Power converter

Abstract

To provide a power conversion device in which occurrence of current unbalance between a plurality of switching modules can be suppressed.SOLUTION: A power conversion device includes a pair of first switching modules including a first switching element and a second switching element that are connected in series, a pair of second switching modules including a third switching element and a fourth switching element that are connected in series, a first conductor with a plate shape electrically connected to one of a pair of input-output terminals of an AC circuit, and a second conductor with a plate shape electrically connected to the other of the pair of input-output terminals of the AC circuit and overlapped with the first conductor with a predetermined space. The pair of first switching modules is arranged beside the first conductor and the second conductor. The pair of second switching modules is arranged between the pair of first switching module.SELECTED DRAWING: Figure 1

Description

【Technical Field】 , 【0005】 【0001】 Embodiments of the present invention relate to a power conversion device. 【Background Art】 【0002】 There is a power conversion device including a first switching module and a second switching module. The first switching module has a first switching element and a second switching element connected in series. The second switching module has a third switching element and a fourth switching element connected in series. In other words, the first switching module and the second switching module have a half-bridge circuit. The power conversion device constitutes a full-bridge circuit by the first switching module and the second switching module, and performs at least one of conversion from DC power to AC power and conversion from AC power to DC power by switching each switching element. 【0003】 In such a power conversion device, a plurality of first switching modules and a plurality of second switching modules are provided, and the plurality of first switching modules are connected in parallel and the plurality of second switching modules are connected in parallel. This makes it possible to handle a large amount of power while suppressing an increase in the allowable values of current and voltage required for each switching element. 【0004】 However, as described above, when a plurality of first switching modules connected in parallel and a plurality of second switching modules connected in parallel are provided and the switching modules are arranged side by side, depending on the arrangement of the switching modules, an imbalance may occur in the magnitude of the current flowing through each switching module. 【0005】 For example, if a current imbalance occurs and current concentrates on a particular switching module, the temperature burden on that switching module increases. Therefore, measures such as increasing the cooling capacity of the switching modules or increasing the number of parallel connections between each switching module become necessary, which could lead to larger equipment and increased costs. 【0006】 Therefore, in power conversion devices that connect multiple switching modules in parallel, it is desirable to suppress the occurrence of current imbalances between the multiple switching modules. [Prior art documents] [Patent Documents] 【0007】 [Patent Document 1] Japanese Patent Publication No. 2019-134543 [Overview of the Initiative] [Problems that the invention aims to solve] 【0008】 The embodiment provides a power conversion device that can suppress the occurrence of current imbalances between multiple switching modules. [Means for solving the problem] 【0009】 According to this embodiment, a power conversion device connected to a DC circuit and an AC circuit, which performs at least one of the conversions from DC power to AC power and from AC power to DC power, comprises: a pair of first switching modules having a first switching element and a second switching element connected in series; a pair of second switching modules having a third switching element and a fourth switching element connected in series; a plate-shaped first conductor electrically connected to one of a pair of input / output terminals of the AC circuit; and a plate-shaped second conductor electrically connected to the other of the pair of input / output terminals of the AC circuit and provided overlapping with the first conductor at a predetermined distance, wherein each of the pair of first switching modules is electrically connected to the DC circuit via both ends of the first and second switching elements, and is electrically connected to the first conductor and one of the pair of input / output terminals of the AC circuit via the connection point of the first and second switching elements, thereby connecting them in parallel; and each of the pair of second switching modules is connected to the third switching element and the A power conversion device is provided in which the pair of first switching modules and the pair of second switching modules are electrically connected to the DC circuit via both ends of the fourth switching element, and are electrically connected to the second conductor and the other of the pair of input / output terminals of the AC circuit via the connection point of the third and fourth switching elements, thereby being connected in parallel to each other, the first switching module and the pair of second switching modules constitute a full bridge circuit with the first switching element, the second switching element, the third switching element, and the fourth switching element, and at least one of the conversion from DC power to AC power and the conversion from AC power to DC power is performed by switching the first switching element, the second switching element, the third switching element, and the fourth switching element, the pair of first switching modules are provided side by side with the first conductor and the second conductor, and the pair of second switching modules are provided side by side with the first conductor and the second conductor together with the pair of first switching modules, and are arranged between the pair of first switching modules. [Effects of the Invention] 【0010】 In this embodiment, a power conversion device is provided that can suppress the occurrence of current imbalance between multiple switching modules. [Brief explanation of the drawing] 【0011】 [Figure 1] This is a schematic block diagram showing a power conversion device according to an embodiment. [Figure 2] This is an explanatory diagram schematically representing a power conversion device according to an embodiment. [Figure 3] This is an explanatory diagram schematically representing a power conversion device according to an embodiment. [Figure 4] This is a schematic diagram illustrating a power conversion device for reference. [Modes for carrying out the invention] 【0012】 Embodiments of the present invention will be described below with reference to the drawings. Please note that the drawings are schematic or conceptual, and the relationships between the thickness and width of each part, as well as the ratios of the sizes of the parts, are not necessarily identical to those of reality. Furthermore, even when representing the same part, the dimensions and ratios may differ between drawings. In this specification and in each figure, elements similar to those described above in previously mentioned figures are denoted by the same reference numerals, and detailed explanations are omitted as appropriate. 【0013】 Figure 1 is a schematic block diagram showing a power conversion device according to an embodiment. As shown in Figure 1, the power converter 10 comprises a pair of first switching modules 11 and a pair of second switching modules 12. 【0014】 In this example, the power converter 10 comprises two pairs of first switching modules 11 and two pairs of second switching modules 12. In other words, the power converter 10 comprises four first switching modules 11 and four second switching modules 12. 【0015】 However, the number of first switching modules 11 and second switching modules 12 provided in the power converter 10 is not limited to the above. The power converter 10 may include three or more pairs of first switching modules 11 and three or more pairs of second switching modules 12. The power converter 10 only needs to include at least one pair of first switching modules 11 (two first switching modules 11) and one pair of second switching modules 12 (two second switching modules 12). 【0016】 The power converter 10 is connected to the DC circuit 2 and the AC circuit 4. The power converter 10 performs at least one of the following: conversion from DC power to AC power and conversion from AC power to DC power. In other words, the power converter 10 performs at least one of the following operations: converting DC power supplied from the DC circuit 2 to AC power and supplying the converted AC power to the AC circuit 4, and converting AC power supplied from the AC circuit 4 to DC power and supplying the converted DC power to the DC circuit 2. 【0017】 DC circuit 2 is, for example, a DC power supply or DC load. AC circuit 4 is, for example, an AC power supply, an AC load, or a power system. DC circuit 2 and AC circuit 4 may also be, for example, other converters. DC circuit 2 and AC circuit 4 are not limited to the above and may be any circuits. 【0018】 Each of the pair of first switching modules 11 has a first switching element 21 and a second switching element 22 connected in series. Each of the pair of second switching modules 12 has a third switching element 23 and a fourth switching element 24 connected in series. In other words, the first switching module 11 and the second switching module 12 have half-bridge circuits. 【0019】 Each of the first switching element 21, the second switching element 22, the third switching element 23, and the fourth switching element 24 has a pair of main terminals and a control terminal. Also, each of the first switching element 21, the second switching element 22, the third switching element 23, and the fourth switching element 24 has an on state and an off state. 【0020】 The on state is a state in which current flows between the pair of main terminals. The off state is a state in which the flow of current between the pair of main terminals is interrupted. Each of the first switching element 21, the second switching element 22, the third switching element 23, and the fourth switching element 24 switches between the on state and the off state according to the voltage between the pair of main terminals and the voltage of the control terminal. Note that the off state is not limited to a state in which no current flows between the pair of main terminals, and a weak current within a range that does not affect the operation of the power conversion device 10 may flow between the pair of main terminals. 【0021】 The first switching element 21, the second switching element 22, the third switching element 23, and the fourth switching element 24 are, for example, IGBTs. The plurality of first switching modules 11 and the plurality of second switching modules 12 are, in other words, IGBT modules. However, the first switching element 21, the second switching element 22, the third switching element 23, and the fourth switching element 24 are not limited to IGBTs, and may be other self-excited semiconductor elements such as MOSFETs. The first switching element 21, the second switching element 22, the third switching element 23, and the fourth switching element 24 are not limited to the above, and may be any element capable of arbitrarily switching between an on state and an off state. 【0022】 Each of the pair of first switching modules 11 has a first DC terminal 11a, a second DC terminal 11b, and a first AC terminal 11c. Each of the pair of first switching modules 11 also has a first housing 11d. The first switching element 21 and the second switching element 22 are provided inside the first housing 11d. In other words, the first housing 11d houses the first switching element 21 and the second switching element 22 inside. The first housing 11d is, for example, an insulating package. 【0023】 The first DC terminal 11a, the second DC terminal 11b, and the first AC terminal 11c are provided on the outer surface of the first housing 11d and are used for electrical connection with external devices. The first AC terminal 11c is provided, for example, on one end side of the first housing 11d. The first DC terminal 11a and the second DC terminal 11b are provided, for example, on the other end side of the first housing 11d. In other words, the first DC terminal 11a and the second DC terminal 11b are provided at the end of the first housing 11d opposite to the first AC terminal 11c. The first housing 11d is, for example, substantially rectangular parallelepiped. The shape of the first housing 11d when viewed from above is substantially rectangular. The first AC terminal 11c is provided, for example, on one end side in the longitudinal direction of the substantially rectangular parallelepiped first housing 11d. The first DC terminal 11a and the second DC terminal 11b are provided, for example, on the other end side in the longitudinal direction of the substantially rectangular parallelepiped first housing 11d. 【0024】 However, the shape of the first housing 11d is not limited to the above and may be any shape. The arrangement of the first DC terminal 11a, the second DC terminal 11b, and the first AC terminal 11c is not limited to the above and may be any arrangement. 【0025】 The first DC terminal 11a is electrically connected to one main terminal of the first switching element 21 within the first housing 11d. The other main terminal of the first switching element 21 is electrically connected to one main terminal of the second switching element 22. The other main terminal of the second switching element 22 is electrically connected to the second DC terminal 11b. In other words, the second DC terminal 11b is electrically connected to the other main terminal of the second switching element 22 within the first housing 11d. The first AC terminal 11c is electrically connected to the connection point between the other main terminal of the first switching element 21 and one main terminal of the second switching element 22 within the first housing 11d. 【0026】 Thus, in the first switching module 11, the ends of the first switching element 21 and the second switching element 22, which are connected in series, form a pair of DC connection points, and the connection point between the first switching element 21 and the second switching element 22 forms an AC connection point. 【0027】 Furthermore, each of the pair of first switching modules 11, although not shown in the figures, further has a terminal for inputting a control signal to the control terminal of the first switching element 21 and a terminal for inputting a control signal to the control terminal of the second switching element 22. Each terminal is provided on the outer surface of the first housing 11d. The on and off states of the first switching element 21 and the second switching element 22 are switched by inputting control signals to the control terminals via the terminals provided on the first housing 11d. 【0028】 Each of the pair of second switching modules 12 has a third DC terminal 12a, a fourth DC terminal 12b, and a second AC terminal 12c. Each of the pair of second switching modules 12 also has a second housing 12d. The second AC terminal 12c is provided, for example, on one end of the second housing 12d. The third DC terminal 12a and the fourth DC terminal 12b are provided, for example, on the other end of the second housing 12d. The configuration of the second switching module 12 is substantially the same as that of the first switching module 11, so a detailed explanation is omitted. 【0029】 Each first DC terminal 11a of the pair of first switching modules 11 is electrically connected to the high-potential terminal 2a of the DC circuit 2. Each second DC terminal 11b of the pair of first switching modules 11 is electrically connected to the low-potential terminal 2b of the DC circuit 2. Each first AC terminal 11c of the pair of first switching modules 11 is electrically connected to one of the pair of input / output terminals 4a and 4b of the AC circuit 4. Each first AC terminal 11c of the pair of first switching modules 11 is electrically connected to, for example, the input / output terminal 4a of the AC circuit 4. 【0030】 In other words, each of the pair of first switching modules 11 is electrically connected to the DC circuit 2 via the ends of the first switching element 21 and the second switching element 22, and is also electrically connected to one of the pair of input / output terminals 4a and 4b of the AC circuit 4 via the connection point of the first switching element 21 and the second switching element 22. As a result, each of the pair of first switching modules 11 is connected to each other in parallel. 【0031】 Each of the pair of second switching modules 12 has a third DC terminal 12a that is electrically connected to the high-potential terminal 2a of the DC circuit 2. Each of the pair of second switching modules 12 has a fourth DC terminal 12b that is electrically connected to the low-potential terminal 2b of the DC circuit 2. Each of the pair of second switching modules 12 has a second AC terminal 12c that is electrically connected to the other of the pair of input / output terminals 4a and 4b of the AC circuit 4. Each of the pair of second switching modules 12 has a second AC terminal 12c that is electrically connected to, for example, the input / output terminal 4b of the AC circuit 4. 【0032】 In other words, each of the pair of second switching modules 12 is electrically connected to the DC circuit 2 via the ends of the third switching element 23 and the fourth switching element 24, and is also electrically connected to the other of the pair of input / output terminals 4a and 4b of the AC circuit 4 via the connection point of the third switching element 23 and the fourth switching element 24. As a result, each of the pair of second switching modules 12 is connected to each other in parallel. 【0033】 A pair of first switching modules 11 and a pair of second switching modules 12 constitute a full-bridge circuit FBC with a first switching element 21, a second switching element 22, a third switching element 23, and a fourth switching element 24, and at least one of the following is performed by switching the first switching element 21, the second switching element 22, the third switching element 23, and the fourth switching element 24: conversion from DC power to AC power and conversion from AC power to DC power. 【0034】 The first switching module 11 constitutes, for example, one leg of a pair of single-phase full-bridge circuits, and the second switching module 12 constitutes, for example, the other leg of a pair of single-phase full-bridge circuits. In other words, the first switching module 11 is a switching module electrically connected to one input / output terminal 4a of the AC circuit 4 in a plurality of switching modules for configuring a full-bridge circuit FBC. In other words, the second switching module 12 is a switching module electrically connected to the other input / output terminal 4b of the AC circuit 4 in a plurality of switching modules for configuring a full-bridge circuit FBC. 【0035】 In this way, the power converter 10 connects multiple first switching modules 11 and multiple second switching modules 12 in parallel. This allows the power converter 10 to handle large amounts of power while suppressing an increase in the allowable current and voltage values ​​required for each switching element 21-24. The number of pairs of first switching modules 11 and the number of pairs of second switching modules 12 can be set appropriately according to the amount of power to be handled. 【0036】 The AC power of AC circuit 4 is, for example, single-phase AC power. The power converter 10 performs, for example, at least one of the following: conversion from DC power to single-phase AC power and conversion from single-phase AC power to DC power. However, the AC power of AC circuit 4 may also be, for example, three-phase AC power. The power converter 10 may be configured to perform, for example, at least one of the following: conversion from DC power to three-phase AC power and conversion from three-phase AC power to DC power using three single-phase full-bridge circuits. The pair of first switching modules 11 and the pair of second switching modules 12 may, for example, correspond to one phase of three-phase AC power. 【0037】 Figures 2 and 3 are schematic explanatory diagrams illustrating a power conversion device according to an embodiment. As shown in Figures 2 and 3, the power converter 10 further comprises a first conductor 31 and a second conductor 32. The first conductor 31 is a plate-shaped conductor electrically connected to one of the pair of input / output terminals 4a and 4b of the AC circuit 4, namely input / output terminal 4a. The second conductor 32 is a plate-shaped conductor electrically connected to the other of the pair of input / output terminals 4a and 4b of the AC circuit 4, namely input / output terminal 4b. The first conductor 31 and the second conductor 32 may also be called, for example, busbars. 【0038】 The second conductor 32 is provided overlapping the first conductor 31 with a predetermined gap between them. The second conductor 32 overlaps the plate-shaped first conductor 31 and the second conductor 32 in the thickness direction of the two conductors. In other words, the thickness direction is perpendicular to the upper and lower surfaces of the plate-shaped first conductor 31 and the second conductor 32. 【0039】 An insulating sheet or the like may be provided between the first conductor 31 and the second conductor 32. An air layer or the like may be provided between the first conductor 31 and the second conductor 32. The material between the first conductor 31 and the second conductor 32 may be any material that can adequately ensure electrical insulation between the first conductor 31 and the second conductor 32. The distance (spacing) between the first conductor 31 and the second conductor 32 may be any distance that can adequately ensure electrical insulation between the first conductor 31 and the second conductor 32. 【0040】 In Figure 3, for ease of illustration, the second conductor 32 is shown slightly offset from the first conductor 31. The external shape of the second conductor 32 may be substantially the same as that of the first conductor 31. The second conductor 32 may be positioned to completely overlap the first conductor 31. However, the shape of the second conductor 32 does not necessarily have to be the same as that of the first conductor 31. The second conductor 32 should be positioned so that at least a portion of it overlaps the first conductor 31 in the thickness direction. 【0041】 Each of the pair of first switching modules 11 is electrically connected to the first conductor 31 via the connection point of the first switching element 21 and the second switching element 22. In other words, each of the pair of first switching modules 11 is electrically connected to the first conductor 31 via the first AC terminal 11c. Each of the pair of first switching modules 11 is mechanically and electrically connected to the first conductor 31, for example by screw fastening, and is electrically connected to one of the input / output terminals 4a, 4b of the pair of input / output terminals 4a, 4b of the AC circuit 4 via the first conductor 31. 【0042】 Each of the pair of second switching modules 12 is electrically connected to the second conductor 32 via the connection points of the third switching element 23 and the fourth switching element 24. In other words, each of the pair of second switching modules 12 is electrically connected to the second conductor 32 via the second AC terminal 12c. Each of the pair of second switching modules 12 is mechanically and electrically connected to the second conductor 32, for example by screw fastening, and is electrically connected via the second conductor 32 to the other input / output terminal 4b of the pair of input / output terminals 4a and 4b of the AC circuit 4. 【0043】 The pair of first switching modules 11 are arranged side by side to the first conductor 31 and the second conductor 32. In other words, the pair of first switching modules 11 are arranged adjacent to the first conductor 31 and the second conductor 32 in a direction perpendicular to the thickness direction of the first conductor 31 and the second conductor 32. 【0044】 The shape of the first conductor 31 and the second conductor 32 when viewed from above is, for example, approximately rectangular. The pair of first switching modules 11 are arranged, for example, along one longitudinal side of the rectangular first conductor 31 and the second conductor 32. However, the shape of the first conductor 31 and the second conductor 32 is not limited to the above and may be any shape. 【0045】 The pair of second switching modules 12 are provided alongside the pair of first switching modules 11, side by side with the first conductor 31 and the second conductor 32, and are positioned between the pair of first switching modules 11. 【0046】 The pair of second switching modules 12 are arranged, for example, along one longitudinal side of the rectangular first conductor 31 and second conductor 32 together with the pair of first switching modules 11. The pair of first switching modules 11 and the pair of second switching modules 12 are arranged, for example, along one longitudinal side of the rectangular first conductor 31 and second conductor 32, in the order of first switching module 11, second switching module 12, second switching module 12, and first switching module 11. 【0047】 Furthermore, the power converter 10 is provided with two sets each of a pair of first switching modules 11 and a pair of second switching modules 12, which are arranged side by side on both sides of the first conductor 31 and the second conductor 32. The two sets of first switching modules 11 and the two sets of second switching modules 12 are arranged on both sides of the first conductor 31 and the second conductor 32, sandwiching them between them. 【0048】 One of the two pairs of first switching modules 11 and one of the two pairs of second switching modules 12 are arranged side by side with the first conductor 31 and the second conductor 32. One of the two pairs of first switching modules 11 and one of the two pairs of second switching modules 12 are arranged, for example, along one longitudinal side of the rectangular first conductor 31 and the second conductor 32. 【0049】 The other of each of the two pairs of first switching modules 11 and the other of each of the two pairs of second switching modules 12 are arranged side by side opposite to one of the two pairs of first switching modules 11 and one of the two pairs of second switching modules 12, respectively. The other of each of the two pairs of first switching modules 11 and the other of each of the two pairs of second switching modules 12 are arranged, for example, along the other longitudinal side of the rectangular first conductor 31 and second conductor 32. 【0050】 As shown in Figures 2 and 3, each of the pair of first switching modules 11 is positioned such that one end of the first housing 11d, on which the first AC terminal 11c is provided, faces the first conductor 31 and the second conductor 32. Each of the pair of second switching modules 12 is positioned such that one end of the second housing 12d, on which the second AC terminal 12c is provided, faces the first conductor 31 and the second conductor 32. 【0051】 Figure 4 is a schematic diagram illustrating a reference power conversion device. As shown in Figure 4, in the reference power converter 10a, four first switching modules 11 are arranged side by side on one side of the first conductor 31 and the second conductor 32, and four second switching modules 12 are arranged side by side on the other side of the first conductor 31 and the second conductor 32. 【0052】 Furthermore, Figure 4 schematically shows the current flow when the first switching element 21 and the fourth switching element 24 are in the ON state and the second switching element 22 and the third switching element 23 are in the OFF state, indicated by dashed-dotted arrows. 【0053】 When switching is performed as described above, the current output from the high-potential terminal 2a of the DC circuit 2 flows into the AC circuit 4 via the first DC terminal 11a of the first switching module 11, the first switching element 21, the first AC terminal 11c of the first switching module 11, and the first conductor 31. The current that flows through the AC circuit 4 flows to the low-potential terminal 2b of the DC circuit 2 via the second conductor 32, the second AC terminal 12c of the second switching module 12, the fourth switching element 24, and the fourth DC terminal 12b of the second switching module 12. 【0054】 As a result of diligent investigation, the inventors of the present invention have found that, in the configuration of the reference power converter 10a, when switching is performed as described above, there is a possibility that an imbalance in the current flowing through each switching module may occur. More specifically, they have found that current may not flow easily to the two central first switching modules 11 of the four first switching modules 11 arranged in a row, and current may concentrate in the two outer first switching modules 11. Similarly, current may not flow easily to the two central second switching modules 12 of the four second switching modules 12 arranged in a row, and current may concentrate in the two outer second switching modules 12. 【0055】 As shown in Figure 4, in the configuration of the reference power converter 10a, when switching is performed as described above, current flows in the same direction in four adjacent first switching modules 11, and current flows in the same direction in four adjacent second switching modules 12. The above current imbalance is thought to be due to the effect of mutual induction between multiple adjacent first switching modules 11 and multiple adjacent second switching modules 12. 【0056】 In contrast, in the power converter 10 according to this embodiment, a pair of second switching modules 12 are provided side by side with the first conductor 31 and the second conductor 32 together with the pair of first switching modules 11, and the pair of second switching modules 12 are positioned between the pair of first switching modules 11. 【0057】 As a result, in the power converter 10 according to this embodiment, as shown in Figure 3, when switching is performed as described above, the direction of the current flowing through the pair of first switching modules 11 and the direction of the current flowing through the pair of second switching modules 12 can be reversed. This makes it possible to suppress the effects of mutual induction, for example, and prevent an imbalance in the magnitude of the current flowing through the pair of first switching modules 11 and the pair of second switching modules 12. In addition, this makes it possible to suppress the increase in the temperature burden of each switching module, and to reduce the need for measures such as increasing the cooling capacity of each switching module or increasing the number of parallel connections of each switching module. Consequently, it is possible to suppress the increase in size and cost of the device. 【0058】 For example, when arranging a pair of first switching modules 11 and a pair of second switching modules 12 side by side, it is conceivable to arrange them alternately, such as first switching module 11, second switching module 12, first switching module 11, second switching module 12. However, in this case, there will be first switching modules 11 with a second switching module 12 adjacent to only one side, and first switching modules 11 with second switching modules 12 adjacent to both sides, resulting in an imbalance in the mutual induction conditions between the pair of first switching modules 11. Similarly, there will be second switching modules 12 with a first switching module 11 adjacent to only one side, and second switching modules 12 with first switching modules 11 adjacent to both sides, resulting in an imbalance in the mutual induction conditions between the pair of second switching modules 12. 【0059】 In the power converter 10 according to this embodiment, a pair of second switching modules 12 are arranged between a pair of first switching modules 11, so that for each of the pair of first switching modules 11, the second switching module 12 is adjacent to only one side. Furthermore, for each of the pair of second switching modules 12, the other second switching module 12 is adjacent to one side, and the first switching module 11 is adjacent to the opposite side. 【0060】 Therefore, in the power converter 10 according to this embodiment, it is possible to more effectively suppress the bias in the mutual induction conditions in each of the pair of first switching modules 11 and the pair of second switching modules 12, compared to cases such as when they are arranged alternately. It is also possible to more effectively suppress the occurrence of an imbalance in the magnitude of the current flowing through each of the pair of first switching modules 11 and the pair of second switching modules 12. 【0061】 Thus, in the power conversion device 10 according to this embodiment, it is possible to suppress the occurrence of current imbalance between the multiple switching modules, namely the pair of first switching modules 11 and the pair of second switching modules 12. 【0062】 Furthermore, in the power conversion device 10 according to this embodiment, a plate-shaped first conductor 31 and a plate-shaped second conductor 32 are arranged in a stacked configuration. This makes it possible to suppress the influence of the inductance component in the first conductor 31 and the second conductor 32. 【0063】 Furthermore, in the power converter 10 according to this embodiment, two sets of a pair of first switching modules 11 and a pair of second switching modules 12 are provided, and they are arranged side by side on both sides of the first conductor 31 and the second conductor 32. In this way, when two sets of a pair of first switching modules 11 and a pair of second switching modules 12 are provided, they are arranged side by side on both sides of the first conductor 31 and the second conductor 32. 【0064】 This makes it possible to suppress the bias in the mutual induction conditions between each module, compared to, for example, the case where two pairs of first switching modules 11 and two pairs of second switching modules 12 are arranged side by side on one side of the first conductor 31 and the second conductor 32. Even when two sets of each pair of first switching modules 11 and pair of second switching modules 12 are provided, the occurrence of current imbalance between multiple switching modules can be suppressed more effectively. 【0065】 Furthermore, in the power conversion device 10 according to this embodiment, each of the pair of first switching modules 11 is positioned with one end of the first housing 11d, which is provided with the first AC terminal 11c, facing the first conductor 31 and the second conductor 32, and each of the pair of second switching modules 12 is positioned with one end of the second housing 12d, which is provided with the second AC terminal 12c, facing the first conductor 31 and the second conductor 32. 【0066】 This makes it easier to reverse the direction of the current flowing through the pair of first switching modules 11 and the direction of the current flowing through the pair of second switching modules 12. This allows for, for example, more effective suppression of the effects of mutual induction. 【0067】 Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. Furthermore, the embodiments described above can be implemented in combination with each other. [Explanation of symbols] 【0068】 2…DC circuit, 4…AC circuit, 10, 10a…Power converter, 11…First switching module, 12…Second switching module, 21…First switching element, 22…Second switching element, 23…Third switching element, 24…Fourth switching element, 31…First conductor, 32…Second conductor, FBC…Full bridge circuit

Claims

[Claim 1] A power conversion device connected to a DC circuit and an AC circuit, which performs at least one of the conversions from DC power to AC power and from AC power to DC power, A pair of first switching modules having a first switching element and a second switching element connected in series, A pair of second switching modules having a third switching element and a fourth switching element connected in series, A plate-shaped first conductor electrically connected to one of the pair of input / output terminals of the aforementioned AC circuit, A plate-shaped second conductor is electrically connected to the other of the pair of input / output terminals of the AC circuit and is provided overlapping the first conductor at a predetermined distance, Equipped with, Each of the pair of first switching modules is electrically connected to the DC circuit via both ends of the first switching element and the second switching element, and is electrically connected to the first conductor and one of the pair of input / output terminals of the AC circuit via the connection point of the first switching element and the second switching element, thereby connecting them in parallel. Each of the pair of second switching modules is electrically connected to the DC circuit via both ends of the third and fourth switching elements, and is electrically connected to the second conductor and the other of the pair of input / output terminals of the AC circuit via the connection point of the third and fourth switching elements, thereby connecting them in parallel. The pair of first switching modules and the pair of second switching modules constitute a full-bridge circuit with the first switching element, the second switching element, the third switching element, and the fourth switching element performs at least one of the following: conversion from DC power to AC power and conversion from AC power to DC power. The pair of first switching modules are arranged side by side with the first conductor and the second conductor, The pair of second switching modules are provided together with the pair of first switching modules, side by side with the first conductor and the second conductor, and the power conversion device is positioned between the pair of first switching modules. [Claim 2] The power conversion device according to claim 1, wherein two sets of the pair of first switching modules and the pair of second switching modules are provided and arranged side by side on both sides of the first conductor and the second conductor. [Claim 3] Each of the pair of first switching modules includes a first housing for housing the first switching element and the second switching element, a first DC terminal electrically connected to the high-potential terminal of the DC circuit, a second DC terminal electrically connected to the low-potential terminal of the DC circuit, and a first AC terminal electrically connected to the first conductor. The first AC terminal is provided on one end of the first housing, The first DC terminal and the second DC terminal are provided on the other end side of the first housing. Each of the pair of first switching modules is positioned such that one end of the first housing, on which the first AC terminal is provided, faces the first conductor and the second conductor. Each of the pair of second switching modules includes a second housing for housing the third and fourth switching elements, a third DC terminal electrically connected to the high-potential terminal of the DC circuit, a fourth DC terminal electrically connected to the low-potential terminal of the DC circuit, and a second AC terminal electrically connected to the second conductor. The second AC terminal is provided on one end of the second housing, The third DC terminal and the fourth DC terminal are provided on the other end side of the second housing. The power conversion device according to claim 1 or 2, wherein each of the pair of second switching modules is arranged so that one end of the second housing on which the second AC terminal is provided faces the first conductor and the second conductor.

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