Power conversion device

Abstract

To provide a power conversion device with a motor connection AC connector to which a motor is connected, the load of a cover part of the power conversion device being reduced and the rigidity of the cover part being reduced accordingly.SOLUTION: The system includes: a power module 20 forming at least a part of a power conversion circuit; a motor connection AC connector 15c connected to a motor-side connector provided in a motor; a motor connection busbar 16 connecting the motor connection AC connector 15c and the power module 20; a lower cover 32 covering the power module 20 and abutted by a motor-side connector 201; and a central plate 31 separate from the lower cover 32, the motor connection AC connector 15c being fixed to the central plate 31.SELECTED DRAWING: Figure 5

Description

[Technical Field]

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

[0002] For example, Patent Document 1 discloses a connector device equipped with an inverter-side connector. The connector device disclosed in Patent Document 1 connects the motor and the inverter by attaching the motor-side connector to the inverter-side connector. In the connector device disclosed in Patent Document 1, the inverter-side connector is fixed to the inverter case. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6441095 Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, the inverter-side connector is fixed to a cover-shaped bottom wall portion of the inverter case (hereinafter referred to as the cover portion) that covers the power module and the like. When the inverter-side connector is inserted into the motor-side connector, the inverter-side connector receives a reaction force from the motor-side connector. This reaction force is constantly generated and is received by the cover portion to which the inverter-side connector is fixed. Furthermore, the motor-side connector is pressed against the cover portion. To seal the connection between the inverter-side connector and the motor-side connector, the motor-side connector is pressed strongly against the cover portion via a sealing member. Therefore, with the configuration disclosed in Patent Document 1, the force received by the cover portion becomes large after manufacturing, and the rigidity of the cover portion cannot be reduced.

[0005] The present invention has been made in consideration of the above-mentioned problems, and aims to reduce the load on the cover portion and thereby the rigidity of the cover portion in a power conversion device equipped with a motor connection AC connector to which a motor is connected. [Means for solving the problem]

[0006] The present invention employs the following configuration as a means for solving the above problems.

[0007] One aspect of the present invention is a power conversion device comprising: a power module forming at least a part of a power conversion circuit; a motor-connecting AC connector to which a motor-side connector provided on a motor is connected; a motor-connecting bus bar connecting the motor-connecting AC connector to the power module; a cover portion against which the motor-side connector connected to the motor-connecting AC connector abuts and which covers the power module; and a connector fixing portion that is separate from the cover portion and to which the motor-connecting AC connector is fixed. [Effects of the Invention]

[0008] According to the present invention, the motor-connecting AC connector to which the motor is connected is fixed to a connector fixing portion that is separate from the cover portion to which the motor-side connector abuts. Therefore, the reaction force acting on the motor-connecting AC connector when the motor-connecting AC connector is inserted into the motor-side connector is received by the connector fixing portion. Therefore, according to the present invention, the load on the cover portion can be reduced. Therefore, the present invention can reduce the load on the cover portion and reduce the rigidity of the cover portion in a power conversion device including a motor-connecting AC connector to which a motor is connected. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic configuration diagram of a vehicle equipped with a power conversion device according to an embodiment of the present invention. [Figure 2]1 is a circuit diagram showing a schematic electrical configuration of a step-up / step-down converter and an inverter included in a power conversion device according to an embodiment of the present invention. [Figure 3] 1 is an exploded perspective view showing a schematic structural configuration of a power conversion device according to an embodiment of the present invention. [Figure 4] 1 is a schematic perspective view of a connector unit included in a power conversion device according to an embodiment of the present invention. [Figure 5] 1 is a schematic cross-sectional view including a power converter connector unit according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a power conversion device according to the present invention will be described below with reference to the drawings.

[0011] Fig. 1 is a schematic configuration diagram of a vehicle 100 equipped with a power conversion device 1 according to the present embodiment. The vehicle 100 is, for example, an electric vehicle or a hybrid vehicle. As shown in Fig. 1, the vehicle 100 includes, for example, a high-voltage battery HB, a low-voltage battery LB, a motor M, and the power conversion device 1 according to the present embodiment.

[0012] The high-voltage battery HB is a secondary battery such as a lithium-ion battery, and outputs relatively high-voltage DC power of, for example, several hundred volts. This high-voltage battery HB is a battery that outputs driving power to be supplied to the motor M, and is a so-called driving battery. The low-voltage battery LB is a secondary battery such as a lead-acid battery, and outputs relatively low-voltage DC power of, for example, about 12 V. This low-voltage battery LB is a battery that outputs auxiliary power to be supplied to auxiliary devices (not shown), and is a so-called auxiliary device battery.

[0013] The motor M generates rotational power by receiving drive power from the high-voltage battery HB via the power conversion device 1. The rotational power generated by the motor M is transmitted to the drive wheels of the vehicle 100 via a transmission mechanism (not shown). In this embodiment, the motor M includes a first motor M1 and a second motor M2. For example, the first motor M1 generates power supplied to the front wheels of the vehicle 100. Furthermore, for example, the second motor M2 generates power supplied to the rear wheels of the vehicle 100.

[0014] The power conversion device 1 of this embodiment is a device that performs power conversion. For example, the power conversion device 1 converts DC power to AC power, AC power to DC power, and voltage. Specifically, the power conversion device 1 of this embodiment boosts the drive power output from the high-voltage battery HB and converts it to AC, and supplies it to the motor M. The power conversion device 1 of this embodiment also converts the regenerative power output from the motor M to DC, reduces the voltage, and supplies it to the high-voltage battery HB. Furthermore, the power conversion device 1 of this embodiment reduces the voltage of the drive power output from the high-voltage battery HB to generate power for auxiliary devices, and supplies it to the low-voltage battery LB.

[0015] As shown in FIG. 1, the power conversion device 1 of this embodiment includes a buck-boost converter 2, an inverter 3, and a DC-DC converter 4. The buck-boost converter 2, inverter 3, and DC-DC converter 4 constitute a power conversion circuit H that performs power conversion. The buck-boost converter 2 boosts or lowers the voltage of power. For example, the buck-boost converter 2 boosts the drive power supplied from a high-voltage battery HB and outputs the boosted power to the inverter 3. The buck-boost converter 2 also lowers the regenerative power supplied from the inverter 3 and outputs the power to the high-voltage battery HB.

[0016] The inverter 3 converts DC power to AC power or AC power to DC power. For example, the inverter 3 converts DC driving power supplied from the step-up / step-down converter 2 into three-phase AC power and outputs it to the motor M. The inverter 3 also converts AC regenerative power supplied from the motor M into DC power and outputs it to the high-voltage battery HB. In this embodiment, the inverter 3 includes a first inverter 3a and a second inverter 3b. The first inverter 3a is connected to the first motor M1. The second inverter 3b is connected to the second motor M2.

[0017] The DC-DC converter 4 converts the drive power output from the high-voltage battery HB into power for the auxiliary devices by stepping down the voltage. The DC-DC converter 4 converts the drive power, which is DC, into power for the auxiliary devices.

[0018] Fig. 2 is a circuit diagram showing a schematic electrical configuration of the step-up / step-down converter 2 and the inverter 3. As shown in Fig. 2, the power conversion device 1 of this embodiment includes the step-up / step-down converter 2 and the inverter 3, which are connected to each other.

[0019] The step-up / step-down converter 2 includes two power devices D, two capacitors C, and a reactor L. One of the two capacitors C (hereinafter referred to as the first capacitor C1) stores power before boosting when power is supplied from the high-voltage battery HB to the motor M. The other of the two capacitors C (hereinafter referred to as the second capacitor C2) stores power after boosting when power is supplied from the high-voltage battery HB to the motor M. Note that the first capacitor C1 and the second capacitor C2 are not limited to being formed by a single element. The first capacitor C1 may be formed by using a plurality of elements, and the second capacitor C2 may be formed by using a plurality of elements.

[0020] Each inverter 3 includes three power devices D. Each power device D includes a power transistor. These power transistors include semiconductor elements and are mounted on an insulated circuit board. In this embodiment, one power device D includes two power transistors. However, a power device including a single power transistor may be included. In this case, four power devices are provided in the step-up / step-down converter 2, and six power devices are provided in the inverter 3. For example, each power transistor includes a plurality of semiconductor elements formed of, for example, SiC (silicon carbide). The power transistor may include semiconductor elements formed of other materials such as Si (silicon) or GaN (gallium nitride).

[0021] Fig. 3 is an exploded perspective view showing a schematic structural configuration of the power conversion device 1 of this embodiment. As shown in Fig. 3, the power conversion device 1 of this embodiment includes an intelligent power module 10, a main body case 11, a capacitor unit 12, a reactor unit 13, a DC-DC converter unit 14, a connector unit 15, and a motor connection bus bar 16.

[0022] In the following description, for convenience of explanation, the direction in which the DC-DC converter unit 14 and the like are positioned relative to a partition wall 31a of a center plate 31 (described later) of the main body case 11 is referred to as "upward," and the direction in which the intelligent power module 10 is positioned relative to a partition wall 31a of a center plate 31 (described later) of the main body case 11 is referred to as "downward." However, the installation posture of the power conversion device 1 is not particularly limited.

[0023] The intelligent power module 10 includes a power module 20, a gate driver board 21, an ECU board 22, etc. The power module 20 includes a plurality of power devices D having semiconductor elements, a resin power module case that houses these power devices D, etc.

[0024] The gate driver board 21 is a board on which a gate driver that generates drive signals for the step-up / step-down converter 2 and the inverter 3 formed by the power devices D is provided. Such a gate driver board 21 is stacked on the power module 20. The ECU board 22 is a board on which an ECU (Electronic Control Unit) that controls the gate driver board 21 is provided. This ECU board 22 is stacked on the gate driver board 21. Note that the gate driver board 21 and ECU board 22 may be integrated.

[0025] Such an intelligent power module 10 includes a power device D that forms the step-up / step-down converter 2 and the inverter 3. In other words, the intelligent power module 10 forms at least a part of the step-up / step-down converter 2 and the inverter 3.

[0026] The main body case 11 is a case that houses the intelligent power module 10, the capacitor unit 12, the reactor unit 13, the DC-DC converter unit 14, the connector unit 15, the motor connection bus bar 16, etc. The main body case 11 includes an upper cover 30, a center plate 31 (support plate), and a lower cover 32 (cover portion). The upper cover 30, the center plate 31, and the lower cover 32 are formed so as to be separable in the vertical direction.

[0027] The upper cover 30 is a part that covers from above the DC-DC converter unit 14 and the reactor unit 13, which are fixed from above to the center plate 31. In other words, the upper cover 30 is fastened to the center plate 31 via bolts or the like (not shown).

[0028] The central plate 31 is a support plate located between the upper cover 30 and the lower cover 32. The central plate 31 includes a flat partition wall portion 31a and a surrounding wall portion 31b that is provided so as to surround the partition wall portion 31a from the side.

[0029] The partition wall 31a is disposed so that one surface (hereinafter referred to as the upper surface 31a1) faces upward and the other surface (hereinafter referred to as the lower surface 31a2) faces downward. The lower surface 31a2 is shown in FIG. 5. The partition wall 31a supports, for example, the intelligent power module 10, the capacitor unit 12, the reactor unit 13, and the DC-DC converter unit 14.

[0030] In this embodiment, the reactor unit 13 and the DC-DC converter unit 14 are arranged above the partition wall 31a. That is, the reactor unit 13 and the DC-DC converter unit 14 are arranged to face the upper surface 31a1 of the partition wall 31a from above. Also, in this embodiment, the intelligent power module 10 is arranged below the partition wall 31a. That is, the intelligent power module 10 is arranged to face the lower surface 31a2 of the partition wall 31a from below. Also, in this embodiment, a part of the capacitor unit 12 is provided to penetrate the partition wall 31a in the vertical direction. Therefore, the partition wall 31a is provided with an insertion opening 31c through which the capacitor unit 12 is inserted.

[0031] The intelligent power module 10, the capacitor unit 12, the reactor unit 13, the DC-DC converter unit 14, and the connector unit 15 are fastened to bosses or the like provided on the partition wall portion 31a by bolts or the like (not shown).

[0032] A flow path for guiding a coolant is provided inside the partition wall 31a. By flowing the coolant through this flow path, the partition wall 31a functions as a cooling jacket, and the intelligent power module 10, the capacitor unit 12, the reactor unit 13, the DC-DC converter unit 14, and the connector unit 15 are cooled.

[0033] The surrounding wall portion 31b is provided so as to surround the intelligent power module 10, the capacitor unit 12, the reactor unit 13, and the DC-DC converter unit 14 from the sides. The surrounding wall portion 31b is connected to the edge of the partition wall portion 31a and is provided so as to protrude upward and downward from the partition wall portion 31a. The upper end of the surrounding wall portion 31b is abutted against the upper cover 30. The lower end of the surrounding wall portion 31b is abutted against the lower cover 32.

[0034] The lower cover 32 is a part that covers from below the intelligent power module 10 that is fixed from below to the central plate 31. The lower cover 32 also covers from below the capacitor unit 12 and the motor connection bus bar 16. The lower cover 32 is fastened to the central plate 31 via bolts or the like (not shown).

[0035] In this embodiment, a motor-side connector 201 provided in the motor unit 200 abuts against the lower cover 32. The motor-side connector 201 abuts against the lower cover 32 via a seal member 300. The lower cover 32 also has an opening 32a for exposing a motor-connecting AC connector 15c (see FIG. 5) of the connector unit 15, which will be described later. The motor-side connector 201 is inserted into the motor-connecting AC connector 15c through the opening 32a.

[0036] The motor unit 200 is a unit including a first motor M1 and a second motor M2. The first motor M1 and the second motor M2 are three-phase AC motors, and are driven by power supplied from the power conversion device 1 via a motor-side connector 201. The motor-side connector 201 is a six-phase connector having terminals for three phases of the first motor M1 and terminals for three phases of the second motor M2.

[0037] The capacitor unit 12 is connected to the intelligent power module 10 and is disposed to the side of the power module 20. The capacitor unit 12 is a unit including a capacitor C provided in the step-up / step-down converter 2. The capacitor unit 12 includes elements that form the capacitor C and a housing that covers these elements.

[0038] In the present embodiment, the capacitor unit 12 includes a first capacitor C1 and a second capacitor C2 included in the step-up / step-down converter 2. In the capacitor unit 12, the elements forming the first capacitor C1 are arranged inside the capacitor unit 12 so as to be located above the partition wall portion 31a. In addition, the elements forming the second capacitor C2 are arranged inside the capacitor unit 12 so as to be located below the partition wall portion 31a.

[0039] The reactor unit 13 is fixed to the center plate 31. The reactor unit 13 is connected to the intelligent power module 10 via a bus bar (not shown), and in this embodiment, is disposed above the center plate 31. The reactor unit 13 is a unit including a reactor L provided in the step-up / step-down converter 2.

[0040] The DC-DC converter unit 14 is fixed to the center plate 31. This DC-DC converter unit 14 is connected to the intelligent power module 10 via a bus bar (not shown), and in this embodiment, is disposed above the center plate 31. The DC-DC converter unit 14 is a unit that forms the DC-DC converter 4 shown in FIG. 1.

[0041] The connector unit 15 is a unit to which the motor-side connector 201 of the motor unit 200 is connected. In this embodiment, the connector unit 15 is disposed below the partition wall portion 31a of the center plate 31. The connector unit 15 is also disposed further below the intelligent power module 10. FIG. 4 is a schematic perspective view of the connector unit 15. FIG. 5 is a schematic cross-sectional view including the connector unit 15. As shown in these figures, the connector unit 15 includes a metal plate 15a, a resin plate 15b, and a motor-connecting AC connector 15c.

[0042] The metal plate 15a is a plate-shaped strength member that supports the resin plate 15b and the motor-connecting AC connector 15c. As shown in FIG. 5, the lower surface 31a2 of the partition wall portion 31a of the center plate 31 is a connector-facing surface that faces the motor-connecting AC connector 15c via the metal plate 15a and the resin plate 15b. The lower surface 31a2 of the partition wall portion 31a is provided with a plurality of bosses 33 that protrude downward from the lower surface 31a2. These bosses 33 are locations to which the connector unit 15 (i.e., the motor-connecting AC connector 15c) is fixed. The metal plate 15a is fastened to the tip of each boss 33 with a bolt 17. The metal plate 15a improves the rigidity of the connector unit 15.

[0043] It is preferable that the multiple bosses 33 have different shapes when viewed from the protruding direction (below). By having the multiple bosses 33 have different shapes, for example, an operator can easily visually identify the bosses 33. Furthermore, by having the multiple bosses 33 have different shapes, for example, it is possible to physically prevent the connector unit 15 from being fastened in a posture different from the normal mounting posture. Therefore, it is possible to prevent incorrect assembly of the connector unit 15.

[0044] Resin plate 15b is interposed between metal plate 15a and motor-connecting AC connector 15c. That is, resin plate 15b is interposed between the surface (the lower surface in this embodiment) of metal plate 15a and motor-connecting AC connector 15c. Such resin plate 15b ensures an insulation distance between motor-connecting AC connector 15c and motor-side connector 201 and metal plate 15a.

[0045] The motor-connecting AC connector 15c is a connector to which the motor-side connector 201 is connected. In this embodiment, as described above, the motor-side connector 201 is a six-phase connector. Therefore, the motor-connecting AC connector 15c connected to the motor-side connector 201 is also a six-phase connector. In other words, the motor-connecting AC connector 15c is a six-phase connector to which the first motor M1 and the second motor M2 are connected. As shown in FIG. 4, the motor-connecting AC connector 15c has insertion slots 15d corresponding to each phase. These insertion slots 15d are arranged in a straight line as shown in FIG. 4.

[0046] 5, motor-connecting AC connector 15c is fixed to boss 33 via resin plate 15b and metal plate 15a. Therefore, motor-connecting AC connector 15c is fixed to center plate 31, which is separate from lower cover 32 to which motor-side connector 201 abuts. That is, in this embodiment, center plate 31 is separate from lower cover 32 and also functions as a connector fixing portion to which motor-connecting AC connector 15c is fixed.

[0047] 5, in this embodiment, the power module 20 is supported so as to face a connector-facing surface (lower surface 31a2) which is the surface of the partition wall portion 31a provided on the center plate 31 on the motor-connecting AC connector 15c side. Furthermore, the intelligent power module 10 (i.e., the power module 20) is located between the connector-facing surface (lower surface 31a2) and the tip of the boss 33 in the protruding direction of the boss 33. In other words, the intelligent power module 10 is disposed in the space between the connector unit 15 fastened to the tip of the boss 33 from below and the partition wall portion 31a.

[0048] The motor connecting bus bars 16 are power transmission members that connect the motor connecting AC connectors 15c and the power modules 20. A motor connecting bus bar 16 is provided for each phase of the motor M. That is, in this embodiment, six motor connecting bus bars 16 are provided, one for each of the three phases of the first motor M1 and the other for each of the three phases of the second motor M2, for a total of six phases. Each motor connecting bus bar 16 connects a corresponding insertion slot 15d of the motor connecting AC connector 15c to an output terminal (not shown) of the power module 20.

[0049] The power conversion device 1 of this embodiment is connected to the motor unit 200 by connecting the motor-connecting AC connector 15c to the motor-side connector 201 of the motor unit 200. At this time, the motor-side connector 201 abuts against the lower cover 32 via the seal member 300. Therefore, the pressing force received from the motor-side connector 201 is received by the lower cover 32. Meanwhile, by connecting the motor-connecting AC connector 15c to the motor-side connector 201, the motor-connecting AC connector 15c receives a reaction force from the motor-side connector 201 side. Here, the motor-connecting AC connector 15c is fixed to the center plate 31. Therefore, the reaction force is received by the center plate 31.

[0050] The power conversion device 1 of this embodiment as described above includes a power module 20, a motor-connecting AC connector 15c, a motor-connecting bus bar 16, a lower cover 32, and a connector fixing portion (center plate 31). The power module 20 forms at least a part of a power conversion circuit H. The motor-connecting AC connector 15c is connected to a motor-side connector 201 provided in the motor M. The motor-connecting bus bar 16 connects the motor-connecting AC connector 15c and the power module 20. The motor-side connector 201 abuts against the lower cover 32 and covers the power module 20. The connector fixing portion (center plate 31) is separate from the lower cover 32 and has the motor-connecting AC connector 15c fixed thereto.

[0051] According to the power conversion device 1 of this embodiment, the motor-connecting AC connector 15c, to which the motor M is connected, is fixed to a connector fixing portion (center plate 31) separate from the lower cover 32 to which the motor-side connector 201 abuts. Therefore, the reaction force acting on the motor-connecting AC connector 15c when the motor-connecting AC connector 15c is inserted into the motor-side connector 201 is received by the connector fixing portion (center plate 31). Therefore, according to the power conversion device 1 of this embodiment, it is possible to reduce the load on the lower cover 32. Therefore, the power conversion device 1 of this embodiment, which includes the motor-connecting AC connector 15c to which the motor M is connected, can reduce the load on the lower cover 32 and reduce the rigidity of the lower cover 32. Furthermore, according to the power conversion device 1 of this embodiment, the reduced rigidity of the lower cover 32 makes it possible to achieve a small and lightweight design.

[0052] The power conversion device 1 of this embodiment also has a central plate 31 that supports the power module 20. The central plate 31 also serves as a connector fixing portion. According to this embodiment, the central plate 31, which has the rigidity to support the power module 20, can withstand the reaction force acting on the motor-connecting AC connector 15c. Therefore, the reaction force acting on the motor-connecting AC connector 15c can be stably withstood. Furthermore, by using the central plate 31 as the connector fixing portion, it is not necessary to provide the connector fixing portion as a new member. Therefore, the power conversion device 1 of this embodiment can prevent an increase in size and weight due to the provision of a connector fixing portion.

[0053] In the power converter 1 of this embodiment, the power module 20 is supported so as to face the connector-facing surface (lower surface 31a2) of the center plate 31, which is the surface on the motor-connecting AC connector 15c side.

[0054] According to the power conversion device 1 of this embodiment, the power module 20 and the motor-connecting AC connector 15c can be arranged closer to each other than when the power module 20 is located on the upper surface 31a1 side of the center plate 31. Therefore, according to the power conversion device 1 of this embodiment, the insertion slot 15d can be shortened, and the size and weight can be reduced.

[0055] In the power conversion device 1 of this embodiment, the center plate 31 has a plurality of bosses 33 that protrude from the connector-facing surface (lower surface 31a2) and to which the motor-connecting AC connector 15c is fixed. The power module 20 is located between the connector-facing surface (lower surface 31a2) and the tip of the boss 33 in the protruding direction of the boss 33.

[0056] According to the power conversion device 1 of this embodiment, the power module 20 is disposed in the space between the partition wall 31a and the connector unit 15, which is fastened from below to the tip of the boss 33. This makes it possible to effectively utilize the space between the connector unit 15 and the partition wall 31a, thereby achieving miniaturization and weight reduction.

[0057] The power converter 1 of this embodiment also includes a metal plate 15a and a resin plate 15b. The metal plate 15a is fastened to the tips of the bosses 33. The resin plate 15b is interposed between the surface of the metal plate 15a and a motor-connecting AC connector 15c. The motor-connecting AC connector 15c is fixed to the boss 33 via the resin plate 15b and the metal plate 15a.

[0058] According to the power conversion device 1 of this embodiment, the motor-connecting AC connector 15c can be stably supported by the metal plate 15a, and the motor-connecting AC connector 15c and the metal plate 15a can be insulated from each other by the resin plate 15b.

[0059] In the power converter 1 of this embodiment, the center plate 31 preferably includes bosses 33 that have different shapes when viewed from the protruding direction. According to the power converter 1 of this embodiment, it is possible to prevent incorrect assembly of the connector unit 15.

[0060] In addition, in the power conversion device 1 of this embodiment, the motor connecting AC connector 15c is a six-phase connector to which a first motor M1, which is a motor M, and a second motor M2, which is a motor M different from the first motor M1, are connected, and has insertion slots 15d arranged in a straight line.

[0061] In the power converter 1 of this embodiment, the motor-connecting AC connector 15c can be supported by a connector fixing portion separate from the lower cover 32. When the insertion slots 15d are arranged in a straight line, the motor-connecting AC connector 15c is made thinner, and the posture of the motor-connecting AC connector 15c is more likely to be unstable than when the insertion slots 15d are arranged in a parallel line. In contrast, according to the power converter 1 of this embodiment, the motor-connecting AC connector 15c is supported by a connector fixing portion separate from the lower cover 32, so that the motor-connecting AC connector 15c can be firmly fixed. Therefore, as in the power converter 1 of this embodiment, the insertion slots 15d can be arranged in a straight line, which improves the degree of freedom in the shape of the motor-connecting AC connector 15c.

[0062] While the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to the above-described embodiments. The shapes and combinations of the components shown in the above-described embodiments are merely examples, and various modifications can be made based on design requirements, etc., without departing from the spirit of the present invention.

[0063] For example, in the above embodiment, the motor-connecting AC connector 15c is a six-phase connector. However, the present invention is not limited to this. For example, the motor-connecting AC connector 15c may be a three-phase connector. In such a case, two motor-connecting AC connectors 15c may be provided. Also, the number of motors M may be one.

[0064] In the above embodiment, the power module 20 is located below the partition wall 31a. However, the present invention is not limited to this. For example, it is also possible to adopt a configuration in which the power module 20 is located above the partition wall 31a.

[0065] In the above embodiment, the power device D forming the buck-boost converter 2 is provided in the power module 20. However, the present invention is not limited to this. For example, it is also possible to adopt a configuration in which a buck-boost converter unit forming the buck-boost converter 2 is provided separately from the power module 20.

[0066] The above embodiment can also be described as follows, for example:

[0067] (Appendix 1) a power module forming at least a part of a power conversion circuit; a motor-connecting AC connector to be connected to a motor-side connector provided on the motor; a motor connection bus bar that connects the motor connection AC connector and the power module; a cover portion to which the motor-side connector is abutted and which covers the power module; a connector fixing portion that is separate from the cover portion and to which the motor-connecting AC connector is fixed; Equipped with A power conversion device characterized by:

[0068] (Appendix 2) a support plate for supporting the power module; The support plate is the connector fixing portion. 2. The power conversion device according to claim 1,

[0069] (Appendix 3) 3. The power conversion device according to claim 2, wherein the power module is supported so as to face a connector-facing surface of the support plate, which is a surface of the support plate on the side of the motor-connecting AC connector.

[0070] (Appendix 4) the support plate has a plurality of bosses formed to protrude from the connector-facing surface and to which the motor-connecting AC connector is fixed, The power module is located between the connector-facing surface and the tip of the boss in the protruding direction of the boss. 4. The power conversion device according to claim 3.

[0071] (Appendix 5) a metal plate fastened to the tips of the bosses; a resin plate interposed between the surface of the metal plate and the motor-connecting AC connector; Equipped with The motor-connecting AC connector is fixed to the boss via the resin plate and the metal plate. 5. The power conversion device according to claim 4.

[0072] (Appendix 6) 6. The power conversion device according to claim 4, wherein the support plate includes the bosses having different shapes when viewed from a protruding direction.

[0073] (Appendix 7) The power conversion device described in any one of appendices 1 to 6, characterized in that the AC connector for connecting the motor is a six-phase connector that connects a first motor that is the motor and a second motor that is different from the first motor, and has insertion slots arranged in a straight line. [Explanation of symbols]

[0074] 1...power conversion device, 2...step-up / down converter, 3...inverter, 4...DCDC converter, 10...intelligent power module, 11...main body case, 12...capacitor unit, 13...reactor unit, 14...DCDC converter unit, 15...connector unit, 15a...metal plate, 15b...resin plate, 15c...motor connection AC connector, 15d...insertion slot, 16...motor connection bus bar, 17...bolt, 20...power module, 30...upper cover, 31...center plate (support plate), 31a...partition wall portion, 31a1...upper surface, 31a2...lower surface (connector facing surface), 31b...enclosure wall portion, 31c...insertion opening, 32...lower cover, 32a...opening, 33...boss, 201...motor side connector, C...capacitor, D...power device, H...power conversion circuit, HB...high voltage battery, L...reactor, LB...low voltage battery, M...motor

Claims

1. a power module forming at least a part of a power conversion circuit; a motor-connecting AC connector to be connected to a motor-side connector provided on the motor; a motor connection bus bar that connects the motor connection AC connector and the power module; a cover portion to which the motor-side connector is abutted and which covers the power module; a connector fixing portion that is separate from the cover portion and to which the motor-connecting AC connector is fixed; Equipped with A power conversion device characterized by:

2. a support plate for supporting the power module; The support plate is the connector fixing portion.

2. The power conversion device according to claim 1.

3. 3. The power conversion device according to claim 2, wherein the power module is supported so as to face a connector-facing surface of the support plate, which is a surface of the support plate on the side of the motor-connecting AC connector.

4. the support plate has a plurality of bosses formed to protrude from the connector-facing surface and to which the motor-connecting AC connector is fixed, The power module is located between the connector-facing surface and the tip of the boss in the protruding direction of the boss.

4. The power conversion device according to claim 3.

5. a metal plate fastened to the tips of the bosses; a resin plate interposed between the surface of the metal plate and the motor-connecting AC connector; Equipped with The motor-connecting AC connector is fixed to the boss via the resin plate and the metal plate.

5. The power conversion device according to claim 4.

6. 6. The power conversion device according to claim 4, wherein the support plate has the bosses each having a different shape when viewed from a protruding direction.

7. The power conversion device according to any one of claims 1 to 5, characterized in that the AC connector for connecting the motor is a six-phase connector for connecting a first motor that is the motor and a second motor that is different from the first motor, and has insertion slots arranged in a straight line.

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