busbar 212 at the 21st power connection section 531 and the 22nd power connection section 541 are located between the 21st capacitance section 510 and the 22nd capacitance section 520 in the Y direction. In the X direction, these are located between the second inner surface 550a and the second outer surface 550b of the second capacitor housing 550, which are aligned in the X direction, and the entire projection area in the Y direction is within the second capacitor housing 550. This suppresses an increase in the size of the second smoothing capacitor 500 in the X direction.

[0255] <Variation> The disclosure in this specification is not limited to the exemplary embodiments. The disclosure includes the exemplary embodiments and modifications made by those skilled in the art based on those exemplary embodiments. The disclosure is not limited to the combinations of parts and elements shown in the embodiments, but can be implemented in various modifications. The disclosure can be implemented in a variety of combinations. The disclosure may have parts that can be added to the embodiments. The disclosure includes embodiments in which parts and elements have been omitted. The disclosure includes substitutions of parts, substitutions of elements, combinations of parts, or combinations of elements between one embodiment and another. The technical scope of the disclosure is not limited to the descriptions of the embodiments. The technical scope of the disclosure is indicated by the descriptions of the claims. The technical scope of the disclosure should be understood to include the equivalents of the descriptions of the claims and all modifications within the claims.

[0256] In this embodiment, an example of the application of the power converter 30 and the electromechanical integrated unit 60 to an electric vehicle was shown. However, the application of these power converter 30 and electromechanical integrated unit 60 is not limited to the above example. For example, they can be applied to various mobile devices such as hybrid vehicles, ships, and airplanes. Furthermore, they can be applied to industrial robots as long as no problems arise with their application, not just to such mobile devices. In addition, they can be broadly applied to other devices as long as no problems arise with their application, even without specific examples.

[0257] In this embodiment, as shown in Figure 1, an example is shown in which the first filter 120 and the second filter 220 have a resistor and a capacitor connected in series. However, as described above, when the power converter 30 and the electromechanical integrated device 60 are applied to the power source of various mobile devices, the applied voltage becomes high. Therefore, noise countermeasures must be enhanced. Consequently, the size and number of components of the first filter 120 and the second filter 220 increase.

[0258] The first filter 120 and the second filter 220 each have, in addition to a resistor and capacitor connected in series, at least one of two capacitors connected in series with their midpoints connected to ground, and a magnetic core surrounding the P busbar and N busbar. For this reason, as shown in Figures 9 and 14, for example, the size of the first filter 120 and the second filter 220 is large. To suppress the increase in the size of the power converter 30 due to this increase in size, the first filter 120 is provided on the first back surface 170b side of the first support portion 170 rather than the first front surface 170a side. The second filter 220 is provided on the second back surface 270b side of the second support portion 270 rather than the second front surface 270a side.

[0259] In this embodiment, an example is shown in which the motor 40 is provided in the motor housing 52. However, in addition to the motor 40, a reduction gear connecting the motor 40 and the axle may also be housed in the motor housing 52.

[0260] Specifically, the first motor 41 and the first reduction gear may be housed in the first space 811a. The second motor 42 and the second reduction gear may be housed in the second space 811b.

[0261] In order to make the shapes and number of components of the first power converter 100 and the second power converter 200 equivalent, they may be rotationally symmetrical. For example, they may be twice symmetrical.

[0262] An example was shown in which the first power converter 100 and the second power converter 200 have their own components. However, the first power converter 100 and the second power converter 200 may have common components. They may also share some of their components.

[0263] An example is shown in which the first power connector 110 has a first P busbar 111 and a first N busbar 112, and the second power connector 210 has a second P busbar 211 and a second N busbar 212. Each of these busbars may be integrally constructed from a single metal material, or it may be constructed by connecting multiple metal materials with connecting members such as bolts.

[0264] In the example shown, the first filter 120 has a first capacitor 121 and a first resistor 122 connected in series, and the second filter 220 has a second capacitor 221 and a second resistor 222 connected in series. However, the filter configuration is not limited to the above example.

[0265] An example has been shown in which the first control board 140 and the second control board 240 are separate components, and the first drive board 150 and the second drive board 250 are separate components. However, the first control board 140 and the second control board 240 may be combined into one. The first drive board 150 and the second drive board 250 may be combined into one. Furthermore, the first control board 140 and the first drive board 150 may be combined into one. The second control board 240 and the second drive board 250 may be combined into one.

[0266] An example was shown where the first support part 170 and the second support part 270 are separate components. However, they may be combined into a single unit.

[0267] An example was shown in which the first smoothing capacitor 300 has an eleventh capacitance section 310 and a twelfth capacitance section 320, and the second smoothing capacitor 500 has a twenty-first capacitance section 510 and a twenty-second capacitance section 520. However, the number of capacitance sections in a single smoothing capacitor can be one or three or more.

[0268] An example was shown in which the first electrode 301 and the second electrode 302 are spaced apart in the X direction, and the third electrode 501 and the fourth electrode 502 are spaced apart in the X direction. However, the first electrode 301 and the second electrode 302 may be spaced apart in the Z direction. The third electrode 501 and the fourth electrode 502 may also be spaced apart in the Z direction.

[0269] An example is shown in which a first notch portion 170h is formed in a first inner surface 170c of a first support portion 170, and a second notch portion 270h is formed in a second inner surface 270c of a second support portion 270. However, the formation position of the notch portion in the support portion is not particularly limited. A configuration in which no notch portion is formed in the support portion may also be adopted.

[0270] An example is shown in which the length in the X direction of the connection location between a first P bus bar 111 and a first N bus bar 112 in a first power connection portion 331 and a second power connection portion 341 is shorter than the separation distance between a first electrode 301 and a second electrode 302. However, these lengths in the X direction only need to be shorter than the separation distance between a first inner surface 350a and a first outer surface 350b.

[0271] An example is shown in which the length in the X direction of the connection location between a second P bus bar 211 and a second N bus bar 212 in a second power connection portion 531 and a second power connection portion 541 is shorter than the separation distance between a third electrode 501 and a fourth electrode 502. However, these lengths in the X direction only need to be shorter than the separation distance between a second inner surface 550a and a second outer surface 550b.

[0272] An example is shown in which cooling pins 754 are provided in a first cooling portion 180 and a second cooling portion 280. However, cooling pins 754 may be provided in one of these. Cooling pins 754 may not be provided in any of these.

[0273] An example is shown in which, in the X direction, a first inlet pipe 182 is located closer to a first outer surface 170d than a first outlet pipe 183, and a second inlet pipe 282 is located closer to a second outer surface 270d than a second outlet pipe 283. However, the first inlet pipe 182 may be located closer to a first inner surface 170c than the first outlet pipe 183. The second inlet pipe 282 may be located closer to a second inner surface 270c than the second outlet pipe 283.

[0274] In the example shown, the first switch circuit 400 is located upstream of the first smoothing capacitor 300 in the direction of extension of the first refrigerant passage 181. However, the first switch circuit 400 may also be located downstream of the first smoothing capacitor 300.

[0275] In the example shown, the second switch circuit 600 is located upstream of the second smoothing capacitor 500 in the direction of extension of the second refrigerant passage 281. However, the second switch circuit 600 may also be located downstream of the second smoothing capacitor 500.

[0276] An example was shown in which the first filter 120 is aligned with the first upstream passage 184 and the first downstream passage 186 in the Z direction, and the second filter 220 is aligned with the second upstream passage 284 and the second downstream passage 286 in the Z direction. However, the first filter 120 may be aligned with one of the first upstream passage 184 and the first downstream passage 186 in the Z direction, and the second filter 220 may be aligned with one of the second upstream passage 284 and the second downstream passage 286 in the Z direction. For example, the passive elements included in the first filter 120 may be aligned with the first downstream passage 186 in the Z direction, and the passive elements included in the second filter 220 may be aligned with the second downstream passage 286 in the Z direction. Passive elements include resistors, capacitors, reactors, etc.

[0277] An example was shown in which the first power converter 100 and the second power converter 200 are aligned in the X direction. However, it is also possible to adopt a configuration in which at least some of the components included in the first power converter 100 and at least some of the components included in the second power converter 200 are aligned in the Y direction.

[0278] An example is shown in which the first inlet pipe 182, the first outlet pipe 183, the second outlet pipe 283, and the second inlet pipe 282 are arranged in order in the X direction. However, the order of these in the X direction is not limited to this. For example, the first outlet pipe 183, the first inlet pipe 182, the second inlet pipe 282, and the second outlet pipe 283 may be arranged in order in the X direction.

[0279] <Disclosure of Technical Ideas> This specification discloses several technical concepts, as listed in the following paragraphs. Some paragraphs are written in a multiple dependent form, where subsequent paragraphs optionally refer to preceding paragraphs. Furthermore, some paragraphs are written in a multiple dependent form, referring to other multiple dependent forms. These paragraphs written in multiple dependent forms define several technical concepts. <Technical philosophy 1> Multiple power conversion circuits (130, 230) convert power supplied from a common power source (20) into driving power and supply the driving power individually to multiple different power devices (41, 42), A power conversion device having a plurality of power conversion circuits and a plurality of cooling units (180, 280) individually arranged opposite each other. <Technical philosophy 2> Each of the aforementioned power conversion circuits comprises a switch circuit (400, 600) including multiple switches, and a passive element (300, 500) having a lower heat resistance temperature than the switch circuit. Each of the cooling units comprises an inlet pipe (182, 282) through which refrigerant flows in, an outlet pipe (183, 283) through which refrigerant flows out, and a refrigerant passage (181, 281) connecting the inlet pipe and the outlet pipe. The power conversion device according to technical concept 1, wherein, in the direction of extension of the refrigerant passage, the switch circuit is located on the inlet pipe side of the refrigerant passage, relative to the passive element. <Technical philosophy 3> In the lateral direction, multiple cooling units are arranged in a row. In the vertical direction perpendicular to the horizontal direction, the refrigerant passage extends away from the inlet pipe, then folds back and extends toward the outlet pipe. The power conversion device according to technical concept 2, wherein, in the lateral direction, a plurality of inlet pipes are located between a plurality of outlet pipes. <Technical philosophy 4> It has a support section (170, 270) on which a plurality of the power conversion circuits are provided, and the support section is surrounded by annular side walls (802, 804), The passive element includes a smoothing capacitor that smooths the current supplied from the power supply. The power conversion device according to technical concept 2 or technical concept 3, wherein the smoothing capacitor is spaced further away from the side wall than the switch circuit. [Explanation of Symbols]

[0280] 20...Battery, 41...First motor, 42...Second motor, 50...Housing, 60...Mechatronics unit, 130...First power conversion circuit, 170...First support section, 180...First cooling section, 181...First refrigerant passage, 182...First inlet pipe, 183...First outlet pipe, 230...Second power conversion circuit, 270...Second support section, 280...Second cooling section, 281...Second refrigerant passage, 282...Second inlet pipe, 283...Second outlet pipe, 300...First smoothing capacitor, 400...First switch circuit, 500...Second smoothing capacitor, 600...Second switch circuit, 802...Cover side wall, 804...Upper side wall

Claims

1. Multiple power conversion circuits (130, 230) convert power supplied from a common power source (20) into driving power and supply the driving power individually to multiple different power devices (41, 42), A power conversion device having a plurality of power conversion circuits and a plurality of cooling units (180, 280) individually arranged opposite each other.

2. Each of the aforementioned power conversion circuits comprises a switch circuit (400, 600) including a plurality of switches, and a passive element (300, 500) having a lower heat resistance temperature than the switch circuit. Each of the cooling units comprises an inlet pipe (182, 282) through which refrigerant flows in, an outlet pipe (183, 283) through which refrigerant flows out, and a refrigerant passage (181, 281) connecting the inlet pipe and the outlet pipe. The power conversion device according to claim 1, wherein, in the direction of extension of the refrigerant passage, the switch circuit is located on the inlet pipe side of the refrigerant passage than the passive element.

3. In the lateral direction, multiple cooling units are arranged in a row. In the vertical direction perpendicular to the horizontal direction, the refrigerant passage extends away from the inlet pipe, then folds back and extends toward the outlet pipe. The power conversion device according to claim 2, wherein, in the lateral direction, a plurality of inlet pipes are located between a plurality of outlet pipes.

4. It has support sections (170, 270) on which multiple power conversion circuits are provided, and the support sections are surrounded by annular side walls (802, 804), The passive element includes a smoothing capacitor that smooths the current supplied from the power supply. The power conversion device according to claim 2 or 3, wherein the smoothing capacitor is spaced further away from the side wall than the switch circuit.

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