JP2021027727A - Electric power conversion device, electric power conversion device unit, and vehicle - Google Patents

Abstract

To provide an electric power conversion device that suppresses heat of an electronic component generating large heat from being conducted to an electronic component generating small heat and has increased reliability, an electric power conversion device unit, and a vehicle.SOLUTION: An electric power conversion device 30 comprises a circuit part 37, a conversion part 35 which converts an input voltage into an output voltage, and a case 36 which houses the circuit part and conversion part. The case has a first housing part 41 which house the circuit part where a first electronic component group 51 is arranged, a second housing part 42 which houses the conversion part where a second electronic component group 52 including a power element 31 is arranged, a coupling part 38 which couples the first housing part and second housing part, and an air channel part 39 which is located between the first housing part and second housing part.SELECTED DRAWING: Figure 2

Description

The present invention relates to a power converter, a power converter unit and a vehicle.

Vehicles such as electric motorcycles include a power conversion device that electrically connects a motor, which is a driving source for traveling, and a battery. The power converter converts the voltage of the battery into a voltage that meets the specifications of the motor.

For example, the power conversion device described in Patent Document 1 accommodates a first unit substrate on which a semiconductor element that generates a large amount of heat is mounted, a second unit substrate on which a semiconductor element that generates a small amount of heat is mounted, a capacitor, and the like. It is equipped with a metal case.

The first unit board comes into contact with the bottom surface of the case. The second unit substrate is fixed to the case at a predetermined distance from the first unit substrate in the plate thickness direction. The case is filled with fillers 73 and 74.

JP-A-2002-205610

In the case of the power conversion device disclosed in Patent Document 1, the heat generated from the semiconductor element that generates a large amount of heat mounted on the first unit substrate is easily transferred to the second unit substrate. When a large amount of heat is transferred, the semiconductor element having a small heat generation mounted on the second unit substrate is damaged by heat or its performance is deteriorated.

An object of the present invention is to suppress the heat of an electronic component having a large heat generation from being transferred to an electronic component having a small heat generation, and to provide a more reliable power conversion device, power conversion device unit and vehicle.

According to the first exemplary invention of the present invention, the power conversion device includes a circuit unit, a conversion unit that converts an input voltage into an output voltage, and a case that accommodates the circuit unit and the conversion unit. The case includes a first accommodating portion for accommodating the circuit unit in which the first electronic component group is arranged, and a second accommodating unit accommodating a conversion unit in which the second electronic component group including a power element is arranged. It has a connecting portion that connects the first accommodating portion and the second accommodating portion, and a wind cave portion located between the first accommodating portion and the second accommodating portion.

According to the present invention, it is possible to suppress the heat of an electronic component that generates a large amount of heat from being transferred to an electronic component that generates a small amount of heat. As a result, it is possible to suppress damage and performance deterioration of electronic components that generate less heat due to heat.

FIG. 1 is a schematic view of an electric motorcycle which is a vehicle equipped with the power conversion device according to the first embodiment. FIG. 2 is a cross-sectional view of the power conversion device according to the first embodiment. FIG. 3 is a cross-sectional view of the power conversion device according to the modified example of the first embodiment. FIG. 4 is a cross-sectional view of the power conversion device according to the second embodiment. FIG. 5 is a cross-sectional view of the power conversion device according to the third embodiment. FIG. 6 is a perspective view of the power conversion device according to the third embodiment. FIG. 7 is a cross-sectional view of a power conversion device unit including the power conversion device according to the first embodiment. FIG. 8 is a cross-sectional view of a power conversion device unit including a power conversion device according to a modification of the first embodiment.

<First Embodiment>
FIG. 1 is a schematic view of an electric motorcycle which is an electric vehicle equipped with the power conversion device according to the first embodiment.

As shown in FIG. 1, the electric motorcycle 10 includes a front wheel 11, a rear wheel 12, a vehicle body 13, a steering wheel 14, a throttle 15, a battery 16, a BMU (Battery Management Unit) 17, a motor 18, and the like. It includes a fan 19 and a power conversion device 30.

The front wheels 11 are attached to the lower front portion of the vehicle body 13, and the rear wheels 12 are attached to the lower rear portion of the vehicle body 13.

The handle 14 is attached to the front portion of the vehicle body 13. By operating the steering wheel 14, the steering angle of the front wheels 11 with respect to the vehicle body 13 is changed.

The throttle 15 is attached to the handle 14. When the throttle 15 is operated, an electric signal corresponding to the amount of operation is generated. An electric signal indicating the amount of operation of the throttle 15 is input to the power conversion device 30.

The battery 16 is charged from an external power source by connecting the charger 21. The battery 16 is mounted on, for example, the lower part of the vehicle body 13, the mounting portion 23 on the lower side of the step 22 located between the so-called front wheels 11 and the rear wheels 12.

The BMU 17 controls charging / discharging in the battery 16 from information such as the voltage and temperature of the battery 16. The BMU 17 suppresses overcharging and overdischarging of the battery 16. The BMU 17 is mounted on the mounting portion 23 on the lower side of the step 22. The BMU 17 and the battery 16 may be an integrated unit.

The power conversion device 30 converts the input voltage input from the battery 16 into an output voltage and outputs it to the motor 18. The power conversion device 30 adjusts the amount of electric power output to the motor 18 according to the amount of operation of the throttle 15. The power conversion device 30 is mounted in the rear part of the vehicle body 13, the lower space 25 of the seat 24 on which the operator of the so-called handle 14 is seated.

The motor 18 is driven by the electric power input from the power conversion device 30. The motor 18 is driven by the electric power input by the output voltage, and the rear wheels 12 are rotated by the driving force. The motor 18 is mounted on the lower part of the seat 24.

The fan 19 is attached to the vehicle body 13 and takes in outside air into the lower space 25 of the seat 24. Air is circulated in the lower space 25 by blowing air from the fan 19. The power conversion device 30 is provided at a position facing the fan 19. The air blown by the fan 19 directly hits the power conversion device 30.

The arrangement of the motor 18, the fan 19, and the power conversion device 30 in FIG. 1 is schematic, and the actual arrangement is not limited to this.

FIG. 2 is a cross-sectional view of the power conversion device according to the first embodiment. As shown in FIG. 2, the power conversion device 30 includes a circuit unit 37, a conversion unit 35, and a case 36. The conversion unit 35 converts the input voltage into the output voltage. The case 36 accommodates the circuit unit 37 and the conversion unit 35.

The case 36 has a first accommodating portion 41, a second accommodating portion 42, a connecting portion 38, and a wind tunnel portion 39. The first accommodating unit 41 accommodates the circuit unit 37. The second accommodating unit 42 accommodates the conversion unit 35. The first electronic component group 51 is arranged in the circuit unit 37.

The first electronic component group 51 is, for example, a semiconductor element, a resistor, a microcomputer, or the like having a small calorific value among the electronic components 50. The circuit unit 37 generates a PWM (Pulse Width Modulation) signal for driving the motor 18. The heat resistant temperature T1 of these electronic components is, for example, 105 degrees or 125 degrees.

A second group of electronic components 52 is arranged in the conversion unit 35. A second electronic component group 52 including a power element 31 is arranged in the conversion unit 35. In the present embodiment, the conversion unit 35 includes a power module 32 including a power element 31, a capacitor 33, and a power circuit unit 34 including a P bus bar, an N bus bar, and an insulating substrate holding them.

The power element 31 is a switching element, which converts the input direct current into a predetermined voltage and outputs it. The power element 31 is, for example, a power MOSFET or an insulated gate bipolar transistor (IGBT), and generates heat in the process of converting a voltage. The maximum operating temperature T2 (Max Operating Temperature) of the power element 31 is, for example, 150 degrees or 175 degrees.

The capacitor 33 is a smoothing capacitor, and outputs a constant voltage of direct current by repeating charging and discharging. The heat-resistant temperature Tc, which is the upper limit temperature at which the capacitor 33 can exhibit a predetermined performance, is lower than the maximum operating temperature T2, which is the upper limit temperature at which the power element 31 can exhibit a predetermined performance.

The power circuit unit 34, which is a laminated body including a P bus bar, an N bus bar, and an insulating substrate that holds them, connects a power module 32 including a power element 31 and a capacitor 33.

The conversion unit 35 converts the input voltage input from the battery 16 into the output voltage by the functions of the power module 32 including the power element 31, the capacitor 33, and the power circuit unit 34, respectively.

The connecting portion 38 connects the first accommodating portion 41 and the second accommodating portion 42. The connecting unit 38 accommodates a signal line 53 that connects the circuit unit 37 and the conversion unit 35. The inside and outside of the power conversion device 30 are partitioned by the first accommodating portion 41, the second accommodating portion 42, and the connecting portion 38. By accommodating the circuit unit 37 in the first accommodating unit 41, the conversion unit 35 in the second accommodating unit 42, and the signal line 53 in the connecting unit 38, the circuit unit 37, the conversion unit 35, and the signal line 53 become cases. It is housed in 36. As a result, the circuit unit 37, the conversion unit 35, and the signal line 53 are not exposed to rain or sand.

Since the second electronic component group 52 includes the power element 31, the calorific value of the second electronic component group 52 during operation is larger than the calorific value of the first electronic component group 51. Further, the maximum operating temperature T2 of the power element 31 of the second electronic component group 52 is higher than the heat resistant temperature T1 of the electronic component 50 constituting the first electronic component group 51.

In the present embodiment, as shown in FIG. 2, an electronic component (second electronic component group 52) that generates a large amount of heat and another electronic component (first electronic component group 51) are arranged apart from each other. Further, a wind tunnel portion 39 is located between the first accommodating portion 41 and the second accommodating portion 42. The wind tunnel portion 39 is a gap located between the first accommodating portion 41 and the second accommodating portion 42.
By providing the wind tunnel portion 39 between the electronic component having a large amount of heat generation and the other electronic component, the wind tunnel portion 39 serves as a heat insulating layer, and the heat of the second electronic component group 52 is transferred to the first electronic component group 51. Suppress that. As a result, it is possible to suppress damage and performance deterioration of the first electronic component group 51 due to heat. When the vehicle is running, the heat insulating effect can be enhanced by the wind passing through the wind tunnel portion 39. Further, the wind generated by the fan 19 passes through the wind tunnel portion 39, so that the heat insulating effect can be further enhanced.

As shown in FIG. 2, the first accommodating portion 41 is a first peripheral wall connecting a plate-shaped first wall portion 411, a plate-shaped second wall portion 412, a first wall portion 411, and a second wall portion 412. It has 413 and. The first wall portion 411 comes into contact with the circuit portion 37. The second wall portion 412 faces the second accommodating portion 42 and is parallel to the first wall portion 411. The first wall portion 411 has a convex portion 414 extending in a direction away from the first accommodating portion. The first peripheral wall 413 has a first side wall 413a, a second side wall (not shown), a third side wall 413c, and a fourth side wall 413d.

In the present embodiment, the direction in which the first wall portion 411 and the second wall portion 412 face each other is the Z direction, the direction in which the first side wall 413a and the third side wall 413c face each other is the X direction, and the second side wall and the fourth side wall The direction in which the 413d faces is defined as the Y direction, respectively. The X, Y, and Z directions are orthogonal to each other. The Z direction corresponds to the vertical direction.

The first wall portion 411 and the second wall portion 412 have a plate surface extending in the X direction and the Y direction. The first side wall 413a and the third side wall 413c have plate surfaces extending in the Y direction and the Z direction. The second side wall and the fourth side wall 413d have a plate surface extending in the X direction and the Z direction.

The power conversion device 30 is mounted in the lower space 25. More specifically, the power conversion device 30 is attached to the attachment portion 251 of the lower space 25. The mounting portion 251 faces downward. By fixing the power conversion device 30 via the convex portion 414, a wind tunnel portion is formed between the second wall portion 412 and the mounting portion 251, and the cooling performance of the circuit portion 37 in contact with the first wall portion 411 is formed. Is improved. The convex portion is, for example, a nut, a rubber bush, or the like.

The second accommodating portion 42 has a plate-shaped third wall portion 421, a plate-shaped fourth wall portion 422, and a second peripheral wall 423 connecting the third wall portion 421 and the fourth wall portion 422. The third wall portion 421 faces the first accommodating portion 41. The fourth wall portion 422 is parallel to the third wall portion 421. The fourth wall portion 422 has a first heat radiating portion 70. The second electronic component group 52 comes into contact with the first heat radiating unit 70. The second peripheral wall 423 has a fifth side wall 423a, a sixth side wall (not shown), a seventh side wall 423c, and an eighth side wall 423d.

The third wall portion 421 and the fourth wall portion 422 have a plate surface extending in the X direction and the Y direction. The fifth side wall 423a and the seventh side wall 423c have plate surfaces extending in the Y direction and the Z direction. The sixth side wall and the eighth side wall 423d have a plate surface extending in the X direction and the Z direction.

The case 36 is preferably made of resin. In other words, the first accommodating portion 41 and the second accommodating portion 42 are preferably made of resin. More specifically, it is preferable that the first wall portion 411 and the third wall portion 421 are made of resin. As a result, it is possible to suppress the heat generated in the second electronic component group 52 from being transferred to the first electronic component group 51.

The second wall portion 412 may be made of metal. As a result, the cooling performance of the circuit portion 37 in contact with the second wall portion 412 is further improved. The first accommodating portion 41 in the present embodiment has a mounting plate portion 411a extending in the X direction and the Y direction from the upper portion of the first peripheral wall 413, and the metal plate 411b is fixed to the mounting plate portion 411a. That is, the second wall portion 412 is formed by the mounting plate portion 411a and the metal plate 411b.

The first heat radiating unit 70 is, for example, a heat sink. The first heat radiating unit 70 is made of a material having a higher thermal conductivity than the case 36. The first heat radiating unit 70 is, for example, metal. As shown in FIG. 2, the heat sink has a base 71 and a plurality of heat radiation fins 72. The base 71 has a plate surface extending in the X and Y directions. The plurality of heat radiation fins 72 have plate surfaces extending in the Y direction and the Z direction, and extend downward from the base 71 in the Z direction. The power element 31 comes into contact with the base 71. When the vehicle is running or when the fan 19 is driven, the first heat radiating unit 70 is also exposed to the wind. Since the first heat radiating unit 70 is made of a material having a higher thermal conductivity than the case 36, the cooling efficiency of the first heat radiating unit 70 is higher than that of the case 36. By bringing the second electronic component group 52, which generates a larger amount of heat, into contact with the first heat radiating section 70 having high cooling efficiency, the cooling of the second electronic component group 52 is promoted, and the first accommodating section 41 is brought into the second. The heat transfer of the electronic component group 52 of the above is suppressed.

The connecting portion 38 connects the first accommodating portion 41 and the second accommodating portion 42. The connecting portion 38 is located between the first accommodating portion 41 and the second accommodating portion 42 and extends in the Z direction. The connecting portion 38 is a hollow cylinder or square cylinder. A signal line 53 is passed through the connecting portion 38. The signal line 53 electrically connects the conversion unit 35 and the circuit unit 37. The signal line 53 is, for example, a lead wire or a terminal pin.

In this embodiment, the capacitor 33 is arranged in the power circuit unit 34. That is, the second electronic component group 52 includes the capacitor 33. The fourth wall portion 422 has a second heat radiating portion 60. The second heat radiating unit 60 is a cap that covers the condenser 33. The second heat radiating unit 60 is made of a material having a higher thermal conductivity than the case 36. The second heat radiating unit 60 is, for example, metal.

FIG. 3 is a cross-sectional view of the power conversion device 130 in the modified example of the first embodiment. The points different from the first embodiment will be described with reference to FIG.

As shown in FIG. 3, the first peripheral wall 1413 of the first accommodating portion 141 and the second peripheral wall portion 1423 of the second accommodating portion 142 are connected to each other. More specifically, the first side wall 1413a and the fifth side wall 1423a are connected to form the first case side wall 361, and the third side wall 1413c and the seventh side wall 1423c are connected to form the second case side wall 362. The first opening (not shown) of the wind tunnel portion 139 is formed by the first case side wall 361, the second side wall (not shown), the second case side wall 362 and the sixth side wall (not shown). Further, the first case side wall 361, the fourth side wall 1413d, the second case side wall 362, and the eighth side wall 1423d form a second opening 392 of the wind tunnel portion 139. Thereby, the strength of the case 136 of the power conversion device 130 can be improved without impairing the heat insulating property of the wind tunnel portion 139.
<Second Embodiment>

FIG. 4 is a cross-sectional view of the power conversion device 230 according to the second embodiment. The points different from the first embodiment will be described with reference to FIG.

As shown in FIG. 4, the second wall portion and the third wall portion are connected to form the intermediate wall portion 40. The intermediate wall portion 40 is a plate surface extending in the X direction and the Y direction. The intermediate wall portion 40 has a wind tunnel portion 239 extending in the Y direction. The wind tunnel portion 239 has a first opening (not shown) and a second opening 2392 on the Y-direction end surface of the intermediate wall portion 40. The wind tunnel portion 239 is arranged above the power element 231. Thereby, the strength of the case 236 of the power conversion device 230 can be further improved without impairing the heat insulating property of the wind tunnel portion 239.
<Third Embodiment>

FIG. 5 is a cross-sectional view of the power conversion device 330 according to the third embodiment. FIG. 6 is a perspective view of the power conversion device 330 according to the third embodiment. As shown in FIGS. 5 and 6, the power conversion device 330 has a first heat radiation unit 370 and a second heat radiation unit 360 on the lower side. The points different from the first embodiment will be described with reference to FIGS. 5 and 6.

As shown in FIGS. 5 and 6, the first peripheral wall 3413 of the first accommodating portion 341 and the second peripheral wall 3423 of the second accommodating portion 342 are connected to each other. More specifically, the first side wall 3413a and the fifth side wall 3423a are connected to form the first case side wall 3361. The third side wall 3413c and the seventh side wall 3423c are connected to form the second case side wall 3362. The second side wall 3413b and the sixth side wall 3423b are connected to form the third case side wall 3363, and the fourth side wall 3413d and the eighth side wall 3423d are connected to form the fourth case side wall 3364.

The third case side wall 3363 has a first opening 3391, and the fourth case side wall 3364 has a second opening 3392. The first opening 3391 and the second opening 3392 are connected by a tubular portion 393. The tubular portion 393 is fixed by, for example, arranging the conversion portion in the case 336, fitting one end of the tubular portion 393 into the first opening 3391, and fitting the other end of the tubular portion 393 into the second opening 3392. After that, the first surface to which the circuit portion is attached is fitted into the case 336 with the circuit portion facing downward. In the embodiment of FIGS. 5 and 6, the upper side of the case 336 with respect to the tubular portion 393 is the first accommodating portion 341, and the lower side is the second accommodating portion 342.
<Power converter unit>

FIG. 7 is a cross-sectional view of the power conversion device unit 80 including the power conversion device 30 according to the first embodiment. The power conversion device unit 80 includes a power conversion device 30 and a fan 19. The fan 19 has an impeller 191. The power conversion device 30 is arranged to face the fan 19. FIG. 7 is a cross-sectional view of the power conversion device 30 as viewed from the X direction. The power conversion device 30 and the fan 19 are arranged in the Y direction. The first heat radiating unit 70 and the second heat radiating unit 60 are arranged in the X direction.

The fan 19 sends wind toward the power converter 30. The fan 19 is, for example, an axial fan and has an impeller 191. The impeller 191 extends in the Z direction. The wind tunnel portion 39 extends in the Y direction. The extending direction of the wind tunnel portion 39 intersects with the impeller 191. Since the wind is generated by the rotation of the impeller 191, the air volume is larger in the portion facing the impeller 191 than in the center of the fan 19. Therefore, by arranging the power conversion device 30 so that the extending direction of the wind tunnel portion 39 and the impeller 191 intersect, more wind flows through the wind tunnel portion 39, and the cooling effect can be enhanced. When the vehicle includes the power conversion device unit 80 as described above, a highly reliable vehicle can be provided.
<Modification example>

FIG. 8 is a cross-sectional view of the power conversion device unit 81 including the power conversion device 430 in the modified example of the first embodiment. As in this modification, the first heat radiating unit 470 and the second heat radiating unit 460 may be arranged in the Y direction.

The detailed shape of each member may be different from the shape shown in each figure of the present application. Further, the elements appearing in the above-described embodiments and modifications may be appropriately combined as long as there is no contradiction.

For example, the capacitor may be arranged in the circuit section. That is, the capacitor may be included in the first group of electronic components. Further, a voltage conversion device may be arranged on the intake side of the fan to suck out the air in the wind tunnel. As the fan, in addition to the axial fan, a centrifugal fan, a sirocco fan, or the like may be used.

In the above-described embodiment and modification, the X-direction, Y-direction, Z-direction, and vertical direction used in the description are merely used for the description, and do not limit the mounting posture on the electric motorcycle.

In the above-described embodiment and modification, the mounting target of the power conversion device is not limited to the electric motorcycle. An electric vehicle can be equipped with a power conversion device regardless of the number of wheels. Further, not limited to a vehicle, a power conversion device can be mounted on a propulsion body such as an air vehicle that moves by using a motor as a drive source.

The above embodiments and modifications may be combined with each other within a technically consistent range.

10 ... Electric motorcycle 11 ... Front wheel 12 ... Front wheel 13 ... Body 14 ... Handle 15 ... Throttle 16 ... Battery 17 ... BMU
18 ... Motor 19 ... Fan 191 ... Impeller 21 ... Charger 22 ... Step 23 ... Mounting part 24 ... Seat 25 ... Lower space 251 ... Mounting part 30 , 130, 230, 330, 430 ... Power converter 31, 131, 231, 331 ... Power element 32, 132, 232, 332 ... Power module 33, 133, 233, 333 ... Condenser 34 , 134, 234 ... Power circuit unit 35, 135, 235 ... Conversion unit 36, 136, 236, 336 ... Case 361, 3361 ... First case Side wall 362, 3362 ... Second case Side wall 3363 ... Third case Side wall 3364 ... Fourth case Side wall 37, 137, 237 ... Circuit part 38 ... Connecting part 39, 139, 239 ... Wind cave part 3391 ... First opening 392, 2392, 3392 ... 2nd opening 393 ... Cylinder 40 ... Intermediate wall 41, 141, 341 ... 1st accommodating 411 ... 1st wall 411a ... Mounting plate Part 411b ... Metal plate 412 ... Second wall part 413, 1413, 3413 ... First peripheral wall 413a, 1413a, 3413a ... First side wall 3413b ... Second side wall 413c, 1413c, 3413c ... .. 3rd side wall 413d, 1413d, 3413d ... 4th side wall 414 ... Convex portion 42, 142, 342 ... 2nd accommodating portion 421 ... 3rd wall portion 422 ... 4th wall portion 423, 1423, 3423 ... 2nd peripheral wall 423a, 3423a ... 5th side wall 3423b ... 6th side wall 423c, 3423c ... 7th side wall 423d, 3423d ... 8th side wall 50 ... Electron Parts 51 ... First electronic component group 52 ... Second electronic component group 53 ... Signal lines 60, 360, 460 ... Cap (second heat dissipation unit)
70, 370, 470 ... First heat dissipation unit 71 ... Base 72 ... Heat dissipation fins 80, 81 ... Power conversion device unit

Claims (10)

A power conversion device including a circuit unit, a conversion unit that converts an input voltage into an output voltage, and a case that houses the circuit unit and the conversion unit.
The case is
A first accommodating unit accommodating the circuit unit in which the first electronic component group is arranged, and
A second accommodating unit accommodating a conversion unit in which a second electronic component group including a power element is arranged,
A connecting portion that connects the first accommodating portion and the second accommodating portion,
A wind tunnel located between the first accommodating portion and the second accommodating portion,
Power converter with. The power conversion device according to claim 1, wherein the calorific value of the second electronic component group at the time of operation is larger than the calorific value of the first electronic component group. The power conversion device according to claim 1 or 2, wherein the maximum operating temperature of the power element is higher than the heat resistant temperature of the electronic components constituting the first electronic component group. The first housing unit
The first wall portion in contact with the circuit portion and
A second wall portion facing the second accommodating portion and parallel to the first wall portion,
Have,
The power conversion device according to any one of claims 1 to 3, wherein the first wall portion has a convex portion extending in a direction away from the first accommodating portion. The power conversion device according to claim 4, wherein the second wall portion is made of metal. The second accommodating part
A third wall portion facing the first accommodating portion and
The fourth wall part parallel to the third wall part and
Have,
The fourth wall portion has a first heat radiating portion having a higher thermal conductivity than the case.
The power conversion device according to any one of claims 1 to 5, wherein the second group of electronic components comes into contact with the first heat radiation unit. The second group of electronic components includes a capacitor.
The fourth wall portion has a second heat radiating portion having a higher thermal conductivity than the case.
The power conversion device according to claim 6, wherein the second heat radiating unit covers the capacitor. The power conversion device according to any one of claims 1 to 7, wherein the case is a resin. A power conversion device unit including the power conversion device according to any one of claims 1 to 8 and a fan.
The fan has an impeller
The power converter is arranged to face the fan.
A power converter unit in which the extending direction of the wind tunnel and the impeller intersect. A vehicle including the power conversion device unit according to claim 9.

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