JP2020167876A - Power converter - Google Patents

Abstract

To provide a power converter which can achieve efficient wiring and coupling in small space.SOLUTION: The power converter is provided with: a housing which has a coolant passage; a heat sink arranged in a bottom part of the housing; a power substrate arranged above the heat sink; a capacitor part 50 arranged above the power substrate; and an inverter control substrate 51 arranged above the capacitor part 50. The capacitor part 50 has: an inverter control substrate; an electrolytic capacitor mounted on the inverter control substrate; and a first direct current electrode module 80 mounted on the inverter control substrate in a position different from a position of the electrolytic capacitor. First and second electrode parts 19b and 20b which are a rod-like members for supplying DC power supplied to the power converter to the capacitor part 50 from a DC power input part provided in an upper part of the housing are extended from the first direct current electrode module 80, penetrate the control substrate 51, and reach the DC power input part.SELECTED DRAWING: Figure 7

Description

The present invention relates to a power converter.

Patent Document 1 discloses a structure that reduces the inductance of the connection portion of the DC terminal between the capacitor module of the power conversion device and the power semiconductor module. In Patent Document 1, a refrigerant flow path is formed along the outer periphery of the capacitor module, and a connection portion located at the tip of the DC terminal of the capacitor module is connected to a DC terminal in a laminated state of power semiconductor modules in a direction along the refrigerant flow path. Is connected by welding with a structure that sandwiches from both sides.

Japanese Unexamined Patent Publication No. 2011-217550

However, in the structure of Patent Document 1, since fastening and wiring with each component and connector are performed on the outside of various substrates of the power conversion device, the power conversion device becomes large in size.
Further, Patent Document 1 discloses a power conversion device attached to an electric vehicle or the like, but when the power conversion device is attached to a vehicle drive motor directly or via another member, the vehicle drive motor It does not disclose how to fasten with the three-phase terminal of. Further, when the vehicle drive motor and the power converter are fastened, it is necessary to fasten the thermista for detecting the temperature of the vehicle drive motor to the power converter, and to detect the rotation speed of the vehicle drive motor. It is also necessary to fasten the rotation angle detection sensor of the above to the power conversion device. Patent Document 1 does not disclose these conclusions either. Further, the arrangement of the internal parts of the power conversion device may be restricted by the arrangement of the surrounding parts and the like.

In view of the above problems, one of the objects of the present invention is to provide a power conversion device capable of realizing efficient wiring and fastening in a small space.

One aspect of the power conversion device of the present invention is a housing having a bottom portion, a side portion that stands up from the bottom portion, an upper portion that closes an upper opening of the side portion, and a refrigerant flow path provided at the bottom portion. And the power board housed in the housing and arranged at the bottom of the housing, the power board housed in the housing and arranged above the heat sink, and the power board housed in the housing. A power conversion device including a capacitor unit arranged above the capacitor unit and a control board housed in the housing and arranged above the capacitor unit. The capacitor unit includes the capacitor control board and the capacitor unit. It has an electrolytic capacitor mounted on a capacitor control board and a first DC electrode module mounted on the capacitor control board at a position different from that of the electrolytic capacitor, and DC supplied to the power conversion device. A rod-shaped member for supplying power from the DC power input unit provided in the upper part of the housing to the capacitor unit extends from the first DC electrode module and penetrates the control board to enter the DC power input. It leads to the department.

According to the power conversion device of the present invention, efficient wiring and fastening can be realized in a small space.

FIG. 1 is a front perspective view showing the appearance of the power conversion device according to the embodiment of the present invention. FIG. 2 is a rear perspective view of the power conversion device. FIG. 3 is a plan view of the power conversion device. FIG. 4 is a perspective view of the power conversion device as viewed from below. FIG. 5 shows a state in which the cover member of the DC input portion is removed from the state of FIG. FIG. 6 is a perspective view of the top cover. FIG. 7 is a perspective view showing a state in which the top cover is removed from the state of FIG. FIG. 8 shows a state similar to that of FIG. 7, but is a perspective view from a different direction. FIG. 9 is a perspective view showing a state in which the housing body is removed from the state of FIG. 7. FIG. 10 is a perspective view showing a state in which the housing body is removed from the state of FIG. FIG. 11 shows a state similar to that of FIG. 10, but is a perspective view seen from a direction different from that of FIG. FIG. 12 is a perspective view showing a state in which the inverter control board is removed from the state of FIG. FIG. 13 is a perspective view showing a state in which the connector module and the DC current sensor are removed from the state of FIG. FIG. 14 shows a state similar to that of FIG. 13, but is a perspective view seen from a direction different from that of FIG. FIG. 15 is a perspective view showing a state in which the motor sensor is removed from the state of FIG. FIG. 16 is a perspective view showing a state in which the capacitor portion and the flexible substrate are removed from the state of FIG. FIG. 17 shows a state similar to that of FIG. 16, but is a perspective view seen from a direction different from that of FIG. FIG. 18 is a perspective view showing a state in which the motor current sensor is removed from the state of FIG. FIG. 19 is a perspective view showing a state in which the three-phase terminal is removed from the state of FIG. FIG. 20 shows a state similar to that of FIG. 19, but is a perspective view seen from a direction different from that of FIG. FIG. 21 is a perspective view of the state of FIG. 19 as viewed from below. FIG. 22 is a perspective view of the heat sink. FIG. 23 is a perspective view of the first DC electrode module. FIG. 24 is a perspective view of the second DC electrode module. FIG. 25 is a perspective view of the housing body as viewed from above the left side surface. FIG. 26 is a perspective view of the housing body as viewed from above the right side surface. FIG. 27 is a perspective view of the connector module. FIG. 28 is a perspective view showing a state in which the three-phase terminal is removed from the state of FIG. 27. FIG. 29 is a perspective view of the module body. FIG. 30 is a developed perspective view of the internal parts of the power converter.

Hereinafter, the power conversion device (inverter device) according to the embodiment of the present invention will be described with reference to the drawings. The scope of the present invention is not limited to the following embodiments, and can be arbitrarily changed within the scope of the technical idea of the present invention. Further, in the following drawings, the scale and the number of each structure may be different from the scale and the number of the actual structure in order to make each configuration easy to understand.

In the drawings, the XYZ coordinate system is shown as a three-dimensional Cartesian coordinate system as appropriate. In the XYZ coordinate system, it is assumed that the Z-axis direction is the vertical direction and is the height direction of the inverter device in FIGS. 1 and 2. The X-axis direction is a direction orthogonal to the Z-axis direction. The X-axis direction is the width direction (horizontal direction) of the power conversion device 10 in FIGS. 1 and 2. The Y-axis direction is a direction orthogonal to both the X-axis direction and the Z-axis direction.

In the following description, the height direction (Z-axis direction) of the power converter is the vertical direction. The positive side (+ Z side) in the Z-axis direction with respect to a certain object may be called "upper side", and the negative side (-Z side) in the Z-axis direction with respect to a certain object is called "lower side". In some cases. The front-back direction, front side, and rear side are names used only for explanation, and do not limit the actual positional relationship and direction. In the present embodiment, the case where the −Z side is viewed from above (+ Z side) in the Z axis direction is referred to as the case where the view is viewed in a plan view.

FIG. 1 is a front perspective view showing the appearance of the power conversion device 10 of the present embodiment. The power converter 10 is arranged, for example, on one drive motor (not shown) in the engine compartment of an automobile.
As shown in FIG. 1, the power conversion device 10 has a top cover 12 and a housing body 14 in appearance. A signal connector (signal connector) 16 is attached to the right side surface 14a of the housing body 14. The signal connector 16 receives a signal from the vehicle. Further, on the right side surface 14a of the housing main body 14, an outlet opening 22b for introducing a refrigerant for cooling the power conversion device 10 into the power conversion device 10 is provided in the vicinity of the signal connector 16. The top cover 12 is provided on the housing main body 14, and the housing 18 of the power conversion device 10 is formed by the top cover 12 and the housing main body 14. The top cover 12 is fixed to the housing body 14 by bolts 20. The refrigerant is cooling water, cooling oil, or the like. The cooling water is, for example, LLC (Long Life Coolant).

The top cover 12 is provided with a first DC input unit 19 and a second DC input unit 20. For example, a direct current (for example, 48V) from an automobile battery (not shown) is input to the first DC input unit 19 and the second DC input unit. For example, the first DC input unit 19 becomes +, and the second DC input unit 20 becomes − (GND).
The first DC input unit 19 has a cover member 19a and a first electrode unit 19b. The cover member 19a is a member that surrounds the first electrode portion 19b. The second DC input unit 20 has a cover member 20a and a second electrode unit 20b. The cover member 20a is a member that surrounds the second electrode portion 20b. The cover members 19a and 20a are attached to the support plate 23. The support plate 23 is fixed to the top cover 12. The DC input units 19 and 20 may be referred to as DC connector units.
In FIG. 1, the Z direction is the height direction of the housing 18, the X direction is the width direction of the housing 18, and the Y direction is the length direction of the housing 18.

FIG. 2 is a rear perspective view of the power conversion device 10. FIG. 2 shows the left side surface, the back surface, and the upper surface of the power conversion device 10. The left side surface 14b of the housing body 14 is provided with an inlet opening 22a for a refrigerant (cooling water, cooling oil, etc.) for cooling the power conversion device 10. Reference numeral 14c indicates the back surface of the housing body 14.

FIG. 3 is a plan view of the power conversion device 10. FIG. 4 is a perspective view of the power conversion device 10 as viewed from below.
As shown in FIG. 4, the connector module mounting portion 29 extends downward from the bottom surface 14d of the housing body 14. The connector module 30 is attached to the connector module attachment portion 29. The connector module 30 is a component connected to a motor (not shown) located below the power converter 10. The structure of the connector module 30 will be described later with reference to FIGS. 27 to 29. The bottom surface 14d of the housing body 14 is also the bottom surface 24 of the housing 18. Since the entrance opening 22a is provided at the connection portion between the left side surface 14b of the housing body 14 and the bottom surface 14e, the entrance opening 22a is provided on the bottom surface 14e of the housing body 14 (bottom 24 of the housing 18). It can also be said that it is. Similarly, since the outlet opening 22b is provided at the connection portion between the right side surface 14a of the housing body 14 and the bottom surface 14e, the outlet opening 22b is the bottom surface 14e of the housing body 14 (bottom 24 of the housing 18). It can also be said that it is provided in.

FIG. 5 shows a state in which the cover members 19a and 20a are removed from the state of FIG. FIG. 6 is a perspective view of the top cover 12. FIG. 6 shows a state in which the support plate 23 is removed from the top cover 12. The top cover 12 has a substantially flat upper surface portion 12a, a first outer peripheral portion 12b extending obliquely downward from the upper surface portion 12a, and a second outer peripheral portion 12c extending downward from the first outer peripheral portion 12b. The upper surface portion 12a of the top cover 12 is provided with a convex portion 13 having a small height. The convex portion 13 is rectangular in a plan view. The convex portion 13 is provided with a first opening 25 through which the first electrode portion 19b passes and a second opening 26 through which the second electrode portion 20b passes.

FIG. 7 is a perspective view showing a state in which the top cover 12 of the power conversion device 10 is removed from the state of FIG. FIG. 8 shows the same state as that of FIG. 7, but is a perspective view from a different direction.
As shown in FIGS. 7 and 8, the inverter control board 51 has a rectangular shape in a plan view. The inverter control board 51 is supported from below by two first support members 81 and 82 of the first DC electrode module 80 on one side 51a of the rectangle. As will be described later with reference to FIG. 11, the first DC electrode module 80 is supported from below by two second support portions 91 and 92 on the rectangular facing sides 51b.
The inverter control board 51 has a transformer 54 substantially in the center of the upper surface thereof. The transformer 54 insulates the auxiliary power supply 12V circuit area (GND) from the motor drive 48V circuit area (GND) to create a control power supply. For example, the transformer 54 generates a control voltage for driving a microcomputer or the like from the auxiliary power supply 12V.
Further, the inverter control board 51 has an upper connector 55a on the right edge of the upper surface and a lower connector 55b on the right edge of the lower surface. When viewed in the Z direction, the lower connector 55b is located below the upper connector 55a. A cable 61 is connected to the lower connector 55b. The cable 61 extends from the lower connector 55b to the signal connector 16. The signal from the vehicle is received by the signal connector 16 and transmitted to the lower connector 55b via the cable 61. The lower connector 55b is a connector for sending the signal to the inside of the power conversion device 10. The cable 61 may be connected to the upper connector 55a. Whether the cable 61 is connected to the lower connector 55b or the upper connector 55a is determined in consideration of the clearance (gap) when the top cover 12 is attached to the housing body 14. Although two connectors (upper connector 55a and lower connector 55b) are shown in FIG. 7, only one connector may be provided on the inverter control board 51.
The inverter control board 51 has a first opening 52 and a second opening 53 at positions separated forward from the element 54 by a predetermined distance. The first electrode portion 19b extends downward through the first opening 52, and the second electrode portion 20b extends downward through the second opening 53.

A part of the connector module 30, an inverter control board 51, a capacitor portion 50, and a motor current sensor 40 are housed in the housing 18. The capacitor portion 50 is located below the control board 51 for the inverter circuit. The capacitor portion 50 is sometimes referred to as a film capacitor. The motor current sensor 40 is provided between the front surface 14d of the housing body 14 and the first support portions 81 and 82. The motor current sensor 40 is a rectangular parallelepiped-shaped component having a predetermined width in the Y direction.
The right side surface 14a of the housing body 14 has a shape of a substantially right triangle. The hypotenuse of the right triangle slopes downward from the back surface 14c toward the front surface 14d.
Although the power board 43 and the heat sink 70, which will be described later, are also housed in the housing 18, the power board 43 and the heat sink 70 are located below the capacitor portion 50.

FIG. 9 is a perspective view showing a state in which the housing main body 14 is removed from the state of FIG. 7. FIG. 10 is a perspective view showing a state in which the housing body 14 is removed from the state of FIG. FIG. 11 shows a state similar to that of FIG. 10, but is a perspective view seen from a direction different from that of FIG.
As shown in FIG. 9, the control board 59 of the capacitor portion 50 is provided with a plurality of notched portions 59a, 59b, 59c. The notch portion 59a is a notch portion for bolt fastening work. The cutout portion 59b is for preventing the cable 61 from coming out of the capacitor control board 59 in a plan view. The notch portion 59c is a notch portion for bolt fastening work. As will be described later, the capacitor control board 51 has a substantially rectangular shape in a plan view.

9 to 11 show a part of the power substrate 43 and the heat sink 70 located below the capacitor portion 50. The inverter control board 51 is slightly smaller than the capacitor section 50 in a plan view. Further, the capacitor portion 50 is slightly smaller than the power substrate 43 in a plan view. The connector module 30 is located slightly below the motor current sensor 40. The capacitor section 50 has a plurality of columnar electrolytic capacitors 57 and a capacitor control board 59 on which the electrolytic capacitors 57 are mounted. As shown in FIG. 11, a second DC electrode module 90 is provided on the power substrate 43. Details of the second DC electrode module 90 will be described later with reference to FIG. 24.

FIG. 12 is a perspective view showing a state in which the inverter control board 51 is removed from the state of FIG. Reference numeral 56 indicates a DC current sensor. Since the DC current sensor 56 is attached to the lower surface of the inverter control board 51, it is a component that is removed together with the inverter control board 51. However, since it was not shown in FIG. 10, it is shown in FIG. The DC current sensor 56 has a hole in the center, and the first electrode portion 19b passes through the hole.

FIG. 13 is a perspective view showing a state in which the connector module 30 and the DC current sensor 56 are removed from the state of FIG. FIG. 14 shows a state similar to that of FIG. 13, but is a perspective view seen from a direction different from that of FIG. FIG. 15 is a perspective view showing a state in which the motor current sensor 40 and the flexible substrate 58 are removed from the state of FIG. FIG. 16 is a perspective view showing a state in which the capacitor portion 50 and the flexible substrate 58 are removed from the state of FIG. Note that FIG. 16 shows a three-phase terminal 28 penetrating the motor current sensor 40. The three-phase terminal 28 includes a U-phase terminal 28a, a V-phase terminal 28b, and a W-phase terminal 28c. The three-phase terminal 28 can also be referred to as a motor bus bar. FIG. 17 shows a state similar to that of FIG. 16, but is a perspective view seen from a direction different from that of FIG. FIG. 18 is a perspective view showing a state in which the motor current sensor 40 is removed from the state of FIG. FIG. 19 is a perspective view showing a state in which the three-phase terminal 28 is removed from the state of FIG. FIG. 20 shows a state similar to that of FIG. 19, but is a perspective view seen from a direction different from that of FIG. FIG. 21 is a perspective view of the state of FIG. 19 as viewed from below. FIG. 22 is a perspective view showing a state in which the power substrate 43 is removed from the state of FIG. 19, and shows a heat sink 70.
The flexible board 58 transmits a drive signal of the three-phase inverter power element that drives the motor from the control board to the power board. Further, the flexible substrate 58 sends a voltage or current in the 48V area from the power substrate to the control substrate. Further, the flexible substrate 58 sends each of the three-phase current / voltage sensing signals for driving the motor to the control substrate.

As shown in FIGS. 12, 13 and 15, the first DC electrode module 80 is provided on the capacitor control board 59. FIG. 23 is a perspective view of the first DC electrode module 80. The first DC electrode module 80 has two columnar first support portions 81 and 82, and a connecting portion 83 connecting the first support portions 81 and 82 at the bottom.
The connecting portion 83 of the first DC electrode module 80 extends along one side 59a of the capacitor control board 59 and is connected to the first portion 84 extending from the one side 59a to the inside of the capacitor control board 59 and the second portion 84. It has a portion 85 and. The second portion 85 is located inside the capacitor control board 59 with respect to the first portion 84. The second portion 85 has an elliptical shape in a plan view, and the height of the second portion 85 is larger than the height of the first portion 84. The connecting portion 83 has four ends (first end 83a, second end 83b, third end 83c, fourth end 83d). The first portion 84 has a first end portion 83a and a second end portion 83b. The second portion 85 has a third end 83c and a fourth end 83d. The first support portions 81 and 82 extend in the Z direction from the first portion 84 of the connecting portion 83.

The first end portion 83a and the second end portion 83b have holes through which bolts 86 for fixing the first DC electrode module 80 to the capacitor control board 59 pass. The third end portion 83c has a hole into which the lower portion of the first electrode member 19b is inserted. The fourth end portion 83d has a hole into which the lower portion of the second electrode member 20b is inserted. The distance between the two first supports 81 and 82 is indicated by L1. The two first support portions 81 and 82 are located between the first end portion 83a and the second end portion 83b.

FIG. 24 is a perspective view of the second DC electrode module 90. The second DC electrode module 90 has two columnar second support portions 91 and 92, and a connecting portion 93 that connects the second support portions 91 and 92 at the bottom. Both ends 93a and 93b of the connecting portion 93 are provided with holes through which bolts 96 for fixing the second DC electrode module 90 to the power substrate 43 pass. The distance between the two second supports 91 and 92 is indicated by L2. The second support portions 91 and 92 extend in the Z direction from the connecting portion 93. The distance L2 between the two second support portions 91 and 92 is smaller than the distance L1 between the two first support portions 81 and 82.

As shown in FIG. 14, the capacitor control board 59 is also provided with notches 59d and 59e. The notch portion 59d is a notch portion for passing the flexible substrate 58 in the Z direction. The notch portion 59e is a notch portion for bolt fastening work. The flexible substrate 58 extends between the second support portions 91 and 92 of the second DC electrode module 90. The lower end of the flexible board 58 extending in the Z direction is connected to the power board 43, and the upper end of the flexible board 58 is connected to the inverter control board 51. The flexible board 58 transmits a signal from the inverter control board 51 to the power board 43.
The second support members 91 and 92 of the second DC electrode module 80 penetrate the capacitor control board 59 and extend upward.

As shown in FIG. 16, the power substrate 43 has a plurality of semiconductor elements (MOSFETs) 44 and a plate portion 45 on which the semiconductor elements 44 are placed. The second DC electrode module 90 is provided along one side 45a of the plate portion 45 of the power substrate 43. The three-phase terminal 28 has an L-shape, and one side of the L-shape extends parallel to the plate portion 45 of the power substrate 43, passes through the motor current sensor 40, and is fixed to the plate portion 45. The other side of the L shape extends perpendicularly to the plate portion 45 of the power substrate 43. The lower surface of the plate portion 45 is in contact with the upper surface 72 (FIG. 22) of the heat sink 70. As shown in FIG. 22, the upper surface 72 of the heat sink 70 has a peripheral portion 72a and a raised portion 72b that rises from the peripheral portion 72a. The raised portion 72b comes into contact with the lower surface of the plate portion 45. The capacitor control board 59 is located above the MOSFET 44. The MOSFET 44 is a component that converts a direct current into an alternating current in order to drive a motor.
As shown in FIG. 18, the upper ends (28aU, 28bU, 28cU) of the three-phase terminals 28 are fixed to the power substrate 43 by bolts 46. Reference numerals 28aU, 28bU and 28cU may be collectively referred to as 28U.

As shown in FIG. 21, the heat sink 70 has heat dissipation fins 71. More specifically, a plurality of heat radiation fins 71 extend downward from the lower surface (bottom surface) 74 of the heat sink 70. As will be described later, the heat radiating fin 71 is formed so as to be in contact with the cooling water. The power substrate 43 is cooled by cooling the heat radiating fins 71 with the cooling water. The heat radiating fin 45 may be referred to as a heat radiating portion.

FIG. 25 is a perspective view of the left side surface 14ba of the housing body 14 as viewed from above. FIG. 26 is a perspective view of the right side surface 14a of the housing body 14 as viewed from above.
As shown in FIGS. 25 and 26, the housing body 14 has a back surface 14c connecting the rear end portion of the right side surface 14a and the rear end portion of the left side surface 14b, and the front end portion of the right side surface 14a and the left side surface 14b. It has a front surface 14d that connects to the front end. The height of the back surface 14c is larger than the height of the front surface 14d. In the present embodiment, the right side surface 14a, the left side surface 14b, the back surface 14c, and the front surface 14d of the housing body 14 may be collectively referred to as a side surface portion (peripheral portion) 15 of the housing body 14. The side surface portion 15 stands up from the bottom surface 14e of the housing body 14, and an upper opening portion 15a is formed (defined) above the side surface portion 15. The upper opening 15a is closed (closed) by the top cover 12.

In order to supply the cooling water to the power conversion device 10, a refrigerant inlet opening 22a is provided on the left side surface 14b of the housing body 14. The refrigerant inlet opening 22a is connected to a first flow path 18a provided at the bottom 24 of the housing body 14.
Inside the housing body 14, a recess 27 is provided in the area where the heat sink 70 is arranged. The first flow path 18a extends to the recess 27.

The recessed portion 27 has an inlet recess 27a at a connection point with the first flow path 18a. The inlet recess 27a is a recess formed downward from the bottom surface (plane portion) 27b of the recess 27. The recess 27 has a predetermined depth. The recessed portion 27 has an outlet recess 27c in the vicinity of the right side surface 14a of the housing body 14. The outlet recess 27c is a recess formed downward from the bottom surface 27b of the recess 27. The outlet recess 27c is located at the downstream end of the recess 27.
The cooling water flowing from the refrigerant inlet opening 22a through the first pipeline 18a enters the inlet recess 27a and then collects in the flat surface portion 27b of the recess 27. Since the flat surface portion 27b is wider than the inlet recess 27a (or the first flow path 18a) in top view, the flow velocity of the cooling water becomes slower, and the cooling water flows or stays in the flat surface portion 27b at a low speed. A state can be formed.
The cooling water flowing from the refrigerant inlet opening 22a through the first pipeline 18a collides with the corner C of the recess 27 when flowing from the inlet recess 27a to the flat surface 27b of the recess 27, and the direction of flow. Is greatly changed and spreads over the flat surface portion 27b as shown by the arrow A in FIG. The cooling water then flows toward the outlet recess 27c.

The heat radiating fins 71 of the heat sink 70 are located in the recessed portion 27. The heat radiating fins 71 of the heat sink 70 are cooled by the cooling water of the recess 27, so that the heat radiating of the heat sink 70 is efficiently performed. The depth of the recess 27 is slightly larger than the height of the heat radiation fin 71.
The lower end of the outlet recess 27c is connected to the second flow path 18b. The second flow path 18b is a pipeline provided at the bottom of the housing main body 14. The second flow path 18b extends to the outlet opening 22b on the right side surface 14a of the housing body 14. The cooling water that has cooled the heat sink 70 in the recess 27 flows from the recess 27 to the outlet recess 27c, passes through the second flow path 18b, and reaches the outlet opening 22b.

An inlet opening 22a, a first flow path 18a, a recess 27 (inlet recess 27a, a flat surface portion 27b, an outlet recess 27c), a second flow path 18b, and an outlet opening 22b provided on the bottom 24 of the housing 18. The path through which the cooling water passes may be collectively referred to as a cooling flow path. In this embodiment, the cooling flow path is provided at the bottom 24 of the housing 18.

<Structure of connector module>
FIG. 27 is a perspective view of the connector module 30. FIG. 28 is a perspective view showing a state in which the three-phase terminal 28 is removed from the state of FIG. 27.
As shown in FIGS. 27 and 28, the connector module 30 includes a module main body 32, an O-ring 33 attached to the peripheral portion of the module main body 32, and a thermistor terminal 34 located below the O-ring 33. It has a terminal 35 for a motor rotation angle detection sensor and a terminal 36 for an ECU (Electronic Control Unit) located above the O-ring 33. FIG. 29 is a perspective view of the module main body 32. The thermistor terminal 34 and the motor rotation angle detection sensor terminal 35 are electrically connected to the ECU terminal 36 in the module main body 32. The module body 32 has a flat top surface 32a. The thermistor is a temperature sensor. The ECU controls the drive motor.

The longitudinal direction of the module body 32 is the same as the width direction of the housing 18. A groove 33a for mounting the O-ring 33 is provided substantially in the center in the height direction of the module body 32. The groove 33a is an annular groove extending in the horizontal direction. When the power converter 10 is attached to the motor, the portion of the connector module 30 below the O-ring 33 is immersed in oil. The O-ring 33 prevents the oil from coming above the O-ring 33. The O-ring 33 is an example of a sealing material.
The lower end 28L (28aU, 28bU, 28cU) of the three-phase terminal 28 is a terminal connected to the motor. The upper end 28U (28aU, 28bU, 28cU) of the three-phase terminal 28 is a terminal connected to the motor.
The module main body 32 has an opening 37 below the O-ring 33 for providing the thermistor terminal 34 and the motor rotation angle detection sensor terminal 35. Further, the module main body 32 has recesses 31a, 31b, and 31c below the O-ring 33 and next to the opening 37 for exposing the lower end 28L of the three-phase terminal 28.

The module main body 32 has a first columnar portion 38 and a second columnar portion 39 extending upward at both left and right ends. As shown in FIG. 8, the first columnar portion 38 and the second columnar portion 39 are support members for supporting and fixing the motor current sensor 40 from below. A flange portion 38a extending from the first columnar portion 38 in the longitudinal direction of the module body 32 (width direction of the housing 18) and a flange portion 39a extending from the second columnar portion 39 in the longitudinal direction of the module body 32. Is a portion into which a fastener (bolt) for fixing the module main body 32 to the bottom portion 24 of the housing 18 is inserted. The second columnar portion 39 and the ECU terminal 36 are provided on the upper surface 32a of the module main body 32.
The module body 32 and the three-phase terminal 28 can be manufactured by integral molding (insert molding). The module body 32 is, for example, a resin molded product. The so-called weld line formed in the module body 32 in the molding step is molded so as to be located above (+ Z direction) the O-ring 33 (or the groove 33a for attaching the O-ring 33).

<Power conversion by power converter>
For example, a DC voltage of 48 V is supplied to the first DC input unit 19 and the second DC input unit 20. This DC voltage (input voltage) is supplied to the capacitor section 50 through the first electrode section 19b and the second electrode section 20b. At that time, the current flowing through the first electrode portion 19b is detected by the DC current sensor 56. After that, the input voltage is supplied to the capacitor section 50 (capacitor control board 51) via the first DC electrode module 80. The capacitor portion 50 is connected to the second DC electrode module 90. The current from the capacitor section 50 is supplied to the power substrate 43 via the second DC electrode module 90. By the action of the MOSFET 44 of the power board 43, it is converted into a desired alternating current and supplied to the three-phase terminal 28. Then, a three-phase alternating current is supplied to the motor from the three-phase terminal 28.
FIG. 30 is a development view of the internal parts of the power conversion device 10. In FIG. 30, the housing 18 and the connector module 30 are not shown. As shown in FIG. 30, the parts of the power conversion device 10 are arranged in a laminated structure in the housing 18. That is, the power board 43 is provided on the heat sink 70, the capacitor section 50 is provided on the power board 43, and the inverter control board 51 is provided on the capacitor section 50. By having such a laminated structure, it is possible to facilitate the assembly of the parts of the power conversion device 10.

<Effect of embodiment>
In the present embodiment, the first electrode portion 19b and the second electrode portion 20b, which are rod-shaped members extending upward from the capacitor portion 50, penetrate the inverter control board 51 and extend to the DC input portions 19 and 20 at the upper part of the housing. Therefore, the wiring for supplying the DC power supplied to the power conversion device 10 to the capacitor unit 50 becomes unnecessary. Therefore, the space can be reduced by the amount of the wiring, which contributes to the miniaturization of the power conversion device 50.

In the power conversion device 10 of the present embodiment, the following configuration can also be adopted.
Mounting of each component is not limited to bolt fastening.
Although the housing 18 has a two-piece structure that can be divided into a top cover 12 and a housing body 14, it may have another structure (for example, a three-piece structure).
In addition, the configurations described above can be appropriately combined within a range that does not contradict each other.

10 ... Inverter device 12 ... Top cover 14 ... Housing body 16 ... Signal connector 18 ... Housing 24 ... Housing bottom 28 ... 3-phase terminal 30 ... Connector module 40 ... Motor current sensor 43 ... Power board 44 ... MOSFET
50 ... Capacitor section 51 ... Inverter control board 70 ... Heat sink 80 ... First DC electrode module 90 ... Second DC electrode module

Claims (12)

A housing having a bottom portion, a side portion that stands up from the bottom portion, an upper portion that closes an upper opening of the side portion, and a refrigerant flow path provided in the bottom portion.
A heat sink housed in the housing and arranged at the bottom of the housing,
A power board housed in the housing and arranged above the heat sink,
A capacitor portion housed in the housing and arranged above the power board, and
A power conversion device including a control board housed in the housing and arranged above the capacitor unit.
The capacitor section includes a capacitor control board, an electrolytic capacitor mounted on the capacitor control board, and a first DC electrode module mounted on the capacitor control board at a position different from the electrolytic capacitor. And
A rod-shaped member for supplying the DC power supplied to the power conversion device from the DC power input unit provided in the upper part of the housing to the capacitor unit extends from the first DC electrode module to the control board. A power conversion device characterized by penetrating the DC power input unit and reaching the DC power input unit. The power conversion device according to claim 1, wherein a MOSFET is mounted on the power board, and the capacitor control board is located above the MOSFET. The power converter further comprises a second DC electrode module extending upward from the power substrate.
The capacitor control board has a substantially rectangular shape, and the first DC electrode module is provided in the vicinity of one side of the substantially rectangular shape, and the second DC electrode module is located in the vicinity of the opposite side of the substantially rectangular shape. The power conversion device according to claim 1 or 2, wherein the power conversion device extends upward. The electric power according to claim 3, wherein the second DC electrode module supplies electric power supplied to the capacitor control substrate via the first DC electrode module from the capacitor substrate to the power substrate. Conversion device. The first DC electrode module has a columnar first support member extending upward, and the second DC electrode module has a columnar second support member extending upward.
According to claim 3 or 4, the control board is supported above the capacitor portion by the first support member of the first DC electrode module and the second support member of the second DC electrode module. The power converter described. The power conversion device according to claim 5, wherein the rod-shaped member is provided between the first support member of the first DC electrode module and the electrolytic capacitor. The second support member of the second DC electrode module has two columnar support members.
The power conversion device according to claim 6, wherein the flexible substrate for transmitting a signal from the control substrate to the power substrate extends between the two columnar support members. The first support member of the first DC electrode module has two columnar support members, and the second support member of the second DC electrode module has two columnar support members.
The electric power according to claim 6 or 7, wherein the distance between the two columnar support members of the first support member is larger than the distance between the two columnar support members of the second support member. Conversion device. The power conversion device according to claim 7, wherein the second support member of the second DC electrode module penetrates the capacitor control board and extends upward. A plurality of notches are provided in the peripheral portion of the capacitor control board.
The plurality of notches are a notch for passing a flexible substrate for transmitting a signal from the control board to the power board, and a notch for fastening work for fastening the power board onto the heat sink. The power conversion device according to any one of claims 1 to 9, wherein the power conversion device includes a part. The power conversion device according to any one of claims 1 to 10, wherein the DC power supplied to the power conversion device is a 48V DC current. The refrigerant water channel has a recess portion having a predetermined depth and being exposed on the upper surface of the bottom portion of the housing.
The power conversion device according to any one of claims 1 to 11, wherein the heat sink has a plurality of heat radiating protrusions extending downward, and the heat radiating protrusions are located in the recessed portion.

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