Power conversion device

Abstract

A power conversion device (1) comprises: at least one power module (4); a capacitor module (2) that has at least one capacitor element (10), a capacitor case accommodating the capacitor element (10), and a positive electrode capacitor bus bar (7) and a negative electrode capacitor bus bar (8) each having one side connected to the capacitor element (10) and the other side protruding from the same side of the capacitor case (12); and an input bus bar (3) that has a positive electrode input bus bar (13) and a negative electrode input bus bar (14). The positive electrode capacitor bus bar (7) and the negative electrode capacitor bus bar (8) each have a plurality of connection terminals provided at the end on the other side protruding from the capacitor case (12). The plurality of connection terminals can establish both of: electrical connection with either the power module (4) or the input bus bar (3); and connection with the power module (4) and the input bus bar (3).

Description

Power conversion device

[0001] The present disclosure relates to a power conversion device.

[0002] In vehicles such as electric vehicles and hybrid vehicles that use a motor as a drive source, a power conversion device that performs power conversion between DC power and AC power is installed. The power conversion device includes a power module having a switching element such as an IGBT (Insulated Gate Bipolar Transistor), and performs a converter operation that converts DC power into three-phase AC power and regenerates energy.

[0003] As a power conversion device, a configuration is disclosed that includes a power module in which a switching element for performing power conversion is mounted, a cooler for cooling the power module, and a capacitor module having a capacitor element for smoothing the DC voltage supplied from an external DC power source (see, for example, Patent Document 1). The capacitor module disclosed in Patent Document 1 includes a capacitor element, an open-side electrode and a wall-side electrode which are a pair of electrodes formed on both end faces of the capacitor element, a capacitor bus bar connected to each of these electrodes, and a capacitor case that houses the capacitor element inside. The power module is connected to the capacitor bus bar on one side and to an output bus bar connected to the motor on the other side. The open-side electrode of the capacitor element is connected to the cooler-side terminal of the power module. The wall-side electrode of the capacitor element is connected to an external DC power source.

[0004] In such a configuration, when producing a power conversion device having various connection configurations depending on the layout of the vehicle, the extraction position of the terminal connected to the external DC power source cannot be made common for all capacitor modules. Therefore, different parts inside the capacitor module will be produced according to the required extraction position.

[0005] Japanese Patent No. 7386914

[0006] In Patent Document 1, the capacitor module has a connection part for an external DC power supply and a connection part for a power module, and the electrode parts of each connection part are provided in different locations. If the connection part for the power module and the electrode part of the capacitor module connected to the DC power supply require drawing out to the DC power supply at opposite locations, in the disclosed configuration, since the electrode part of the capacitor module extends in only one direction, it is necessary to manufacture different capacitor modules in order to connect to the external DC power supply over the shortest distance. Manufacturing different capacitor modules requires parts with modified specifications, which hinders the cost reduction of the power conversion device. To avoid manufacturing different capacitor modules, it is necessary to provide an additional input busbar that electrically connects the external DC power supply and the electrode part of the capacitor module, and draw out the electrode part on the opposite side across the capacitor module. In such a configuration, additional parts with different specifications and space for wiring are required, which hinders the miniaturization and cost reduction of the power conversion device.

[0007] Therefore, the purpose of this disclosure is to obtain a power conversion device that is miniaturized and has a lower cost without changing the specifications of the components.

[0008] The power converter of this disclosure comprises: one or more power modules having one or more semiconductor chips and a plurality of electrode terminals electrically connected to the semiconductor chips; one or more capacitor elements, a capacitor case housing the capacitor elements, and a capacitor module having a positive capacitor busbar and a negative capacitor busbar, one side of which is electrically connected to the capacitor elements and the other side of which protrudes from the same side of the capacitor case; and an input busbar having a positive input busbar and a negative input busbar that is connected to the outside and inputs and outputs DC power to the capacitor elements, wherein a plurality of connection terminals are provided at the other end of the positive capacitor busbar and the negative capacitor busbar that protrude from the capacitor case, and each of the plurality of connection terminals is a terminal that can be used for both connections, electrically connected to either the power module or the input busbar, and can be connected to both the power module and the input busbar.

[0009] According to the power converter of the present disclosure, in the power converter according to Embodiment 1, the power converter comprises one or more power modules, a capacitor module having a positive capacitor busbar and a negative capacitor busbar that are electrically connected to a capacitor element on one side and protruding from the same side of the capacitor case on the other side, and an input busbar having a positive input busbar and a negative input busbar that inputs and outputs DC power to the capacitor element, and a plurality of connection terminals are provided at the other end of the positive capacitor busbar and the negative capacitor busbar that protrude from the capacitor case, and each of the plurality of connection terminals is electrically connected to either the power module or the input busbar, and is a terminal that can be used for both connections, so the arrangement of the input busbar can be changed without changing the configuration of the power converter. Since the arrangement of the input busbar can be changed without changing the configuration of the power converter, it becomes unnecessary to manufacture different capacitor modules, and it also becomes unnecessary to secure additional parts and additional space for routing wiring, so the parts that make up the power converter can be standardized. Because the components that make up the power converter are standardized, the power converter can be made smaller and less expensive without changing the specifications of the components.

[0010] This is a perspective view showing an outline of the power converter according to Embodiment 1. This is a plan view showing an outline of the power converter according to Embodiment 1. This is a plan view showing an outline of another power converter according to Embodiment 1. This is a perspective view showing the capacitor module of the power converter according to Embodiment 1. This is an exploded perspective view showing the capacitor module of the power converter according to Embodiment 1. This is a perspective view showing the positive capacitor busbar of the capacitor module of the power converter according to Embodiment 1. This is a perspective view showing the negative capacitor busbar of the capacitor module of the power converter according to Embodiment 1. This is a side view showing the fixed portion of the capacitor module of the power converter according to Embodiment 1. This is a side view of another capacitor module of the power converter according to Embodiment 1. This is a perspective view showing the power input busbar of the power converter according to Embodiment 1. This is an exploded perspective view showing the input busbar of the power converter according to Embodiment 1. This is a perspective view showing the output terminal block of the power converter according to Embodiment 1. This is an exploded perspective view showing the output terminal block of the power converter according to Embodiment 1. This is a perspective view showing the power converter according to Embodiment 1. This is an exploded perspective view showing the power converter according to Embodiment 1. This is a diagram showing an outline of the circuit of the power converter according to Embodiment 1. This figure shows an example of the installation state of the power conversion device according to Embodiment 1.

[0011] The power conversion device according to the embodiment of this disclosure will be described below with reference to the figures. In each figure, the same or equivalent components and parts will be denoted by the same reference numerals.

[0012] Embodiment 1. Figure 1 is a perspective view showing a schematic of the power converter 1 according to Embodiment 1, Figure 2 is a plan view showing a schematic of the power converter 1 with the outline of the control board 24 indicated by a dashed line, Figure 3 is a plan view showing a schematic of another power converter 1 according to Embodiment 1, Figure 4 is a perspective view showing the capacitor module 2 of the power converter 1, Figure 5 is an exploded perspective view showing the capacitor module 2, and Figure 6 is a perspective view showing the positive capacitor busbar 7 of the capacitor module 2. Figure 7 is a perspective view showing the negative capacitor busbar 8 of the capacitor module 2, Figure 8 is a side view showing the fixed portion of the capacitor module 2, Figure 9 is a side view of another capacitor module 2 of the power converter 1, Figure 10 is a perspective view showing the power module 4 of the power converter 1 together with the base 5, Figure 11 is a perspective view showing the power module 4, Figure 12 is a perspective view showing the input busbar 3 of the power converter 1, Figure 13 is an exploded perspective view showing the input busbar 3, Figure 14 is a perspective view showing the output terminal block 6 of the power converter 1, Figure 15 is an exploded perspective view showing the output terminal block 6, Figure 16 is a perspective view showing the power converter 1, Figure 17 is an exploded perspective view showing the power converter 1, Figure 18 is a schematic diagram showing the circuit of the power converter 1, and Figure 19 is a diagram showing an example of the installation state of the power converter 1. The power converter 1 is a device that converts, for example, an input current from DC to AC, AC to DC, or an input voltage to a different voltage. In this embodiment, the power conversion device 1 is described as an inverter, but the power conversion device 1 is not limited to an inverter.

[0013] <Power Conversion Device 1> As shown in Figure 1, the power conversion device 1 comprises one or more power modules 4 constituting a power conversion unit, a capacitor module 2 electrically connected to the power modules 4, and an input busbar 3 electrically connected to the capacitor module 2. In this embodiment, the power conversion device 1 comprises three power modules 4, but the number of power modules 4 is not limited to this. The power conversion device 1 further comprises a base 5 made of metal on which the power modules 4 are mounted, and one or more output busbars 17 electrically connected to the power modules 4 and inputting and outputting alternating current. In this embodiment, the power conversion device 1 comprises three output busbars 17, but the number of output busbars 17 is not limited to this. In this embodiment, an output terminal block 6 is formed by the output busbars 17. The base 5 is a cooler for cooling the power modules 4. The base 5 is made of a metal such as copper that has excellent thermal conductivity.

[0014] As shown in Figure 2, the power module 4 has one or more semiconductor chips 4a and a plurality of electrode terminals 4b electrically connected to the semiconductor chips 4a. In Figure 2, the semiconductor chips 4a are shown by dashed lines. In this embodiment, the power module 4 has two semiconductor chips 4a, but the number of semiconductor chips 4a is not limited to this. As shown in Figure 5, the capacitor module 2 has one or more capacitor elements 10, a capacitor case 12 housing the capacitor elements 10, and a positive capacitor busbar 7 and a negative capacitor busbar 8, which are electrically connected to the capacitor elements 10 on one side and protrude from the same side of the capacitor case 12 on the other side. In this embodiment, the capacitor module 2 has five capacitor elements 10, but the number of capacitor elements 10 is not limited to this. As shown in Figure 13, the input busbar 3 has a positive input busbar 13 and a negative input busbar 14 that are connected to the outside and input / output DC power to and from the capacitor elements 10.

[0015] As shown in Figure 4, multiple connection terminals are provided at the other end of the positive capacitor busbar 7 and the negative capacitor busbar 8, which protrude from the capacitor case 12. The multiple connection terminals are the positive connection terminal 7a, which is the connection terminal for the positive capacitor busbar 7, and the negative connection terminal 8a, which is the connection terminal for the negative capacitor busbar 8. Here, we define the directions. The direction in which the positive connection terminal 7a and the negative connection terminal 8a protruding from the same side of the capacitor case 12 are aligned is defined as the Y direction, the direction perpendicular to the Y direction and on the side of the positive capacitor busbar 7 and the negative capacitor busbar 8 opposite to the power module 4 is defined as the X direction, and the direction perpendicular to the X and Y directions is defined as the Z direction. In the figure, the direction indicated by the arrow is one side, and the direction opposite to the direction indicated by the arrow is the other side.

[0016] In this embodiment, as shown in Figure 17, the power converter 1 further comprises a control board 24 on which one or more electronic components 25a are mounted, and a housing 23 housing a power module 4, a capacitor module 2, an input busbar 3, and an output busbar 17. The control board 24 is electrically connected to the power module 4. The control board 24 is fixed to the housing 23 by screws 22. The housing 23 is made of a metal material with excellent thermal conductivity, such as an aluminum alloy. The housing 23 is manufactured by, for example, casting. In this embodiment, the bottom wall 23a of the housing 23 is formed in a rectangular shape, so the housing 23 is formed in the shape of a box with a bottom. In this embodiment, the base 5 on which the power module 4 is mounted, the capacitor module 2, the input busbar 3, and the output terminal block 6 are fixed to the bottom wall 23a of the housing 23. Heat generated by these components is dissipated to the outside through the bottom wall 23a of the housing 23.

[0017] The power converter 1 may further include a cover that covers the open portion of the housing 23. By providing a cover, the components mounted on the power converter 1 can be protected from foreign objects that may enter the power converter 1. If the cover is made of metal, the components mounted on the power converter 1 can be protected from electromagnetic noise.

[0018] As shown in Figure 18, the power converter 1 is a device that receives DC power from the connection terminals (not shown) of a capacitor module 2 connected to an external DC power source, a battery 26, and converts the smoothed DC power in a power module 4 to output it to a load. The DC power source is, for example, a secondary battery such as a lithium-ion battery. The load is, for example, a motor 27. In this embodiment, the power converter 1 outputs three-phase AC. Therefore, the power converter 1 is equipped with three power modules 4 corresponding to each phase. In the figure, one power module 4 is enclosed by a dashed line, the power converter 1 is enclosed by a dashed line, and the capacitor module 2 is enclosed by a dotted line. The number of power modules 4 is not limited to three; a single semiconductor module may be configured to output three-phase AC. Furthermore, the configuration of the power converter 1 is not limited to this; it may also be a device that converts the input current from AC to DC.

[0019] <Capacitor Module 2> The configuration of each part of the power converter 1 will be explained in order. First, the capacitor module 2 will be explained. As shown in Figure 5, the capacitor module 2 has the capacitor element 10, capacitor case 12, positive capacitor busbar 7, and negative capacitor busbar 8 described above, as well as a sealing resin 11 that seals the inside of the capacitor case 12. The sealing resin 11 is an insulating material made of epoxy resin or the like.

[0020] The capacitor element 10 smooths DC power. The capacitor element 10 is, for example, a film capacitor having a laminated structure in which a metal foil and a resin film, which serve as internal electrodes, are wound into a roll. The capacitor element 10 has capacitor electrodes 10a on one side and the other side in the Z direction. The capacitor electrode 10a on one side in the Z direction is electrically connected to the positive capacitor busbar 7, and the capacitor electrode 10a on the other side in the Z direction is electrically connected to the negative capacitor busbar 8. For these connections, a conductive bonding material such as solder is used. The positive capacitor busbar 7 and the negative capacitor busbar 8 are manufactured, for example, from copper sheet metal, which has low electrical resistivity and excellent conductivity, by punching and bending. Details of the positive connection terminal 7a and the negative connection terminal 8a will be described later.

[0021] As shown in Figure 4, the portion 7c of the positive capacitor busbar 7 adjacent to the positive terminal 7a and the portion 8c of the negative capacitor busbar 8 adjacent to the negative terminal 8a are stacked with a gap between them. In this embodiment, the direction of stacking of the portion 7c of the positive capacitor busbar 7 and the portion 8c of the negative capacitor busbar 8 is the Z direction. This configuration allows for miniaturization of the positive capacitor busbar 7 and the negative capacitor busbar 8 while ensuring insulation between the portion 7c of the positive capacitor busbar 7 and the portion 8c of the negative capacitor busbar 8. Because the positive capacitor busbar 7 and the negative capacitor busbar 8 are miniaturized, their cost can be reduced. Furthermore, since the positive capacitor busbar 7 and the negative capacitor busbar 8 are arranged to form parallel plates, current flows in opposite directions through the busbars arranged to form parallel plates, thus reducing the path inductance.

[0022] In this embodiment, portion 7c of the positive capacitor busbar 7 and portion 8c of the negative capacitor busbar 8 are laminated together via a non-conductive resin molded member 9. This configuration allows for a reduction in the distance between portion 7c of the positive capacitor busbar 7 and portion 8c of the negative capacitor busbar 8, thereby further miniaturizing the arrangement of the positive capacitor busbar 7 and the negative capacitor busbar 8. The member provided between portion 7c of the positive capacitor busbar 7 and portion 8c of the negative capacitor busbar 8 is not limited to a non-conductive resin molded member 9, but may be other non-conductive materials such as insulating paper.

[0023] The capacitor case 12 is formed in a bottomed cylindrical shape from an insulating resin material such as PPS or PBT. The positive capacitor busbar 7 and the negative capacitor busbar 8 protrude from the opening 12a of the capacitor case 12. In this embodiment, since the opening 12a of the capacitor case 12 is located on the side of the power module 4, the positive capacitor busbar 7 and the negative capacitor busbar 8 are bent after protruding from the opening 12a of the capacitor case 12 toward the power module 4. The direction in which the opening 12a of the capacitor case 12 is provided is not limited to this, and for example, it may be on one side in the Z direction. When the opening 12a of the capacitor case 12 is provided on the side of the power module 4, the lengths of the positive capacitor busbar 7 and the negative capacitor busbar 8 can be shortened. Since the lengths of the positive capacitor busbar 7 and the negative capacitor busbar 8 are shortened, the cost of the positive capacitor busbar 7 and the negative capacitor busbar 8 can be reduced. The capacitor case 12 is integrally molded together with a plurality of metal collars 20. The capacitor case 12 is fixed to the housing 23 via a metal collar 20 using housing fixing screws 22, as shown in Figure 17.

[0024] In this embodiment, as shown in Figure 8, the portion of the capacitor case 12 that faces the housing 23 is thermally connected to the housing 23 via a heat transfer member 28. The portion of the housing 23 to which the capacitor case 12 is thermally connected is the bottom wall 23a. The heat transfer member 28 is, for example, grease. This configuration reduces the thermal resistance between the capacitor module 2 and the housing 23, allowing the heat generated in the capacitor element 10 and the heat transferred to the capacitor element 10 via the positive capacitor busbar 7 and the negative capacitor busbar 8 to be dissipated to the housing 23 more efficiently. Furthermore, when the heat dissipation member is grease, its thickness can be reduced compared to other heat dissipation members, thus reducing the distance between the capacitor case 12 and the bottom wall 23a. As the distance between the capacitor case 12 and the bottom wall 23a is reduced, the thermal resistance between the capacitor module 2 and the housing 23 can be further reduced.

[0025] <Power Module 4> Next, the power module 4 will be described. As shown in Figure 2, the power module 4 has one or more semiconductor chips 4a and multiple electrode terminals 4b. In this embodiment, the power module 4 has two semiconductor chips 4a, which are shown by dashed lines. The multiple electrode terminals 4b are provided protruding outward from the main body portion of the power module 4 that houses the semiconductor chips 4a. The main body portion of the power module 4 is a sealing resin that surrounds the semiconductor chips 4a. The semiconductor chips 4a and the electrode terminals 4b on the side of the semiconductor chips 4a are sealed with resin. As shown in Figure 11, the main body portion of the power module 4 is formed in the shape of a rectangular parallelepiped and has a first side surface 4c, a second side surface 4d perpendicular to the first side surface 4c, a third side surface 4e facing the second side surface 4d, and a fourth side surface 4f facing the first side surface 4c.

[0026] The multiple electrode terminals 4b are made of, for example, copper, which has low electrical resistivity and excellent conductivity. The first electrode terminal 4b1, which is an electrode terminal 4b, is electrically connected to the positive electrode connection terminal 7a, as shown in Figure 2. The second electrode terminal 4b2, which is an electrode terminal 4b, is electrically connected to the negative electrode connection terminal 8a. The first electrode terminal 4b1 and the second electrode terminal 4b2 are terminals with different potentials. The first electrode terminal 4b1 and the second electrode terminal 4b2 are connected to the battery 26 via the capacitor module 2.

[0027] The third electrode terminal 4b3, which is electrode terminal 4b, is electrically connected to the output connection terminal 17a of the output busbar 17. The third electrode terminal 4b3 is a terminal for outputting power converted into alternating current by the semiconductor chip 4a. The third electrode terminal 4b3 is located on the side of the power module 4 opposite to the capacitor module 2, and is positioned with the semiconductor chip 4a in between it and the capacitor module 2. With this configuration, the third electrode terminal 4b3 does not protrude in the Y direction, so the size of the power module 4 in the Y direction can be reduced. Because the size of the power module 4 in the Y direction is reduced, the size of the power converter 1 in the Y direction can be miniaturized.

[0028] The fourth electrode terminal 4b4, which is the electrode terminal 4b, is electrically connected to the control board 24, as shown in Figure 16. The power module 4 has one or more fourth electrode terminals 4b4, and the fourth electrode terminal 4b4 is a control electrode terminal involved in the control of the power module 4. In this embodiment, as shown in Figure 11, the power module 4 has one fourth electrode terminal 4b4, but it may also have a configuration with multiple fourth electrode terminals 4b4. In this embodiment, the fourth electrode terminal 4b4 protrudes from the third side surface 4e, but it is not limited to this, and may be arranged to protrude from other sides of the power module 4.

[0029] In this embodiment, the positive electrode connection terminal 7a and the first electrode terminal 4b1 are connected by welding or screws, the negative electrode connection terminal 8a and the second electrode terminal 4b2 are connected by welding or screws, and the output connection terminal 17a and the third electrode terminal 4b3 are connected by welding or screws. Furthermore, the positive electrode connection terminal 7a and the positive electrode input connection terminal 13a, which is the end of the positive electrode input busbar 13, are connected by welding or screws, and the negative electrode connection terminal 8a and the negative electrode input connection terminal 14a, which is the end of the negative electrode input busbar 14, are connected by welding or screws. This configuration suppresses the generation of additional members and additional space required to connect these terminals. Because the generation of additional members and additional space is suppressed, the power converter 1 can be made smaller and less expensive. In this embodiment, as shown in Figure 2, the terminals are connected by welding, but if these terminals are connected by screws, the connection can be easily attached and detached. Because the connection can be easily attached and detached, if one of the two connected parts fails, the failed part can be easily replaced.

[0030] In this embodiment, as shown in Figure 1, a plurality of power modules 4 are provided, and the power modules 4 are arranged in a row in the Y direction on the base 5. This configuration allows the power modules 4 to be arranged in parallel in the Y direction, thus enabling miniaturization of the power converter 1. The portion of the power module 4 facing the base 5 has, for example, an exposed copper plate. The portion of the copper plate exposed from the power module 4 is thermally connected to the base 5 via a bonding material such as solder. This configuration allows the heat generated in the power module 4 to be efficiently dissipated to the base 5.

[0031] The semiconductor chip 4a may be a power control semiconductor element such as a MOSFET (Metal Oxide Field Effect Transistor), an IGBT (Insulated Gate Bipolar Transistor), or a freewheeling diode. However, the semiconductor chip 4a is not limited to these and may be other semiconductor elements such as bipolar transistors. Alternatively, an RC-IGBT (Reverse Conducting IGBT), which integrates a switching element and a freewheeling diode, may also be used.

[0032] The semiconductor chip 4a is formed on a semiconductor substrate made of materials such as silicon, silicon carbide, or gallium nitride, and a wide-bandgap semiconductor element with a wider bandgap than silicon can be used for the semiconductor chip 4a. When a MOSFET formed from silicon carbide, which is a wide-bandgap semiconductor element, is used, the time change amount di / dt of the current generated during switching can be made larger than that of a MOSFET formed from silicon. In addition, wide-bandgap semiconductor elements have low on-resistance, low loss, and low heat generation, so the chip area can be reduced. As the chip area is reduced, the power module 4 can be miniaturized.

[0033] <Input Busbar 3> Next, the input busbar 3 will be described. As shown in Figure 13, the input busbar 3 has a positive input busbar 13 provided with a positive input connection terminal 13a and a positive input connection portion 13b, and a negative input busbar 14 provided with a negative input connection terminal 14a and a negative input connection portion 14b. From the viewpoint of power efficiency, the positive input busbar 13 and the negative input busbar 14 are made of copper, for example, which has low electrical resistivity and excellent conductivity. The positive input connection terminal 13a and the negative input connection terminal 14a are connected to the capacitor module 2 as shown in Figure 2. The positive input connection portion 13b and the negative input connection portion 14b are connected to an external battery 26. The positive input connection portion 13b and the negative input connection portion 14b have through holes for screw insertion so that they can be fastened to terminals provided on the battery 26 with screws.

[0034] In this embodiment, the main bodies of the positive input busbar 13 and the negative input busbar 14 are laminated via a non-conductive resin molded member 15, as shown in Figure 13. In the figure, the main body of the positive input busbar 13 is the main body portion 13c, and the main body of the negative input busbar 14 is the main body portion 14c. In this embodiment, the main bodies of the positive input busbar 13 and the negative input busbar 14 are arranged in parallel. By laminating the main bodies of the positive input busbar 13 and the negative input busbar 14 via a non-conductive resin molded member 15, insulation between the positive input busbar 13 and the negative input busbar 14 can be ensured while suppressing a predetermined insulation distance. Because the insulation distance is suppressed, the height in the Z direction of the laminated positive input busbar 13 and the negative input busbar 14 can be suppressed. Because the height in the Z direction is suppressed, the power converter 1 can be miniaturized.

[0035] In this embodiment, the main bodies of the positive input busbar 13 and the negative input busbar 14 and the resin molded member 15 are integrally molded from resin 16 together with one or more metal collars 20, and the input busbar 3 is fixed to the housing 23 via the metal collars 20. The resin 16 is, for example, an insulating resin material such as PPS or PBT. As shown in Figure 17, the input busbar 3 is fixed to the housing 23 by screws 22 for housing fixing via the metal collars 20. In this embodiment, one metal collar 20 is provided, but the number of metal collars 20 is not limited to this, and a configuration with multiple metal collars 20 is also possible.

[0036] This configuration suppresses the need for additional components and space to fix the input busbar 3. Because the need for additional components and space is suppressed, the power converter 1 can be miniaturized and its cost reduced. Furthermore, since the input busbar 3 is fixed via the metal collar 20, the fixed state of the input busbar 3 can be maintained stably for a long period. Additionally, by bringing the coefficient of thermal expansion of the resin 16 closer to the coefficient of thermal expansion of the positive input busbar 13 and the negative input busbar 14, peeling of the resin 16 due to temperature rise of the positive input busbar 13 and the negative input busbar 14, or cracking of the resin 16, can be suppressed.

[0037] <Output Terminal Block 6> Next, the output terminal block 6 formed by the output busbar 17 will be described. As shown in Figure 15, the output busbar 17 has an output connection terminal 17a that is electrically connected to the third electrode terminal 4b3, and an output connection portion 17b that is connected to an external motor 27. From the viewpoint of power efficiency, the output busbar 17 is made of copper, for example, which has low electrical resistivity and excellent conductivity. In this embodiment, the power converter 1 is equipped with three output busbars 17, and as shown in Figure 14, the three output connection terminals 17a are the same shape and arranged at the same pitch. The output connection portion 17b has a through hole for screw insertion so that it can be fastened with a terminal provided on the motor 27 by screw.

[0038] In this embodiment, the output busbar 17 has a sensor core 18 for detecting alternating current. The sensor core 18 is provided so as to surround the main body portion of the output busbar 17. The sensor core 18 is the part that detects the current. By placing a magnetoelectric conversion element in the gap portion provided in the sensor core 18, the magnitude of the alternating current can be obtained from the output of the magnetoelectric conversion element. The magnetoelectric conversion element is connected to the control board 24. The magnetoelectric conversion element is, for example, a Hall element. The magnetoelectric conversion element is not limited to a Hall element; it may also be a magnetoresistive element. Alternatively, the magnitude of the alternating current may be detected by winding a coil around the sensor core 18.

[0039] The sensor core 18 concentrates the magnetic flux around the output busbar 17, enhancing sensor sensitivity and making it less susceptible to external magnetic noise. Therefore, by using the sensor core 18 to detect AC current, AC current can be measured more accurately. In addition, because overcurrent and abnormal current can be detected quickly, the performance of the protection device is improved, thereby enhancing the safety of the power converter 1.

[0040] In this embodiment, the main body of the output busbar 17 is integrally molded from resin 19 together with one or more metal collars 20, and the output busbar 17 is fixed to the housing 23 via the metal collars 20. The resin 19 is, for example, an insulating resin material such as PPS or PBT. As shown in Figure 17, the output busbar 17 is fixed to the housing 23 by screws 22 for housing fixing via the metal collars 20. In this embodiment, two metal collars 20 are provided, but the number of metal collars 20 is not limited to this.

[0041] By configuring it in this way, it is possible to suppress the generation of additional members and additional spaces for fixing the output bus bar 17. Since the generation of additional members and additional spaces is suppressed, the power conversion device 1 can be miniaturized and the cost can be reduced. In addition, since the output bus bar 17 is fixed via the metal collar 20, the fixed state of the output bus bar 17 can be stably maintained for a long period of time. Further, by making the linear expansion coefficient of the resin 19 close to the thermal expansion coefficient of the output bus bar 17, it is possible to suppress the peeling of the resin 19 due to the temperature rise of the output bus bar 17 or cracks generated in the resin 19.

[0042] <Control board 24> Next, the control board 24 will be described. As shown in FIG. 16, the control board 24 includes a drive circuit 25 electrically connected to the fourth electrode terminal 4b4 which is a control electrode terminal, and a transformer 21 electrically connected to the drive circuit 25 by a pattern provided on the control board 24 and driving the power module 4. The control board 24 is, for example, a printed board composed of a multilayer board. The drive circuit 25 has, as an electronic component 25a, an IC or the like that controls the on and off of a semiconductor chip 4a which is a switching element such as an IGBT. The fourth electrode terminal 4b4 is inserted into a through hole of the control board 24 and soldered to be electrically connected to the drive circuit 25.

[0043] By controlling the power module 4 with the control board 24 having the drive circuit 25 and the transformer 21 in this way, the power module 4 can be efficiently controlled. In addition, since the circuits and electrical components for controlling the power module 4 are collectively provided on the control board 24, the power conversion device 1 can be miniaturized and the cost can be reduced.

[0044] In the present embodiment, as shown in FIG. 16, the control board 24 is arranged to overlap the power module 4 with a gap. By configuring it in this way, since the control board 24 does not protrude greatly in the X direction and the Y direction where the components of the power conversion device 1 are not arranged, the power conversion device 1 can be miniaturized.

[0045] When viewed perpendicular to the substrate surface of the control board 24, at least a portion of the positive capacitor busbar 7, negative capacitor busbar 8, input busbar 3, and output busbar 17 overlap the control board 24. In this embodiment, as shown in Figure 2, a portion of the positive capacitor busbar 7, negative capacitor busbar 8, input busbar 3, and output busbar 17 overlap the control board 24. With this configuration, the control board 24 does not protrude significantly in the X and Y directions where no components are located, thus enabling miniaturization of the power converter 1 while maintaining the size of the control board 24.

[0046] In this embodiment, the control board 24 is provided on the open side of the housing 23 and is fixed to the housing 23 by screws 22 through insertion holes provided in the control board 24. It is preferable that the control board 24 is fixed in multiple places. Fixing the control board 24 in multiple places can improve the vibration resistance and heat dissipation of the control board 24. Note that the configuration is not limited to fixing the control board 24 directly to the housing 23, but may also be used in which a holder having male and female threads is fixed to the housing 23 to support the control board 24. Alternatively, a metal insert nut may be provided on one or both of the resin 16 portion of the input busbar 3 and the resin 19 portion of the output busbar 17 to support the control board 24.

[0047] <Configuration of Connection Terminals> The configuration of the connection terminals, which is the main part of this disclosure, will now be described. Each of the multiple connection terminals is electrically connected to either the power module 4 or the input busbar 3, and is a terminal that can be used for both connections. As described above, the multiple connection terminals are positive connection terminals 7a and negative connection terminals 8a. As shown in Figure 6, the positive connection terminal 7a protrudes from the first side surface 7b of the positive capacitor busbar 7 and is provided along the first side surface 7b in the same shape. As shown in Figure 7, the negative connection terminal 8a protrudes from the first side surface 8b of the negative capacitor busbar 8 and is provided along the first side surface 8b in the same shape.

[0048] By configuring it in this way, the input bus bar 3 can be provided on either one side or the other side in the Y direction. FIG. 2 shows a configuration in which the input bus bar 3 is provided on one side in the Y direction, and FIG. 3 shows a configuration in which the input bus bar 3 is provided on the other side in the Y direction. Since the input bus bar 3 can be provided on either one side or the other side in the Y direction without changing the configuration of the power conversion device 1, the arrangement of the input bus bar 3 can be changed according to the arrangement of the external battery 26. Since the arrangement of the input bus bar 3 can be changed without changing the configuration of the power conversion device 1, it is not necessary to prepare different capacitor modules 2, and it is also not necessary to secure additional components and additional space for wiring, so the components constituting the power conversion device 1 can be made common. Since the components constituting the power conversion device 1 are made common, the power conversion device 1 can be miniaturized and cost-reduced without changing the specifications of the components.

[0049] In the present embodiment, as shown in FIG. 6, the respective positive electrode connection terminals 7a of the positive electrode capacitor bus bar 7 are arranged at the same pitch. As shown in FIG. 7, the respective negative electrode connection terminals 8a of the negative electrode capacitor bus bar 8 are arranged at the same pitch. By configuring it in this way, as shown in FIGS. 2 and 3, even if the arrangement of the input bus bar 3 is changed, the arrangements of the plurality of power modules 4 can be collectively changed according to the arrangement of the input bus bar 3, so that the productivity of the power conversion device 1 can be improved. In addition, the positive electrode connection terminal 7a and the negative electrode connection terminal 8a can be easily manufactured.

[0050] As shown in Figures 2 and 3, the positive terminal 7a and the negative terminal 8a are arranged side by side in the Y direction, but the arrangement of the positive terminal 7a and the negative terminal 8a is not limited to this. As shown in Figure 9, the positive terminal 7a and the negative terminal 8a may also be arranged side by side in the Z direction. In Figure 9, the positive terminal 7a is provided on one side in the Z direction and the negative terminal 8a is provided on the other side in the Z direction, but the opposite arrangement is also acceptable. Even with the configuration shown in Figure 9, as long as each of the positive terminal 7a and each of the negative terminal 8a are arranged at the same pitch, even if the arrangement of the input busbar 3 is changed, the arrangement of multiple power modules 4 can be changed together according to the arrangement of the input busbar 3, thereby improving the productivity of the power converter 1.

[0051] In this embodiment, as shown in Figure 4, the positive electrode connection terminals 7a and negative electrode connection terminals 8a are arranged alternately along one direction at predetermined intervals, and the set of connection terminals 29, consisting of one positive electrode connection terminal 7a and one negative electrode connection terminal 8a adjacent to one positive electrode connection terminal 7a, is arranged at the same pitch. As shown in Figure 2, the first electrode terminal 4b1 connected to the positive electrode connection terminal 7a, the second electrode terminal 4b2 connected to the negative electrode connection terminal 8a, the positive electrode input connection terminal 13a connected to the positive electrode connection terminal 7a, and the negative electrode input connection terminal 14a connected to the negative electrode connection terminal 8a are all arranged in a line.

[0052] This configuration reduces the distance between the capacitor module 2, the power module 4, and the input busbar 3, enabling an electrical connection between the capacitor module 2, the power module 4, and the input busbar 3. Furthermore, the reduced distance between the capacitor module 2, the power module 4, and the input busbar 3 suppresses heat generation in each busbar. Additionally, since all connections between the capacitor module 2, the power module 4, and the input busbar 3 can be made from one side in the Z-direction, the productivity of the power converter 1 can be improved.

[0053] In this embodiment, the number of positive electrode connection terminals 7a and negative electrode connection terminals 8a is the sum of the number of first electrode terminals 4b1 and second electrode terminals 4b2 in the power module 4, plus the number of positive electrode input connection terminals 13a and negative electrode input connection terminals 14a. Therefore, since no unnecessary positive electrode connection terminals 7a or negative electrode connection terminals 8a are generated, the power converter 1 can be made lower cost and smaller.

[0054] In this embodiment, the input busbar 3 and the positive capacitor busbar 7 are connected at either one end or the other end of the same longitudinal direction on the same side of the capacitor case 12. Figure 2 shows a configuration in which the input busbar 3 and the positive capacitor busbar 7 are connected at one end in the Y direction. With this configuration, since the positive electrode with the higher voltage is provided at the end, it is not necessary to ensure an insulating distance on both sides of the positive electrode, and thus the power converter 1 can be made smaller.

[0055] In this embodiment, the connection terminals are arranged in a line along one direction, and the arrangement of the power module 4, along with the output busbar 17 and base 5, is moved along the direction in which the connection terminals are arranged, according to the arrangement of the connection terminals to which the input busbar 3 is connected. In the configurations shown in Figures 2 and 3, the connection terminals are arranged along the Y direction. In the configuration of Figure 2, where the input busbar 3 is connected to the connection terminals on one side in the Y direction, and in the configuration of Figure 3, where the input busbar 3 is connected to the connection terminals on the other side in the Y direction, the arrangement of the power module 4, along with the output busbar 17 and base 5, is moved. With this configuration, the output busbar 17, base 5, and power module 4 can be moved as a whole, eliminating the need to change their arrangement individually, thus improving the productivity of the power converter 1.

[0056] When the power converter 1 is an inverter, the output connection section 17b is connected to a three-phase AC motor 27. In this case, the AC interface is relatively large, so the DC power supply interface connected to the positive input connection section 13b and the negative input connection section 14b is often located on either the left or right side when the AC interface is facing forward. Therefore, there is a growing need for flexibility in the power converter 1 to accommodate the DC interface being located on either the left or right side. The power converter 1 of this disclosure can accommodate the DC interface being located on either the left or right side.

[0057] <Example of Installation of Power Converter 1> An example of the installation of the power converter 1 will be explained using Figure 19. The power converter 1 is, for example, a device mounted on a vehicle 30, and its housing 23 is mounted on the drive unit 31 of the vehicle 30. The vehicle 30 has a drive unit 31 such as an engine, transmission, gearbox, and motor. When the power converter 1 is an inverter, it is often directly mounted on at least one of the drive units 31 in the vehicle 30, such as the engine, transmission, gearbox, and motor. The device mounted on the drive unit 31 is required to be sized to fit within the projected area of ​​the drive unit 31.

[0058] With the power converter 1 configured as described above, even if the power converter 1 is directly mounted on the drive unit 31 of a vehicle 30 that has strict requirements for miniaturization, the power converter 1 is small enough to fit within the projected area of ​​the drive unit 31, thus meeting the miniaturization requirements. Furthermore, since the capacitor module 2, input busbar 3, and output terminal block 6 are fixed to the housing 23 via metal collars 20, the vibration resistance of the power converter 1 is ensured without the need for additional fixing members, even if the power converter 1 is directly mounted on the drive unit 31, which is a source of vibration.

[0059] As described above, the power conversion device 1 according to Embodiment 1 comprises one or more power modules 4, a capacitor module 2 having a positive capacitor busbar 7 and a negative capacitor busbar 8, one side of which is electrically connected to a capacitor element 10 and the other side protruding from the same side of the capacitor case 12, and an input busbar 3 having a positive input busbar 13 and a negative input busbar 14 for inputting and outputting DC power to the capacitor element 10. Multiple connection terminals are provided at the other end of each of the positive capacitor busbar 7 and the negative capacitor busbar 8 that protrude from the capacitor case 12, and each of the multiple connection terminals is electrically connected to either the power module 4 or the input busbar 3, and is a terminal that can be used for both connections, so the arrangement of the input busbars 3 can be changed without changing the configuration of the power conversion device 1. Since the arrangement of the input busbar 3 can be changed without altering the configuration of the power converter 1, it becomes unnecessary to manufacture different capacitor modules 2, and it also eliminates the need for additional components and space for routing wiring, thus allowing for the standardization of components in the power converter 1. Because the components in the power converter 1 are standardized, the power converter 1 can be miniaturized and its cost reduced without changing the specifications of the components.

[0060] If the positive terminals 7a of the positive capacitor busbar 7 are arranged at the same pitch, and the negative terminals 8a of the negative capacitor busbar 8 are arranged at the same pitch, then even if the arrangement of the input busbar 3 is changed, the arrangement of multiple power modules 4 can be changed collectively according to the arrangement of the input busbar 3, thereby improving the productivity of the power converter 1.

[0061] When the positive terminal 7a and negative terminal 8a are arranged alternately along one direction at predetermined intervals, and a set of connection terminals 29 consisting of one positive terminal 7a and one negative terminal 8a adjacent to that positive terminal 7a is arranged at the same pitch, and the first electrode terminal 4b1 connected to the positive terminal 7a, the second electrode terminal 4b2 connected to the negative terminal 8a, the positive input connection terminal 13a connected to the positive terminal 7a, and the negative input connection terminal 14a connected to the negative terminal 8a are all arranged in a line, the distance between the capacitor module 2 and the power module 4 and input busbar 3 can be reduced, and the capacitor module 2 can be electrically connected to the power module 4 and input busbar 3. Furthermore, because the distance between the capacitor module 2 and the power module 4 and input busbar 3 is reduced, heat generation in each busbar can be suppressed. Furthermore, since the connections between the capacitor module 2, the power module 4, and the input busbar 3 can all be made from one side in the Z direction, the productivity of the power converter 1 can be improved.

[0062] When the positive electrode terminal 7a and the first electrode terminal 4b1 are connected by welding or screws, the negative electrode terminal 8a and the second electrode terminal 4b2 are connected by welding or screws, and the output terminal 17a and the third electrode terminal 4b3 are connected by welding or screws, the need for additional members and additional space to connect these terminals can be suppressed. Because the need for additional members and additional space is suppressed, the power converter 1 can be made smaller and less expensive. Furthermore, when these terminals are connected by screws, the connection can be easily attached and detached. Because the connection can be easily attached and detached, if one of the two connected parts fails, the failed part can be easily replaced.

[0063] When the input busbar 3 and the positive capacitor busbar 7 are connected at one end or the other end of the same longitudinal direction on the same side of the capacitor case 12, the positive electrode with the higher voltage is provided at the end, eliminating the need to ensure an insulating distance on both sides of the positive electrode, thus allowing the power converter 1 to be miniaturized.

[0064] When the portion 7c of the positive capacitor busbar 7 adjacent to the positive terminal 7a and the portion 8c of the negative capacitor busbar 8 adjacent to the negative terminal 8a are stacked with a gap between them, the positive capacitor busbar 7 and the negative capacitor busbar 8 can be miniaturized while ensuring insulation between the portion 7c of the positive capacitor busbar 7 and the portion 8c of the negative capacitor busbar 8. As the positive capacitor busbar 7 and the negative capacitor busbar 8 are miniaturized, their cost can be reduced. Furthermore, since the positive capacitor busbar 7 and the negative capacitor busbar 8 are arranged to form parallel plates, current flows in opposite directions through the busbars arranged to form parallel plates, thus reducing the path inductance.

[0065] If the connection terminals are arranged in a line along one direction, and the arrangement of the power module 4, along with the output busbar 17 and base 5, is moved along the direction in which the connection terminals are arranged, the output busbar 17, base 5, and power module 4 can be moved as a whole, eliminating the need to change their arrangement individually, thus improving the productivity of the power converter 1.

[0066] If the output busbar 17 has a sensor core 18 for detecting alternating current, the sensor core 18 concentrates the magnetic flux around the output busbar 17, increasing sensor sensitivity and making it less susceptible to external magnetic noise. Therefore, by detecting the alternating current using the sensor core 18, the alternating current can be measured more accurately. In addition, since overcurrents and abnormal currents can be detected quickly, the performance of the protection device is improved, and the safety of the power converter 1 can be enhanced.

[0067] When the main bodies of the positive input busbar 13 and the negative input busbar 14 are laminated via a non-conductive resin molded member 15, it is possible to suppress a predetermined insulation distance while ensuring insulation between the positive input busbar 13 and the negative input busbar 14. Because the insulation distance is suppressed, the height in the Z direction of the laminated positive input busbar 13 and the negative input busbar 14 can be suppressed. Because the height in the Z direction is suppressed, the power converter 1 can be miniaturized.

[0068] When the main bodies of the positive input busbar 13 and the negative input busbar 14 and the resin molded member 15 are integrally molded with one or more metal collars 20 using resin 16, and the input busbar 3 is fixed to the housing 23 via the metal collars 20, the generation of additional members and additional space for fixing the input busbar 3 can be suppressed. Because the generation of additional members and additional space is suppressed, the power converter 1 can be made smaller and less expensive. In addition, because the input busbar 3 is fixed via the metal collars 20, the fixed state of the input busbar 3 can be maintained stably for a long period of time.

[0069] When the main body of the output busbar 17 is integrally molded from resin 19 together with one or more metal collars 20, and the output busbar 17 is fixed to the housing 23 via the metal collars 20, the generation of additional members and additional space for fixing the output busbar 17 can be suppressed. Because the generation of additional members and additional space is suppressed, the power converter 1 can be made smaller and less expensive. In addition, because the output busbar 17 is fixed via the metal collars 20, the fixed state of the output busbar 17 can be maintained stably for a long period of time.

[0070] When the portion of the capacitor case 12 that is on the side of the housing 23 is thermally connected to the housing 23 via the heat transfer member 28, the thermal resistance between the capacitor module 2 and the housing 23 can be reduced, allowing the heat generated in the capacitor element 10 and the heat transferred to the capacitor element 10 via the positive capacitor busbar 7 and the negative capacitor busbar 8 to be dissipated to the housing 23 more efficiently.

[0071] When the control board 24 is placed on top of the power module 4 with a gap in between, the control board 24 does not protrude significantly in the X and Y directions where the components of the power converter 1 are not located, thus allowing the power converter 1 to be miniaturized.

[0072] If the control board 24 has a drive circuit 25 electrically connected to the fourth electrode terminal 4b4, which is a control electrode terminal, and a transformer 21 electrically connected to the drive circuit 25 by a pattern provided on the control board 24 and driving the power module 4, then the power module 4 can be efficiently controlled by the control board 24 having the drive circuit 25 and the transformer 21. Furthermore, since the circuits and electrical components for controlling the power module 4 are provided collectively on the control board 24, the power conversion device 1 can be made smaller and less expensive.

[0073] When viewed perpendicular to the substrate surface of the control board 24, if at least a portion of the positive capacitor busbar 7, negative capacitor busbar 8, input busbar 3, and output busbar 17 overlap the control board 24, the control board 24 will not protrude significantly in the X and Y directions where no components of the power converter 1 are located. Therefore, the power converter 1 can be miniaturized while maintaining the size of the control board 24.

[0074] If the housing 23 is mounted on the drive unit 31 of the vehicle 30, the power converter 1 with the above configuration will fit within the projected area of ​​the drive unit 31. Therefore, even if it is directly mounted on the drive unit 31 of the vehicle 30, which has strict requirements for miniaturization, the power converter 1 is already miniaturized, thus meeting the miniaturization requirements for the power converter 1.

[0075] Furthermore, while this disclosure describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments are not limited to the application of a particular embodiment, but are applicable individually or in various combinations to the embodiments. Accordingly, countless variations not illustrated are conceivable within the scope of the art disclosed in this specification. For example, these include modifying, adding, or omitting at least one component, or even extracting at least one component and combining it with a component from another embodiment.

[0076] 1 Power converter, 1 Power converter, 2 Capacitor module, 3 Input busbar, 4 Power module, 4a Semiconductor chip, 4b Electrode terminals, 4b1 First electrode terminal, 4b2 Second electrode terminal, 4b3 Third electrode terminal, 4b4 Fourth electrode terminal, 4c First side, 4d Second side, 4e Third side, 4f Fourth side, 5 Base, 6 Output terminal block, 7 Positive capacitor busbar, 7a Positive connection terminal, 7b First side, 7c Part, 8 Negative capacitor busbar, 8a Negative connection terminal, 8b First side, 8c Part, 9 Resin molded member, 10 Capacitor element, 10a Capacitor electrode, 11 Sealing resin, 12 Capacitor case, 12a Opening, 13 Positive input busbar, 13a Positive input connection terminal, 13b Positive input connection part, 13c Main body part, 14 Negative input busbar, 14a 14b Negative input connection terminal, 14c Negative input connection part, 15 Main body part, 16 Resin molded member, 17 Resin, 17 Output busbar, 17a Output connection terminal, 17b Output connection part, 18 Sensor core, 19 Resin, 20 Metal collar, 21 Transformer, 22 Screw, 23 Housing, 23a Bottom wall, 24 Control board, 25 Drive circuit, 25a Electronic component, 26 Battery, 27 Motor, 28 Heat transfer member, 29 Set of connection terminals, 30 Vehicle, 31 Drive unit

Claims

1. A power conversion device comprising: one or more semiconductor chips and one or more power modules having a plurality of electrode terminals electrically connected to the semiconductor chips; one or more capacitor elements, a capacitor case housing the capacitor elements, and a capacitor module having a positive capacitor busbar and a negative capacitor busbar electrically connected to the capacitor elements on one side and protruding from the same side of the capacitor case on the other side; and an input busbar having a positive input busbar and a negative input busbar connected to the outside and inputting and outputting DC power to the capacitor elements, wherein a plurality of connection terminals are provided at the other end of the positive capacitor busbar and the negative capacitor busbar that protrude from the capacitor case, and each of the plurality of connection terminals is a terminal that can be used for both connections, electrically connected to either the power module or the input busbar, and can be connected to both the power module and the input busbar.

2. The power conversion device according to claim 1, wherein each of the positive terminals, which are the connection terminals of the positive capacitor busbar, are arranged at the same pitch, and each of the negative terminals, which are the connection terminals of the negative capacitor busbar, are arranged at the same pitch.

3. The power conversion device according to claim 1 or 2, wherein the positive electrode connection terminals, which are the connection terminals of the positive electrode capacitor busbar, and the negative electrode connection terminals, which are the connection terminals of the negative electrode capacitor busbar, are arranged alternately in one direction at predetermined intervals, and a set of connection terminals consisting of one positive electrode connection terminal and one negative electrode connection terminal adjacent to the one positive electrode connection terminal is arranged at the same pitch, and the first electrode terminal, which is the electrode terminal connected to the positive electrode connection terminal, the second electrode terminal, which is the electrode terminal connected to the negative electrode connection terminal, the positive electrode input connection terminal, which is the end of the positive electrode input busbar connected to the positive electrode connection terminal, and the negative electrode input connection terminal, which is the end of the negative electrode input busbar connected to the negative electrode connection terminal, are arranged in a row.

4. The power conversion device according to any one of claims 1 to 3, further comprising one or more output busbars that input and output alternating current, each having an output connection terminal electrically connected to a third electrode terminal which is an electrode terminal, wherein the positive electrode connection terminal of the positive electrode capacitor busbar and the first electrode terminal which is an electrode terminal are connected by welding or screws, the negative electrode connection terminal of the negative electrode capacitor busbar and the second electrode terminal which is an electrode terminal are connected by welding or screws, and the output connection terminal and the third electrode terminal are connected by welding or screws.

5. The power conversion device according to any one of claims 1 to 4, wherein the input busbar and the positive capacitor busbar are connected at one end or the other end in the longitudinal direction on the same side of the capacitor case.

6. The power conversion device according to any one of claims 1 to 5, wherein the portion of the positive capacitor busbar and the portion of the negative capacitor busbar adjacent to the connection terminal are stacked with a gap between them.

7. A power converter according to any one of claims 1 to 6, further comprising: one or more output busbars that input and output alternating current, each having an output connection terminal electrically connected to a third electrode terminal which is an electrode terminal; and a base made of metal on which the power module is mounted, wherein the connection terminals are arranged in a line along one direction, and the arrangement of the power module, together with the output busbars and the base, is moved along the direction in which the connection terminals are arranged, in accordance with the arrangement of the connection terminals to which the input busbars are connected.

8. The power conversion device according to any one of claims 1 to 7, further comprising one or more output busbars that input and output alternating current, having an output connection terminal electrically connected to a third electrode terminal which is the electrode terminal, wherein the output busbars have a sensor core for detecting alternating current.

9. The power conversion device according to any one of claims 1 to 8, wherein the main body portions of the positive input busbar and the negative input busbar are laminated via a non-conductive resin molded member.

10. The power conversion device according to claim 9, further comprising a housing that houses the power module, the capacitor module, and the input busbar, wherein the main body portions of the positive input busbar and the negative input busbar and the resin molded member are integrally molded from resin together with one or more metal collars, and the input busbar is fixed to the housing via the metal collar.

11. A power conversion device according to any one of claims 1 to 10, further comprising: one or more output busbars having an output connection terminal electrically connected to a third electrode terminal which is an electrode terminal, for inputting and outputting alternating current; and a housing housing the power module, the capacitor module, the input busbar, and the output busbar, wherein the main body portion of the output busbar is integrally molded from resin together with one or more metal collars, and the output busbar is fixed to the housing via the metal collars.

12. The power conversion device according to any one of claims 1 to 11, further comprising a housing that houses the power module, the capacitor module, and the input busbar, wherein the portion of the capacitor case on the housing side is thermally connected to the housing via a heat transfer member.

13. The power conversion device according to any one of claims 1 to 12, further comprising a control board on which one or more electronic components are mounted, wherein the control board is arranged on top of the power module with a gap between them.

14. A power conversion device according to any one of claims 1 to 13, further comprising a control board on which one or more electronic components are mounted, wherein the power module has one or more control electrode terminals which are electrode terminals electrically connected to the control board, and the control board has a drive circuit electrically connected to the control electrode terminals, and a transformer electrically connected to the drive circuit by a pattern provided on the control board and driving the power module.

15. A power conversion device according to any one of claims 1 to 14, further comprising: one or more output busbars having an output connection terminal electrically connected to a third electrode terminal which is an electrode terminal, for inputting and outputting alternating current; and a control board on which one or more electronic components are mounted, wherein, when viewed in a direction perpendicular to the board surface of the control board, at least a portion of the positive electrode capacitor busbar, the negative electrode capacitor busbar, the input busbar, and the output busbar are arranged in overlapping positions on the control board.

16. The power converter according to any one of claims 1 to 15, further comprising a housing that houses the power module, the capacitor module, and the input busbar, wherein the housing is mounted on the drive system of a vehicle.

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