JP2017172509A - Inverter integrated type electric compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inverter integrated type electric compressor which enables easy handling while improving the durability of an inverter circuit part and achieves reduction of the number of components.SOLUTION: An inverter circuit part 3 includes a high heat radiation substrate 14, a control board 17 and a bus bar assembly 18. The inverter circuit part 3, in which the high heat radiation substrate 14, the bus bar assembly 18, and the control board 17 are integrated in a lamination state, is housed in an inverter housing part 8 of a motor housing 4 to be attached thereto. In the state, an electric power switching element has a heat exchange relation with the motor housing 4.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an inverter-integrated electric compressor having an inverter circuit portion in a housing.

  2. Description of the Related Art Conventionally, as an electric compressor used in a vehicle air conditioner, an inverter-integrated electric compressor in which an inverter circuit portion is attached to a housing is used in consideration of switching noise. In this case, the inverter circuit unit cools the power switching element mounted on the substrate, so that the power switching element is in close contact with the outer surface of the housing or in close contact with the heat conduction sheet or grease. It will be attached.

  Moreover, since the accommodation space of the electric compressor has to be reduced as much as possible, it is also necessary to reduce the volume of the inverter circuit unit. Therefore, a bus bar assembly connected to a board on which a power switching element is conventionally mounted and a board on which a control circuit is mounted is prepared, and this bus bar assembly is sandwiched and integrated between both boards, and in that state via a base plate, A structure to be attached to the outer surface of the housing has been proposed (see, for example, Patent Document 1).

JP 2004-190547 A

  However, the conventional configuration has a structure in which the resin-molded bus bar assembly is exposed to the outside on the outer surface of the housing, and thus there is a problem in durability. Moreover, since the bus bar assembly is increased in size, there is a problem that handling work of the integrated inverter circuit unit is deteriorated. Furthermore, there is a disadvantage that the base plate is required to bring the power switching element into close contact with the housing without stress and being cut off from the outside, which increases the number of parts.

  The present invention has been made to solve the conventional technical problem, and is an inverter-integrated electric motor that can be handled easily while reducing the number of components while improving the durability of the inverter circuit section. An object is to provide a compressor.

  An inverter-integrated electric compressor of the present invention includes a housing in which a motor is built, and an inverter circuit unit that supplies power to the motor. The inverter circuit unit includes a high heat dissipation board on which a power switching element is mounted; The control board on which the control circuit is mounted and the resin molded bus bar assembly are integrated in a state where the high heat dissipation board, the bus bar assembly, and the control board are stacked, and the integrated inverter The circuit portion is accommodated in and attached to the inverter accommodating portion configured in the housing, and the power switching element is arranged in a heat exchange relationship with the housing in that state.

  According to a second aspect of the present invention, the inverter-integrated electric compressor is integrated with the bus bar assembly sandwiched between the high heat dissipation board and the control board, and the bus bar assembly is integrated with the high heat dissipation board. And a positioning pin with the control board.

  According to a third aspect of the present invention, there is provided an inverter-integrated electric compressor according to the present invention, wherein the inverter circuit unit is a state in which the high heat dissipation board, the bus bar assembly, and the control board are integrated. And a space between the bus bar assembly.

  According to a fourth aspect of the present invention, there is provided the inverter-integrated electric compressor. It has an interval holding part extending between the control board and the bus bar assembly.

  In the inverter-integrated electric compressor according to the invention of claim 5, in each of the inventions, the inverter circuit unit integrally includes a smoothing capacitor for absorbing a high-frequency component of the switching current, and the integrated inverter circuit unit includes: The smoothing capacitor is also disposed in a heat exchange relationship with the housing while being accommodated in the inverter accommodating portion and attached to the housing.

  The inverter-integrated electric compressor according to a sixth aspect of the present invention is characterized in that, in each of the above-described inventions, the inverter accommodating portion is closed so as to be opened and closed by a lid member in a state where the inverter circuit portion is accommodated therein.

  According to the present invention, in an inverter-integrated electric compressor having a housing with a built-in motor and an inverter circuit unit that supplies power to the motor, the inverter circuit unit includes a high heat dissipation board on which a power switching element is mounted, and a control circuit. A control board on which a circuit is mounted and a resin-molded bus bar assembly are provided, and the high heat dissipation board, the bus bar assembly, and the control board are integrated in a stacked state, and the integrated inverter circuit unit is Since the power switching element is accommodated in the inverter accommodating portion configured in the housing and attached to the housing, and in this state, the power switching element is arranged in a heat exchange relationship with the housing. The inverter housing part can be opened and closed with a lid member while the inverter circuit part is housed inside. In Rukoto, it is possible to eliminate the conventional such as durability problems.

  Moreover, since the integrated inverter circuit part can be reduced in size compared with the conventional one, handling is also facilitated. Further, the power switching element can be cooled without hindrance, and the base plate is not necessary, so that the number of parts can be reduced.

  According to the invention of claim 2, in addition to the above invention, the inverter circuit portion is integrated with the bus bar assembly sandwiched between the high heat dissipation substrate and the control substrate, so that the strength of the integrated inverter circuit portion is increased. Since the positioning pins for the high heat dissipation board and the control board are provided in the bus bar assembly, the strength can be maintained while maintaining the assembly accuracy.

  In this case, as in the invention of claim 3, the inverter circuit portion is formed with a space between the high heat dissipation board and the bus bar assembly, and between the control board and the bus bar assembly in a state where the high heat dissipation board, the bus bar assembly, and the control board are integrated. If this is configured, the mounting area of the parts can be increased, and the mounting amount and workability can be improved.

  Further, the bus bar assembly according to the invention of claim 4 is provided with a wall portion protruding in the thickness direction at the peripheral portion, and the space is configured inside the wall portion, and the control board is formed in the space. If a space holding part is provided over the bus bar assembly, the space formed inside can be maintained with high strength.

  According to a fifth aspect of the present invention, a smoothing capacitor for absorbing a high frequency component of the switching current is integrally provided in the inverter circuit portion, and the integrated inverter circuit portion is accommodated in the inverter accommodating portion, If the smoothing capacitor is also placed in a heat exchange relationship with the housing in the attached state, the handling and durability of the inverter circuit unit including the smoothing capacitor can be improved, and the smoothing capacitor Cooling can be performed without any problem.

1 is a perspective view of an inverter-integrated electric compressor according to an embodiment to which the present invention is applied. FIG. 2 is a perspective view of a state where a cover member of the inverter-integrated electric compressor in FIG. 1 is removed. It is a disassembled perspective view of the housing and inverter circuit part of the inverter integrated electric compressor of FIG. It is the top view seen from the inverter accommodating part side of the state which removed the cover member of the inverter integrated electric compressor of FIG. It is the sectional view on the AA line of FIG. It is an upper perspective view of the inverter circuit part of the inverter integrated electric compressor of FIG. It is a downward perspective view of the inverter circuit part of FIG. It is a disassembled perspective view of parts other than the smoothing capacitor of the inverter circuit part of FIG.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. The inverter-integrated electric compressor 1 of the embodiment constitutes a part of a refrigerant circuit of a vehicle air conditioner that air-conditions a vehicle interior of a vehicle (not shown), and is driven by a motor (not shown) and this motor. A housing 2 containing a compression mechanism (not shown) and an inverter circuit unit 3 for driving the motor are provided. The housing 2 includes a motor housing 4 containing the motor, a compression mechanism housing 6 connected to one side in the axial direction of the motor housing 4 and containing the compression mechanism, and one side of the compression mechanism housing 6. A compression mechanism cover 7 that closes the opening, an inverter accommodating portion 8 that is configured on the other side in the axial direction of the motor housing 4, and a lid member 11 that closes the opening 9 on the other side of the inverter accommodating portion 8 so as to be openable and closable. I have. And the inverter circuit part 3 is accommodated in this inverter accommodating part 8. FIG.

  1 to 3 show the inverter-integrated electric compressor 1 of the embodiment with the inverter accommodating portion 8 facing up and the compression mechanism cover 7 facing down. One side is arranged in the lateral direction so that the inverter accommodating portion 8 is on the other side.

  The motor of the embodiment is composed of a three-phase synchronous motor (brushless DC motor), and the compression mechanism is, for example, a scroll type compression mechanism. The compression mechanism is driven by a motor, compresses the refrigerant, and discharges it into the refrigerant circuit. A low-temperature gas refrigerant sucked from an evaporator (also referred to as a heat absorber) that also forms part of the refrigerant circuit is circulated in the motor housing 4. Therefore, the inside of the motor housing 4 is cooled. And the inverter accommodating part 8 is divided with the inside of the motor housing 4 in which a motor is accommodated by the partition 12 formed in the motor housing 4, and this partition 12 is also cooled by a low temperature gas refrigerant.

(1) Configuration of Inverter Circuit Unit 3 The inverter circuit unit 3 includes a high heat dissipation substrate 14 on which a power switching element 13 constituting an arm of each phase of a three-phase inverter circuit is mounted, and a control on which a control circuit 16 is mounted. A substrate 17, a bus bar assembly 18 connected to the power switching element 13 of the high heat dissipation substrate 14, and a filter mold assembly 21 on which a smoothing capacitor 19 is mounted.

  The inverter circuit unit 3 converts DC power fed from a vehicle battery (not shown) into three-phase AC power and feeds it to a stator coil (not shown) of the motor. Therefore, the connection point between the power switching element 13 on the upper arm side and the power switching element 13 on the lower arm side of each phase has three terminals on the lead terminals 22, 23 and 24 drawn from the partition wall 12 of the motor housing 4. The power terminal of the power switching element 13 on the upper arm side and the ground terminal of the power switching element 13 on the lower arm side are connected to each other via the plate 26 and are called an HV connector of the connector case 27 attached to the motor housing 4. It is connected to the power harness from the battery described above via the high power connector 28 (consisting of screws).

  In this case, the lead terminals 22 to 24 to which the connection points of the upper arm side power switching element 13 and the lower arm side power switching element 13 of each phase are connected penetrate the partition wall 12 and the motor in the motor housing 4. Are connected to the aforementioned stator coil. Further, the power supply terminal and the ground terminal are the terminal plate 29 of the filter mold assembly 21, the conductive member 31 called an EMC bus bar assembly, the conductive circuit board 32 called an EMC board, the connector bus bar 33, and the high power described above. Connected to the power harness through the connector 28 and the like. Reference numeral 34 denotes a bus bar case called an EMC filter case in which the connector bus bar 33 is built.

(2) Configuration of the high heat dissipation board 14 The high heat dissipation board 14 is formed in a thick plate shape by a resin for molding a circuit board, and each power switching element 13 and its peripheral circuit components are arranged on one side. In addition, the power switching element 13 is configured to pass through the high heat dissipation substrate 14 and exchange heat with the other side. Note that circuit components around the power switching element 13 are also arranged on the other surface.

  In addition, on one surface of the high heat dissipation substrate 14, electrode terminals (screws) 36, 37, 38 that are connected to the connection point between the power switching element 13 on the upper arm side and the power switching element 13 on the lower arm side of each phase described above. These are connected to the lead terminals 22, 23 and 24 drawn from the partition wall 12 via the terminal plate 26 via bus bars 46, 47 and 48 of the bus bar assembly 18 which will be described later. . Furthermore, electrode terminals (screws) 42 and 43 that are connected to the power supply terminal and the ground terminal are projected on one surface of the high heat dissipation substrate 14, and these are connected via bus bars 49 and 50 of the bus bar assembly 18 described later. It is connected to the terminal plate 44 of the filter mold assembly 21. Furthermore, a connector 39 connected to the control circuit 16 of the control board 17 is attached to the periphery of one surface of the high heat dissipation board 14 outside the bus bar assembly 18.

(3) Configuration of Control Board 17 The control circuits 16 of the control board 17 are arranged on both sides of the control board 17 and perform switching control of each power switching element 13 of the high heat dissipation board 14 based on a command from the outside. . Also, it has a function of transmitting the motor drive state to the outside, and is configured by connecting circuit components such as a microcomputer by printed wiring. Further, a connection portion 41 to which the connector 39 of the high heat dissipation substrate 14 described above is connected is disposed around the control substrate 17.

(4) Configuration of Filter Mold Assembly 21 The smoothing capacitor 19 is connected between the power supply terminal and the ground terminal of the three-phase inverter circuit, and absorbs the high-frequency component of the switching current of the three-phase inverter circuit. The smoothing capacitor 19 is disposed on a filter mold assembly (circuit board) 21, and the terminal plate 29 of the filter mold assembly 21 is connected to the conducting member 31 as described above, and the conducting circuit board 32, the connector bus bar 33, and The terminal board 44 is connected to the above-described electrode terminals 42 and 43 of the high heat dissipation board 14 through electrical connection to the power harness through the high power connector 28 and the like.

(5) Configuration of Bus Bar Assembly 18 The bus bar assembly 18 has five bus bars 46, 47, 48, 49, and 50 that form wiring of a three-phase inverter circuit. The bus bars 46 to 50 are arranged at positions outside the control board 17 and integrated by insert molding of an insulating hard resin, and the electrode terminals 36 and 37 of the high heat dissipation board 14 are formed by the bus bars 46 to 48. 38 and each terminal plate 26 are connected, and the electrode terminals 42 and 43 and the terminal plate 44 of the filter mold assembly 21 are connected by bus bars 49 and 50.

  A wall portion 51 is integrally formed at the peripheral portion of the bus bar assembly 18 so as to protrude in a thickness direction toward both the one surface and the other surface in a thickness direction. Ten screw holes 52 to 61 are formed. In addition, a plurality of metal dummy bus bars 62 (five in the embodiment) projecting from the wall 51 are provided at predetermined positions on one surface inside the wall 51. Further, positioning pins 63 and 64 project from predetermined positions on one surface and the other surface of the bus bar assembly 18.

  On the other hand, a plurality of screw holes 66 to 72 are formed at positions corresponding to the screw holes 53, 54, 55, 56, 57, 60, 61 of the bus bar assembly 18 in the peripheral portion of the high heat dissipation substrate 14. Further, screw holes 89 to 93 are formed in the high heat dissipation substrate 14 at positions corresponding to the bus bars 46 to 50 of the bus bar assembly 18. Further, a plurality of screw holes 73 to 80 are formed in the peripheral portion of the control board 17 at positions corresponding to the screw holes 52, 53, 54, 55, 56, 57, 58, 61 of the bus bar assembly 18. A plurality of through holes 81 are formed in the control board 17 at a position corresponding to the dummy bus bar 62 of the bus bar assembly 18. Furthermore, engagement holes 82, 83, 84, 86 are formed in the high heat dissipation board 14 and the control board 17 at positions corresponding to the positioning pins 63, 64 of the bus bar assembly 18, respectively.

(6) Assembly procedure of inverter circuit unit 3 Next, an assembly procedure of the inverter circuit unit 3 will be described with the above configuration. First, as shown in FIG. 8, the high heat dissipation board 14 and the bus bar assembly are sandwiched between the high heat dissipation board 14 on which the power switching element 13 and the like are mounted and the control board 17 on which the control circuit 16 is mounted, with the bus bar assembly 18 interposed therebetween. 18 and the control board 17 are laminated. At this time, the positioning pins 63 and 64 of the bus bar assembly 18 are engaged with the engagement holes 82 and 83 of the high heat dissipation board 14 and the engagement holes 84 and 86 of the control board 17, respectively. The position of is determined with high accuracy.

  In such a stacked state, the screw holes 66 to 72 of the high heat dissipation substrate 14 correspond to the other surface sides of the screw holes 53, 54, 55, 56, 57, 60, 61 of the bus bar assembly 18, and The screw holes 89 to 93 of the heat dissipation board 14 correspond to the other surface side of the bus bars 46 to 50 of the bus bar assembly 18. The screw holes 73 to 80 of the control board 17 correspond to one side of the screw holes 52, 53, 54, 55, 56, 57, 58, 61 of the bus bar assembly 18, and the dummy bus bars of the bus bar assembly 18. 62 enters each through-hole 81 of the control board 17.

  In this state, the electrode terminals 36, 37, 38, 42, and 43 made of screws are inserted into the screw holes 89 to 93 from the other surface side of the high heat dissipation substrate 14 to penetrate the high heat dissipation substrate 14. Then, they are screwed into the bus bars 46 to 50 of the bus bar assembly 18 respectively. By this screwing, the electrode terminals 36, 37, 38, 42, 43 are electrically connected to the circuit board of the high heat dissipation board 14 and the bus bars 46-50.

  Further, screws 87 and 88 are inserted into the screw holes 73 and 79 from one surface side of the control board 17, and are screwed into the screw holes 52 and 58 of the bus bar assembly 18 through the control board 17. Further, each dummy bus bar 62 is soldered to the control board 17 in each through hole 81 of the control board 17, and the dummy bus bar 62 is fixed from the bus bar assembly 18 to the control board 17. The connector 39 of the high heat dissipation board 14 is connected to the connection portion 41 of the control board 17 and both are soldered.

  By such screwing and soldering, the high heat dissipation board 14, the bus bar assembly 18, and the control board 17 are integrated. At this time, since the wall portion 51 is formed in the peripheral portion of the bus bar assembly 18, between the high heat dissipation substrate 14 and the bus bar assembly 18 inside the wall portion 51 and between the control substrate 17 and the bus bar assembly 18. There is a space. In this space, the power switching element 13 and other circuit components disposed on the one surface side of the high heat dissipation substrate 14 and the circuit components disposed on the other surface side of the control substrate 17 are located. In addition, the plurality of metal dummy bus bars 62 are soldered to the control board 17, so that the distance between the control board 17 and the bus bar assembly 18 is well maintained.

  Next, with the smoothing capacitor 19 on the high heat dissipation substrate 14 side, the terminal plate 44 of the filter mold assembly 21 is directed to one side of the bus bars 49, 50 of the bus bar assembly 18, and screws 94, 96 are inserted to insert the bus bar. The filter mold assembly 21 is screwed to the bus bar assembly 18 by being screwed to 49 and 50. In this state, the terminal plate 44 is electrically connected to the electrode terminals 42 and 43 through the bus bars 49 and 50, respectively. As a result, the inverter circuit unit 3 including the high heat dissipation substrate 14, the control substrate 17, the bus bar assembly 18, and the filter mold assembly 21 (smoothing capacitor 19) is integrated (sub-assembled) as shown in FIG.

(7) Assembly procedure of inverter circuit unit 3 The inverter circuit unit 3 integrated in this way is accommodated in the inverter accommodating part 8 of the motor housing 4 with the high heat dissipation substrate 14 as the partition wall 12 side. At this time, a sheet or grease for heat conduction is provided on the other surface of the high heat dissipation substrate 14 at a position corresponding to the power switching element 13, and each power switching element 13 is brought into close contact with the partition wall 12 through these to exchange heat. It is related. Further, the smoothing capacitor 19 is also brought into close contact with the partition wall 12 for heat exchange.

  Next, the screw 97 is inserted into the screw holes 74, 53, 66, the screw 98 is inserted into the screw holes 75, 54, 67, the screw 99 is inserted into the screw holes 76, 55, 68, and the screw 100 is inserted into the screw holes. 77, 56 and 69, the screw 101 is inserted into the screw holes 78, 57 and 70, the screw 102 is inserted into the screw hole 59 and the screw hole 107 of the filter mold assembly 21, and the screw 103 is inserted into the screw holes 60 and 71. The screws 104 are inserted into the screw holes 80, 61, 72, and the screws 97 to 104 are screwed into the motor housing 4. Further, the screw circuit 108 is inserted into another screw hole 107 formed in the filter mold assembly 21 and screwed into the motor housing 4 to attach the inverter circuit unit 3 to the motor housing 4 (housing 2).

  Thereafter, the terminal plate 26 is attached between the lead terminals 22, 23, 24 and the bus bars 46, 47, 48 by screwing, and is conducted. Further, the terminal plate 29 of the filter mold assembly 21 is attached to the conducting member 31 with the screw 110 to conduct (FIGS. 4 and 2). Finally, the lid member 11 is attached to the opening 9 of the inverter accommodating portion 8 with a plurality of screws 109, and the opening 9 of the inverter accommodating portion 8 is closed so as to be opened and closed (FIG. 1).

  As described above in detail, according to the present invention, the high heat dissipation substrate 14 on which the power switching element 13 is mounted and the resin-molded power connection element 13 of the high heat dissipation substrate 14 and the smoothing capacitor 19 of the filter mold assembly 21 are connected. The bus bar assembly 18 and the control board 17 on which the control circuit 26 is mounted are integrated in a stacked state to constitute the inverter circuit unit 3, and the integrated inverter circuit unit 3 is connected to the motor of the housing 2. The power switching element 13 is accommodated in the inverter housing 8 configured in the housing 4 and attached to the motor housing 4 of the housing 2, and the power switching element 13 is arranged in a heat exchange relationship with the motor housing 4 of the housing 2 in that state. .

  Thereby, in the state which accommodated the inverter circuit part 3 in the inside of the inverter accommodating part 8, the durability of the inverter circuit part 3 is improved compared with the past by closing the inverter accommodating part 8 with the cover member 11 so that opening and closing is possible. It can be improved significantly.

  Moreover, since the integrated inverter circuit unit 3 can be reduced in size as compared with the conventional one, handling is also facilitated. Further, the power switching element 13 can be cooled by the partition wall 12 without any trouble, and a conventional base plate is not required, so that the number of parts can be reduced.

  Further, in the embodiment, the inverter circuit unit 3 is integrated by screwing with the bus bar assembly 18 sandwiched between the high heat dissipation substrate 14 and the control substrate 17, so that the strength of the integrated inverter circuit unit 3 is improved. In addition, since the positioning pins 63 and 64 for the high heat dissipation board 14 and the control board 17 are provided on the bus bar assembly 18, the strength can be maintained while maintaining the assembly accuracy. .

  In this case, in the embodiment, the inverter circuit unit 3 is integrated with the high heat dissipation board 14, the bus bar assembly 18, and the control board 17, and the high heat dissipation board 14 and the bus bar assembly 18, and the control board 17 and the bus bar assembly 18. Since the space is formed between the two, the mounting area of the circuit component is increased, and the mounting amount and workability can be improved.

  Further, the bus bar assembly 18 is provided with a wall portion 51 projecting in the thickness direction at the peripheral portion so that a space is formed inside the wall portion 51, and the control board 17 and the bus bar assembly 18 are formed in the space. Since the dummy bus bar 62 is provided, the space formed inside can be maintained with high strength.

  Further, a filter mold assembly 21 on which a smoothing capacitor 19 for absorbing a high-frequency component of the switching current is mounted is provided integrally with the inverter circuit unit 3, and the integrated inverter circuit unit 3 is accommodated in the inverter accommodation unit 8. Since the smoothing capacitor 19 is also arranged in a heat exchange relationship with the motor housing 4 of the housing 2 while being attached to the motor housing 4 of the housing 2, the handling performance of the inverter circuit unit 3 including the smoothing capacitor 19 is arranged. Thus, the durability can be improved and the smoothing capacitor 19 can be cooled without any trouble.

  It should be noted that the shape and structure of the inverter circuit section 3 and the housing 2 shown in the embodiments are not limited thereto, and it goes without saying that various changes can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Inverter integrated electric compressor 2 Housing 3 Inverter circuit part 4 Motor housing 6 Compression mechanism housing 8 Inverter accommodating part 9 Opening 11 Lid member 12 Partition 13 Power switching element 14 High heat dissipation board 16 Control circuit 17 Control board 18 Bus bar assembly 19 Smooth Capacitor 21 Filter mold assembly 22 to 24 Lead terminal 46 to 50 Bus bar 51 Wall portion 62 Dummy bus bar (interval holding portion)
63, 64 Locating pin 87, 88 Screw

Claims (6)

In an inverter-integrated electric compressor having a housing with a built-in motor and an inverter circuit unit for supplying power to the motor,
The inverter circuit unit includes a high heat dissipation board on which a power switching element is mounted, a control board on which a control circuit is mounted, and a resin-molded bus bar assembly. The high heat dissipation board, the bus bar assembly, and the control board include It is integrated in a stacked state,
The integrated inverter circuit portion is accommodated in the inverter accommodating portion configured in the housing and attached to the housing, and in this state, the power switching element is disposed in a heat exchange relationship with the housing. An inverter-integrated electric compressor characterized by that.   The inverter circuit unit is integrated with the bus bar assembly sandwiched between the high heat dissipation board and the control board, and the bus bar assembly includes positioning pins for the high heat dissipation board and the control board. The inverter-integrated electric compressor according to claim 1.   The inverter circuit unit includes a space between the high heat dissipation board and the bus bar assembly and the control board and the bus bar assembly in a state where the high heat dissipation board, the bus bar assembly, and the control board are integrated. The inverter-integrated electric compressor according to claim 2.   The bus bar assembly includes a wall portion projecting in the thickness direction at a peripheral portion, and the space is formed inside the wall portion, and a space holding portion extending between the control board and the bus bar assembly is provided in the space. The inverter-integrated electric compressor according to claim 3.   The inverter circuit unit is integrally provided with a smoothing capacitor for absorbing a high-frequency component of a switching current, and the integrated inverter circuit unit is housed in the inverter housing unit and attached to the housing. The inverter-integrated electric compressor according to any one of claims 1 to 4, wherein the smoothing capacitor is also disposed in a heat exchange relationship with the housing.   6. The inverter according to claim 1, wherein the inverter housing portion is closed by a lid member in a state where the inverter circuit portion is housed therein. Body type electric compressor.

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