Power conversion device

Abstract

To provide a power conversion device that enables wiring to be easily arranged while ensuring insulation when electrically connecting a DC-DC converter unit and a DC power source that are arranged at a distance from each other via an intervening object at one side and the other side within the power conversion device.SOLUTION: A power conversion device 100 includes a DC-DC converter unit 20 that transforms DC power input from a DC power source 200, an inverter unit 10 that is provided opposite the DC-DC converter unit 20 and converts the DC power transformed by the DC-DC converter unit 20 into AC power and supplies it to a load 210, a capacitor C1 that is provided on the inverter unit 10 side and connected to the DC-DC converter unit 20, and a first bus bar 60 that is provided in an insulating housing 40 that houses the capacitor C1 and serves as wiring that electrically connects the DC-DC converter unit 20 and the DC power source 200 provided on the inverter unit 10 side.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The present invention relates to a power conversion device, and more particularly to a power conversion device including a DC / DC converter section and an inverter section disposed opposite to the DC / DC converter section. [Background technology]

[0002] 2. Description of the Related Art Conventionally, there is known a power conversion device including a DC-DC converter section and an inverter section disposed at a position opposite to the DC-DC converter section (see, for example, Patent Document 1).

[0003] The above-mentioned Patent Document 1 discloses a power conversion device including a DC-DC converter unit and an inverter unit. In the configuration disclosed in the above-mentioned Patent Document 1, the DC-DC converter unit and the inverter unit are arranged in positions facing each other. The above-mentioned Patent Document 1 also discloses a configuration in which the DC-DC converter unit transforms DC power input from a DC power source and supplies the transformed power to the inverter unit. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2023-53944 A Summary of the Invention [Problem to be solved by the invention]

[0005] Here, the above Patent Document 1 does not disclose the arrangement of the DC power supply, but in a configuration in which the DC-DC converter unit and the inverter unit in the power conversion device are arranged at a distance from each other via an intervening member such as a cooling unit that cools the DC-DC converter unit and the inverter unit, the DC power supply may be arranged on the inverter unit side. In this case, it is difficult to arrange the wiring that electrically connects the DC power supply and the DC-DC converter unit arranged at a distance from each other via an intervening member such as a cooling unit. In addition, it is possible to electrically connect the DC-DC converter unit and the DC power supply using a bus bar as a wiring that electrically connects them. However, when the DC-DC converter unit and the DC power supply are arranged at positions separated from each other via an intervening member, it is necessary to arrange the bus bar after ensuring insulation so that no current flows from the bus bar to the intervening member. Therefore, when electrically connecting the DC-DC converter unit and the DC power supply arranged at a distance from each other via an intervening member at one side and the other side positions in the power conversion device, it is desired to easily arrange the wiring while ensuring insulation.

[0006] The present invention has been made to solve the above-mentioned problems, and one object of the present invention is to provide a power conversion device that enables easy wiring arrangement while ensuring insulation when electrically connecting a DC-DC converter unit and a DC power source that are arranged at a distance from each other via an intermediary object at one side and the other side of the power conversion device. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, a power conversion device according to one aspect of the present invention includes a DC-DC converter unit that transforms DC power input from a DC power source, an inverter unit provided opposite the DC-DC converter unit and that converts the DC power transformed by the DC-DC converter unit into AC power and supplies it to a load, a capacitor provided on the inverter unit side and connected to the DC-DC converter unit, and a first bus bar as wiring provided in an insulating housing that houses the capacitor and electrically connects the DC-DC converter unit to the DC power source provided on the inverter unit side.

[0008] As described above, the power conversion device according to one aspect of the present invention includes a first bus bar disposed in an insulating housing that houses a capacitor and serves as wiring that electrically connects the DC-DC converter unit and the DC power supply provided on the inverter unit side. Since the first bus bar is disposed in the housing that houses the insulating capacitor, unlike a configuration in which the first bus bar is disposed in a non-insulating member, the first bus bar can be disposed on the housing after ensuring insulation without insulating the first bus bar itself. Furthermore, since the DC-DC converter unit and the DC power supply are electrically connected by the first bus bar disposed in the housing, the DC-DC converter unit and the DC power supply that are disposed apart from each other via an intervening object can be easily disposed at positions on one side and the other side in the power conversion device. As a result, when electrically connecting the DC-DC converter unit and the DC power supply that are disposed apart from each other via an intervening object at positions on one side and the other side in the power conversion device, wiring can be easily disposed after ensuring insulation.

[0009] The power conversion device according to the above aspect preferably further includes a cooling unit disposed between the inverter unit and the DC-DC converter unit and configured to cool the inverter unit and the DC-DC converter unit, the DC-DC converter unit being disposed on one side of the cooling unit, and the DC power supply and the inverter unit being disposed on the other side of the cooling unit. With this configuration, the first bus bar can be stably disposed in a configuration in which the inverter unit and the DC-DC converter unit disposed in opposing positions are cooled by the cooling unit. As a result, in a power conversion device in which the inverter unit and the DC-DC converter unit disposed in opposing positions are cooled by the cooling unit, wiring can be easily disposed when electrically connecting the DC-DC converter unit and the DC power supply while ensuring insulation.

[0010] In this case, the housing is preferably made of an insulating resin material and has a groove on its outer surface, and the first bus bar is disposed in the groove. With this configuration, by disposing the first bus bar in the groove of the housing made of an insulating resin material, the first bus bar can be easily insulated without covering the first bus bar itself with an insulating member.

[0011] In the above-described configuration in which the first busbar is disposed in a groove of a housing formed from an insulating resin material, the groove preferably has a groove width larger than the thickness of the first busbar, and has an abutment portion that abuts against the first busbar on an inner surface of the groove. With this configuration, since the groove width is larger than the thickness of the first busbar, the first busbar can be easily disposed in the groove. Furthermore, since the inner surface of the groove has an abutment portion that abuts against the first busbar, it is possible to prevent the position of the first busbar from shifting after the first busbar is disposed in the groove. As a result, it is possible to prevent the position of the first busbar from shifting while ensuring ease of assembly when disposing the first busbar in the groove.

[0012] In this case, the abutment portion preferably includes a plurality of abutment portions arranged at different positions in the extension direction of the groove on both widthwise inner surfaces of the groove. With this configuration, the abutment portions abut the first bus bar on both widthwise sides of the groove and at different positions in the extension direction of the groove, making it possible to easily and reliably suppress misalignment of the first bus bar.

[0013] In the configuration including a plurality of abutment portions arranged at different positions in the extending direction of the groove portion on the inner side surface of the groove portion in the width direction, the groove portion is preferably provided on the housing so as to be adjacent to the portion of the housing that houses the capacitor. With this configuration, it is possible to prevent the thickness of the housing that houses the capacitor from increasing in size, compared to a configuration in which the groove portion is formed outside the portion that houses the capacitor. As a result, it is possible to prevent the housing that houses the capacitor from increasing in size, and therefore to prevent the power conversion device from increasing in size.

[0014] In this case, preferably, the DC power supply has an input terminal provided on the inverter unit side, the first bus bar includes a positive bus bar electrically connected to the positive terminal of the input terminal and a negative bus bar electrically connected to the negative terminal of the input terminal, and the groove includes a first groove in which the positive bus bar is disposed and a second groove in which the negative bus bar is disposed. With this configuration, the positive bus bar and the negative bus bar can be easily insulated from each other by disposing the positive bus bar in the first groove and the negative bus bar in the second groove. As a result, even when the first bus bar includes a plurality of bus bars, each bus bar can be easily insulated from each other.

[0015] In the above-mentioned configuration in which the first busbar includes a positive busbar and a negative busbar and the groove includes a first groove in which the positive busbar is disposed and a second groove in which the negative busbar is disposed, preferably, the DC-DC converter unit includes a step-down converter unit that steps down the DC power, and further includes an output terminal from which the DC power stepped down by the step-down converter unit is output, and a second busbar electrically connected to the output terminal, and the groove further includes a third groove in which the second busbar is disposed. With this configuration, when the step-down converter unit and the output terminal are electrically connected by the second busbar, the second busbar can be easily disposed while being insulated.

[0016] In this case, preferably, the DC-DC converter section includes a boost converter section that boosts the DC power and further includes a third bus bar that electrically connects the boost converter section and the capacitor, and the housing has a third bus bar fixing section to which the third bus bar is fixed. With this configuration, not only the first bus bar but also the third bus bar can be arranged in the housing that houses the capacitor. Therefore, compared to a configuration in which the third bus bar is arranged in a position different from the housing that houses the capacitor, the arrangement of the third bus bar and the first bus bar can be consolidated in the housing. As a result, it is possible to prevent the arrangement of the third bus bar from becoming complicated. Effect of the Invention

[0017] According to the present invention, as described above, when electrically connecting a DC-DC converter unit and a DC power source that are arranged at a distance from each other via an intervening object at one side and the other side of a power conversion device, wiring can be easily arranged while ensuring insulation. [Brief description of the drawings]

[0018] [Figure 1] 1 is a circuit diagram of a power conversion device according to an embodiment. [Diagram 2] 1 is a perspective view of a power converter according to one embodiment; [Diagram 3] 1 is a side view of a power converter according to one embodiment; [Figure 4] 4 is an enlarged perspective view of a groove in which a bus bar of a power converter according to an embodiment is arranged. FIG. [Diagram 5] 2 is a perspective view showing a first bus bar and a second bus bar included in a power conversion device according to one embodiment. FIG. [Figure 6] 2 is a side view showing a first bus bar and a second bus bar included in the power conversion device according to one embodiment. FIG. [Figure 7] 4 is an enlarged front view of a groove in which a bus bar of a power conversion device according to an embodiment is arranged. FIG. [Figure 8] 2 is a top view showing a first bus bar and a second bus bar included in a power conversion device according to one embodiment. FIG. [Figure 9] 4 is an enlarged top view of a groove in which a bus bar of a power conversion device according to an embodiment is arranged. FIG. [Figure 10] 1 is a perspective view showing a state in which a first bus bar and a second bus bar are arranged and a third bus bar is fixed to a housing of a capacitor included in a power conversion device according to one embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

[0020] The configuration of a power conversion device 100 according to one embodiment of the present invention will be described with reference to Figures 1 to 10. The power conversion device 100 is mounted on a vehicle, for example.

[0021] First, the circuit configuration of a power conversion device 100 will be described with reference to Fig. 1. The power conversion device 100 includes an input terminal 1 and an output terminal 2. The power conversion device 100 also includes an inverter unit 10, a DC-DC converter unit 20, a capacitor C1, and a DC power supply 200. The power conversion device 100 also includes a resistor R. The power conversion device 100 also includes a first bus bar 60 (see Fig. 5) as wiring that electrically connects the DC-DC converter unit 20 and the DC power supply 200.

[0022] The inverter unit 10 converts the DC power transformed by the DC-DC converter unit 20 into AC power and supplies the AC power to a load 210. The load 210 is, for example, a motor. A switch 201 is provided between the power conversion device 100 and the DC power supply 200.

[0023] The inverter unit 10 includes a switching element module 11. The switching element module 11 converts DC power into AC power. The switching element module 11 also includes semiconductor switching elements Q1, Q2, and Q3 that form an upper arm, and semiconductor switching elements Q4, Q5, and Q6 that form a lower arm.

[0024] The inverter unit 10 includes a first inverter unit 10a and a second inverter unit 10b. The switching element module 11 includes a first switching element module 11a included in the first inverter unit 10a and a second switching element module 11b included in the second inverter unit 10b. The load 210 includes a first load 210a and a second load 210b. The first inverter unit 10a converts DC power input from the DC power source 200 into AC power and supplies it to the first load 210a. The second inverter unit 10b converts DC power input from the DC power source 200 into AC power and supplies it to the second load 210b.

[0025] The DC-DC converter unit 20 transforms the DC power input from the DC power supply 200. In this embodiment, the DC-DC converter unit 20 includes a DCDC converter unit 21 and a boost converter unit 22. The DCDC converter unit 21 is an example of a "step-down capacitor unit" in the claims.

[0026] The DCDC converter unit 21 converts the voltage of DC power into a different voltage. Specifically, the DCDC converter unit 21 steps down the voltage of the DC power input from the DC power source 200 via the input terminal 1. The DCDC converter unit 21 also supplies the stepped-down voltage to the output terminal 2.

[0027] The boost converter unit 22 is disposed on the input side of the inverter unit 10. The boost converter unit 22 boosts the DC power input from the DC power source 200 and supplies the boosted power to the inverter unit 10. The boost converter unit 22 includes a boost switching element module 22a and a reactor 22b. The boost switching element module 22a includes boost switching elements Q11 and Q12. The boost switching elements Q11 and Q12 form an upper arm and a lower arm, respectively. The boost converter unit 22 also includes a capacitor C2. The reactor 22b is provided between the positive side of the DC power source 200 and a connection point between the boost switching element Q11 and the boost switching element Q12. The capacitor C2 is provided in parallel with the boost switching element Q12.

[0028] The capacitor C1 is connected to the DC-DC converter unit 20. In this embodiment, the capacitor C1 is provided between the boost converter unit 22 and the inverter unit 10. In this embodiment, the resistor R is provided between the boost converter unit 22 and the inverter unit 10. The capacitor C1 and the resistor R are provided in parallel with each other.

[0029] The DC power supply 200 has an input terminal 1 provided on the inverter unit 10 side. The input terminal 1 includes a positive terminal 1a and a negative terminal 1b.

[0030] The output terminal 2 outputs DC power stepped down by the DC-DC converter unit 21. The output terminal 2 is also connected to a control device (not shown) or the like.

[0031] Next, the structure of the power conversion device 100 will be described.

[0032] In this embodiment, as shown in FIG. 2, the DCDC converter unit 21 includes a DC-DC converter element 23 and a DC-DC converter board 24 on which the DC-DC converter element 23 is mounted. The DC-DC converter board 24 has a flat plate shape. The DC-DC converter element 23 mounted on the DC-DC converter board 24 includes a converter switching element 23a, a transformer 23b, a resonant reactor 23c, and a smoothing reactor 23d. In this specification, the front-back direction of the DC-DC converter board 24 is defined as the Z direction. In addition, in the Z direction, the direction from the back surface to the front surface of the DC-DC converter board 24 is defined as the Z1 direction, and the direction from the front surface to the back surface of the DC-DC converter board 24 is defined as the Z2 direction. In addition, of two directions mutually perpendicular to the Z direction, one direction is defined as the X direction, and the other direction is defined as the Y direction. In addition, one direction of the X direction is defined as the X1 direction, and the other direction is defined as the X2 direction. Moreover, one direction in the Y direction is defined as a Y1 direction, and the other direction is defined as a Y2 direction.

[0033] The converter switching element 23a is provided on the back surface side (Z2 direction side) of the DC-DC converter board 24. The transformer 23b, the resonant reactor 23c, and the smoothing reactor 23d are provided to penetrate the DC-DC converter board 24.

[0034] As shown in FIG. 2, the power conversion device 100 includes a cooling unit 50. The cooling unit 50 is flat. The cooling unit 50 is disposed between the inverter unit 10 (see FIG. 1) and the DC-DC converter unit 20 (see FIG. 1). The cooling unit 50 is formed of a metal having relatively high thermal conductivity, such as aluminum. The cooling unit 50 has a rectangular shape when viewed from a direction perpendicular to the front surface (front surface (surface on the Z1 direction side)) and back surface (back surface (surface on the Z2 direction side)) of the cooling unit 50. The cooling unit 50 includes a cooling flow passage 51 (see FIG. 3) through which a cooling liquid flows. In the example shown in FIG. 2, the power conversion device 100 is illustrated so that the longitudinal direction of the cooling unit 50 is along the X direction and the short side direction is along the Y direction.

[0035] In this embodiment, the switching element module 11 (see FIG. 3) of the inverter section 10 is attached to the cooling section 50 so as to follow the front or back surface of the flat cooling section 50. Also, the DC-DC converter board 24 on which the DC-DC converter element 23 is mounted is attached to the cooling section 50 so as to follow the front or back surface of the flat cooling section 50.

[0036] Specifically, in this embodiment, the switching element module 11 is attached to the cooling unit 50 so as to fit along the back surface of the flat cooling unit 50. That is, the inverter unit 10 is provided on the other side (Z2 direction side) of the cooling unit 50. Also, the DC-DC converter board 24 on which the DC-DC converter element 23 is mounted is attached to the cooling unit 50 so as to fit along the front surface of the flat cooling unit 50.

[0037] The DC-DC converter unit 21 includes a capacitor C2 connection terminal connected to the capacitor C2 (see FIG. 1). The capacitor C2 connection terminal is disposed on at least one side of the longitudinal end of the cooling unit 50 opposite to the other side where the inverter output terminals of the first switching element module 11a and the second switching element module 11b are disposed.

[0038] In this embodiment, the boost converter unit 22 is attached to the cooling unit 50 so as to be aligned along the front or back surface of the flat-plate cooling unit 50. Specifically, the boost converter unit 22 is attached to the front surface of the cooling unit 50. The boost converter unit 22 is also disposed adjacent to the DCDC converter unit 21 along the longitudinal direction (X direction) of the flat-plate cooling unit 50.

[0039] In this embodiment, the boost switching element module 22a and the reactor 22b are attached to the cooling unit 50 so as to be aligned along the front or back surface of the flat cooling unit 50. Specifically, the DC-DC converter board 24, the reactor 22b, and the boost switching element module 22a are attached to the cooling unit 50 so as to be aligned along the front surface of the flat cooling unit 50 and adjacent to each other. The DC-DC converter board 24, the reactor 22b, and the boost switching element module 22a are attached to the front surface of the cooling unit 50 in this order.

[0040] 2, the capacitor C1 is attached to the cooling unit 50 so as to be aligned along the front or back surface of the flat cooling unit 50. Specifically, the capacitor C1 is attached to the back surface of the cooling unit 50. That is, the capacitor C1 is disposed on the inverter unit 10 side (Z2 direction side).

[0041] 2, the DC power supply 200 is also disposed on the inverter unit 10 side (Z2 direction side). That is, the DC power supply 200 is provided on the other side (Z2 direction side) of the cooling unit 50. In this embodiment, the DC power supply 200 is disposed at a position on the inverter unit 10 side, separated from the DC-DC converter unit 20 via the cooling unit 5.

[0042] 3, cooling flow passage 51 is formed so that cooling liquid alternately passes through the front surface and the back surface of cooling unit 50. Specifically, cooling flow passage 51 is arranged on the front side (front surface side) and includes cooling flow passages 511, 515, and 519 as front-side flow passages, and cooling flow passages 513 and 517 as back-side flow passages arranged on the back side (back surface side), and cooling flow passages 512, 514, 516, and 518 as connecting flow passages. Cooling flow passage 51 is formed so that cooling fluid flows in from one end side in the longitudinal direction (X direction) of cooling unit 50 and flows out from the other end side.

[0043] In the cooling flow passage 51, cooling flow passages 511, 512, 513, 514, 515, 516, 517, 518, and 519 are connected in this order from upstream to downstream. That is, as shown in Fig. 3, the cooling liquid flows into the cooling flow passage 51 from the cooling flow passage 511 of the front side flow passage, passes through the cooling flow passage 512 of the connection flow passage, the cooling flow passage 513 of the back side flow passage, the cooling flow passage 514 of the connection flow passage, the cooling flow passage 515 of the front side flow passage, the cooling flow passage 516 of the connection flow passage, the cooling flow passage 517 of the back side flow passage, the cooling flow passage 518 of the connection flow passage, and the cooling flow passage 519 of the front side flow passage, and flows out. The inlet through which the cooling liquid flows in and the outlet through which the cooling liquid flows out of the cooling flow passage 51 may be disposed at the center of the short side direction of the cooling section 50. By arranging in this manner, in the power conversion device 100 shown in Figure 2, whether the surface on which the DCDC converter unit 21 is arranged is the upper surface or the lower surface when it is fitted into the customer's equipment, the positions of the inlet through which the cooling liquid flows in and the outlet through which the cooling liquid flows out do not change, so there is no need for the customer to change the piping arrangement of the cooling liquid.

[0044] The cooling liquid flowing out of the cooling flow passage 51 is cooled by dissipating heat by the heat dissipation unit 3. The cooling liquid cooled by the heat dissipation unit 3 is pumped by the pump 4 and flows back into the cooling flow passage 51. The heat dissipation unit 3 includes a heat exchanger and is cooled by external air. The heat dissipation unit 3 is, for example, a radiator. The pump 4 may be disposed between the outlet of the cooling flow passage 51 and the heat dissipation unit 3, and the cooling liquid before dissipating heat by the heat dissipation unit 3 may be pumped by the pump 4. The cooling liquid is, for example, water, antifreeze, or other liquid.

[0045] 3, the inverter unit 10 (see FIG. 1) is disposed on the back side of the cooling unit 50. That is, the inverter unit 10 is provided on the other side (Z2 direction side) of the cooling unit 50. The inverter unit 10 is cooled by the cooling liquid flowing through the back side flow paths (cooling flow paths 513 and 517). In this embodiment, the first switching element module 11a and the second switching element module 11b are disposed on the back side of the cooling unit 50 and are cooled by the cooling liquid flowing through the back side flow paths.

[0046] The DC-DC converter unit 21 is disposed on the front side of the cooling unit 50, and is cooled by the cooling liquid flowing through the front side passages (cooling passages 511, 515, and 519). Specifically, the converter switching element 23a, the transformer 23b, the resonant reactor 23c, and the smoothing reactor 23d are disposed on the front side of the cooling unit 50, and are cooled by the cooling liquid flowing through the front side passages.

[0047] Moreover, the boost converter unit 22 is disposed on the front side of the cooling unit 50, and is cooled by the cooling liquid flowing through the front side flow paths (cooling flow paths 511, 515, and 519). Specifically, the boost switching element module 22a and the reactor 22b are disposed on the front side of the cooling unit 50, and are cooled by the cooling liquid flowing through the front side flow paths. That is, in this embodiment, the DC-DC converter unit 20 (see FIG. 1) is provided on one side (Z1 direction side) of the cooling unit 50. Also, in this embodiment, the inverter unit 10 is provided at a position facing the DC-DC converter unit 20.

[0048] In this embodiment, the first bus bar 60 (see Figure 5) is arranged in a groove portion 41 (see Figure 4) of the housing 40 (see Figure 4) so ​​as to electrically connect the DC power supply 200 provided on the other side (Z2 direction side) of the cooling section 50 and the DC-DC converter section 20 provided on one side (Z1 direction side) of the cooling section 50.

[0049] (Groove) 4, the housing 40 is made of an insulating resin material. The housing 40 has a groove 41 on an outer surface 40a. In this embodiment, the groove 41 is provided in the housing 40 so as to be adjacent to a portion 40b of the housing 40 that houses the capacitor C1. Specifically, the groove 41 is provided on the X1 direction side of the portion 40b of the housing 40 that houses the capacitor C1.

[0050] 4, groove portion 41 includes a plurality of groove portions. In this embodiment, groove portion 41 includes a first groove portion 41a, a second groove portion 41b, and a third groove portion 41c. First groove portion 41a to third groove portion 41c are groove portions in which a positive side bus bar 60a (see FIG. 5), a negative side bus bar 60b (see FIG. 5), and a second bus bar 61, which will be described later, are arranged. The first groove portion 41a to third groove portion 41c will be described in detail later.

[0051] Furthermore, a plurality of protrusions 40c are provided at positions facing the first groove portion 41a in the housing 40. The details of the plurality of protrusions 40c will be described later.

[0052] (First bus bar and second bus bar) As shown in Fig. 5, the power conversion device 100 (see Fig. 1) is disposed in an insulating housing 40 that houses a capacitor C1 (see Fig. 1), and includes a first bus bar 60 as wiring that electrically connects the DC-DC converter unit 20 (see Fig. 1) and a DC power supply 200 (see Fig. 1) provided on the inverter unit 10 (see Fig. 1) side. In this embodiment, the first bus bar 60 includes a positive side bus bar 60a and a negative side bus bar 60b.

[0053] The positive bus bar 60a is electrically connected to the positive terminal 1a of the input terminal 1 (see FIG. 1), and the negative bus bar 60b is electrically connected to the negative terminal 1b of the input terminal 1.

[0054] Moreover, the power conversion device 100 includes a second bus bar 61 electrically connected to the output terminal 2 .

[0055] The positive bus bar 60a includes a first connection terminal portion 160a, a second connection terminal portion 160b, and a third connection terminal portion 160c. The first connection terminal portion 160a is provided on the Z2 direction side of the positive bus bar 60a and is connected to the positive terminal 1a of the DC power supply 200. The second connection terminal portion 160b is provided on the Z1 direction side of the positive bus bar 60a and is connected to the positive terminal of the DC-DC converter portion 21. The third connection terminal portion 160c is provided on the Z1 direction side of the positive bus bar 60a and is connected to the reactor 22b.

[0056] 5, positive bus bar 60a has a plurality of bent portions 170 between first connection terminal portion 160a and second connection terminal portion 160b and third connection terminal portion 160c. In the example shown in FIG. 5, positive bus bar 60a has four bent portions 170.

[0057] The negative bus bar 60b includes a first connection terminal portion 161a and a second connection terminal portion 161b. The first connection terminal portion 161a is provided on the Z2 direction side of the negative bus bar 60b and is connected to the negative terminal 1b of the DC power supply 200. The second connection terminal portion 161b is provided on the Z1 direction side of the negative bus bar 60b and is connected to the negative terminal of the DC-DC converter unit 21.

[0058] 5, negative bus bar 60b has a plurality of bent portions 171 between first connection terminal portion 161a and second connection terminal portion 161b. In the example shown in FIG. 5, negative bus bar 60b has six bent portions 171.

[0059] The second busbar 61 includes a first connection terminal portion 162a and a second connection terminal portion 162b. The first connection terminal portion 162a is provided on the Z2 direction side of the second busbar 61, and is connected to the output terminal 2 (see FIG. 1). The second connection terminal portion 162b is provided on the Z1 direction side of the second busbar 61, and is connected to the smoothing reactor 23d (see FIG. 2).

[0060] 5, second bus bar 61 has a plurality of bent portions 172 between first connection terminal portion 162a and second connection terminal portion 162b. In the example shown in FIG. 5, second bus bar 61 has five bent portions 172.

[0061] It should be noted that the shapes of positive bus bar 60a, negative bus bar 60b, and second bus bar 61 shown in FIG. 5 are merely examples, and are not limited to the shapes shown in FIG.

[0062] (Relationship between groove width and busbar thickness, and configuration of contact portion) Next, with reference to Figures 6 and 7, the relationship between the thicknesses of the positive busbar 60a (see Figure 6), the negative busbar 60b (see Figure 6), and the second busbar 61 (see Figure 6) and the groove widths of the first groove portion 41a (see Figure 7) to the third groove portion 41c (see Figure 7), and the configuration of the abutment portion 43 (see Figure 7) will be described.

[0063] 6, the positive busbar 60a is a busbar having a predetermined thickness T1. The negative busbar 60b is a busbar having a predetermined thickness T2. The second busbar 61 is a busbar having a predetermined thickness T3. The thickness T1 of the positive busbar 60a, the thickness T2 of the negative busbar 60b, and the thickness T3 of the second busbar 61 are the thicknesses of each busbar in the X direction.

[0064] In this embodiment, the thickness T1 of the positive bus bar 60a, the thickness T2 of the negative bus bar 60b, and the thickness T3 of the second bus bar 61 are equal to each other. However, the thickness T1 of the positive bus bar 60a, the thickness T2 of the negative bus bar 60b, and the thickness T3 of the second bus bar 61 do not have to be equal to each other.

[0065] In this embodiment, as shown in FIG. 7, groove portion 41 has a groove width that is greater than the thickness of first bus bar 60.

[0066] Specifically, the groove width W1 of the first groove 41a in which the positive busbar 60a (see FIG. 6) is disposed is greater than the thickness T1 (see FIG. 6) of the positive busbar 60a. The groove width W2 of the second groove 41b in which the negative busbar 60b (see FIG. 6) is disposed is greater than the thickness T2 (see FIG. 6) of the negative busbar 60b. The groove width W3 of the third groove 41c in which the second busbar 61 (see FIG. 6) is disposed is greater than the thickness T3 (see FIG. 6) of the second busbar 61.

[0067] 7, the groove portion 41 has contact portions 43 on the inner surfaces 42 of the groove portion 41 that contact the first bus bar 60. In this embodiment, the contact portions 43 include a plurality of contact portions 43 arranged at different positions in the extending direction of the groove portion 41 on both inner surfaces 42 in the width direction (X direction) of the groove portion 41.

[0068] Specifically, as shown in FIG. 7, the first groove portion 41a includes a plurality of first abutment portions 43a arranged at different positions in the direction in which the first groove portion 41a extends on both inner surfaces 42a. As shown in FIG. 7, the first abutment portions 43a have a semicircular cross section. In addition, in a portion where the first groove portion 41a extends along the Z direction, the plurality of first abutment portions 43a are arranged at different positions in the Z direction on both inner surfaces 42a in the X direction of the first groove portion 41a. In addition, in a portion where the first groove portion 41a extends along the X direction, the plurality of first abutment portions 43a are arranged at different positions in the X direction on both inner surfaces 42a in the Z direction of the first groove portion 41a.

[0069] 7, the distance D1 between the opposing first contact portions 43a is substantially equal to the thickness T1 of the positive busbar 60a. That is, the first groove portion 41a holds the positive busbar 60a by the multiple first contact portions 43a. Note that the distance D1 between the opposing first contact portions 43a being substantially equal to the thickness T1 of the positive busbar 60a means that the distance D1 between the opposing first contact portions 43a is a distance that allows the opposing first contact portions 43a to hold the positive busbar 60a. Specifically, the distance D1 between the opposing first contact portions 43a is slightly smaller than the thickness T1 of the positive busbar 60a. Therefore, by press-fitting the positive busbar 60a into the first groove portion 41a (the position between the opposing first abutment portions 43a), the positive busbar 60a can be held in a fixed state by the opposing first abutment portions 43a.

[0070] Moreover, the first groove portion 41a has a plurality of bent portions 44a. Specifically, the first groove portion 41a has the plurality of bent portions 44a so as to have a shape in which the positive bus bar 60a can be disposed.

[0071] The second groove 41b includes a plurality of second abutment portions 43b arranged on both inner side surfaces 42b at different positions in the direction in which the second groove 41b extends. As shown in FIG. 7, the second abutment portions 43b have a semicircular cross section. In addition, in a portion where the second groove 41b extends along the Z direction, the plurality of second abutment portions 43b are arranged at different positions in the Z direction on both inner side surfaces 42b in the X direction of the second groove 41b. In addition, in a portion where the second groove 41b extends along the X direction, the plurality of second abutment portions 43b are arranged at different positions in the X direction on both inner side surfaces 42b in the Z direction of the second groove 41b.

[0072] 7, the distance D2 between the opposing second contact portions 43b is approximately equal to the thickness T2 of the negative busbar 60b. That is, the second groove portion 41b holds the negative busbar 60b with the multiple second contact portions 43b. Note that the distance D2 between the opposing second contact portions 43b being approximately equal to the thickness T2 of the negative busbar 60b means that the distance D2 between the opposing second contact portions 43b is a distance that allows the opposing second contact portions 43b to hold the negative busbar 60b. Specifically, the distance D2 between the opposing second contact portions 43b is slightly smaller than the thickness T2 of the negative busbar 60b. Therefore, by pressing the negative busbar 60b into the second groove portion 41b (the position between the opposing second abutment portions 43b), the negative busbar 60b can be held in a fixed state by the opposing second abutment portions 43b.

[0073] Further, the second groove portion 41b has a plurality of bent portions 44b. Specifically, the second groove portion 41b has the plurality of bent portions 44b so as to have a shape in which the negative bus bar 60b can be disposed.

[0074] The third groove 41c includes a plurality of third abutment portions 43c arranged on both inner side surfaces 42c at different positions in the direction in which the third groove 41c extends. As shown in FIG. 7, the third abutment portion 43c has a semicircular cross section. In addition, in a portion in which the third groove 41c extends along the Z direction, the plurality of third abutment portions 43c are arranged at different positions in the Z direction on both inner side surfaces 42c in the X direction of the third groove 41c. In addition, in a portion in which the third groove 41c extends along the X direction, the plurality of third abutment portions 43c are arranged at different positions in the X direction on both inner side surfaces 42c in the Z direction of the third groove 41c.

[0075] As shown in FIG. 7, the distance D3 between the opposing third contact portions 43c is substantially equal to the thickness T3 of the second busbar 61. That is, the third groove portion 41c holds the second busbar 61 by the multiple third contact portions 43c. Here, the distance D3 between the opposing third contact portions 43c being substantially equal to the thickness T3 of the second busbar 61 means that the distance D3 between the opposing third contact portions 43c is a distance that allows the opposing third contact portions 43c to hold the second busbar 61. Specifically, the distance D3 between the opposing third contact portions 43c is slightly smaller than the thickness T3 of the second busbar 61. Therefore, by press-fitting the second busbar 61 into the third groove portion 41c (at a position between the opposing third contact portions 43c), the second busbar 61 can be held in a fixed state by the opposing third contact portions 43c.

[0076] Additionally, the third groove 41c has a plurality of bent portions 44c. Specifically, the third groove 41c has a plurality of bent portions 44c so as to have a shape in which the positive bus bar 60a can be disposed.

[0077] 7, the portion 40b of the housing 40 that accommodates the capacitor C1 has a plurality of protrusions 40c that protrude in the X1 direction. The plurality of protrusions 40c are provided at different positions in the Z direction from a plurality of first abutment portions 43a provided on an inner surface 42a on the X1 direction side of the first groove portion 41a. That is, the plurality of protrusions 40c function as abutment portions 43 on the X2 direction side of the first groove portion 41a.

[0078] (Relationship between busbar width and groove depth) Next, with reference to Figures 8 and 9, the relationship between the widths of the positive busbar 60a (see Figure 8), the negative busbar 60b (see Figure 8), and the second busbar 61 and the depths of the first groove portion 41a (see Figure 9) to the third groove portion 41c (see Figure 9) will be described.

[0079] 8, the positive bus bar 60a has a predetermined width W4. The negative bus bar 60b has a predetermined width W5. The second bus bar 61 has a predetermined width W6. The width W4 of the positive bus bar 60a, the width W5 of the negative bus bar 60b, and the width W6 of the second bus bar 61 are the lengths of each bus bar in the Y direction.

[0080] 8, in this embodiment, the width W4 of the positive bus bar 60a, the width W5 of the negative bus bar 60b, and the width W6 of the second bus bar 61 are equal to each other. Note that the width W4 of the positive bus bar 60a, the width W5 of the negative bus bar 60b, and the width W6 of the second bus bar 61 do not have to be equal to each other.

[0081] As shown in FIG. 9, the first groove 41a has a depth D4 that is greater than the width W4 (see FIG. 8) of the positive bus bar 60a (see FIG. 8). The second groove 41b has a depth D5 that is greater than the width W5 (see FIG. 8) of the negative bus bar 60b (see FIG. 8). The third groove 41c has a depth D6 that is greater than the width W5 (see FIG. 8) of the second bus bar 61 (see FIG. 8). The depth D4 of the first groove 41a, the depth D5 of the second groove 41b, and the depth D6 of the third groove 41c are the lengths of each groove 41 in the Y direction.

[0082] Because the depth D4 of the first groove 41a is greater than the width W4 of the positive busbar 60a, when the positive busbar 60a is disposed in the first groove 41a, the position of the end 160d (see FIG. 8) on the Y1 direction side of the positive busbar 60a is located inside (on the Y2 direction side) of the end 40d on the Y1 direction side of the housing 40. In other words, the first groove 41a allows the positive busbar 60a to be disposed inside the first groove 41a in the Y direction.

[0083] Furthermore, because the depth D5 of the second groove 41b is greater than the width W5 of the negative busbar 60b, when the negative busbar 60b is disposed in the second groove 41b, the position of the end 161c (see FIG. 8) on the Y1 direction side of the negative busbar 60b is inside (Y2 direction side) of the end 40d on the Y1 direction side of the housing 40. In other words, the second groove 41b allows the negative busbar 60b to be disposed inside the second groove 41b in the Y direction.

[0084] Furthermore, because the depth D6 of the third groove 41c is greater than the width W6 of the second busbar 61, when the second busbar 61 is disposed in the third groove 41c, the position of the end 162c (see FIG. 8) on the Y1 direction side of the second busbar 61 is on the inside (Y2 direction side) of the third groove 41c. That is, the third groove 41c allows the second busbar 61 to be disposed on the inside of the third groove 41c in the Y direction.

[0085] Therefore, each of the positive bus bar 60a, the negative bus bar 60b, and the second bus bar 61 can be arranged inside a groove portion 41 provided in the insulating housing 40 in the Y direction, so that each bus bar can be arranged individually in an insulated state without applying an insulating treatment to each bus bar.

[0086] (Arrangement of bus bars relative to the housing) 10, the positive bus bar 60a, the negative bus bar 60b, and the second bus bar 61 are arranged in the first groove 41a, the second groove 41b, and the third groove 41c, respectively, while being spaced apart from one another in the X direction in the housing 40. In this embodiment, the positive bus bar 60a, the negative bus bar 60b, and the second bus bar 61 are arranged in this order in the grooves 41 from the X2 direction side. The positive bus bar 60a, the negative bus bar 60b, and the second bus bar 61 are arranged side by side at the end 40e on the X1 direction side of the housing 40.

[0087] As shown in FIG. 10, the power conversion device 100 includes a third bus bar 62 that electrically connects the boost converter unit 22 (see FIG. 1) and the capacitor C1 (see FIG. 1). The housing 40 has a third bus bar fixing portion 45 to which the third bus bar 62 is fixed. In this embodiment, the third bus bar 62 includes a third positive side bus bar 62a and a third negative side bus bar 62b. The third positive side bus bar 62a is connected to a positive side terminal of the capacitor C1. The third negative side bus bar 62b is connected to a negative side terminal of the capacitor C1.

[0088] In this embodiment, the third busbar fixing portion 45 is provided at the end portion 40f on the X2 direction side of the housing 40. Therefore, the third busbar 62 is fixed to the end portion 40f on the X2 direction side of the housing 40. The third busbar 62 is fixed to the third busbar fixing portion 45 by, for example, being screwed. Note that the third busbar 62 may be fixed to the third busbar fixing portion 45 by a method other than screwing.

[0089] [Effects of this embodiment] In this embodiment, the following effects can be obtained.

[0090] In this embodiment, as described above, the power conversion device 100 includes a DC-DC converter unit 20 that transforms DC power input from a DC power source 200, an inverter unit 10 that is provided at a position opposite the DC-DC converter unit 20 and converts the DC power transformed by the DC-DC converter unit 20 into AC power and supplies it to a load 210, a capacitor C2 that is provided on the inverter unit 10 side and connected to the DC-DC converter unit 20, and a first bus bar 60 that is provided in an insulating housing 40 that houses the capacitor C2 and serves as wiring that electrically connects the DC-DC converter unit 20 and the DC power source 200 provided on the inverter unit 10 side.

[0091] In this embodiment, as described above, the first bus bar 60 is disposed in the insulating housing 40 housing the capacitor C2, and serves as wiring for electrically connecting the DC-DC converter unit 20 and the DC power supply 200 provided on the inverter unit 10 side. As a result, the first bus bar 60 is disposed in the housing 40 housing the insulating capacitor C2. Unlike a configuration in which the first bus bar 60 is disposed in a non-insulating member, the first bus bar 60 can be disposed in the housing 40 while ensuring insulation without insulating the first bus bar 60 itself. In addition, the DC-DC converter unit 20 and the DC power supply 200 are electrically connected by the first bus bar 60 disposed in the housing 40. Therefore, the DC-DC converter unit 20 and the DC power supply 200, which are disposed at a distance from each other via an intervening object, can be easily disposed on one side and the other side of the power conversion device 100. As a result, when electrically connecting the DC-DC converter section 20 and the DC power supply 200, which are arranged at a distance from each other via an intervening object on one side and the other side of the power conversion device 100, wiring can be easily arranged while ensuring insulation.

[0092] In this embodiment, as described above, the cooling unit 50 is disposed between the inverter unit 10 and the DC-DC converter unit 20 and cools the inverter unit 10 and the DC-DC converter unit 20. The DC-DC converter unit 20 is disposed on one side of the cooling unit 50, and the DC power supply 200 and the inverter unit 10 are disposed on the other side of the cooling unit 50. This allows the first bus bar 60 to be easily disposed in a configuration in which the inverter unit 10 and the DC-DC converter unit 20 disposed in opposing positions are cooled by the cooling unit 50. As a result, in the power conversion device 100 in which the inverter unit 10 and the DC-DC converter unit 20 disposed in opposing positions are cooled by the cooling unit 50, wiring can be easily disposed when electrically connecting the DC-DC converter unit 20 and the DC power supply 200 while ensuring insulation.

[0093] In this embodiment, as described above, housing 40 is made of an insulating resin material, has groove portion 41 provided on outer surface 40a, and first bus bar 60 is disposed in groove portion 41. Thus, by disposing first bus bar 60 in groove portion 41 of housing 40 made of an insulating resin material, first bus bar 60 can be easily insulated without covering first bus bar 60 itself with an insulating member.

[0094] In this embodiment, as described above, the groove portion 41 has a groove width larger than the thickness of the first busbar 60, and has an abutting portion 43 that abuts against the first busbar 60 on the inner side surface 42 of the groove portion 41. As a result, since the groove width of the groove portion 41 is larger than the thickness of the first busbar 60, the first busbar 60 can be easily arranged in the groove portion 41. Furthermore, since the inner side surface 42 of the groove portion 41 has an abutting portion 43 that abuts against the first busbar 60, it is possible to prevent the position of the first busbar 60 from shifting after the first busbar 60 is arranged in the groove portion 41. As a result, it is possible to prevent the position of the first busbar 60 from shifting while ensuring ease of assembly when arranging the first busbar 60 in the groove portion 41.

[0095] In this embodiment, as described above, the abutment portions 43 include a plurality of abutment portions 43 arranged at different positions in the extension direction of the groove portion 41 on both inner side surfaces 42 in the width direction (X direction) of the groove portion 41. As a result, the abutment portions 43 abut against the first bus bar 60 on both sides in the width direction of the groove portion 41 and at different positions in the extension direction of the groove portion 41, so that misalignment of the first bus bar 60 can be easily and reliably suppressed.

[0096] In the present embodiment, as described above, the groove portion 41 is provided in the housing 40 so as to be adjacent to the portion 40b of the housing 40 that houses the capacitor C2. This makes it possible to prevent the thickness of the housing 40 that houses the capacitor C2 from increasing, as compared to a configuration in which the groove portion 41 is formed on the outside of the portion 40b that houses the capacitor C2. As a result, it is possible to prevent the housing 40 that houses the capacitor C2 from increasing in size, and therefore, it is possible to prevent the power conversion device 100 from increasing in size.

[0097] In this embodiment, as described above, the DC power supply 200 has the input terminal 1 provided on the inverter unit 10 side, the first bus bar 60 includes a positive bus bar 60a electrically connected to the positive terminal 1a of the input terminal 1 and a negative bus bar 60b electrically connected to the negative terminal 1b of the input terminal 1, and the groove portion 41 includes a first groove portion 41a in which the positive bus bar 60a is arranged and a second groove portion 41b in which the negative bus bar 60b is arranged. With this, by arranging the positive bus bar 60a in the first groove portion 41a and arranging the negative bus bar 60b in the second groove portion 41b, the positive bus bar 60a and the negative bus bar 60b can be easily insulated from each other. As a result, even when the first bus bar 60 includes a plurality of bus bars, each bus bar can be easily insulated from each other.

[0098] In this embodiment, as described above, the DC-DC converter unit 20 includes the DCDC converter unit 21 that steps down the DC power, and further includes the output terminal 2 to which the DC power stepped down by the DCDC converter unit 21 is output, and the second bus bar 61 electrically connected to the output terminal 2, and the groove portion 41 further includes a third groove portion 41c in which the second bus bar 61 is disposed. This makes it possible to easily dispose the second bus bar 61 while insulating it when electrically connecting the DCDC converter unit 21 and the output terminal 2 with the second bus bar 61.

[0099] In this embodiment, as described above, the DC-DC converter section 20 includes the boost converter section 22 that boosts the DC power, and further includes the third bus bar 62 that electrically connects the boost converter section 22 and the capacitor C2, and the housing 40 has the third bus bar fixing section 45 to which the third bus bar 62 is fixed. This allows not only the first bus bar 60 but also the third bus bar 62 to be arranged in the housing 40 that houses the capacitor C2. Therefore, compared to a configuration in which the third bus bar 62 is arranged at a position different from the housing 40 that houses the capacitor C2, the arrangement of the third bus bar 62 and the first bus bar 60 can be consolidated in the housing 40. As a result, it is possible to prevent the arrangement of the third bus bar 62 from becoming complicated.

[0100] [Variations] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims, not by the description of the embodiments above, and further includes all modifications (variations) within the meaning and scope of the claims.

[0101] In the above embodiment, an example of a configuration in which the housing 40 is made of an insulating resin material has been described, but the present invention is not limited to this. For example, the housing may be made of a material other than a resin material as long as it has insulating properties. For example, the housing may be made of a metal material as long as an insulating treatment is applied to the portion that contacts the first bus bar.

[0102] In the above embodiment, an example of a configuration in which the housing 40 has the groove portion 41 and the first bus bar 60 is disposed in the groove portion 41 has been described, but the present invention is not limited to this. For example, the housing may not have a groove portion. In this case, the housing may be configured to hold the first bus bar 60 on the outer surface. However, in the case of a configuration in which the first bus bar 60 is held on the outer surface of the housing, it is necessary to insulate the first bus bar 60 by, for example, subjecting the first bus bar 60 itself to an insulating treatment or covering the first bus bar 60 with an insulating member. Therefore, it is preferable that the housing 40 is configured to have the groove portion 41.

[0103] In the above embodiment, an example of a configuration in which the groove portion 41 has a groove width larger than the thickness of the first busbar 60 and has an abutting portion 43 on the inner surface 42 of the groove portion 41 has been shown, but the present invention is not limited to this. The groove portion does not need to have an abutting portion on the inner surface. In this case, the groove width of the groove portion may be approximately equal to the thickness of the first busbar 60. However, if the groove width of the groove portion is approximately equal to the thickness of the first busbar 60, the ease of assembly when arranging the first busbar 60 in the groove portion decreases. Therefore, it is preferable that the groove portion 41 is configured to have a groove width larger than the thickness of the first busbar 60 and to have an abutting portion 43 on the inner surface 42.

[0104] In the above embodiment, the groove 41 has a plurality of abutment portions 43 arranged at different positions in the direction in which the groove 41 extends on both inner side surfaces 42 in the width direction of the groove 41. However, the present invention is not limited to this. For example, the groove may have one abutment portion on the inner side surface. However, when the groove has one abutment portion, it may be difficult to suppress the positional deviation of the first bus bar 60 when the first bus bar 60 is arranged with respect to the groove. Therefore, it is preferable that the groove 41 has a plurality of abutment portions 43 arranged at different positions in the direction in which the groove 41 extends on both inner side surfaces 42 in the width direction of the groove 41.

[0105] In the above embodiment, the first bus bar 60 includes the positive bus bar 60a and the negative bus bar 60b, and the groove portion 41 includes the first groove portion 41a in which the positive bus bar 60a is arranged and the second groove portion 41b in which the negative bus bar 60b is arranged. However, the present invention is not limited to this. For example, the groove portion may include only one groove portion in which the positive bus bar 60a and the negative bus bar 60b are arranged. However, when the positive bus bar 60a and the negative bus bar 60b are arranged in only one groove portion, it is necessary to arrange the positive bus bar 60a and the negative bus bar 60b so that they do not contact each other inside the groove portion. Therefore, the ease of assembly when arranging the positive bus bar 60a and the negative bus bar 60b in the groove portion is reduced. Therefore, it is preferable that the groove portion 41 is configured to include a first groove portion 41a in which the positive bus bar 60a is disposed, and a second groove portion 41b in which the negative bus bar 60b is disposed.

[0106] In the above embodiment, the DC-DC converter unit 20 includes the DCDC converter unit 21, and the power conversion device 100 includes the second bus bar 61 that electrically connects the DCDC converter unit 21 and the output terminal 2. However, the present invention is not limited to this. For example, if the DC-DC converter unit 20 does not include the DCDC converter unit 21, the power conversion device does not need to include the second bus bar 61. The number of bus bars included in the power conversion device 100 can be changed depending on the circuit configuration of the power conversion device 100.

[0107] In the above embodiment, the power conversion device 100 is disposed between the inverter unit 10 and the DC-DC converter unit 20, and includes the cooling unit 50 for cooling the inverter unit 10 and the DC-DC converter unit 20. However, the present invention is not limited to this. For example, the power conversion device does not need to include the cooling unit 50. However, if the power conversion device does not include the cooling unit 50, the inverter unit 10 and the DC-DC converter unit 20 are not cooled, and the power conversion efficiency decreases. Therefore, it is preferable that the power conversion device 100 includes the cooling unit 50.

[0108] In the above embodiment, an example of a configuration in which the DC-DC converter unit 20 includes the boost converter unit 22 and the power conversion device 100 includes the third bus bar 62 that electrically connects the boost converter unit 22 and the capacitor C1 has been described, but the present invention is not limited to this. For example, if the DC-DC converter unit 20 does not include the boost converter unit 22, the power conversion device does not need to include the third bus bar 62. The number of bus bars included in the power conversion device 100 can be changed depending on the circuit configuration of the power conversion device 100.

[0109] In the above embodiment, the DC-DC converter unit 20 is provided on the Z1 side, and the inverter unit 10 and the capacitor C1 are provided on the Z2 side, but the present invention is not limited to this. For example, the DC-DC converter unit 20 may be provided on the Z2 side, and the inverter unit 10 and the capacitor C1 may be provided on the Z1 side. [Explanation of symbols]

[0110] 1 Input terminal 1a Positive terminal 1b Negative terminal 2 Output terminals 10 Inverter section 20 DC-DC converter section 21 DC / DC converter section (step-down converter section) 22 Boost converter section 40 Housing (insulating housing for accommodating capacitors) 41 Outer surface (outer surface of insulating housing that houses the capacitor) 41 Groove 41a First groove 41b 2nd groove 41c Third groove 42 Inner surface (inner surface of groove) 43 contact portion (contact portion that contacts the first bus bar) 45 3rd busbar fixing part 50 Cooling section 60 1st bus bar 60a positive busbar 60b Negative busbar 61 Second bus bar 63 3rd bus bar 100 Power conversion device 200 DC power supply 210 Load C1 Capacitor

Claims

1. a DC-DC converter unit that transforms DC power input from a DC power source; an inverter unit provided at a position opposite to the DC-DC converter unit, which converts the DC power transformed by the DC-DC converter unit into AC power and supplies the AC power to a load; a capacitor disposed on the inverter unit side and connected to the DC-DC converter unit; A power conversion device comprising: a first bus bar arranged in an insulating housing that houses the capacitor and serves as wiring that electrically connects the DC-DC converter unit and the DC power supply provided on the inverter unit side.

2. a cooling unit arranged between the inverter unit and the DC-DC converter unit and configured to cool the inverter unit and the DC-DC converter unit, 2 . The power conversion device according to claim 1 , wherein the DC-DC converter unit is provided on one side of the cooling unit, and the DC power supply and the inverter unit are provided on the other side of the cooling unit.

3. The housing is made of an insulating resin material and has a groove on an outer surface thereof. The power conversion device according to claim 2 , wherein the first bus bar is disposed in the groove portion.

4. The power conversion device according to claim 3 , wherein the groove has a groove width larger than a thickness of the first bus bar, and has an abutment portion on an inner side surface of the groove that abuts against the first bus bar.

5. The power conversion device according to claim 4 , wherein the contact portion includes a plurality of contact portions arranged at different positions in an extension direction of the groove portion on both inner side surfaces in a width direction of the groove portion.

6. The power conversion device according to claim 5 , wherein the groove is provided in the housing so as to be adjacent to a portion of the housing that houses the capacitor.

7. The DC power supply has an input terminal provided on the inverter unit side, the first bus bar includes a positive bus bar electrically connected to a positive terminal of the input terminal and a negative bus bar electrically connected to a negative terminal of the input terminal, The power conversion device according to claim 6 , wherein the groove portion includes a first groove portion in which the positive bus bar is disposed, and a second groove portion in which the negative bus bar is disposed.

8. the DC-DC converter unit includes a step-down converter unit that steps down the DC power, an output terminal to which the DC power stepped down by the step-down converter unit is output; a second bus bar electrically connected to the output terminal; The power conversion device according to claim 7 , wherein the groove portion further includes a third groove portion in which the second bus bar is disposed.

9. the DC-DC converter unit includes a boost converter unit that boosts the DC power, a third bus bar electrically connecting the boost converter unit and the capacitor; The power conversion device according to claim 8 , wherein the housing has a third bus bar fixing portion to which the third bus bar is fixed.

Images