Power conversion device

Abstract

To reduce the installation space for a power conversion device.SOLUTION: A power conversion device includes a DC power connector 17 held against a central plate 31, an air conditioning equipment connector held against the central plate 31 so as to be adjacent to the DC power connector 17, and an internal bus bar 19 that connects the DC power connector 17 and the air conditioning equipment connector to at least the capacitor unit and the DCDC converter unit 14. The central plate 31 includes an enclosure wall portion 31b that surrounds a partition portion 31a from the side. The DC power connector 17 and the air conditioning equipment connector are arranged to protrude from the outer wall surface of the enclosure wall portion 31b and are formed such that a cable can be attached from a direction that is inclined with the wall surface of the partition portion 31a.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] For example, Patent Document 1 discloses a power conversion device equipped with a plurality of high-voltage connectors. The power conversion device disclosed in Patent Document 1 includes an input connector and an output connector as high-voltage connectors. The input connector is configured to be connected to a connector of a power supply wiring connected to a DC power source. The output connector is configured to be connected to a connector of a load wiring connected to an AC load such as a rotating electrical machine. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6908004 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, the power conversion device disclosed in Patent Document 1 has input and output connectors arranged side by side on the side of the case. External connectors (for example, the above-mentioned power supply wiring connector and load wiring connector) are inserted horizontally into these input and output connectors. If an external connector is inserted horizontally into the connector of the power conversion device in this way, the connector will protrude significantly to the side of the power conversion device. In addition, the external connector connected to the power conversion device will also protrude significantly to the side of the power conversion device. As a result, it becomes necessary to secure a large installation space for the power conversion device.

[0005] The present invention has been made in consideration of the above-mentioned problems, and has an object to make it possible to reduce the installation space of a power conversion device. [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 capacitor unit, a reactor unit, a DC-DC converter unit, and a power module that form a power conversion circuit; a support plate having a flat partition wall portion that supports the capacitor unit, the reactor unit, the DC-DC converter unit, and the power module; a first connector held by the support plate; a second connector held by the support plate so as to be adjacent to the first connector; and bus bars that connect the first connector and the second connector to at least the capacitor and the DC-DC converter, wherein the support plate has an enclosure wall portion that surrounds the partition wall from the side, and the first connector and the second connector are provided to protrude from an outer wall surface of the enclosure wall portion and are formed so that cables can be attached from a direction that is inclined relative to the wall surface of the partition wall. [Effects of the Invention]

[0008] In the power conversion device of the present invention, the adjacent first and second connectors are provided to protrude from the outer wall surface of the surrounding wall of the support plate, and are configured so that the cables can be attached from a direction oblique to the flat partition wall. Therefore, the amount of protrusion of the first and second connectors from the outer wall surface can be reduced compared to when the cables are attached to the first and second connectors horizontally relative to the flat partition wall. Furthermore, the amount of horizontal protrusion of the cables can be reduced compared to when the cables are attached to the first and second connectors horizontally. Therefore, the power conversion device of this embodiment can reduce the installation space when viewed from the normal direction of the partition wall. [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 cross-sectional view including a reactor unit of a power conversion device according to an embodiment of the present invention. [Figure 5] 1 is a schematic diagram of a power conversion device according to an embodiment of the present invention, in which an upper cover of a main body case is omitted. [Figure 6] FIG. 2 is a perspective view of an internal bus bar included in the power conversion device according to the embodiment of the present invention. [Figure 7] FIG. 10 is a schematic diagram showing a stress relief portion in the middle of an internal bus bar. 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 motor output connector 15, a DC-DC converter output connector 16 (output connector), a DC power connector 17 (first connector), an air conditioning equipment connector 18 (second connector), and an internal bus bar 19 (bus bar).

[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, etc. The main body case 11 includes an upper cover 30, a center plate 31 (support plate), and a lower cover 32. 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. 4. Such a 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. The partition wall 31a may directly support the intelligent power module 10, the capacitor unit 12, the reactor unit 13, and the DC-DC converter unit 14, or may indirectly support them via other portions.

[0030] In this embodiment, the reactor unit 13 and the DC-DC converter unit 14 are arranged above the partition wall 31a. Also, in this embodiment, the intelligent power module 10 is arranged below the partition wall 31a. Also, in this embodiment, a portion of the capacitor unit 12 is provided so as 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, and the DC-DC converter unit 14 are fastened to bosses or the like provided on the partition wall portion 31a by bolts or the like.

[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, and the DC-DC converter unit 14 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. The lower cover 32 is fastened to the central plate 31 via bolts or the like (not shown).

[0035] The lower cover 32 also has an opening 32a for exposing the motor output connector 15. The motor-side connector is attached to the motor output connector 15 through the opening 32a.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 4 is a schematic cross-sectional view including the reactor unit 13 in the power conversion device 1 of this embodiment. As shown in this figure, in this embodiment, the reactor unit 13 includes a reactor case 13b (case) that covers the reactor element 13a. Furthermore, the reactor case 13b includes a flange portion 13d that protrudes laterally from the lower end of the case body 13c and is fastened to the center plate 31. As such, in this embodiment, the flange portion 13d is fastened to the partition wall portion 31a of the center plate 31, thereby fastening the reactor unit 13 to the center plate 31.

[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 motor output connector 15 is a unit to which the motor-side connector is connected. In this embodiment, the motor output connector 15 is disposed below the partition wall portion 31a of the center plate 31. The motor output connector 15 is also disposed further below the intelligent power module 10. The motor output connector 15 is connected to the power module 20 via a motor connection bus bar.

[0042] The DC-DC converter output connector 16 is a connector for outputting the power output from the DC-DC converter 4 to external accessories of the power conversion device 1. FIG. 5 is a schematic diagram of the main body case 11 without the top cover 30. As shown in this figure, the surrounding wall portion 31b of the center plate 31 is formed into a rectangular shape in a plan view by connecting four side walls 31d. The four side walls 31d include long side walls 31e that form the long sides of the rectangular shape and short side walls 31f that form the short sides of the rectangular shape. The DC-DC converter output connector 16 is provided on one of the two long side walls 31e of the rectangular surrounding wall portion 31b. A connector connected to, for example, a low-voltage battery LB is attached to the DC-DC converter output connector 16. This electrically connects the DC-DC converter unit 14 and the low-voltage battery LB.

[0043] The DC power connector 17 is a connector that is connected to the high-voltage battery HB. As shown in Fig. 5, a cable CA that connects to the high-voltage battery HB is attached to the DC power connector 17. This electrically connects the power conversion device 1 and the high-voltage battery HB. As shown in Fig. 5, the DC power connector 17 is held by one of the short side walls 31f of the surrounding wall portion 31b of the center plate 31 (the short side wall 31f on the reactor unit 13 side).

[0044] The DC power connector 17 is provided to protrude from the outer wall surface of the short side wall 31f. As shown in Fig. 4, the DC power connector 17 is formed so that the cable CA can be attached from a direction inclined relative to the wall surface of the partition wall 31a. In this embodiment, the DC power connector 17 is formed so that the cable CA can be attached from diagonally below.

[0045] 5, in a plan view, the DC-DC converter unit 14 is located farther from the DC power connector 17 than the reactor unit 13. That is, in the power conversion device 1 of this embodiment, the DC-DC converter unit 14, which handles a lower voltage than the reactor unit 13, is located farther from the DC power connector 17, to which a high voltage is input, than the reactor unit 13.

[0046] The air conditioning equipment connector 18 is a connector that is connected to the air conditioning equipment. As shown in Fig. 5, a cable CB that connects to the air conditioning equipment is attached to the air conditioning equipment connector 18. This electrically connects the power conversion device 1 and the air conditioning equipment. For example, as shown in Fig. 5, the air conditioning equipment connector 18 is connected to an air conditioning equipment inverter 300 of the air conditioning equipment.

[0047] 5, the air conditioning equipment connector 18 is held by one of the short side walls 31f (the short side wall 31f on the reactor unit 13 side) of the surrounding wall portion 31b of the center plate 31. In other words, the air conditioning equipment connector 18 is held by the same short side wall 31f as the DC power connector 17. The air conditioning equipment connector 18 is positioned at a position displaced horizontally from the DC power connector 17, and is held by the center plate 31 so as to be adjacent to the DC power connector 17.

[0048] The air conditioning equipment connector 18 is provided to protrude from the outer wall surface of the short side wall 31f. The air conditioning equipment connector 18 is formed so that the cable CB can be attached from a direction that is inclined with the wall surface of the partition wall portion 31a. In this embodiment, the air conditioning equipment connector 18 is formed so that the cable CB can be attached from diagonally below. Note that in this embodiment, the DC power connector 17 and the air conditioning equipment connector 18 are formed so that the attachment angles of the cables CA and CB are the same.

[0049] In this embodiment, the air conditioning equipment connector 18 is located farther from the side wall (long side wall 31e) on which the DC-DC converter output connector 16 is provided than the DC power supply connector 17 in a plan view. Therefore, the cable CB connected to the air conditioning equipment connector 18 is routed without crossing the cable CA connected to the DC power supply connector 17 and the cable (not shown) connected to the DC-DC converter output connector 16. This makes it easier to route the cable CB connected to the air conditioning equipment connector 18.

[0050] 5, the internal bus bar 19 is disposed inside the main body case 11 (above the upper surface 31a1 of the partition wall 31a), and is a strip-shaped conductor that connects the DC power connector 17 and the air conditioning equipment connector 18 to the capacitor unit 12 and the DC-DC converter unit 14. In other words, the air conditioning equipment connector 18, the capacitor unit 12, and the DC-DC converter unit 14 are connected to the high-voltage battery HB via the DC power connector 17.

[0051] FIG. 6 is a perspective view of an internal bus bar 19. As shown in FIG. 6, the power conversion device 1 of this embodiment includes two internal bus bars 19. As shown in FIG. 5, each internal bus bar 19 is connected to a DC-DC converter unit 14 without spanning the DC-DC converter unit 14. One internal bus bar 19 is connected to the anode of the high-voltage battery HB. The other internal bus bar 19 is connected to the cathode of the high-voltage battery HB. These two internal bus bars 19 may be fitted with insulating covers as needed.

[0052] Each internal bus bar 19 has a first connection portion 19a connected to the DC power supply connector 17, a second connection portion 19b connected to the air conditioning equipment connector 18, a third connection portion 19c connected to the capacitor unit 12, and a fourth connection portion 19d connected to the DCDC converter unit 14.

[0053] 4, the first connection portion 19a is disposed at the back of the DC power connector 17 and abuts against a terminal of the cable CA attached to the DC power connector 17. The second connection portion 19b is disposed at the back of the air conditioning equipment connector 18 and abuts against a terminal of the cable CB attached to the air conditioning equipment connector 18. As shown in FIG. 4, an intermediate portion of the internal bus bar 19 is disposed above the flange portion 13d of the reactor unit 13.

[0054] 7, each internal bus bar 19 may have a stress relief portion 19e at its midpoint. The stress relief portion 19e is formed by bending a midpoint of the internal bus bar 19. Such a stress relief portion 19e is an elastically deformable portion, and can absorb stress generated when the first connection portion 19a or the second connection portion 19b is connected to a mating member by elastically deforming the stress.

[0055] In this embodiment, the internal bus bar 19 is fixed to the center plate 31 at a portion between a first connection portion 19a connected to the DC power supply connector 17 and a second connection portion 19b connected to the air conditioning equipment connector 18. Specifically, the portion between the first connection portion 19a and the second connection portion 19b is fastened to a boss or the like (not shown) provided on the center plate 31.

[0056] The power conversion device 1 of the present embodiment may include a bus bar for transmitting electric power in addition to the internal bus bar 19. For example, a bus bar that connects the capacitor unit 12 and the reactor unit 13 may be included. Furthermore, the internal bus bar 19 may have a portion that connects the capacitor unit 12 and the reactor unit 13.

[0057] In the power conversion device 1 of this embodiment, the DC power supply connector 17 is connected to the high-voltage battery HB via a cable CA, and DC power is supplied from the high-voltage battery HB. The power conversion device 1 boosts the DC power using the step-up / step-down converter 2, converts the DC power to AC using the inverter 3, and supplies the AC power to the motors M. The power conversion device 1 also converts regenerative power supplied from each motor M into DC power using the inverter 3, and reduces the voltage using the step-up / step-down converter 2 before supplying the DC power to the high-voltage battery HB.

[0058] The power conversion device 1 of this embodiment also supplies DC power supplied from the high-voltage battery HB to the air conditioning equipment via the internal bus bar 19 and the air conditioning equipment connector 18. The power conversion device 1 of this embodiment also steps down the DC power supplied from the high-voltage battery HB using the DC-DC converter 4 and supplies the power to the low-voltage battery LB.

[0059] The power conversion device 1 of this embodiment as described above includes the capacitor unit 12, the reactor unit 13, the DC-DC converter unit 14, and the power module 20. The capacitor unit 12, the reactor unit 13, the DC-DC converter unit 14, and the power module 20 form a power conversion circuit H. The power conversion device 1 of this embodiment also includes a center plate 31, a DC power connector 17, an air conditioning equipment connector 18, and an internal bus bar 19. The center plate 31 has a flat partition wall portion 31a that supports the capacitor unit 12, the reactor unit 13, the DC-DC converter unit 14, and the power module 20. The DC power connector 17 is held by the center plate 31. The air conditioning equipment connector 18 is held by the center plate 31 so as to be adjacent to the DC power connector 17. The internal bus bar 19 connects the DC power connector 17 and the air conditioning equipment connector 18 to at least the capacitor unit 12 and the DC-DC converter unit 14. The central plate 31 also includes a surrounding wall 31b that surrounds the partition wall 31a from the sides. The DC power connector 17 and the air conditioning equipment connector 18 are provided to protrude from the outer wall surface of the surrounding wall 31b, and are formed so that cables can be attached from a direction inclined relative to the wall surface of the partition wall 31a.

[0060] In the power converter 1 of this embodiment, the adjacent DC power connector 17 and air conditioning equipment connector 18 are provided to protrude from the outer wall surface of the surrounding wall portion 31b of the center plate 31, and are configured so that cables can be attached from a direction oblique to the flat partition wall portion 31a. Therefore, the amount of protrusion of the DC power connector 17 and the air conditioning equipment connector 18 from the outer wall surface can be reduced compared to when the cables are attached to the DC power connector 17 and the air conditioning equipment connector 18 horizontally relative to the flat partition wall portion 31a. Furthermore, the amount of horizontal protrusion of the cables can be reduced compared to when the cables are attached to the DC power connector 17 and the air conditioning equipment connector 18 horizontally. Therefore, the power converter of this embodiment can reduce the installation space when viewed from the normal direction of the partition wall portion 31a.

[0061] In the power conversion device 1 of this embodiment, the reactor unit 13, the DC-DC converter unit 14, and the internal bus bar 19 are arranged above the upper surface, which is one of the wall surfaces of the partition wall portion 31a. In plan view, the internal bus bar 19 is connected to the DC-DC converter unit 14 without spanning the DC-DC converter unit 14.

[0062] When the internal bus bar 19 crosses the DC-DC converter unit 14, it is necessary to install a shield plate or the like between the internal bus bar 19 and the DC-DC converter unit 14 in order to reduce noise caused by the current flowing through the internal bus bar 19. In contrast, in the power conversion device 1 of this embodiment, the internal bus bar 19 does not cross the DC-DC converter unit 14, so there is no need to install a shield plate, and it is possible to reduce the weight and cost.

[0063] In the power conversion device 1 of this embodiment, the reactor unit 13 includes a reactor case 13b that covers the reactor element 13a. The reactor case 13b also includes a flange portion 13d that protrudes laterally from the lower end of the case body 13c and is fastened to the center plate 31. The DC power connector 17 and the air conditioning equipment connector 18 are formed so that cables can be attached from diagonally below. Furthermore, a middle portion of the internal bus bar 19 is located above the flange portion 13d.

[0064] In the power converter 1 of this embodiment, the DC power connector 17 and the air conditioning equipment connector 18 are configured so that cables can be attached from diagonally below. Therefore, the inner ends of the DC power connector 17 and the air conditioning equipment connector 18 are located higher than the inlet openings of the DC power connector 17 and the air conditioning equipment connector 18. Therefore, in the power converter 1 of this embodiment, the internal bus bar 19 can be disposed higher than in a case where cables are attached to the DC power connector 17 and the air conditioning equipment connector 18 from a horizontal direction, and a portion of the internal bus bar 19 can be located above the flange portion 13d of the reactor unit 13. By positioning the middle portion of the internal bus bar 19 above the flange portion 13d in this way, the shape of the power converter 1 in a plan view can be made smaller.

[0065] In the power conversion device 1 of this embodiment, the internal bus bar 19 has a first connection portion 19a that connects to the DC power supply connector 17 and a second connection portion 19b that connects to the air conditioning equipment connector 18. The portion between the first connection portion 19a and the second connection portion 19b is fixed to the center plate 31.

[0066] For example, by fixing a portion near the first connection portion 19a to the center plate 31, it is possible to prevent the first connection portion 19a and the terminal of the cable CA attached to the DC power connector 17 from becoming separated due to vibrations of the vehicle 100, etc. Similarly, by fixing a portion near the second connection portion 19b to the center plate 31, it is possible to prevent the second connection portion 19b and the terminal of the cable CB attached to the air conditioning equipment connector 18 from becoming separated due to vibrations of the vehicle 100, etc. In this embodiment, because the portion between the first connection portion 19a and the second connection portion 19b is fixed to the center plate 31, it is possible to prevent both the first connection portion 19a and the second connection portion 19b from becoming separated from the terminal of the cable at a single fixing point.

[0067] Furthermore, in the power converter 1 of this embodiment, the internal bus bar 19 has a stress relief portion 19e formed by bending an intermediate portion thereof. According to the power converter 1 of this embodiment, the stress generated when the first connection portion 19a or the second connection portion 19b comes into contact with the cable terminal from diagonally below can be absorbed by elastic deformation.

[0068] Furthermore, in the power conversion device 1 of this embodiment, the DC-DC converter unit 14 is located farther from the DC power connector 17 than the reactor unit 13 in a plan view. According to the power conversion device 1 of this embodiment, the DC-DC converter unit 14, which handles a lower voltage than the reactor unit 13, is located farther from the DC power connector 17, to which a high voltage is input, than the reactor unit 13. This allows the internal bus bar 19 to be shortened.

[0069] In the power conversion device 1 of this embodiment, the surrounding wall 31b is formed in a rectangular shape in a plan view. The DC power supply connector 17 and the air conditioning equipment connector 18 are provided on a side wall 31d of the surrounding wall 31b, which corresponds to one side of the rectangle. The DC-DC converter output connector 16 of the DC-DC converter unit 14 is provided on a long side wall 31e connected to a short side wall 31f on which the DC power supply connector 17 and the air conditioning equipment connector 18 are provided. The air conditioning equipment connector 18 is an air conditioning equipment connector that is connected to an air conditioning equipment inverter 300, and is located farther from the long side wall 31e on which the DC-DC converter output connector 16 is provided than the DC power supply connector 17 is in a plan view.

[0070] According to the power conversion device 1 of this embodiment, the cable CB connected to the air conditioning equipment connector 18 can be routed so as to cross, in plan view, the cable CA connected to the DC power supply connector 17 and a cable (not shown) connected to the DC-DC converter output connector 16. This makes it easy to route the cable CB connected to the air conditioning equipment connector 18.

[0071] 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.

[0072] For example, in the above embodiment, a configuration has been described in which cables can be attached to the DC power supply connector 17 and the air conditioning equipment connector 18 from diagonally below. However, the present invention is not limited to this, and a configuration in which cables can be attached to the DC power supply connector 17 and the air conditioning equipment connector 18 from diagonally above is also possible.

[0073] In the above embodiment, the first connector is the DC power connector 17, and the second connector is the air conditioning equipment connector 18. However, the present invention is not limited to this. The adjacent first and second connectors may be connectors of other types.

[0074] The above embodiment can also be described as follows, for example:

[0075] (Appendix 1) A capacitor unit, a reactor unit, a DC-DC converter unit, and a power module that form a power conversion circuit; a support plate having a flat partition wall portion that supports the capacitor unit, the reactor unit, the DC-DC converter unit, and the power module; a first connector held against the support plate; a second connector held against the support plate so as to be adjacent to the first connector; bus bars connecting the first connector and the second connector to at least the capacitor unit and the DC-DC converter unit; Equipped with the support plate includes a surrounding wall portion that surrounds the partition wall portion from a side, The first connector and the second connector are provided to protrude from the outer wall surface of the surrounding wall portion, and are formed so that a cable can be attached from a direction inclined relative to the wall surface of the partition portion. A power conversion device characterized by:

[0076] (Appendix 2) the reactor unit, the DC-DC converter unit, and the bus bar are disposed above an upper surface, which is one of the wall surfaces, of the partition wall portion; In a plan view, the bus bar is connected to the DC-DC converter unit without spanning the DC-DC converter unit. 2. The power conversion device according to claim 1,

[0077] (Appendix 3) The reactor unit includes a case that covers a reactor element, the case includes a flange portion that protrudes laterally from a lower end of the case body and is fastened to the support plate; the first connector and the second connector are formed so that the cable can be attached from diagonally below, The intermediate portion of the bus bar is located above the flange portion. 3. The power conversion device according to claim 1 or 2.

[0078] (Appendix 4) The power conversion device described in any one of appendices 1 to 3, characterized in that the bus bar has a first connection portion that connects to the first connector and a second connection portion that connects to the second connector, and a portion between the first connection portion and the second connection portion is fixed to the support plate.

[0079] (Appendix 5) 5. The power converter according to claim 1, wherein the bus bar has a stress relaxation portion formed by curving an intermediate portion thereof.

[0080] (Appendix 6) the first connector is a DC power connector connected to a battery, In a plan view, the DC-DC converter unit is located farther from the DC power connector than the reactor unit. 6. The power conversion device according to any one of claims 1 to 5.

[0081] (Appendix 7) The surrounding wall portion is formed in a rectangular shape in a plan view, the first connector and the second connector are provided on a side wall of the surrounding wall portion corresponding to one side of the rectangular shape, an output connector of the DC-DC converter unit is provided on another side wall connected to the side wall on which the first connector and the second connector are provided, The second connector is a connector for air conditioning equipment that is connected to an inverter for air conditioning equipment, and is located farther from the side wall on which the output connector is provided than the first connector in a plan view. 7. The power conversion device according to claim 6, [Explanation of symbols]

[0082] 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, 13a...reactor element, 13b...reactor case, 13c...case main body, 13d...flange portion, 14...DCDC converter unit, 15...motor output connector, 16...DCDC converter output connector, 17...DC power connector (first connector), 18...air conditioning equipment connector (second connector), 19...internal bus bar (bus bar), 19a...first connection portion, 19b...second connection portion Connection portion, 19c...third connection portion, 19d...fourth connection portion, 19e...stress relief portion, 20...power module, 30...upper cover, 31...center plate (support plate), 31a...partition portion, 31a1...upper surface, 31a2...lower surface, 31b...enclosure portion, 31c...insertion opening, 31d...side wall, 31e...long side wall, 31f...short side wall, 32...lower cover, 32a...opening, 100...vehicle, 300...air conditioning equipment inverter, C...capacitor, CA...cable, CB...cable, D...power device, H...power conversion circuit, HB...high voltage battery, L...reactor, LB...low voltage battery, M...motor

Claims

1. a capacitor unit, a reactor unit, a DC-DC converter unit, and a power module that form a power conversion circuit; a support plate having a flat partition wall portion that supports the capacitor unit, the reactor unit, the DC-DC converter unit, and the power module; a first connector held against the support plate; a second connector held against the support plate so as to be adjacent to the first connector; bus bars connecting the first connector and the second connector to at least the capacitor unit and the DCDC converter unit; Equipped with the support plate includes a surrounding wall portion that surrounds the partition wall portion from a side, The first connector and the second connector are provided to protrude from the outer wall surface of the surrounding wall portion, and are formed so that a cable can be attached from a direction inclined relative to the wall surface of the partition wall portion. A power conversion device characterized by:

2. the reactor unit, the DC-DC converter unit, and the bus bar are disposed above an upper surface, which is one of the wall surfaces, of the partition wall portion; In a plan view, the bus bar is connected to the DC-DC converter unit without spanning the DC-DC converter unit.

2. The power conversion device according to claim 1.

3. The reactor unit includes a case that covers a reactor element, the case includes a flange portion that protrudes laterally from a lower end of the case body and is fastened to the support plate; the first connector and the second connector are formed so that the cable can be attached from diagonally below, The intermediate portion of the bus bar is located above the flange portion.

3. The power conversion device according to claim 1 or 2.

4. 3. The power conversion device according to claim 1, wherein the bus bar has a first connection portion that connects to the first connector and a second connection portion that connects to the second connector, and a portion between the first connection portion and the second connection portion is fixed to the support plate.

5. 3. The power converter according to claim 1, wherein the bus bar has a stress relief portion formed by curving an intermediate portion thereof.

6. the first connector is a DC power connector connected to a battery, In a plan view, the DC-DC converter unit is located farther from the DC power connector than the reactor unit.

3. The power conversion device according to claim 1 or 2.

7. The surrounding wall portion is formed in a rectangular shape in a plan view, the first connector and the second connector are provided on a side wall of the surrounding wall portion corresponding to one side of the rectangular shape, an output connector of the DC-DC converter unit is provided on another side wall connected to the side wall on which the first connector and the second connector are provided, The second connector is an air conditioning equipment connector that is connected to an inverter for air conditioning equipment, and is located farther from the side wall on which the output connector is provided than the first connector in a plan view.

7. The power conversion device according to claim 6.

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