Power conversion device

Abstract

The present invention provides a power conversion device in which the distance in a first direction between the output terminal of a first switching assembly and the cathode terminal of a first diode assembly is equal to the distance in a first direction between the output terminal of a second switching assembly and the anode terminal of a second diode assembly.

Description

Technical Field

[0001] This invention relates to a power conversion device, and more particularly to a power conversion device that outputs power at three different voltage levels. Background Technology

[0002] Previously, power conversion devices that output power at three different voltage levels were known. For example, such a power conversion device was disclosed in Japanese Patent Application Publication No. 5-83947.

[0003] Japanese Patent Application Publication No. 5-83947 discloses a power conversion device that outputs power at three levels: a high potential, an intermediate potential, and a low potential. The power conversion device described in Japanese Patent Application Publication No. 5-83947 comprises, sequentially from the high potential side to the low potential side, a first switching element, a second switching element, a third switching element, and a fourth switching element connected in series. A freewheeling diode is connected in reverse parallel to each of the first, second, third, and fourth switching elements. That is, the switching elements and diodes form a pair. Furthermore, the power conversion device described in Japanese Patent Application Publication No. 5-83947 includes: a first clamping diode connected to the connection point of the first and second switching elements; and a second clamping diode connected to the connection point of the third and fourth switching elements. The first clamping diode and the second clamping diode are connected in series. Furthermore, the connection point between the first clamping diode and the second clamping diode is connected to the intermediate potential point. Moreover, in the power conversion device described in Japanese Patent Application Publication No. 5-83947, it is configured such that by combining four switching elements and two clamping diodes, power at three potential levels is output (as a three-level circuit).

[0004] In the power conversion device described in Japanese Patent Application Publication No. 5-83947, the switching element and the diode form a single component. Specifically, the power conversion device described in Japanese Patent Application Publication No. 5-83947 includes an upper potential component with a first and a second switching element built in, and a lower potential component with a third and a fourth switching element built in. The upper and lower potential components are respectively arranged with positive, negative, and output terminals along the length of the component in the order of positive terminal, negative terminal, and output terminal. The positive terminal of the upper potential component is connected to the upper potential point. The negative terminal of the lower potential component is connected to the lower potential point. The output terminal of the upper potential component is connected to the cathode of the first clamping diode. The output terminal of the lower potential component is connected to the anode of the second clamping diode.

[0005] Here, although not described in Japanese Patent Laid-Open No. Hei 5-83947, in a conventional power conversion device as described in Japanese Patent Laid-Open No. Hei 5-83947, two diodes built in the same component as the upper potential component and the lower potential component are usually used as two clamping diodes. That is, a conventional power conversion device as described in Japanese Patent Laid-Open No. Hei 5-83947 has the following structure (hereinafter referred to as Structure A). It not only has an upper potential component and a lower potential component, but also has an intermediate potential component. The intermediate potential component has a positive terminal connected to the output terminal of the upper potential component (configured on the cathode side of the first clamping diode), a negative terminal connected to the output terminal of the lower potential component (configured on the anode side of the second clamping diode), and an output terminal connected to the intermediate potential point. In addition, in Structure A, in order to make the surge voltage burdens (Japanese: サージ電圧責務) of the switching elements applied symmetrically between the upper potential side and the lower potential side of the circuit substantially equal (make the surge voltage burden applied to the first switching element and the surge voltage burden applied to the fourth switching element substantially equal, and make the surge voltage burden applied to the second switching element and the surge voltage burden applied to the fourth switching element substantially equal), it is desired to reduce the difference between the length of the wiring connecting the output terminal of the upper potential component and the intermediate potential component and the length of the wiring connecting the output terminal of the lower potential component and the negative terminal of the intermediate potential component.

[0006] However, in the above Structure A, the terminal connected to the output terminal of the upper potential component (the positive terminal of the intermediate potential component) and the terminal connected to the output terminal of the lower potential component (the negative terminal of the intermediate potential component) are provided in one component (the intermediate potential component). In this case, it can be considered that in order to make the length of the wiring connecting the output terminal of the upper potential component and the positive terminal of the intermediate potential component and the length of the wiring connecting the output terminal of the lower potential component and the negative terminal of the intermediate potential component substantially equal, the degree of freedom in the arrangement of the upper potential component, the intermediate potential component, and the lower potential component will become smaller. Therefore, in the power conversion device described in Japanese Patent Laid-Open No. Hei 5-83947, the following problem can be envisioned: in a three-level circuit, in order to make the surge voltage burdens of the switching elements applied symmetrically between the upper potential side and the lower potential side of the circuit substantially equal, the degree of freedom in the arrangement of the components will become smaller. Summary of the Invention

[0007] The problem the invention aims to solve

[0008] The present invention was made to solve the problems mentioned above. One object of the present invention is to provide a power conversion device in a three-level circuit where the degree of freedom in the configuration of the suppression components is reduced, and the surge voltage burden applied to the symmetrical switching elements on the circuit is made equal between the upper potential side and the lower potential side.

[0009] Solution for solving the problem

[0010] To achieve the above objectives, one technical solution of the present invention provides a power conversion device that outputs power at three potential levels: a high potential, an intermediate potential, and a low potential. The power conversion device comprises: a switching assembly including two semiconductor switching elements arranged with a positive terminal, a negative terminal, and an output terminal along a first direction; and a diode assembly including a diode arranged with an anode terminal and a cathode terminal along the first direction. The switching assembly includes: a first switching assembly having a positive terminal, a negative terminal, and an output terminal as the high potential terminal; and a second switching assembly having a positive terminal, a negative terminal, and an output terminal as the high potential terminal. The lower potential terminal has a negative side terminal, a positive side terminal, and an output terminal. The diode assembly includes: a first diode assembly having a cathode terminal connected to the output terminal of a first switching assembly and an anode terminal serving as an intermediate potential terminal; and a second diode assembly having an anode terminal connected to the output terminal of a second switching assembly and a cathode terminal serving as an intermediate potential terminal. The power conversion device is configured such that the distance in a first direction between the output terminal of the first switching assembly and the cathode terminal of the first diode assembly, and the distance in a first direction between the output terminal of the second switching assembly and the anode terminal of the second diode assembly are equal.

[0011] In a power conversion device according to one embodiment of the present invention, as described above, the distance in a first direction between the output terminal of the first switching assembly and the cathode terminal of the first diode assembly, and the distance in a first direction between the output terminal of the second switching assembly and the anode terminal of the second diode assembly, are equal. Therefore, for example, when the first switching assembly, the second switching assembly, the first diode assembly, and the second diode assembly are arranged in a manner along the first direction, it is easy to make the length of the wiring connecting the output terminal of the first switching assembly to the cathode terminal of the first diode assembly, and the length of the wiring connecting the output terminal of the second switching assembly to the anode terminal of the second diode assembly, equal. Furthermore, in the power conversion device of the above-described embodiment, the first diode assembly and the second diode assembly are provided separately. Therefore, unlike the case where the diode connected to the output terminal of the first switching assembly and the diode connected to the output terminal of the second switching assembly are integrated into one assembly, it is possible to separately configure the terminal connected to the output terminal of the first switching assembly (the cathode terminal of the first diode assembly) and the terminal connected to the output terminal of the second switching assembly (the anode terminal of the second diode assembly). Therefore, regardless of the arrangement of the first and second switching components, it is possible to easily (i.e., while reducing the degree of freedom in the arrangement of the suppression components) make the distance in the first direction between the output terminal of the first switching component and the cathode terminal of the first diode component, and the distance in the first direction between the output terminal of the second switching component and the anode terminal of the second diode component, equal. As a result, in a three-level circuit, while reducing the degree of freedom in the arrangement of the suppression components, the circuit inductance present in the commutation circuit of the switching elements can be equalized between the upper and lower potential sides. That is, in a three-level circuit, while reducing the degree of freedom in the arrangement of the suppression components, the surge voltage burden applied to the symmetrical switching elements on the circuit can be equalized between the upper and lower potential sides.

[0012] In the power conversion device of the above-described technical solution, it is preferable that the output terminals of the first switching assembly and the second switching assembly are arranged symmetrically with respect to a centerline along a second direction orthogonal to the first direction, and the cathode terminal of the first diode assembly and the anode terminal of the second diode assembly are arranged symmetrically with respect to the centerline. With this configuration, in the first direction, the distance from the centerline to the output terminal of the first switching assembly on one side can be equal to the distance from the centerline to the output terminal of the second switching assembly on the other side, and the distance from the centerline to the cathode terminal of the first diode assembly on one side can be equal to the distance from the centerline to the anode terminal of the second diode assembly on the other side. As a result, it is easy to achieve a structure in which the distance in the first direction between the output terminals of the first switching assembly and the cathode terminals of the first diode assembly, and the distance in the first direction between the output terminals of the second switching assembly and the anode terminals of the second diode assembly, are equal.

[0013] In this case, it is preferable that the positive, negative, and output terminals of the first switching assembly are arranged symmetrically with respect to the center line as the positive, negative, and output terminals of the second switching assembly, and that the cathode and anode terminals of the first diode assembly are arranged symmetrically with respect to the center line as the anode and cathode terminals of the second diode assembly. With this configuration, using switching assemblies with identical positive, negative, and output terminal configurations in both the first and second switching assemblies allows for easy implementation of a structure where the output terminals of the first and second switching assemblies are arranged symmetrically with respect to the center line. Furthermore, using diode assemblies with identical anode and cathode terminal configurations in both the first and second diode assemblies allows for easy implementation of a structure where the cathode terminals of the first diode assembly are arranged symmetrically with respect to the center line as the anode terminals of the second diode assembly.

[0014] In the aforementioned structure where the output terminals of the first and second switching components are arranged symmetrically with respect to the center line, it is preferable that the first and second switching components are constructed from the same package and arranged symmetrically with respect to the center line, and that the first and second diode components are constructed from the same package and arranged symmetrically with respect to the center line. With this configuration, the arrangement of the output terminals in the switching components is identical in both the first and second switching components, thus easily achieving a structure where the output terminals of the first and second switching components are arranged symmetrically with respect to the center line. Furthermore, the arrangement of the anode and cathode terminals in the diode components is identical in both the first and second diode components, thus easily achieving a structure where the cathode terminals of the first diode component and the anode terminals of the second diode component are arranged symmetrically with respect to the center line.

[0015] In the structure described above, where the output terminals of the first and second switching components are arranged symmetrically with respect to the center line, it is preferable that at least two of the positive, negative, and output terminals of the first switching component are respectively disposed at one end of the first direction and the other end, and at least two of the positive, negative, and output terminals of the second switching component are respectively disposed at one end of the first direction and the other end, and the anode and cathode terminals of the first and second diode components are respectively disposed at the central portion of the first direction. With this configuration, since the anode and cathode terminals of the first and second diode components are respectively disposed at the central portion of the first direction, it is possible to separate the anode and cathode terminals from the ends in the first direction. As a result, for example, when other components are arranged adjacent to the first or second diode component in the first direction, it is possible to suppress an increase in the separation distance of the components used to ensure the insulation distance between terminals in the first direction.

[0016] In this case, it is preferable that the first diode assembly, the first switch assembly, the second switch assembly, and the second diode assembly are arranged in a first direction in the order of the first diode assembly, the first switch assembly, the second switch assembly, and the second diode assembly. The first switch assembly and the second switch assembly are configured such that the shortest distance between any one of the positive, negative, and output terminals of the first switch assembly and any one of the positive, negative, and output terminals of the second switch assembly is at least a predetermined insulation distance (determined by the device). With this configuration, the dielectric strength between the terminals of the first switch assembly on the second switch assembly side and the terminals of the second switch assembly on the first switch assembly side can be effectively ensured.

[0017] In the structure in which the output terminals of the first switching assembly and the second switching assembly are arranged symmetrically with respect to the center line, it is preferable to further include: a first capacitor and a second capacitor connected in series; a positive potential conductor connected to the positive terminal of the first capacitor and the positive terminal of the first switching assembly; a negative potential conductor connected to the negative terminal of the second capacitor and the negative terminal of the second switching assembly; and an intermediate potential conductor connected to the negative terminal of the first capacitor, the positive terminal of the second capacitor, the anode terminal of the first diode assembly, and the cathode terminal of the second diode assembly. The positive and negative potential conductors each include a vertical wall portion, which is configured to extend along a third direction orthogonal to both the first and second directions. The intermediate potential conductor includes a first vertical wall portion and a second vertical wall portion, which are configured to extend along the third direction adjacent to the respective vertical wall portions of the positive and negative potential conductors. With this configuration, since the vertical wall portion of the positive potential conductor and the first vertical wall portion of the intermediate potential conductor, in which currents flow in opposite directions, are arranged adjacent to each other, the inductance of the vertical wall portion of the positive potential conductor and the inductance of the first vertical wall portion of the intermediate potential conductor can be reduced. Furthermore, since the vertical wall portion of the negative potential conductor and the second vertical wall portion of the intermediate potential conductor, in which currents flow in opposite directions, are arranged adjacent to each other, the inductance of the vertical wall portion of the negative potential conductor and the inductance of the second vertical wall portion of the intermediate potential conductor can be reduced.

[0018] In this case, it is preferable that the positive potential conductor and the negative potential conductor each further include a leg configured to extend along a first direction, and the intermediate potential conductor further includes a leg configured to extend along the first direction adjacent to the legs of the positive and negative potential conductors in a third direction. With this configuration, the legs of the positive potential conductor, the negative potential conductor, and the intermediate potential conductor, configured to extend along the first direction, can be used to easily connect the terminals of the first and second switching assemblies, arranged in a positive-side terminal, a negative-side terminal, and an output terminal along the first direction, to the terminals of the first and second diode assemblies, arranged in an anode terminal and a cathode terminal along the first direction.

[0019] In the structure described above, where the output terminals of the first and second switching components are arranged symmetrically with respect to the center line, it is preferable to further include an AC potential conductor. This AC potential conductor is configured to connect to the negative terminal of the first switching component and the positive terminal of the second switching component and extend along a first direction. The AC potential conductor includes a bend that is bent in a manner separate from the area of ​​the control substrate on which at least one of the first and second switching components is disposed. With this configuration, even if the AC potential conductor is disposed near the first or second switching component and extends along the first direction, the bend in the AC potential conductor can easily ensure sufficient space for disposing the control substrate between the AC potential conductor and the first or second switching component.

[0020] In the structure described above, where the output terminals of the first and second switching components are arranged symmetrically with respect to the center line, it is preferable that multiple first and second switching components are connected in parallel, each arranged along a second direction. With this configuration, the direction in which the switching components are connected in parallel (the second direction) is orthogonal to the direction in which the positive, negative, and output terminals of the switching components are arranged, and the anode and cathode terminals of the diode components are arranged (the first direction). Therefore, while maintaining a structure where the distance in the first direction between the output terminals of the first switching component and the cathode terminals of the first diode component, and the distance in the first direction between the output terminals of the second switching component and the anode terminals of the second diode component, are equal, the power capacity of the power conversion device can be increased. Furthermore, when the first switch assembly and the second switch assembly are arranged along the first direction, the direction in which the first switch assembly and the second switch assembly are arranged (the first direction) is orthogonal to the direction in which the parallel-connected switch assemblies are arranged (the second direction). Therefore, compared with the case where all the components are arranged along one direction, it is possible to suppress the power conversion device from becoming too large in one direction.

[0021] In the power conversion device of the above-described technical solution, it is preferable that the power conversion device is a power conversion device mounted on a railway vehicle, wherein the first switch assembly, the second switch assembly, the first diode assembly, and the second diode assembly are arranged in a manner that is a first direction, which is the travel direction of the railway vehicle. With this configuration, since the first switch assembly, the second switch assembly, the first diode assembly, and the second diode assembly are arranged in a manner that is ... Attached Figure Description

[0022] Figure 1 This is a schematic diagram showing a railway vehicle equipped with the power conversion device of the first embodiment.

[0023] Figure 2 This is a circuit diagram of the power conversion device according to the first embodiment.

[0024] Figure 3 This is a circuit diagram of the power conversion section of the power conversion device according to the first embodiment.

[0025] Figure 4 This is a perspective view of the switching assembly of the power conversion device according to the first embodiment.

[0026] Figure 5 This is a perspective view of the diode assembly of the power conversion device according to the first embodiment.

[0027] Figure 6 This is a top view showing the configuration of the switching assembly and diode assembly of the power conversion device according to the first embodiment.

[0028] Figure 7 This is a perspective view of the power conversion section of the power conversion device according to the first embodiment.

[0029] Figure 8 This is a schematic diagram of the power conversion section of the power conversion device of the first embodiment, viewed from the side.

[0030] Figure 9 This is a perspective view of the positive potential conductor of the power conversion device according to the first embodiment.

[0031] Figure 10This is a perspective view of the negative potential conductor of the power conversion device according to the first embodiment.

[0032] Figure 11 This is a perspective view of the first vertical wall portion of the intermediate potential conductor of the power conversion device according to the first embodiment.

[0033] Figure 12 This is a perspective view of the second vertical wall portion of the intermediate potential conductor of the power conversion device according to the first embodiment.

[0034] Figure 13 This is a perspective view of the leg of the intermediate potential conductor of the power conversion device according to the first embodiment.

[0035] Figure 14 This is a perspective view of the AC potential conductor of the power conversion device according to the first embodiment.

[0036] Figure 15 This is a perspective view of the front-side connecting conductor of the power conversion device according to the first embodiment.

[0037] Figure 16 This is a perspective view of the negative-side connecting conductor of the power conversion device according to the first embodiment.

[0038] Figure 17 This is a schematic diagram illustrating the length of the wiring connecting the switching assembly and the diode assembly of the power conversion device of the first embodiment.

[0039] Figure 18 This is a schematic diagram of the power conversion section of the power conversion device according to the second embodiment, viewed from the side.

[0040] Figure 19 This is a schematic diagram of the power conversion section of the power conversion device according to the third embodiment, viewed from the side.

[0041] Figure 20 This is a schematic diagram illustrating the length of the wiring connecting the switching assembly and the diode assembly of the power conversion device of the third embodiment.

[0042] Figure 21 This is a schematic diagram of the power conversion section of the power conversion device according to the fourth embodiment, viewed from the side.

[0043] Figure 22 This is a schematic diagram illustrating the length of the wiring connecting the switching assembly and the diode assembly of the power conversion device of the fourth embodiment.

[0044] Figure 23 This is a schematic diagram of the power conversion section of the power conversion device according to the fifth embodiment, viewed from the side.

[0045] Figure 24 This is a schematic diagram illustrating the length of the wiring connecting the switching assembly and the diode assembly of the power conversion device of the fifth embodiment.

[0046] Figure 25 This is a top view showing the configuration of the switching assembly and diode assembly of the power conversion device in the first modified example of the first embodiment.

[0047] Figure 26 This is a circuit diagram showing the power conversion section of the power conversion device in the second variation of the first embodiment. Detailed Implementation

[0048] Hereinafter, embodiments embodying the present invention will be described with reference to the accompanying drawings.

[0049] [First Implementation]

[0050] Reference Figures 1 to 17 The structure of the power conversion device 100 according to the first embodiment of the present invention will be described below. Furthermore, the power conversion device 100 is a power conversion device mounted on a railway vehicle 10.

[0051] like Figure 1 As shown, the railway vehicle 10 is configured to travel on the track 2 using electricity supplied from the overhead line 1, which serves as an AC power source. In the following description, the direction of travel of the railway vehicle 10 is defined as the X direction, the direction of the sleepers orthogonal to the direction of travel of the railway vehicle 10 is defined as the Y direction, and the vertical direction of the railway vehicle 10 is defined as the Z direction. Furthermore, the upper side (upward direction) and lower side (downward direction) of the railway vehicle 10 are defined as the Z1 side (Z1 direction) and the Z2 side (Z2 direction), respectively. Moreover, the X direction, Y direction, and Z direction are examples of the "first direction," "second direction," and "third direction" in the claims, respectively. Additionally, the "sleeper" in the "sleeper direction" refers to a component that is laid under the track 2 and supports the track 2 in a manner orthogonal to the track 2.

[0052] Railway vehicle 10 includes a body 11, a pantograph 12, a power conversion device 100, and an induction motor 14 that rotates the drive wheel 13 (see reference). Figure 2 ), and other equipment such as air conditioning equipment, control equipment, etc., category 15. A power conversion device 100 is installed on the lower side (Z2 side) of the bottom 11a of the vehicle body 11. The pantograph 12 receives power (collector) supplied to the overhead line 1. The power conversion device 100 utilizes a semiconductor switching element Q (refer to) when the railway vehicle 10 is in motion. Figure 3 The switching action of the induction motor 14 is used to switch the power from the overhead line 1 to control the rotation of the induction motor 14.

[0053] like Figure 2As shown, a single-phase voltage is input from the pantograph 12 to the transformer 17 via the circuit breaker 16. Then, the single-phase voltage is input from the secondary winding 17a of the transformer 17 to the power conversion device 100. The power conversion device 100 includes a converter section 100a and an inverter section 100b. The converter section 100a converts the single-phase voltage input from the secondary winding 17a into a DC voltage. The inverter section 100b converts the DC voltage input from the converter section 100a into an AC voltage. Then, the converted AC voltage is output from the inverter section 100b to the induction motor 14 for driving the railway vehicle 10.

[0054] In the power conversion device 100, the converter section 100a is composed of two power conversion sections 110 connected in parallel. Similarly, the inverter section 100b is composed of three power conversion sections 110 connected in parallel. In the power conversion device 100, the five power conversion sections 110 (the two power conversion sections 110 of the converter section 100a and the three power conversion sections 110 of the inverter section 100b) have substantially the same structure. Therefore, the structure of one power conversion section 110 will be described below. Furthermore, the power conversion device 100 is configured as a three-level circuit capable of outputting power at three levels: a high potential, an intermediate potential, and a low potential.

[0055] like Figure 3 As shown, the power conversion unit 110 includes four semiconductor switching elements Q (first switching element Q1, second switching element Q2, third switching element Q3, and fourth switching element Q4). The semiconductor switching elements Q are MOSFETs (Metal Oxide Semiconductor Field Effect Transistors) made of silicon (Si) semiconductor. A diode RD is connected to the semiconductor switching elements Q in anti-parallel configuration. The diode RD functions as a so-called freewheeling diode.

[0056] Four semiconductor switching elements Q are connected in series. Additionally, the four semiconductor switching elements Q are connected between the positive potential point P and the negative potential point N. Specifically, the drain D1 of the first switching element Q1 is electrically connected to the positive potential point P. The source S1 of the first switching element Q1 is electrically connected to the drain D2 of the second switching element Q2 via connection point 81. The source S2 of the second switching element Q2 is electrically connected to the drain D1 of the third switching element Q3 via connection point 82. The source S1 of the third switching element Q3 is electrically connected to the drain D2 of the fourth switching element Q4 via connection point 83. The source S2 of the fourth switching element Q4 is electrically connected to the negative potential point N. Furthermore, the source S2 of the second switching element Q2 and the drain D1 of the third switching element Q3 are connected to the AC (output) potential point AC via connection point 82. out Electrical connection.

[0057] In addition, the power conversion unit 110 includes two diodes CD (a first diode CD1 and a second diode CD2). The diodes CD are, for example, diodes made of silicon semiconductor.

[0058] Two diodes CD are connected in series. Additionally, diode CD functions as a so-called clamping diode. Specifically, the cathode K of the first diode CD1 is electrically connected via connection point 81 to the source S1 of the first switching element Q1 and the drain D2 of the second switching element Q2. The anode A of the first diode CD1 is electrically connected via connection point 84 to the cathode K of the second diode CD2. The anode A of the second diode CD2 is electrically connected via connection point 83 to the source S1 of the third switching element Q3 and the drain D2 of the fourth switching element Q4. Furthermore, the anode A of the first diode CD1 and the cathode K of the second diode CD2 are electrically connected via connection point 84 to the intermediate potential point M.

[0059] like Figure 3 As shown, the power conversion unit 110 includes two switching assemblies 20 (first switching assembly 21 and second switching assembly 22) and two diode assemblies 30 (first diode assembly 31 and second diode assembly 32). Each switching assembly 20 includes two semiconductor switching elements Q and has a positive terminal 20a, a negative terminal 20b, and an output terminal 20c. The switching assembly 20 is a so-called two-element type assembly (2-in-1 assembly). Each diode assembly 30 includes a diode CD and has an anode terminal 30a and a cathode terminal 30b. The diode assembly 30 is a so-called one-element type assembly (1-in-1 assembly). Furthermore, the first switching assembly 21 and the second switching assembly 22 are constructed with substantially the same package. Similarly, the first diode assembly 31 and the second diode assembly 32 are constructed with substantially the same package.

[0060] Specifically, the first switching assembly 21 integrates a first switching element Q1 and a second switching element Q2. The first switching assembly 21 has a positive terminal 21a, a negative terminal 21b, and an output terminal 21c as external connection terminals. The positive terminal 21a of the first switching assembly 21 is located at the positive potential point P of the drain D1 of the first switching element Q1. That is, the positive terminal 21a of the first switching assembly 21 is the upper potential terminal. The negative terminal 21b of the first switching assembly 21 is located at the connection point 82 of the source S2 of the second switching element Q2. The output terminal 21c of the first switching assembly 21 is located at the first diode assembly 31 at connection point 81.

[0061] The second switching assembly 22 incorporates the third switching element Q3 and the fourth switching element Q4. The second switching assembly 22 has a positive terminal 22a, a negative terminal 22b, and an output terminal 22c as external connection terminals. The positive terminal 22a of the second switching assembly 22 is located at the connection point 82 of the drain D1 of the third switching element Q3. The negative terminal 22b of the second switching assembly 22 is located at the negative potential point N of the source S2 of the fourth switching element Q4. That is, the negative terminal 22b of the second switching assembly 22 is a lower potential terminal. The output terminal 22c of the second switching assembly 22 is located at the connection point 83 of the second diode assembly 32.

[0062] The first diode assembly 31 houses the first diode CD1. The first diode assembly 31 has an anode terminal 31a and a cathode terminal 31b as external connection terminals. The anode terminal 31a of the first diode assembly 31 is located at the connection point 84 of the anode A of the first diode CD1. That is, the anode terminal 31a of the first diode assembly 31 is an intermediate potential terminal. The cathode terminal 31b of the first diode assembly 31 is located on the side of the first switching assembly 21 at the cathode K of the first diode CD1. That is, the cathode terminal 31b of the first diode assembly 31 is connected to the output terminal 21c of the first switching assembly 21.

[0063] The second diode assembly 32 houses the second diode CD2. The second diode assembly 32 has an anode terminal 32a and a cathode terminal 32b as external connection terminals. The anode terminal 32a of the second diode assembly 32 is located on the side of the second switching assembly 22 at the anode A of the second diode CD2. That is, the anode terminal 32a of the second diode assembly 32 is connected to the output terminal 22c of the second switching assembly 22. The cathode terminal 32b of the second diode assembly 32 is located on the side of the connection point 84 of the cathode K of the second diode CD2. That is, the cathode terminal 32b of the second diode assembly 32 is an intermediate potential terminal.

[0064] like Figure 4 As shown, the switch assembly 20 has a generally rectangular parallelepiped shape. The positive terminal 20a, negative terminal 20b, and output terminal 20c of the switch assembly 20 are located on the upper side (Z1 side) of the generally rectangular parallelepiped switch assembly 20. In the switch assembly 20, two positive terminals 20a and two negative terminals 20b are each arranged in a Y-direction arrangement. Additionally, three output terminals 20c are arranged in a Y-direction arrangement. In the switch assembly 20, the positive terminal 20a, negative terminal 20b, and output terminal 20c are arranged in the X-direction in the order of positive terminal 20a, negative terminal 20b, and output terminal 20c.

[0065] In the switching assembly 20, the positive terminal 20a and the negative terminal 20b are disposed at one end 20d in the X direction. Additionally, in the switching assembly 20, the output terminal 20c is disposed at the other end 20e in the X direction. That is, in the first embodiment, at least two of the positive terminal 20a, the negative terminal 20b, and the output terminal 20c of the first switching assembly 21 are respectively disposed at one end 20d in the X direction and the other end 20e, and at least two of the positive terminal 20a, the negative terminal 20b, and the output terminal 20c of the second switching assembly 22 are respectively disposed at one end 20d in the X direction and the other end 20e. In the switching assembly 20, a control substrate 20g for controlling the switching operation of the semiconductor switching element Q is disposed in the space between the negative terminal 20b and the output terminal 20c (central portion 20f in the X direction). Figure 6 ).exist Figure 4 The diagram of the control board 20g is omitted.

[0066] like Figure 5 As shown, the diode assembly 30 has a generally cuboid shape. The anode terminal 30a and cathode terminal 30b of the diode assembly 30 are located on the upper side (Z1 side) of the generally cuboid-shaped diode assembly 30. In the diode assembly 30, two anode terminals 30a and two cathode terminals 30b are each arranged along the Y direction. In the diode assembly 30, the anode terminals 30a and the cathode terminals 30b are arranged along the X direction.

[0067] In the diode assembly 30, the anode terminal 30a and the cathode terminal 30b are disposed in the central portion 30c in the X direction. That is, in the first embodiment, the anode terminal 30a and the cathode terminal 30b of the first diode assembly 31 and the anode terminal 30a and the cathode terminal 30b of the second diode assembly 32 are respectively disposed in the central portion 30c in the X direction. Furthermore, in the diode assembly 30, external connection terminals (anode terminal 30a and cathode terminal 30b) of the assembly are not disposed at the end 30d on one side in the X direction and the end 30e on the other side in the X direction.

[0068] like Figure 6 As shown, in the first embodiment, the first switch assembly 21, the second switch assembly 22, the first diode assembly 31, and the second diode assembly 32 are arranged in a manner along the X direction. More specifically, the first diode assembly 31, the first switch assembly 21, the second switch assembly 22, and the second diode assembly 32 are arranged in a manner along the X direction from the X1 side towards the X2 side in the order of first diode assembly 31, first switch assembly 21, second switch assembly 22, and second diode assembly 32.

[0069] Furthermore, in the first embodiment, multiple (two) first switch assemblies 21 and 22 are connected in parallel in a manner arranged along the Y direction. Specifically, two first switch assemblies 21 and 22 are provided in a manner arranged along the Y direction. Moreover, the positive terminals 21a of the two first switch assemblies 21 are electrically connected to each other, the negative terminals 21b are connected to each other, and the output terminal 21c is connected to each other. Figure 6 This is not illustrated in the diagram. Furthermore, the positive terminals 22a of the two second switching assemblies 22 are electrically connected to each other, the negative terminals 22b are connected to each other, and the output terminal 22c is connected to each other. Additionally, the diode assembly 30, being a one-element type assembly (1-in-1 assembly), is a large-capacity package with a larger capacity than the switching assembly 20, being a two-element type assembly (2-in-1 assembly); therefore, each of the first diode assembly 31 and the second diode assembly 32 is provided (not connected in parallel).

[0070] Furthermore, the two first switching components 21 and the two second switching components 22 are arranged at approximately the same position in the Y direction. Additionally, the two first switching components 21 and the two second switching components 22 are configured such that the center line 92 in the Y direction between the two first switching components 21 and the two second switching components 22 passes through the center in the Y direction of the first diode assembly 31 and the center in the Y direction of the second diode assembly 32. That is, the first diode assembly 31, the group of two first switching components 21, the group of two second switching components 22, and the second diode assembly 32 are each arranged in a substantially symmetrical manner with respect to the center line 92 in the Y direction.

[0071] Furthermore, in the first embodiment, the distance L1 in the X direction between the output terminal 21c of the first switching assembly 21 and the cathode terminal 31b of the first diode assembly 31, and the distance L2 in the X direction between the output terminal 22c of the second switching assembly 22 and the anode terminal 32a of the second diode assembly 32 are approximately equal.

[0072] Specifically, the positive terminal 21a, negative terminal 21b, and output terminal 21c of the first switching assembly 21 are arranged in a manner substantially symmetrical with respect to the positive terminal 22a, negative terminal 22b, and output terminal 22c of the second switching assembly 22, with respect to the center line 91 along the Y direction. That is, the first switching assembly 21 and the second switching assembly 22 are arranged in a manner substantially symmetrical with respect to the center line 91. Furthermore, the cathode terminal 31b and anode terminal 31a of the first diode assembly 31 are arranged in a manner substantially symmetrical with respect to the anode terminal 32a and cathode terminal 32b of the second diode assembly 32, with respect to the center line 91. That is, the first diode assembly 31 and the second diode assembly 32 are arranged in a manner substantially symmetrical with respect to the center line 91.

[0073] Specifically, the positive terminal 21a, negative terminal 21b, and output terminal 21c of the first switch assembly 21 are arranged in the X direction from the X2 side toward the X1 side in the order of positive terminal 21a, negative terminal 21b, and output terminal 21c. That is, in the first switch assembly 21, the positive terminal 21a and negative terminal 21b are located at the end 21d on the X2 side, and the output terminal 21c is located at the end 21e on the X1 side. The positive terminal 22a, negative terminal 22b, and output terminal 22c of the second switch assembly 22 are arranged in the X direction from the X1 side toward the X2 side in the order of positive terminal 22a, negative terminal 22b, and output terminal 22c. That is, in the second switch assembly 22, the positive terminal 22a and negative terminal 22b are located at the end 22d on the X1 side, and the output terminal 22c is located at the end 22e on the X2 side. Furthermore, the cathode terminal 31b and anode terminal 31a of the first diode assembly 31 are arranged in the X direction from the X2 side toward the X1 side in the order of cathode terminal 31b and anode terminal 31a. The anode terminal 32a and cathode terminal 32b of the second diode assembly 32 are arranged in the X direction from the X1 side toward the X2 side in the order of anode terminal 32a and cathode terminal 32b.

[0074] Furthermore, in the first embodiment, the first switch assembly 21 and the second switch assembly 22 are configured to be separated in the X direction such that the shortest distance L11 between the terminals of the first switch assembly 21 and the terminals of the second switch assembly 22 is at least a predetermined insulation distance (determined by the power conversion device 100). Specifically, the shortest distance L11 between the terminals of the first switch assembly 21 and the terminals of the second switch assembly 22 is equivalent to the distance between the end of the positive terminal 21a of the first switch assembly 21 on the second switch assembly 22 side (X2 side) and the end of the positive terminal 22a of the second switch assembly 22 on the first switch assembly 21 side (X1 side). Since the potentials of the positive terminals 21a of the first switch assembly 21 and the positive terminals 22a of the second switch assembly 22 are different, the first switch assembly 21 and the second switch assembly 22 are configured to be separated in the X direction such that the shortest distance L11 is at least a predetermined insulation distance (determined by the power conversion device 100).

[0075] like Figure 7As shown, the power conversion unit 110 includes a first capacitor C1 and a second capacitor C2. The first capacitor C1 and the second capacitor C2 have a generally cuboid shape. The first capacitor C1 and the second capacitor C2 are arranged in an X-direction arrangement. The first capacitor C1 is located on the X1 side, and the second capacitor C2 is located on the X2 side. The first capacitor C1 and the second capacitor C2 are positioned above the first diode assembly 31, the first switch assembly 21, the second switch assembly 22, and the second diode assembly 32 (Z1 side). As will be described later, the first capacitor C1 and the second capacitor C2 are connected in series.

[0076] like Figure 8 As shown, the power conversion unit 110 includes a cooling unit 18. The cooling unit 18 is located at the lower part (Z2 side) of the power conversion unit 110. The cooling unit 18 includes a heat sink (not shown) that protrudes downward (Z2 side) and extends in the X direction. Multiple heat sinks are provided, separated from each other in the Y direction. Furthermore, the first diode assembly 31, the first switch assembly 21, the second switch assembly 22, and the second diode assembly 32 are arranged in the X direction on the upper side (Z1 side) of the cooling unit 18, on the mounting surface 18a.

[0077] In addition, such as Figure 7 As shown, the power conversion unit 110 includes a positive potential conductor 41, a negative potential conductor 42, an intermediate potential conductor 50, an AC potential conductor 60, a positive side connection conductor 71, and a negative side connection conductor 72. The positive potential conductor 41, the negative potential conductor 42, the intermediate potential conductor 50, the AC potential conductor 60, the positive side connection conductor 71, and the negative side connection conductor 72 are all conductors (busbars) formed in a plate shape.

[0078] like Figure 9 As shown, the positive potential conductor 41 includes a vertical wall portion 41a extending in the Z direction and a leg portion 41b extending in the X direction. The leg portion 41b is configured to extend in the X2 direction from the lower end (Z2 side) of the vertical wall portion 41a. The positive potential conductor 41 has a generally L-shaped form due to the vertical wall portion 41a and the leg portion 41b. Figure 8 As shown, the vertical wall portion 41a of the positive potential conductor 41 is disposed on the X2 side of the first capacitor C1.

[0079] The positive potential conductor 41 is connected to the positive terminal C1p of the first capacitor C1 and the positive terminal 21a of the first switching assembly 21. Specifically, the positive potential conductor 41 is connected at the vertical wall portion 41a to the positive terminal C1p located on the X2 side of the first capacitor C1. In addition, the positive potential conductor 41 is connected at the leg portion 41b to the positive terminal 21a located on the upper side (Z1 side) of the first switching assembly 21.

[0080] like Figure 10 As shown, the negative potential conductor 42 includes a vertical wall portion 42a extending in the Z direction and a leg portion 42b extending in the X direction. The leg portion 42b is configured to extend in the X2 direction from the lower end (Z2 side) of the vertical wall portion 42a. The negative potential conductor 42 has a generally L-shaped form due to the vertical wall portion 42a and the leg portion 42b. Figure 8 As shown, the vertical wall portion 42a of the negative potential conductor 42 is disposed on the X1 side of the second capacitor C2. Furthermore, the leg portion 42b of the negative potential conductor 42 is configured such that its position (height position) in the Z direction is approximately equal to the position (height position) of the leg portion 41b of the positive potential conductor 41 in the Z direction (disposed on the same plane).

[0081] The negative potential conductor 42 is connected to the negative terminal C2n of the second capacitor C2 and the negative terminal 22b of the second switch assembly 22. Specifically, the negative potential conductor 42 is connected at the vertical wall portion 42a to the negative terminal C2n located on the X1 side of the second capacitor C2. In addition, the negative potential conductor 42 is connected at the leg portion 42b to the negative terminal 22b located on the upper side (Z1 side) of the second switch assembly 22.

[0082] like Figure 11 As shown, the intermediate potential conductor 50 includes a first vertical wall portion 51 extending in the Z direction. The first vertical wall portion 51 is composed of a first portion 51a extending in the Z direction and a second portion 51b extending in the X direction. The second portion 51b is configured to extend in the X1 direction from the lower end (Z2 side) of the first portion 51a. The first vertical wall portion 51 has a generally L-shaped form due to the first portion 51a and the second portion 51b. Figure 8 As shown, in the first embodiment, the first vertical wall portion 51 is configured to be adjacent to the vertical wall portion 41a of the positive potential conductor 41. Specifically, the first portion 51a of the first vertical wall portion 51 is disposed near the X1 side of the vertical wall portion 41a of the positive potential conductor 41, opposite to the vertical wall portion 41a of the positive potential conductor 41 in the X direction. That is, the first portion 51a of the first vertical wall portion 51 and the vertical wall portion 41a of the positive potential conductor 41 are stacked together with an insulating member (not shown) in between.

[0083] like Figure 12 As shown, the intermediate potential conductor 50 includes a second vertical wall portion 52 extending in the Z direction. The second vertical wall portion 52 is composed of a first portion 52a extending in the Z direction and a second portion 52b extending in the X direction. The second portion 52b extends in the X1 direction from the lower end (Z2 side) of the first portion 52a. The second vertical wall portion 52 has a generally L-shaped form due to the first portion 52a and the second portion 52b. Figure 8As shown, in the first embodiment, the second vertical wall portion 52 is configured to be adjacent to the vertical wall portion 42a of the negative potential conductor 42. Specifically, the first portion 52a of the second vertical wall portion 52 is disposed near the X1 side of the vertical wall portion 42a of the negative potential conductor 42, opposite to the vertical wall portion 42a of the negative potential conductor 42 in the X direction. That is, the first portion 52a of the second vertical wall portion 52 and the vertical wall portion 42a of the negative potential conductor 42 are stacked together with an insulating member (not shown) in between.

[0084] like Figure 13 As shown, the intermediate potential conductor 50 includes legs 53 configured to extend along the X direction. Figure 7 As shown, the leg 53 is fixed in a state where it contacts the second portion 51b of the first vertical wall portion 51 in the Z direction. Additionally, the leg 53 is fixed in a state where it contacts the second portion 52b of the second vertical wall portion 52 in the Z direction. In the first embodiment, the leg 53 is configured such that it is adjacent to the leg 41b of the positive potential conductor 41 and the leg 42b of the negative potential conductor 42 in the Z direction. Specifically, the leg 53 of the intermediate potential conductor 50 is disposed near the lower side (Z2 side) of the leg 41b of the positive potential conductor 41, opposite to the leg 41b of the positive potential conductor 41 in the Z direction. Furthermore, the leg 53 of the intermediate potential conductor 50 is disposed near the lower side (Z2 side) of the leg 42b of the negative potential conductor 42, opposite to the leg 42b of the negative potential conductor 42 in the Z direction.

[0085] like Figure 8 As shown, the intermediate potential conductor 50 is connected to the negative terminal C1n of the first capacitor C1, the positive terminal C2p of the second capacitor C2, the anode terminal 31a of the first diode assembly 31, and the cathode terminal 32b of the second diode assembly 32. Specifically, the intermediate potential conductor 50 is located in the first portion 51a of the first vertical wall portion 51 (see reference). Figure 11 The intermediate potential conductor 50 is connected to the negative terminal C1n located on the X2 side of the first capacitor C1. Additionally, the intermediate potential conductor 50 is located in the first part 52a of the second vertical wall portion 52 (see reference). Figure 12 The intermediate potential conductor 50 is connected to the positive terminal C2p on the X1 side of the second capacitor C2. Additionally, the intermediate potential conductor 50 is connected at its leg 53 to the anode terminal 31a on the upper side (Z1 side) of the first diode assembly 31. Furthermore, the intermediate potential conductor 50 is connected at its leg 53 to the cathode terminal 32b on the upper side (Z1 side) of the second diode assembly 32.

[0086] like Figure 14 As shown, the alternating current potential conductor 60 is configured to extend along the X direction. (As indicated...) Figure 8As shown, the AC potential conductor 60 is disposed on the lower side (Z2 side) of the leg 53 of the intermediate potential conductor 50. In addition, the AC potential conductor 60 is disposed on the upper side (Z1 side) of the first diode assembly 31, the first switch assembly 21 and the second switch assembly 22.

[0087] An AC potential conductor 60 is connected to the negative terminal 21b of the first switching assembly 21 and the positive terminal 22a of the second switching assembly 22. Specifically, the AC potential conductor 60 is connected to the negative terminal 21b located on the upper side (Z1 side) of the first switching assembly 21. Additionally, the AC potential conductor 60 is connected to the positive terminal 22a located on the upper side (Z1 side) of the second switching assembly 22.

[0088] In the first embodiment, the AC potential conductor 60 includes a bend 60a that is bent in a manner separate from the region R of the control substrate 20g on which the first switch assembly 21 is disposed. Specifically, the AC potential conductor 60 includes a first portion 61 extending in the X direction, a second portion 62 extending downward in the Z2 direction from the X2 side end of the first portion 61, and a third portion 63 extending in the X2 direction from the lower side (Z2 side) end of the second portion 62. The second portion 62 is disposed near the X2 side of the region R on which the control substrate 20g is disposed. Furthermore, the first portion 61, extending in the X1 direction from the Z1 side end of the second portion 62, is disposed on the Z1 side of the region R on which the control substrate 20g is disposed, in a manner separate from the region R. That is, the bend 60a is formed at the X2 side end of the first portion 61, the X1 side ends of the second portion 62 and the third portion 63.

[0089] like Figure 15 As shown, the positive side connecting conductor 71 is configured to extend along the X direction. Figure 8 As shown, the positive-side connecting conductor 71 is disposed below the AC potential conductor 60 (Z2 side). In addition, the positive-side connecting conductor 71 is disposed above both the first diode assembly 31 and the first switch assembly 21 (Z1 side).

[0090] The positive-side connecting conductor 71 is connected to the output terminal 21c of the first switching assembly 21 and the cathode terminal 31b of the first diode assembly 31. Specifically, the end of the positive-side connecting conductor 71 on the X2 side is connected to the output terminal 21c located on the upper side (Z1 side) of the first switching assembly 21. Additionally, the end of the positive-side connecting conductor 71 on the X1 side is connected to the cathode terminal 31b located on the upper side (Z1 side) of the first diode assembly 31.

[0091] like Figure 16 As shown, the negative-side connecting conductor 72 is configured to extend along the X direction. Figure 8As shown, the negative-side connecting conductor 72 is disposed on the lower side (Z2 side) of the leg 53 of the intermediate potential conductor 50. In addition, the negative-side connecting conductor 72 is disposed on the upper side (Z1 side) of both the second switch assembly 22 and the second diode assembly 32.

[0092] The negative-side connecting conductor 72 is connected to the output terminal 22c of the second switching assembly 22 and the anode terminal 32a of the second diode assembly 32. Specifically, the end of the negative-side connecting conductor 72 on the X1 side is connected to the output terminal 22c located on the upper side (Z1 side) of the second switching assembly 22. Additionally, the end of the negative-side connecting conductor 72 on the X2 side is connected to the anode terminal 32a located on the upper side (Z1 side) of the second diode assembly 32.

[0093] Furthermore, in the power conversion unit 110, the terminals of the first diode assembly 31 (anode terminal 31a and cathode terminal 31b), the terminals of the first switch assembly 21 (positive terminal 21a, negative terminal 21b and output terminal 21c), the terminals of the second switch assembly 22 (positive terminal 22a, negative terminal 22b and output terminal 22c), and the terminals of the second diode assembly 32 (anode terminal 32a and cathode terminal 32b) are configured such that their positions (height positions) in the Z direction are approximately equal (arranged on the same plane). Additionally, in the power conversion unit 110, the positive connecting conductor 71, the negative connecting conductor 72, and the third portion 63 of the AC potential conductor 60 are configured such that their positions (height positions) in the Z direction are approximately equal (arranged on the same plane). That is, the legs 41b of the positive potential conductor 41 and the legs 42b of the negative potential conductor 42, the leg 53 of the intermediate potential conductor 50, and the third part 63 of the positive side connecting conductor 71, the negative side connecting conductor 72, and the AC potential conductor 60 (all arranged on the same plane) are stacked in the above order, separated by an insulating member (not shown). Furthermore, the positive side connecting conductor 71 is connected to the output terminal 21c of the first switch assembly 21 at its X2 side end, and to the cathode terminal 31b of the first diode assembly 31 at its X1 side end. Similarly, the negative side connecting conductor 72 is connected to the output terminal 22c of the second switch assembly 22 at its X1 side end, and to the anode terminal 32a of the second diode assembly 32 at its X2 side end. Furthermore, as described above, in the power conversion unit 110, the distance L1 in the X direction between the output terminal 21c of the first switching assembly 21 and the cathode terminal 31b of the first diode assembly 31, and the distance L2 in the X direction between the output terminal 22c of the second switching assembly 22 and the anode terminal 32a of the second diode assembly 32 are approximately equal. As a result, as... Figure 17As shown, in the power conversion unit 110, the length of the wiring connecting the output terminal 21c of the first switch assembly 21 to the cathode terminal 31b of the first diode assembly 31 is approximately equal to the length of the wiring connecting the output terminal 22c of the second switch assembly 22 to the anode terminal 32a of the second diode assembly 32.

[0094] Furthermore, in the power conversion unit 110, the cathode terminal 31b of the first diode assembly 31 is positioned X2 closer to the anode terminal 31a, and the output terminal 21c of the first switch assembly 21 is positioned X1 closer to the positive terminal 21a and the negative terminal 21b. Therefore, in the power conversion unit 110, the length of the wiring connecting the output terminal 21c of the first switch assembly 21 and the cathode terminal 31b of the first diode assembly 31 becomes shorter. Similarly, in the power conversion unit 110, the output terminal 22c of the second switch assembly 22 is positioned X2 closer to the positive terminal 22a and the negative terminal 22b, and the anode terminal 32a of the second diode assembly 32 is positioned X1 closer to the cathode terminal 32b. Therefore, in the power conversion unit 110, the length of the wiring connecting the output terminal 22c of the second switch assembly 22 and the anode terminal 32a of the second diode assembly 32 becomes shorter.

[0095] (Effects of the first embodiment)

[0096] In the first embodiment, the following effects can be obtained.

[0097] In the first embodiment, as described above, the power conversion device 100 is configured such that the distance L1 in the X direction between the output terminal 21c of the first switching assembly 21 and the cathode terminal 31b of the first diode assembly 31, and the distance L2 in the X direction between the output terminal 22c of the second switching assembly 22 and the anode terminal 32a of the second diode assembly 32 are approximately equal. Therefore, when the first switching assembly 21, the second switching assembly 22, the first diode assembly 31, and the second diode assembly 32 are arranged in an X-direction arrangement, it is easy to make the length of the wiring connecting the output terminal 21c of the first switching assembly 21 and the cathode terminal 31b of the first diode assembly 31, and the length of the wiring connecting the output terminal 22c of the second switching assembly 22 and the anode terminal 32a of the second diode assembly 32, approximately equal. Furthermore, the power conversion device 100 is configured such that the first diode assembly 31 and the second diode assembly 32 are provided separately. Therefore, unlike the case where the diode CD (first diode CD1) connected to the output terminal 21c of the first switching component 21 and the diode CD (second diode CD2) connected to the output terminal 22c of the second switching component 22 are integrated into one component, the terminal connected to the output terminal 21c of the first switching component 21 (cathode terminal 31b of the first diode component 31) and the terminal connected to the output terminal 22c of the second switching component 22 (anode terminal 32a of the second diode component 32) can be configured separately. Thus, regardless of the configuration positions of the first switching component 21 and the second switching component 22, it is possible to easily (i.e., while suppressing a decrease in the degree of freedom in component configuration) make the distance L1 in the X direction between the output terminal 21c of the first switching component 21 and the cathode terminal 31b of the first diode component 31, and the distance L2 in the X direction between the output terminal 22c of the second switching component 22 and the anode terminal 32a of the second diode component 32 approximately equal. As a result, in a three-level circuit, while reducing the degree of freedom in the configuration of the suppression components, the circuit inductance present in the commutation circuit of the semiconductor switching element Q can be made approximately equal between the upper and lower potential sides (the circuit inductance present in the commutation path when the first switching element Q1 and the fourth switching element Q4 are turned off can be made approximately equal, and the circuit inductance present in the commutation path when the second switching element Q2 and the third switching element Q3 are turned off can be made approximately equal).That is, in a three-level circuit, while reducing the degree of freedom in the configuration of the suppression components, the surge voltage burden applied to the symmetrical semiconductor switching elements Q on the circuit can be made approximately equal between the upper and lower potential sides (the surge voltage burden applied to the first switching element Q1 and the surge voltage burden applied to the fourth switching element Q4 can be made approximately equal, and the surge voltage burden applied to the second switching element Q2 and the surge voltage burden applied to the third switching element Q3 can be made approximately equal).

[0098] Furthermore, in the first embodiment, as described above, the output terminal 21c of the first switching assembly 21 and the output terminal 22c of the second switching assembly 22 are arranged in a manner substantially symmetrical with respect to the center line 91 along the Y direction orthogonal to the X direction. Additionally, the cathode terminal 31b of the first diode assembly 31 and the anode terminal 32a of the second diode assembly 32 are arranged in a manner substantially symmetrical with respect to the center line 91. Therefore, in the X direction, the distance L3 (refer to...) from the center line 91 to one side (X1 side) of the output terminal 21c of the first switching assembly 21 can be... Figure 6 The distance L4 between the output terminal 22c of the second switch assembly 22 from the center line 91 to the other side (X2 side) (refer to) Figure 6 The distances L5 from the center line 91 to the cathode terminal 31b of the first diode assembly 31 on one side (X1 side) are approximately equal. Figure 6 The distance L6 from the center line 91 to the anode terminal 32a of the second diode assembly 32 on the other side (X2 side) (refer to) Figure 6 The distances L1 in the X direction between the output terminal 21c of the first switching assembly 21 and the cathode terminal 31b of the first diode assembly 31, and L2 in the X direction between the output terminal 22c of the second switching assembly 22 and the anode terminal 32a of the second diode assembly 32, are approximately equal. As a result, it is easy to achieve a structure in which the distance L1 in the X direction between the output terminal 21c of the first switching assembly 21 and the cathode terminal 31b of the first diode assembly 31, and L2 in the X direction between the output terminal 22c of the second switching assembly 22 and the anode terminal 32a of the second diode assembly 32 are approximately equal.

[0099] Furthermore, in the first embodiment, as described above, the positive terminal 21a, negative terminal 21b, and output terminal 21c of the first switching assembly 21 are configured to be approximately symmetrical with respect to the center line 91, as are the positive terminal 22a, negative terminal 22b, and output terminal 22c of the second switching assembly 22. Similarly, the cathode terminal 31b and anode terminal 31a of the first diode assembly 31 are configured to be approximately symmetrical with respect to the center line 91, as are the anode terminal 32a and cathode terminal 32b of the second diode assembly 32. Therefore, by using a switching assembly 20 in the first switching assembly 21 and the second switching assembly 22 with approximately the same configuration of positive terminal 20a, negative terminal 20b, and output terminal 20c, it is easy to achieve a structure in which the output terminals 21c of the first switching assembly 21 and the output terminals 22c of the second switching assembly 22 are configured in a manner approximately symmetrical with respect to the center line 91. Furthermore, by using diode assemblies 30 in the first diode assembly 31 and the second diode assembly 32 with substantially the same configuration of anode terminal 30a and cathode terminal 30b, it is easy to realize a structure in which the cathode terminal 31b of the first diode assembly 31 and the anode terminal 32a of the second diode assembly 32 are configured in a substantially symmetrical manner with respect to the center line 91.

[0100] Furthermore, in the first embodiment, as described above, the first switch assembly 21 and the second switch assembly 22 are constructed with substantially identical packages, and the first switch assembly 21 and the second switch assembly 22 are configured to be substantially symmetrical with respect to the center line 91. Similarly, the first diode assembly 31 and the second diode assembly 32 are constructed with substantially identical packages, and the first diode assembly 31 and the second diode assembly 32 are configured to be substantially symmetrical with respect to the center line 91. Therefore, the arrangement of the output terminals 20c in the switch assembly 20 is substantially the same in the first switch assembly 21 and the second switch assembly 22, thus it is easy to realize a structure in which the output terminals 21c of the first switch assembly 21 and the output terminals 22c of the second switch assembly 22 are configured in a substantially symmetrical manner with respect to the center line 91. Furthermore, the configuration of the anode terminal 30a and cathode terminal 30b in the diode assembly 30 is substantially the same in the first diode assembly 31 and the second diode assembly 32. Therefore, it is easy to realize a structure in which the cathode terminal 31b of the first diode assembly 31 and the anode terminal 32a of the second diode assembly 32 are configured in a substantially symmetrical manner with respect to the center line 91.

[0101] Furthermore, in the first embodiment, as described above, the first switching assembly 21 is configured such that at least two of the positive terminal 21a, negative terminal 21b, and output terminal 21c are respectively disposed at an end 21e on one side (X1 side) and an end 21d on the other side (X2 side) in the X direction. Similarly, the second switching assembly 22 is configured such that at least two of the positive terminal 22a, negative terminal 22b, and output terminal 22c are respectively disposed at an end 22d on one side (X1 side) and an end 22e on the other side (X2 side) in the X direction. Additionally, the first diode assembly 31 and the second diode assembly 32 are configured such that their respective anode terminal 30a and cathode terminal 30b are disposed at the central portion 30c in the X direction. Therefore, the anode terminal 30a and cathode terminal 30b of the first diode assembly 31 and the anode terminal 30a and cathode terminal 30b of the second diode assembly 32 are respectively disposed in the central portion 30c in the X direction. Thus, it is possible to separate the anode terminal 30a from the end in the X direction and to separate the cathode terminal 30b from the end in the X direction. As a result, when other components are disposed adjacent to the first diode assembly 31 or the second diode assembly 32 in the X direction, it is possible to suppress the increase of the separation distance of the components used to ensure the insulation distance between the terminals in the X direction.

[0102] Furthermore, in the first embodiment, as described above, the first diode assembly 31, the first switch assembly 21, the second switch assembly 22, and the second diode assembly 32 are arranged in the X-direction in the order of first diode assembly 31, first switch assembly 21, second switch assembly 22, and second diode assembly 32. Moreover, the first switch assembly 21 and the second switch assembly 22 are arranged such that the shortest distance L11 between the terminals of the first switch assembly 21 and the second switch assembly 22 is at least a predetermined insulation distance (determined by the power conversion device 100) separated in the X-direction. This effectively ensures the dielectric strength between the terminals of the first switch assembly 21 on the second switch assembly 22 side and the terminals of the second switch assembly 22 on the first switch assembly 21 side.

[0103] In the first embodiment, as described above, the power conversion device 100 is configured to include a first capacitor C1 and a second capacitor C2 connected in series, a positive potential conductor 41, a negative potential conductor 42, and an intermediate potential conductor 50. The positive potential conductor 41 is connected to the positive terminal C1p of the first capacitor C1 and the positive terminal 21a of the first switching assembly 21. The negative potential conductor 42 is connected to the negative terminal C2n of the second capacitor C2 and the negative terminal 22b of the second switching assembly 22. The intermediate potential conductor 50 is connected to the negative terminal C1n of the first capacitor C1, the positive terminal C2p of the second capacitor C2, the anode terminal 31a of the first diode assembly 31, and the cathode terminal 32b of the second diode assembly 32. Furthermore, the positive potential conductor 41 and the negative potential conductor 42 are each configured to include vertical wall portions (vertical wall portions 41a and 42a), which extend along the Z direction orthogonal to the X and Y directions. Additionally, the intermediate potential conductor 50 is configured to include a first vertical wall portion 51 and a second vertical wall portion 52, which extend along the Z direction adjacent to the respective vertical wall portions (vertical wall portions 41a and 42a) of the positive and negative potential conductors 41 and 42. Thus, the vertical wall portion 41a of the positive potential conductor 41 and the first vertical wall portion 51 of the intermediate potential conductor 50, which carry currents in opposite directions, are configured adjacent to each other (stacked), thereby reducing the inductance of the vertical wall portion 41a of the positive potential conductor 41 and the inductance of the first vertical wall portion 51 of the intermediate potential conductor 50. Furthermore, since the vertical wall portion 42a of the negative potential conductor 42 and the second vertical wall portion 52 of the intermediate potential conductor 50, which carry currents in opposite directions, are configured adjacent to each other, the inductance of the vertical wall portion 42a of the negative potential conductor 42 and the inductance of the second vertical wall portion 52 of the intermediate potential conductor 50 can be reduced. In the first embodiment, as described above, the positive side connecting conductor 71, the negative side connecting conductor 72, and the third portion 63 of the AC potential conductor 60 are configured adjacent to (stacked) the leg portion 53 of the intermediate potential conductor 50. This reduces the circuit inductance present in the commutation path when the first switching element Q1, the second switching element Q2, the third switching element Q3, and the fourth switching element Q4 are each turned off.

[0104] Furthermore, in the first embodiment, as described above, the positive potential conductor 41 and the negative potential conductor 42 are each configured to include legs (legs 41b and 42b), which are configured to extend in the X direction. Additionally, the intermediate potential conductor 50 is configured to include a leg 53, which is configured to extend in the X direction adjacent to the legs (legs 41b and 42b) of the positive potential conductor 41 and the negative potential conductor 42 in the Z direction. Therefore, by utilizing the legs 41b of the positive potential conductor 41, the legs 42b of the negative potential conductor 42, and the legs 53 of the intermediate potential conductor 50, which are arranged in the X direction, the terminals of the first switch assembly 21 and the second switch assembly 22, which are arranged in the X direction with positive side terminal 20a, negative side terminal 20b, and output terminal 20c, can be easily connected to the terminals of the first diode assembly 31 and the second diode assembly 32, which are arranged in the X direction with anode terminal 30a and cathode terminal 30b.

[0105] Furthermore, in the first embodiment, as described above, the power conversion device 100 is configured to include an AC potential conductor 60, which is configured to connect the negative terminal 21b of the first switching assembly 21 and the positive terminal 22a of the second switching assembly 22 and extend in the X direction. The AC potential conductor 60 is also configured to include a bend 60a, which is bent in a manner separate from the region R where the control board 20g of the first switching assembly 21 is disposed. Therefore, even when the AC potential conductor 60 is disposed near the first switching assembly 21 or near the second switching assembly 22 in an X-direction manner, the bend 60a of the AC potential conductor 60 easily ensures the space for disposing the control board 20g between the AC potential conductor 60 and the first switching assembly 21.

[0106] Furthermore, in the first embodiment, as described above, the first switch assembly 21 and the second switch assembly 22 are each configured to have multiple units connected in parallel in a manner arranged along the Y direction. Therefore, the direction (Y direction) in which the switch assemblies 20 are connected in parallel is orthogonal to the direction (X direction) in which the positive terminals 20a, negative terminals 20b, and output terminals 20c of the switch assemblies are arranged, and the anode terminals 30a and cathode terminals 30b of the diode assembly 30 are arranged. Thus, while maintaining a structure in which the distance L1 in the X direction between the output terminal 21c of the first switch assembly 21 and the cathode terminal 31b of the first diode assembly 31, and the distance L2 in the X direction between the output terminal 22c of the second switch assembly 22 and the anode terminal 32a of the second diode assembly 32 are approximately equal, the power capacity of the power conversion device 100 can be increased. Furthermore, since the direction (X direction) in which the first switch assembly 21 and the second switch assembly 22 are arranged is orthogonal to the direction (Y direction) in which the parallel-connected switch assembly 20 is arranged, it is possible to suppress the power conversion device 100 from becoming too large in one direction compared to the case where all the components are arranged in one direction.

[0107] Furthermore, in the first embodiment, as described above, the power conversion device 100 is configured as a power conversion device mounted on the railway vehicle 10. The first switch assembly 21, the second switch assembly 22, the first diode assembly 31, and the second diode assembly 32 are arranged in the X-direction, the direction of travel of the railway vehicle 10. Therefore, by arranging the first switch assembly 21, the second switch assembly 22, the first diode assembly 31, and the second diode assembly 32 in the X-direction, it is easy to make the length of the wiring connecting the output terminal 21c of the first switch assembly 21 to the cathode terminal 31b of the first diode assembly 31 and the length of the wiring connecting the output terminal 22c of the second switch assembly 22 to the anode terminal 32a of the second diode assembly 32 approximately equal. As a result, when the components are arranged in a manner that runs along the direction of travel of the railway vehicle 10 (X direction), in a three-level circuit, it is possible to suppress the reduction of the degree of freedom in the arrangement of the components while making the surge voltage burden of the symmetrical semiconductor switching elements Q applied to the circuit approximately equal between the upper potential side and the lower potential side.

[0108] [Second Implementation]

[0109] Reference Figure 18 The second embodiment will be described below. In this second embodiment, unlike the first embodiment where the AC potential conductor 60 is constructed including the bend 60a, the AC potential conductor 260 is constructed without the bend. Furthermore, in the figures, portions of the same structure as in the first embodiment are labeled with the same reference numerals.

[0110] like Figure 18 As shown, the power conversion device 200 of the second embodiment of the present invention includes a power conversion section 210. The power conversion section 210 includes an AC potential conductor 260, a positive side connection conductor 271, and a negative side connection conductor 272.

[0111] The AC potential conductor 260 is configured to extend along the X direction. The AC potential conductor 260 is disposed below (Z2 side) both the positive side connecting conductor 271 and the negative side connecting conductor 272. In addition, the AC potential conductor 260 is disposed above (Z1 side) the first diode assembly 31, the first switch assembly 21, the second switch assembly 22 and the second diode assembly 32.

[0112] Similar to the AC potential conductor 60 of the first embodiment, the AC potential conductor 260 is configured such that its X1-side end is positioned in the X direction closer to the X1 side than the anode terminal 31a of the first diode assembly 31. However, unlike the AC potential conductor 60 of the first embodiment, the AC potential conductor 260 is configured such that its X2-side end is located near the upper side (Z1 side) of the cathode terminal 32b of the second diode assembly 32. Furthermore, unlike the AC potential conductor 60 of the first embodiment, the AC potential conductor 260 is configured such that its position (height position) in the Z direction is approximately equal (arranged on the same plane) from its X1-side end to its X2-side end. That is, in the power conversion section 210, the AC potential conductor 260 is configured without any bends.

[0113] The positive-side connecting conductor 271 and the negative-side connecting conductor 272 are each disposed on the same plane (at approximately the same height in the Z direction) below the leg 53 of the intermediate potential conductor 50 (Z2 side). Furthermore, the positive-side connecting conductor 271 and the negative-side connecting conductor 272 are each disposed above the AC potential conductor 260 (Z1 side). That is, the legs 41b of the positive potential conductor 41 and the legs 42b of the negative potential conductor 42 (distributed on the same plane), the leg 53 of the intermediate potential conductor 50, the positive-side connecting conductor 271 and the negative-side connecting conductor 272 (distributed on the same plane), and the AC potential conductor 260 are stacked in the above order, separated by an insulating member (not shown).

[0114] Furthermore, the other structures of the power conversion device 200 in the second embodiment are the same as those in the first embodiment described above.

[0115] (Effects of the second implementation method)

[0116] In the second embodiment, the following effects can be obtained.

[0117] In the second embodiment, as described above, the AC potential conductor 260 is configured to be at approximately the same height from the end on the X1 side to the end on the X2 side. This simplifies the conductor manufacturing process compared to the case where the AC potential conductor 260 includes a bend.

[0118] Furthermore, the other effects of the second embodiment are the same as those of the first embodiment described above.

[0119] [Third Implementation]

[0120] Reference Figure 19 and Figure 20 The third embodiment will be described below. In this third embodiment, the configuration of the first switching assembly 321 and the first diode assembly 331 in the X direction is the opposite of that in the first embodiment. Furthermore, in the figures, the same reference numerals are used for parts with the same structure as in the first embodiment described above.

[0121] like Figure 19 As shown, the power conversion device 300 of the third embodiment of the present invention includes a power conversion unit 310. The power conversion unit 310 includes two switching assemblies 320 (first switching assembly 321 and second switching assembly 322) and two diode assemblies 330 (first diode assembly 331 and second diode assembly 332).

[0122] The first switch assembly 321 has a positive terminal 321a, a negative terminal 321b, and an output terminal 321c as external connection terminals. The second switch assembly 322 has a positive terminal 322a, a negative terminal 322b, and an output terminal 322c as external connection terminals. The first diode assembly 331 has an anode terminal 331a and a cathode terminal 331b as external connection terminals. The second diode assembly 332 has an anode terminal 332a and a cathode terminal 332b as external connection terminals.

[0123] In the third embodiment, the first switch assembly 321, the first diode assembly 331, the second diode assembly 332, and the second switch assembly 322 are arranged in the X direction from the X1 side toward the X2 side in the order of the first switch assembly 321, the first diode assembly 331, the second diode assembly 332, and the second switch assembly 322. Furthermore, the first switch assembly 321, the first diode assembly 331, the second diode assembly 332, and the second switch assembly 322 are each arranged close to each other in the X direction.

[0124] Furthermore, in the third embodiment, unlike the first embodiment, the anode terminal 331a and cathode terminal 331b of the first diode assembly 331 are arranged in the X direction from the X2 side toward the X1 side in the order of anode terminal 331a and cathode terminal 331b. Similarly, the cathode terminal 332b and anode terminal 332a of the second diode assembly 332 are arranged in the X direction from the X1 side toward the X2 side in the order of cathode terminal 332b and anode terminal 332a. In other words, in the third embodiment, the terminal configuration (anode terminal 331a and cathode terminal 331b) of the first diode assembly 331 in the X direction is reversed compared to the first embodiment. Furthermore, the terminal configuration (anode terminal 332a and cathode terminal 332b) of the second diode assembly 332 in the X direction is reversed compared to the first embodiment.

[0125] Furthermore, in the third embodiment, similarly to the first embodiment, the distance L301 in the X direction between the output terminal 321c of the first switch assembly 321 and the cathode terminal 331b of the first diode assembly 331, and the distance L302 in the X direction between the output terminal 322c of the second switch assembly 322 and the anode terminal 332a of the second diode assembly 332 are approximately equal.

[0126] The power conversion unit 310 includes a positive potential conductor 341, a negative potential conductor 342, an intermediate potential conductor 350, an AC potential conductor 360, a positive side connection conductor 371, and a negative side connection conductor 372.

[0127] The positive potential conductor 341 includes a vertical wall portion 341a and a leg portion 341b. The leg portion 341b is configured to extend along the X1 direction from the lower end (Z2 side) of the vertical wall portion 341a.

[0128] The negative potential conductor 342 includes a vertical wall portion 342a and a leg portion 342b. The leg portion 342b is configured to extend along the X2 direction from the lower end (Z2 side) of the vertical wall portion 342a.

[0129] The intermediate potential conductor 350 includes a vertical wall portion 351 that extends along the Z direction. In the third embodiment, the vertical wall portion 351 is configured to be adjacent to the vertical wall portion 341a of the positive potential conductor 341 and the vertical wall portion 342a of the negative potential conductor 342. Specifically, the vertical wall portion 351 is disposed near the X2 side of the vertical wall portion 341a of the positive potential conductor 341 in the X direction opposite to the vertical wall portion 341a of the positive potential conductor 341, and is disposed near the X1 side of the vertical wall portion 342a of the negative potential conductor 342 in the X direction opposite to the vertical wall portion 342a of the negative potential conductor 342. That is, the vertical wall portions 341a and 351 of the positive potential conductor 341 and the vertical wall portion 342a of the negative potential conductor 342 are arranged to be stacked in the order of vertical wall portions 341a, 351, and 342a, separated by an insulating member (not shown). Furthermore, vertical wall portion 351 is an example of the "first vertical wall portion" and "second vertical wall portion" in the claims.

[0130] The intermediate potential conductor 350 includes a leg 353. In the third embodiment, the leg 353 is configured to be adjacent to the leg 341b of the positive potential conductor 341, the leg 342b of the negative potential conductor 342, and the AC potential conductor 360 in the Z direction. Specifically, the leg 353 of the intermediate potential conductor 350 is disposed near the lower side (Z2 side) of the leg 341b of the positive potential conductor 341, opposite to the leg 341b of the positive potential conductor 341 in the Z direction. Furthermore, the leg 353 of the intermediate potential conductor 350 is disposed near the lower side (Z2 side) of the leg 342b of the negative potential conductor 342, opposite to the leg 342b of the negative potential conductor 342 in the Z direction. Additionally, the leg 353 of the intermediate potential conductor 350 is disposed near the upper side (Z1 side) of the AC potential conductor 360, opposite to the AC potential conductor 360 in the Z direction.

[0131] The AC potential conductor 360 is disposed below (Z2 side) the legs 353 of the intermediate potential conductor 350, the positive side connecting conductor 371, and the negative side connecting conductor 372. Additionally, the AC potential conductor 360 is disposed above (Z1 side) the first switch assembly 321, the first diode assembly 331, the second diode assembly 332, and the second switch assembly 322.

[0132] The AC potential conductor 360 is configured such that its X1-side end is positioned in the X direction closer to the X1 side than the output terminal 321c of the first switch assembly 321. Furthermore, the AC potential conductor 360 is configured such that its X2-side end is positioned in the X direction near the upper side (Z1 side) of the output terminal 322c of the second switch assembly 322. Moreover, unlike the AC potential conductor 60 of the first embodiment, the AC potential conductor 260 is configured such that its position (height position) in the Z direction is approximately equal (arranged on the same plane) from its X1-side end to its X2-side end. That is, in the power conversion section 310, the AC potential conductor 360 is configured without any bends.

[0133] The positive-side connecting conductor 371 is disposed below the leg 341b of the positive potential conductor 341 (Z2 side). Similarly, the negative-side connecting conductor 372 is disposed below the leg 342b of the negative potential conductor 342 (Z2 side). Furthermore, the positive-side connecting conductor 371 and the negative-side connecting conductor 372 are disposed above the AC potential conductor 60 (Z1 side). Moreover, the positive-side connecting conductor 371 and the negative-side connecting conductor 372 are configured such that their Z-direction positions (height positions) are approximately equal to the Z-direction positions (height positions) of the leg 353 of the intermediate potential conductor 350 (distributed on the same plane). That is, the legs 341b of the positive potential conductor 341 and the legs 342b of the negative potential conductor 342 (arranged on the same plane), the legs 353 of the intermediate potential conductor 350 (arranged on the same plane), the positive side connecting conductor 371 and the negative side connecting conductor 372, and the AC potential conductor 360 are arranged to be stacked in the above order with an insulating member (not shown).

[0134] And, as Figure 20 As shown, in the power conversion unit 310, similarly to the first embodiment, the length of the wiring connecting the output terminal 321c of the first switch assembly 321 to the cathode terminal 331b of the first diode assembly 331 is approximately equal to the length of the wiring connecting the output terminal 322c of the second switch assembly 322 to the anode terminal 332a of the second diode assembly 332.

[0135] Furthermore, the other structures of the power conversion device 300 in the third embodiment are the same as those in the first embodiment described above.

[0136] (Effects of the third embodiment)

[0137] In the third embodiment, the following effects can be obtained.

[0138] In the third embodiment, as described above, the first switch assembly 321, the first diode assembly 331, the second diode assembly 332, and the second switch assembly 322 are arranged in the X-direction in the order of first switch assembly 321, first diode assembly 331, second diode assembly 332, and second switch assembly 322. Therefore, the switch assemblies 320 with terminals on one end and the other end in the X-direction are not adjacent to each other. Thus, the separation of the switch assemblies 320 in the X-direction to ensure insulation distance, as is required when the switch assemblies 320 are adjacent to each other, is unnecessary. As a result, compared to the case where the switch assemblies 320 are adjacent to each other, the components can be arranged to be close to each other, thereby enabling miniaturization of the power conversion device 300.

[0139] Furthermore, the other effects of the third embodiment are the same as those of the first embodiment described above.

[0140] [Fourth Implementation]

[0141] Reference Figure 21 and Figure 22 The fourth embodiment will be described. In this fourth embodiment, the terminal configuration of the first switch assembly 421 and the terminal configuration of the second switch assembly 422 in the X direction are reversed compared to the first embodiment. Furthermore, in the figures, the same reference numerals are used for parts with the same structure as in the first embodiment described above.

[0142] like Figure 21 As shown, the power conversion device 400 of the fourth embodiment of the present invention includes a power conversion unit 410. The power conversion unit 410 includes two switching assemblies 420 (first switching assembly 421 and second switching assembly 422) and two diode assemblies 430 (first diode assembly 431 and second diode assembly 432).

[0143] The first switch assembly 421 has a positive terminal 421a, a negative terminal 421b, and an output terminal 421c as external connection terminals. The second switch assembly 422 has a positive terminal 422a, a negative terminal 422b, and an output terminal 422c as external connection terminals. The first diode assembly 431 has an anode terminal 431a and a cathode terminal 431b as external connection terminals. The second diode assembly 432 has an anode terminal 432a and a cathode terminal 432b as external connection terminals.

[0144] In the fourth embodiment, similarly to the first embodiment, the first switch assembly 421, the first diode assembly 431, the second diode assembly 432, and the second switch assembly 422 are arranged in the X direction from the X1 side toward the X2 side in the order of the first switch assembly 421, the first diode assembly 431, the second diode assembly 432, and the second switch assembly 422. Furthermore, similarly to the first embodiment, the first switch assembly 421 and the second switch assembly 422 are configured to be separated in the X direction such that the shortest distance L11 between the terminals of the first switch assembly 421 and the terminals of the second switch assembly 422 is at least a predetermined insulation distance (determined by the power conversion device 400).

[0145] On the other hand, in the fourth embodiment, unlike the first embodiment, the output terminal 421c, negative terminal 421b, and positive terminal 421a of the first switch assembly 421 are arranged in the X direction from the X2 side towards the X1 side in the order of output terminal 421c, negative terminal 421b, and positive terminal 421a. Furthermore, the output terminal 422c, negative terminal 422b, and positive terminal 422a of the second switch assembly 422 are arranged in the X direction from the X1 side towards the X2 side in the order of output terminal 422c, negative terminal 422b, and positive terminal 422a.

[0146] Furthermore, in the fourth embodiment, similarly to the first embodiment, the distance L301 in the X direction between the output terminal 421c of the first switching assembly 421 and the cathode terminal 431b of the first diode assembly 431, and the distance L302 in the X direction between the output terminal 422c of the second switching assembly 422 and the anode terminal 432a of the second diode assembly 432 are approximately equal.

[0147] The power conversion unit 410 includes a positive potential conductor 441, a negative potential conductor 442, an intermediate potential conductor 450, an AC potential conductor 460, a positive side connection conductor 471, and a negative side connection conductor 472.

[0148] The positive potential conductor 441 includes a vertical wall portion 441a and a leg portion 441b. The leg portion 441b is configured to extend along the X2 direction from the lower end (Z2 side) of the vertical wall portion 441a. The vertical wall portion 441a of the positive potential conductor 441 is disposed on the X1 side of the first capacitor C1.

[0149] The negative potential conductor 442 includes a vertical wall portion 442a and a leg portion 442b. The leg portion 442b is configured to extend along the X1 direction from the lower end (Z2 side) of the vertical wall portion 442a. The vertical wall portion 442a of the negative potential conductor 442 is disposed on the X1 side of the second capacitor C2.

[0150] The intermediate potential conductor 450 includes a first vertical wall portion 451. The first vertical wall portion 451 is composed of a first portion 451a extending in the Z direction and a second portion 451b extending in the X direction. The second portion 451b is configured to extend in the X1 direction from the lower end (Z2 side) of the first portion 451a. In the fourth embodiment, similarly to the first embodiment, the first vertical wall portion 451 is configured to be adjacent to the vertical wall portion 441a of the positive potential conductor 441. Specifically, the first portion 451a of the first vertical wall portion 451 is disposed near the X1 side of the vertical wall portion 441a of the positive potential conductor 441, opposite to the vertical wall portion 441a of the positive potential conductor 441 in the X direction.

[0151] The intermediate potential conductor 450 includes a second vertical wall portion 452 extending in the Z direction. The second vertical wall portion 452 is composed of a first portion 452a extending in the Z direction and a second portion 452b extending in the X direction. The second portion 452b is formed to extend in the X2 direction from the lower end (Z2 side) of the first portion 452a. In the fourth embodiment, similarly to the first embodiment, the second vertical wall portion 452 is formed adjacent to the vertical wall portion 442a of the negative potential conductor 442. Specifically, the first portion 452a of the second vertical wall portion 452 is disposed near the X1 side of the vertical wall portion 442a of the negative potential conductor 442, opposite to the vertical wall portion 442a of the negative potential conductor 442 in the X direction.

[0152] The intermediate potential conductor 450 includes a leg 453 extending in the X direction. The leg 453 is disposed on the lower side (Z2 side) of both the second portion 451b of the first vertical wall portion 451 and the second portion 452b of the second vertical wall portion 452. Similar to the first embodiment, the leg 453 is fixed in contact with the second portion 451b of the first vertical wall portion 451 in the Z direction. Furthermore, the leg 453 is fixed in contact with the second portion 452b of the second vertical wall portion 452 in the Z direction. Also similar to the first embodiment, the leg 453 of the intermediate potential conductor 450 is disposed near the lower side (Z2 side) of the leg 441b of the positive potential conductor 441, opposite to the leg 441b of the positive potential conductor 441 in the Z direction. Furthermore, the leg 453 of the intermediate potential conductor 450 is positioned near the lower side (Z2 side) of the leg 442b of the negative potential conductor 442, opposite to the leg 442b of the negative potential conductor 442 in the Z direction. Additionally, the legs 441b of the positive potential conductor 441, the legs 442b of the negative potential conductor 442, the second portion 451b of the first vertical wall portion 451, and the second portion 452b of the second vertical wall portion 452 are arranged on the same plane.

[0153] The AC potential conductor 460 is disposed below (Z2 side) both the positive side connecting conductor 471 and the negative side connecting conductor 472. In addition, the AC potential conductor 460 is disposed above (Z1 side) the first switch assembly 421, the first diode assembly 431, the second diode assembly 432 and the second switch assembly 422.

[0154] The AC potential conductor 460 is configured such that its X1-side end is positioned in the X direction closer to the X1 side than the anode terminal 431a of the first diode assembly 431. Furthermore, the AC potential conductor 460 is configured such that its X2-side end is positioned in the X direction near the upper side (Z1 side) of the cathode terminal 432b of the second diode assembly 432. Unlike the AC potential conductor 460 in the first embodiment, the AC potential conductor 460 is configured such that its position (height position) in the Z direction is approximately equal (arranged on the same plane) from its X1-side end to its X2-side end. That is, in the power conversion unit 410, the AC potential conductor 460 is configured without any bends.

[0155] The positive-side connecting conductor 471 and the negative-side connecting conductor 472 are each disposed on the same plane below the leg 453 of the intermediate potential conductor 450 (Z2 side). Furthermore, the positive-side connecting conductor 471 and the negative-side connecting conductor 472 are disposed above the AC potential conductor 460 (Z1 side). That is, the legs 441b of the positive potential conductor 441, the legs 442b of the negative potential conductor 442, the second portions 451b and 452b of the first vertical wall portion 451 and the second vertical wall portion 452, the legs 453 of the intermediate potential conductor 450, the positive-side connecting conductor 471 and the negative-side connecting conductor 472, and the AC potential conductor 460 are stacked in the above order, separated by an insulating member (not shown).

[0156] And, as Figure 22 As shown, in the power conversion unit 410, similarly to the first embodiment, the length of the wiring connecting the output terminal 421c of the first switch assembly 421 to the cathode terminal 431b of the first diode assembly 431 is approximately equal to the length of the wiring connecting the output terminal 422c of the second switch assembly 422 to the anode terminal 432a of the second diode assembly 432.

[0157] Furthermore, the other structures of the power conversion device 400 in the fourth embodiment are the same as those in the first embodiment described above.

[0158] Furthermore, the effects of the fourth embodiment are the same as those of the first embodiment described above.

[0159] [Fifth Implementation]

[0160] Reference Figure 23 and Figure 24 The fifth embodiment will be described below. In this fifth embodiment, the configuration of the first switching assembly 521 and the first diode assembly 531 in the X direction, and the configuration of the second diode assembly 532 and the second switching assembly 522, are reversed compared to the first embodiment. Furthermore, in the figures, portions of the same structure as those in the first embodiment are labeled with the same reference numerals.

[0161] like Figure 23 As shown, the power conversion device 500 of the fifth embodiment of the present invention includes a power conversion unit 510. The power conversion unit 510 includes two switching assemblies 520 (first switching assembly 521 and second switching assembly 522) and two diode assemblies 530 (first diode assembly 531 and second diode assembly 532).

[0162] In the first switch assembly 521, a positive terminal 521a, a negative terminal 521b, and an output terminal 521c are provided as external connection terminals. In the second switch assembly 522, a positive terminal 522a, a negative terminal 522b, and an output terminal 522c are provided as external connection terminals. In the first diode assembly 531, an anode terminal 531a and a cathode terminal 531b are provided as external connection terminals. In the second diode assembly 532, an anode terminal 532a and a cathode terminal 532b are provided as external connection terminals.

[0163] In the fifth embodiment, the first switch assembly 521, the first diode assembly 531, the second diode assembly 532, and the second switch assembly 522 are arranged in the X direction from the X1 side toward the X2 side in the order of the first switch assembly 521, the first diode assembly 531, the second diode assembly 532, and the second switch assembly 522. Furthermore, the first switch assembly 521, the first diode assembly 531, the second diode assembly 532, and the second switch assembly 522 are each arranged close to each other in the X direction.

[0164] Furthermore, in the fifth embodiment, unlike the first embodiment, the output terminal 521c, negative terminal 521b, and positive terminal 521a of the first switch assembly 521 are arranged in the X direction from the X2 side towards the X1 side in the order of output terminal 521c, negative terminal 521b, and positive terminal 521a. Similarly, the output terminal 522c, negative terminal 522b, and positive terminal 522a of the second switch assembly 522 are arranged in the X direction from the X1 side towards the X2 side in the order of output terminal 522c, negative terminal 522b, and positive terminal 522a. In other words, in the fifth embodiment, the terminal configuration of the first switch assembly 521 in the X direction (the order of positive terminal 521a, negative terminal 521b, and output terminal 521c) is reversed compared to the first embodiment. Furthermore, the terminal configuration of the second switch assembly 522 configured in the X direction (the order of positive terminal 522a, negative terminal 522b, and output terminal 522c) is the opposite of that in the first embodiment.

[0165] Furthermore, in the fifth embodiment, similarly to the first embodiment, the distance L1 in the X direction between the output terminal 521c of the first switch assembly 521 and the cathode terminal 531b of the first diode assembly 531, and the distance L2 in the X direction between the output terminal 522c of the second switch assembly 522 and the anode terminal 532a of the second diode assembly 532 are approximately equal.

[0166] Furthermore, in the fifth embodiment, unlike the first embodiment, the anode terminal 531a and cathode terminal 531b of the first diode assembly 531 are arranged in the X direction from the X2 side toward the X1 side in the order of anode terminal 531a, cathode terminal 531b. Similarly, the cathode terminal 532b and anode terminal 532a of the second diode assembly 532 are arranged in the X direction from the X1 side toward the X2 side in the order of cathode terminal 532b, anode terminal 532a. In other words, in the fifth embodiment, the terminal configuration (anode terminal 531a and cathode terminal 531b order) of the first diode assembly 531 in the X direction is reversed compared to the first embodiment. Furthermore, the terminal configuration (anode terminal 532a and cathode terminal 532b order) of the second diode assembly 532 in the X direction is reversed compared to the first embodiment.

[0167] The power conversion unit 510 includes a positive potential conductor 541, a negative potential conductor 542, an intermediate potential conductor 550, an AC potential conductor 560, a positive side connection conductor 571, and a negative side connection conductor 572.

[0168] The positive potential conductor 541 includes a vertical wall portion 541a and a leg portion 541b. The leg portion 541b is configured to extend along the X1 direction from the lower end (Z2 side) of the vertical wall portion 541a. The vertical wall portion 541a of the positive potential conductor 541 is disposed on the X1 side of the first capacitor C1.

[0169] The negative potential conductor 542 includes a vertical wall portion 542a and a leg portion 542b. The leg portion 542b is configured to extend along the X2 direction from the lower end (Z2 side) of the vertical wall portion 542a. The vertical wall portion 542a of the negative potential conductor 542 is disposed on the X2 side of the second capacitor C2.

[0170] The intermediate potential conductor 550 includes a first vertical wall portion 551. The first vertical wall portion 551 is composed of a first portion 551a extending in the Z direction and a second portion 551 extending in the X direction. The second portion 551b is configured to extend in the X1 direction from the lower end (Z2 side) of the first portion 551a. In the fifth embodiment, similarly to the first embodiment, the first vertical wall portion 551 is configured to be adjacent to the vertical wall portion 541a of the positive potential conductor 541. Specifically, the first portion 551a of the first vertical wall portion 551 is disposed near the X1 side of the vertical wall portion 541a of the positive potential conductor 541, opposite to the vertical wall portion 541a of the positive potential conductor 541 in the X direction. Furthermore, the second part 551b of the first vertical wall portion 551 is configured such that its position (height position) in the Z direction is approximately equal to the position (height position) in the Z direction of the leg portion 541b of the positive potential conductor 541 (arranged on the same plane).

[0171] The intermediate potential conductor 550 includes a second vertical wall portion 552 extending in the Z direction. The second vertical wall portion 552 is composed of a first portion 552a extending in the Z direction and a second portion 552b extending in the X direction. The second portion 552b is formed to extend in the X1 direction from the lower end (Z2 side) of the first portion 552a. In the fifth embodiment, similarly to the first embodiment, the second vertical wall portion 552 is formed adjacent to the vertical wall portion 542a of the negative potential conductor 542. Specifically, the first portion 552a of the second vertical wall portion 552 is disposed near the X1 side of the vertical wall portion 542a of the negative potential conductor 542, opposite to the vertical wall portion 542a of the negative potential conductor 542 in the X direction. Furthermore, the second portion 552b of the second vertical wall portion 552 is configured such that its position (height position) in the Z direction is approximately equal to the position (height position) of the leg portion 542b of the negative potential conductor 542 in the Z direction (arranged on the same plane). Additionally, the second portion 552b of the second vertical wall portion 552 and the leg portion 542b of the negative potential conductor 542 are arranged on the same plane as the second portion 551b of the first vertical wall portion 551 and the leg portion 541b of the positive potential conductor 541.

[0172] The intermediate potential conductor 550 includes a leg 553 that extends in the X direction. The leg 553 is disposed on the lower side (Z2 side) of both the second portion 551b of the first vertical wall portion 551 and the second portion 552b of the second vertical wall portion 552. Similar to the first embodiment, the leg 553 is fixed in a state of contact with the second portion 551b of the first vertical wall portion 551 in the Z direction. In addition, the leg 553 is fixed in a state of contact with the second portion 552b of the second vertical wall portion 552 in the Z direction.

[0173] The AC potential conductor 560 is disposed below the positive-side connecting conductor 571 and the negative-side connecting conductor 572 (Z2 side). In addition, the AC potential conductor 560 is disposed above the first switch assembly 521, the first diode assembly 531, the second diode assembly 532 and the second switch assembly 522 (Z1 side).

[0174] The AC potential conductor 560 is configured such that its X1-side end is positioned in the X direction closer to the X1 side than the positive terminal 521a of the first switch assembly 521. Furthermore, the AC potential conductor 560 is configured such that its X2-side end is positioned in the X direction near the upper side (Z1 side) of the positive terminal 522a of the second switch assembly 522. Moreover, unlike the AC potential conductor 60 of the first embodiment, the AC potential conductor 560 has approximately equal positions (height positions) in the Z direction (arranged on the same plane) from its X1-side end to its X2-side end. That is, in the power conversion section 510, the AC potential conductor 560 is configured without any bends.

[0175] The positive-side connecting conductor 571 and the negative-side connecting conductor 572 are each disposed on the same plane below the leg 553 of the intermediate potential conductor 550 (Z2 side). Furthermore, the positive-side connecting conductor 571 and the negative-side connecting conductor 572 are disposed above the AC potential conductor 560 (Z1 side). That is, the leg 553 of the intermediate potential conductor 550, the positive-side connecting conductor 571 and the negative-side connecting conductor 572, and the AC potential conductor 560 are arranged to be stacked in the above order, separated by an insulating member (not shown).

[0176] And, as Figure 24 As shown, in the power conversion unit 510, similarly to the first embodiment, the length of the wiring connecting the output terminal 521c of the first switch assembly 521 to the cathode terminal 531b of the first diode assembly 531 is approximately equal to the length of the wiring connecting the output terminal 522c of the second switch assembly 522 to the anode terminal 532a of the second diode assembly 532.

[0177] Furthermore, the other structures of the power conversion device 500 in the fifth embodiment are the same as those in the first embodiment described above.

[0178] (Effects of the fifth embodiment)

[0179] In the fifth embodiment, the following effects can be obtained.

[0180] In the fifth embodiment, as described above, the first switch assembly 521, the first diode assembly 531, the second diode assembly 532, and the second switch assembly 522 are arranged in the X-direction in the order of first switch assembly 521, first diode assembly 531, second diode assembly 532, and second switch assembly 522. Therefore, the switch assemblies 520 with terminals on one end and the other end in the X-direction are not adjacent to each other. Thus, the separation of the switch assemblies 520 in the X-direction to ensure insulation distance, as is required when the switch assemblies 520 are adjacent to each other, is unnecessary. As a result, compared to the case where the switch assemblies 520 are adjacent to each other, the assemblies can be arranged to be close to each other, thereby enabling miniaturization of the power conversion device 500.

[0181] Furthermore, the other effects of the fifth embodiment are the same as those of the first embodiment described above.

[0182] [Variation Example]

[0183] All aspects of the embodiments described in this application should be considered illustrative rather than limiting. The scope of the invention is not shown by the above description of the embodiments, but is defined by the claims, and the scope of the invention also includes all modifications (variations) with the same meaning and scope as the claims.

[0184] For example, in the first to fifth embodiments described above, examples are shown where the first switch assembly 21 (321, 421, 521) and the second switch assembly 22 (322, 422, 522) are constructed from substantially the same package, but the present invention is not limited thereto. In the present invention, the first switch assembly and the second switch assembly may also be constructed from different packages.

[0185] Furthermore, in the first to fifth embodiments described above, examples were shown where the first diode assembly 31 (331, 431, 531) and the second diode assembly 32 (332, 432, 532) were constructed using substantially the same package, but the present invention is not limited thereto. In the present invention, the first diode assembly and the second diode assembly may also be constructed using different packages.

[0186] Furthermore, in the first to fifth embodiments described above, an example was shown in which the positive terminals 21a (321a, 421a, 521a), negative terminals 21b (321b, 421b, 521b), and output terminals 21c (321c, 42c1, 521c) of the first switch assembly 21 (321, 421, 521) were arranged in a manner substantially symmetrical with respect to the center line 91 with the positive terminals 22a (322a, 422a, 522a), negative terminals 22b (322b, 422b, 522b), and output terminals 22c (322c, 422c, 522c) of the second switch assembly 22 (322, 422, 522). However, the present invention is not limited to this. In this invention, the positive and negative terminals of the first switch assembly and the positive and negative terminals of the second switch assembly may not be configured to be approximately symmetrical with respect to the center line, but the output terminals of the first switch assembly and the output terminals of the second switch assembly may be configured to be approximately symmetrical with respect to the center line.

[0187] Furthermore, in the first to fifth embodiments described above, an example was shown in which the cathode terminals 31b (331b, 431b, 531b) and anode terminals 31a (331a, 431a, 531a) of the first diode assembly 31 (331, 431, 531) and the anode terminals 32a (332a, 432a, 532a) and cathode terminals 32b (332b, 432b, 532b) of the second diode assembly 32 (332, 432, 532) were arranged substantially symmetrically with respect to the center line 91. However, the present invention is not limited to this. In the present invention, it is also possible that the anode terminals of the first diode assembly and the cathode terminals of the second diode assembly are not arranged substantially symmetrically with respect to the center line, but rather the cathode terminals of the first diode assembly and the anode terminals of the second diode assembly are arranged substantially symmetrically with respect to the center line.

[0188] Furthermore, in the first to fifth embodiments described above, an example was shown in which at least two terminals of the positive terminal 20a, negative terminal 20b, and output terminal 20c of the first switch assembly 21 (321, 421, 521) were respectively disposed at one end 20d and the other end 20e in the X direction, and at least two terminals of the positive terminal 20a, negative terminal 20b, and output terminal 20c of the second switch assembly 22 (322, 422, 522) were respectively disposed at one end 20d and the other end 20e in the X direction, but the present invention is not limited thereto. In the present invention, it is also possible to configure the switch assembly so that no terminal of the positive terminal, negative terminal, and output terminal of the first switch assembly is disposed at any one end of the X direction, and no terminal of the second switch assembly is disposed at any one end of the X direction, and no terminal of the positive terminal, negative terminal, and output terminal is disposed at any one end of the X direction, and no terminal of the second switch assembly is disposed at any one end of the X direction, and no terminal of the positive terminal, negative terminal, and output terminal is disposed at any one end of the X direction, and no terminal of the second switch assembly is disposed at any one end of the X direction, and no terminal of the second switch assembly is disposed at any one end of the X direction, and no terminal of the first ...

[0189] Furthermore, in the first to fifth embodiments described above, an example was shown in which the anode terminal 30a and cathode terminal 30b of the first diode assembly 31 (331, 431, 531) and the anode terminal 30a and cathode terminal 30b of the second diode assembly 32 (332, 432, 532) were respectively disposed in the central portion 30c in the X direction, but the present invention is not limited thereto. In the present invention, at least one of the anode and cathode terminals of the first diode assembly and at least one of the anode and cathode terminals of the second diode assembly may be disposed at one end in the X direction or at the other end in the X direction.

[0190] Furthermore, in the first embodiment described above, an example was shown where the AC potential conductor 60 was configured to include a bent portion 60a that was bent in a manner separate from the region R of the control substrate 20g where the first switch assembly 21 is disposed, but the present invention is not limited thereto. In the present invention, the AC potential conductor may also be configured to include a bent portion that is bent in a manner separate from the region of the control substrate where the second switch assembly is disposed. In addition, in the structures of the third to fifth embodiments described above (of the component configuration or the component terminal configuration), the AC potential conductor may also be configured to include a bent portion that is bent in a manner separate from the region of the control substrate where at least one of the first switch assembly and the second switch assembly is disposed.

[0191] Furthermore, in the first to fifth embodiments described above, an example was shown in which two first switch assemblies 21 (321, 421, 521) and two second switch assemblies 22 (322, 422, 522) were each configured to be connected in parallel in a manner arranged along the Y direction; however, the present invention is not limited thereto. In the present invention, as... Figure 25Like the power conversion unit 610 of the power conversion device 600 in the first modified example shown, the first switch assembly and the second switch assembly can each be configured to be three units connected in parallel in a manner arranged along the Y direction. Alternatively, the first switch assembly and the second switch assembly can each be configured to be four or more units connected in parallel in a manner arranged along the Y direction. Furthermore, the first switch assembly and the second switch assembly can each be configured to be one unit, without being connected in parallel. Additionally, the first diode assembly and the second diode assembly can each be configured to have multiple units connected in parallel in a manner arranged along the Y direction.

[0192] Furthermore, in the first to fifth embodiments described above, an example was shown where the semiconductor switching element Q was configured as a MOSFET, but the present invention is not limited thereto. In the present invention, as... Figure 26 As with the power conversion device 700 of the second modified example shown, the semiconductor switching element can also be configured as an IGBT (Insulated Gate Bipolar Transistor).

[0193] like Figure 26 As shown, the power conversion device 700 includes a power conversion section 710. The power conversion section 710 includes four semiconductor switching elements Q (a first switching element Q701, a second switching element Q702, a third switching element Q703, and a fourth switching element Q704). The semiconductor switching elements Q are IGBTs made of silicon (Si) semiconductors. The power conversion section 710 includes two switching assemblies 720 (a first switching assembly 721 and a second switching assembly 722). The first switching assembly 721 houses the first switching element Q701 and the second switching element Q702. Furthermore, the second switching element Q702 houses the third switching element Q703 and the fourth switching element Q704.

[0194] Furthermore, in the first to fifth embodiments described above, an example was shown in which the direction of the sleepers orthogonal to the travel direction of the railway vehicle 10 was configured as the Y direction and the vertical direction of the railway vehicle 10 was configured as the Z direction; however, the present invention is not limited to this. In the present invention, the direction of the sleepers orthogonal to the travel direction of the railway vehicle may also be configured as the Z direction and the vertical direction of the railway vehicle may be configured as the Y direction.

[0195] Furthermore, in the first to fifth embodiments described above, examples were shown in which the power conversion device 100 (200, 300, 400, 500) was configured as a power conversion device mounted on a railway vehicle 10, but the present invention is not limited thereto. In the present invention, the power conversion device may also be configured as a power conversion device mounted on a device other than a railway vehicle (for use outside of a railway vehicle).

Claims

1. A power conversion device that outputs power at three potential levels: upper potential, intermediate potential, and lower potential, wherein, This power conversion device has the following features: A switching assembly comprising two semiconductor switching elements arranged such that a positive terminal, a negative terminal, and an output terminal are arranged along a first direction; and A diode assembly comprising a diode and arranged such that its anode and cathode terminals are arranged along the first direction. The switching assembly includes: A first switching assembly has a positive terminal, a negative terminal, and an output terminal serving as upper potential terminals; and The second switching assembly has the negative terminal, the positive terminal, and the output terminal serving as lower potential terminals. The diode assembly includes: A first diode assembly having a cathode terminal connected to the output terminal of the first switching assembly, and an anode terminal serving as an intermediate potential terminal; and The second diode assembly has an anode terminal connected to the output terminal of the second switch assembly, and a cathode terminal serving as an intermediate potential terminal. The power conversion device is configured such that the distance in the first direction between the output terminal of the first switching assembly and the cathode terminal of the first diode assembly is equal to the distance in the first direction between the output terminal of the second switching assembly and the anode terminal of the second diode assembly.

2. The power conversion device according to claim 1, wherein, The output terminal of the first switching assembly and the output terminal of the second switching assembly are arranged symmetrically with respect to a centerline along a second direction orthogonal to the first direction, and the cathode terminal of the first diode assembly and the anode terminal of the second diode assembly are arranged symmetrically with respect to the centerline.

3. The power conversion device according to claim 2, wherein, The positive terminal, negative terminal, and output terminal of the first switching assembly are arranged symmetrically with respect to the center line with the positive terminal, negative terminal, and output terminal of the second switching assembly, and the cathode terminal and anode terminal of the first diode assembly are arranged symmetrically with respect to the center line with the anode terminal and cathode terminal of the second diode assembly.

4. The power conversion device according to claim 2, wherein, The first switch assembly and the second switch assembly are constructed from the same package and are arranged symmetrically with respect to the center line. The first diode assembly and the second diode assembly are made of the same package and are arranged symmetrically with respect to the center line.

5. The power conversion device according to claim 2, wherein, At least two terminals of the positive terminal, the negative terminal, and the output terminal of the first switching assembly are respectively disposed at one end of the first direction and the other end of the first switching assembly. Similarly, at least two terminals of the positive terminal, the negative terminal, and the output terminal of the second switching assembly are respectively disposed at one end of the first direction and the other end of the second switching assembly. The anode and cathode terminals of the first diode assembly and the anode and cathode terminals of the second diode assembly are respectively disposed at the central portion in the first direction.

6. The power conversion device according to claim 5, wherein, The first diode assembly, the first switch assembly, the second switch assembly, and the second diode assembly are arranged in the order of the first diode assembly, the first switch assembly, the second switch assembly, and the second diode assembly along the first direction. The first switch assembly and the second switch assembly are configured to be separated in the first direction such that the shortest distance between any one of the positive terminal, the negative terminal and the output terminal of the first switch assembly and any one of the positive terminal, the negative terminal and the output terminal of the second switch assembly is greater than or equal to a predetermined insulation distance.

7. The power conversion device according to claim 2, wherein, The power conversion device also features: The first capacitor and the second capacitor are connected in series. A positive potential conductor, which is connected to the positive terminal of the first capacitor and the positive side terminal of the first switching assembly; A negative potential conductor, which is connected to the negative terminal of the second capacitor and the negative side terminal of the second switching assembly; and An intermediate potential conductor is connected to the negative terminal of the first capacitor, the positive terminal of the second capacitor, the anode terminal of the first diode assembly, and the cathode terminal of the second diode assembly. The positive and negative potential conductors each include a vertical wall portion, which extends along a third direction orthogonal to both the first and second directions. The intermediate potential conductor includes a first vertical wall portion and a second vertical wall portion, which are configured to extend along the third direction in a manner adjacent to the vertical wall portions of the positive potential conductor and the negative potential conductor, respectively.

8. The power conversion device according to claim 7, wherein, The positive potential conductor and the negative potential conductor each further include legs formed in a manner extending along the first direction. The intermediate potential conductor also includes legs configured to extend along the first direction adjacent to the legs of the positive potential conductor and the negative potential conductor in the third direction.

9. The power conversion device according to claim 2, wherein, The power conversion device also includes an AC potential conductor, which is connected to the negative terminal of the first switching assembly and the positive terminal of the second switching assembly, and is configured to extend along the first direction. The AC potential conductor includes a bend that is bent in a manner separate from the area of ​​the control substrate on which at least one of the first and second switching assemblies is configured.

10. The power conversion device according to claim 2, wherein, The first switch assembly and the second switch assembly are each connected in parallel in a manner arranged along the second direction.

11. The power conversion device according to claim 1, wherein, The power conversion device is a power conversion device mounted on railway vehicles. The first switch assembly, the second switch assembly, the first diode assembly, and the second diode assembly are arranged in a manner that aligns with the first direction, which is the direction of travel of the railway vehicle.

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