Power Conversion Equipment

Abstract

To provide a power conversion device capable of suppressing the size of the device from becoming larger.SOLUTION: A power conversion device 10 includes a first substrate 23 and a second substrate 25 laminated on each other in parallel in a thickness direction. On the first substrate 23, a plurality of switching elements 11 are arranged. A plurality of capacitors 13 connected to the plurality of switching elements 11 are arranged on the second substrate 25. The plurality of switching elements 11 and the plurality of capacitors 13 are arranged so that they are arranged while misaligned on a crossing direction of the thickness direction and they do not overlap each other when viewed from the thickness direction of each of the substrates 23, 25.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Conventionally, for example, a power conversion module is known that includes a first substrate having a switching element mounted thereon, a second substrate having a capacitor mounted thereon, and a resin material filled between the first substrate and the second substrate that are stacked with a predetermined gap between them (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-209685 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned power conversion module, if the first and second substrates are simply arranged at a predetermined interval in the stacking direction, the dimensions of the power conversion module in the stacking direction may increase, and the amount of resin material filled between the first and second substrates may increase. For example, when multiple switching elements of the first substrate and a capacitor of the second substrate overlap in the stacking direction, it becomes necessary to secure a distance of at least a predetermined value between the first substrate and the second substrate to avoid mutual positional interference, which causes a problem that it is not possible to suppress an increase in the size of the device.

[0005] An object of the present invention is to provide a power conversion device that can be prevented from becoming large in size. [Means for solving the problem]

[0006] In order to solve the above problems and achieve the above object, the present invention employs the following aspects. A power conversion device (10) according to one embodiment of the present invention comprises a first substrate (23) having a plurality of switching elements (11), and a second substrate (25) having a plurality of capacitors (13) connected to the plurality of switching elements and stacked in a thickness direction on the first substrate, wherein the plurality of switching elements and the plurality of capacitors are arranged so as to be offset from each other in a direction intersecting the thickness direction and not overlapping each other when viewed from the thickness direction.

[0007] The power conversion device described above may include a plurality of terminal members (31, 33A) connected to the plurality of switching elements, and in each of the plurality of terminal members, a direction parallel to the arrangement of the plurality of switching elements is perpendicular to a direction parallel to the arrangement of the plurality of capacitors, and a direction parallel to the arrangement of the plurality of capacitors is parallel to a direction parallel to the arrangement of the plurality of terminal members.

[0008] The above-described power conversion device may further include a plurality of terminal fixing members (55, 57, 59, 43, 45, 47) that fix the plurality of terminal members to the first board.

[0009] The power conversion device described above may include a housing (21) in which the first substrate is disposed, and the multiple capacitors may be disposed in a space (S) formed between the first substrate and a wall surface of the housing in the intersecting direction. Effect of the Invention

[0010] According to the above, since the multiple switching elements and the multiple capacitors are arranged to be shifted in a direction intersecting the stacking direction of the first substrate and the second substrate, the distance between the first substrate and the second substrate can be reduced compared to, for example, a case where the switching elements and the capacitors are arranged to overlap when viewed from the stacking direction. By suppressing an increase in the distance between the first substrate and the second substrate, an increase in the size of the power conversion device in the stacking direction of the first substrate and the second substrate can be suppressed. In addition, for example, when multiple switching elements and multiple capacitors are arranged side by side in a direction intersecting the stacking direction of the first substrate and the second substrate, an increase in the distance between the multiple switching elements and the multiple capacitors can be suppressed, thereby suppressing an increase in inductance.

[0011] In the above case, since the arrangement direction of the multiple switching elements and the arrangement direction of the multiple capacitors with respect to each terminal member are perpendicular to each other, it is possible to suppress differences in the distance between the multiple switching elements and the multiple capacitors associated with each terminal member compared to, for example, a case in which the arrangement direction of the multiple switching elements and the arrangement direction of the multiple capacitors are parallel, etc. It is possible to suppress an increase in the distance between the multiple switching elements and the multiple capacitors, and to suppress an increase in inductance of the entire device.

[0012] In the above case, since the multiple terminal members are directly fixed to the first substrate by the multiple terminal fixing members, for example, a bus bar connected to the multiple switching elements is not required, and the device configuration can be prevented from becoming complicated or large.

[0013] In the above case, since the capacitors are disposed in the space between the first board and the wall of the housing, the first board and the second board can be disposed close to each other in the thickness direction, which prevents the distance between the switching elements and the capacitors from increasing, and prevents an increase in inductance of the entire device. [Brief description of the drawings]

[0014] [Figure 1] 1 is a perspective view showing a configuration of a power conversion device according to an embodiment of the present invention. [Diagram 2] 1 is an exploded perspective view of a power conversion device according to an embodiment of the present invention; [Diagram 3] 1 is a circuit diagram of a power conversion device according to an embodiment of the present invention. [Figure 4] A cross-sectional view taken along the YZ plane at the position of line AA shown in Figure 1. [Diagram 5] 2 is a cross-sectional view taken along the XZ plane at the position of line BB shown in FIG. 1. [Figure 6] 3A and 3B are diagrams illustrating terminal members of a power conversion device according to an embodiment of the present invention. [Figure 7] 1 is a diagram showing an example of a motorcycle equipped with a power conversion device according to an embodiment of the present invention. [Figure 8] 1 is a cross-sectional view showing the inside of a swing arm of a motorcycle equipped with a power conversion device according to an embodiment of the present invention. [Figure 9] 1 is a perspective view showing the inside of a swing arm of a motorcycle equipped with a power conversion device according to an embodiment of the present invention; [Figure 10] FIG. 13 is a diagram showing an example of a motorcycle equipped with a power conversion device according to a first modified example of an embodiment of the present invention. [Figure 11] FIG. 13 is a diagram showing an example of a motorcycle equipped with a power conversion device according to a second modified example of an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a power conversion device according to an embodiment of the present invention will be described with reference to the accompanying drawings. Fig. 1 is a perspective view showing a configuration of a power conversion device 10 according to an embodiment. Fig. 2 is an exploded perspective view of the power conversion device 10 according to an embodiment. Fig. 3 is a circuit diagram of the power conversion device 10 according to an embodiment. In the following, the X-axis, Y-axis, and Z-axis directions, which are mutually orthogonal in a three-dimensional space, are parallel to each other. For example, as shown in Fig. 1 and Fig. 2, the Z-axis direction is parallel to the thickness direction of the power conversion device 10, the Y-axis direction is parallel to the short side direction of the power conversion device 10, and the X-axis direction is parallel to the longitudinal direction of the power conversion device 10.

[0016] The power conversion device 10 of the embodiment is mounted on a vehicle such as a saddle-ride vehicle. As described later (see, for example, FIG. 7), the saddle-ride vehicle of the embodiment is, for example, an electric motorcycle 1. The electric motorcycle 1 includes a rotating electric machine 5, a battery 7, and the power conversion device 10 that constitute a drive unit 3, as shown in, for example, FIG. The rotating electric machine 5 is used, for example, for driving the vehicle, and generates a rotational driving force by performing a power running operation using electric power supplied from the battery 7 via the power conversion device 10. The rotating electric machine 5 may also generate electric power by performing a regenerative operation using rotational power input to a rotating shaft from the wheel side. The rotating electric machine 5 is, for example, a three-phase AC brushless DC motor. The three phases are U, V, and W. The rotating electric machine 5 includes a rotor having a permanent magnet for a field magnet, and a stator having a three-phase stator winding that generates a rotating magnetic field that rotates the rotor. The battery 7 is, for example, a high-voltage battery that is a power source for a vehicle. The battery 7 includes a battery case and a plurality of battery modules housed in the battery case. The battery module includes a plurality of battery cells connected in series or parallel.

[0017] As shown in FIGS. 1 and 2, a power conversion device 10 includes, for example, a plurality of switching elements 11 and a plurality of capacitors 13 for each of three phases, namely, a U phase, a V phase, and a W phase. Each switching element 11 is, for example, a transistor such as an IGBT (Insulated Gate Bipolar Transistor) or a MOSFET (Metal Oxide Semiconductor Field Effect Transistor). The multiple switching elements 11 are, for example, high-side arm transistors and low-side arm transistors that form six pairs in each phase (i.e., six pairs). The pairs of high-side arm transistors and low-side arm transistors are high-side arm and low-side arm U-phase transistors UH, UL, high-side arm and low-side arm V-phase transistors VH, VL, and high-side arm and low-side arm W-phase transistors WH, WL. Each capacitor 13 is, for example, a capacitor that smoothes voltage fluctuations that occur with the on / off switching operation of each switching element 11. The plurality of capacitors 13 are, for example, ten smoothing capacitors.

[0018] 3, the power conversion device 10 of the embodiment includes, for example, a bridge circuit formed by each of the transistors UH, UL, VH, VL, WH, and WL that are bridge-connected in three phases, and a rectifier element. The rectifier element is a diode D connected in parallel to each of the transistors UH, UL, VH, VL, WH, and WL. The diode D is, for example, a freewheeling diode connected in the forward direction from the emitter to the collector between the collector and emitter of each of the transistors UH, UL, VH, VL, WH, and WL. The collectors of the transistors UH, VH, WH of the high side arm are connected to a positive terminal Pa. The emitters of the transistors UL, VL, WL of the low side arm are connected to a negative terminal Na. In each of the three phases, the emitters of the transistors UH, VH, WH of the high side arm and the collectors of the transistors UL, VL, WL of the low side arm are connected to respective phase terminals Ua, Va, Wa of the three phases. The respective phase terminals Ua, Va, Wa are connected to respective stator windings SU, SV, SW of the three phases of the rotating electric machine 5. Each capacitor 13 is connected between a positive terminal Pa and a negative terminal Na.

[0019] The power conversion device 10 controls the operation of the rotating electric machine 5. The power conversion device 10 switches the transistor pairs of each phase on (conducting) / off (blocking) based on a gate signal, which is a switching command input to the gates of each of the transistors UH, VH, WH, UL, VL, and WL. For example, when the rotating electric machine 5 is powered, the power conversion device 10 converts DC power inputted from the positive electrode terminal Pa and the negative electrode terminal Na into three-phase AC power and supplies it to the rotating electric machine 5. The power conversion device 10 generates a rotational driving force by sequentially commutating the current supplied to the three-phase stator windings SU, SV, and SW of the rotating electric machine 5. For example, during regeneration of the rotating electric machine 5, the power conversion device 10 converts three-phase AC power input from each of the three phase terminals Ua, Va, Wa into DC power by driving the transistor pairs of each phase to be on (conductive) and off (cut-off) in synchronization with the rotation of the rotating electric machine 5. The power conversion device 10 can supply the DC power converted from the three-phase AC power to the battery 7.

[0020] Fig. 4 is a cross-sectional view taken along the YZ plane at the position of line AA shown in Fig. 1. Fig. 5 is a cross-sectional view taken along the XZ plane at the position of line BB shown in Fig. 1. As shown in FIGS. 1, 2, 4 and 5, the power conversion device 10 includes a housing 21, a first board 23 and a second board 25. The housing 21 includes a first substrate 23 and a second substrate 25. The first substrate 23 and the second substrate 25 are electrically connected to each other. 1 and 2, the outer shape of the housing 21 is, for example, a box shape with an opening. Of both ends in the thickness direction (Z-axis direction) of the housing 21, a first end on the positive side in the Z-axis direction has an opening. As shown in Fig. 4, of both ends in the thickness direction (Z-axis direction) of the housing 21, a second end on the negative side in the Z-axis direction has a heat dissipation fin 27. The housing 21 fixes a first substrate 23 arranged inside and a second substrate 25 arranged on the periphery of the opening. The power conversion device 10 includes a resin material R that is filled inside the housing 21. The resin material R is an insulating material, for example, a thermosetting resin having electrical insulation properties.

[0021] The first substrate 23 is disposed, for example, with its thickness direction parallel to the Z-axis direction. The first substrate 23 has a plurality of switching elements 11 on a first surface 23A on the positive side in the Z-axis direction among both surfaces in the thickness direction. A second surface 23B on the back side (negative side in the Z-axis direction) of the first surface 23A among both surfaces in the thickness direction of the first substrate 23 is joined to a base 27a of the fin 27 of the housing 21 via a heat dissipation member 29. The heat dissipation member 29 is, for example, a member formed in a sheet shape from a gel-like material having thermal conductivity, electrical insulation, flexibility, adhesion, and the like.

[0022] 1 and 2, the multiple switching elements 11 are arranged on the first surface 23A of the first substrate 23 such that the multiple transistor pairs of each phase are aligned parallel to a first direction. The first direction is, for example, the Y-axis direction. For example, six pairs of high-side arm and low-side arm U-phase transistors UH, UL, which are six transistor pairs of the U-phase, are aligned in the Y-axis direction. Similarly, six pairs of V-phase transistor pairs (transistors VH, VL) are aligned in the Y-axis direction, and six pairs of W-phase transistor pairs (transistors WH, WL) are aligned in the Y-axis direction. The high-side arm transistor and the low-side arm transistor, which are transistor pairs for each phase, are arranged parallel to each other in a second direction. The second direction is a direction perpendicular to the first direction, for example, the X-axis direction. For example, the high-side arm U-phase transistor UH and the low-side arm U-phase transistor UL are sequentially arranged side by side from the positive side to the negative side in the X-axis direction. Similarly, the high-side arm V-phase transistor VH and the low-side arm V-phase transistor VL are sequentially arranged side by side from the positive side to the negative side in the X-axis direction, and the high-side arm W-phase transistor WH and the low-side arm W-phase transistor WL are sequentially arranged side by side from the positive side to the negative side in the X-axis direction. The three-phase transistor pairs are arranged in parallel in the second direction. For example, the six U-phase transistor pairs (transistors UH, UL), the six V-phase transistor pairs (transistors VH, VL), and the six W-phase transistor pairs (transistors WH, WL) are sequentially arranged in a row from the positive side to the negative side in the X-axis direction.

[0023] The second substrate 25 is disposed so as to be stacked on the first substrate 23 at a predetermined interval in the thickness direction. The second substrate 25 is disposed, for example, with its thickness direction parallel to the Z-axis direction. The second substrate 25 is parallel to the first substrate 23. The second substrate 25 has a plurality of capacitors 13 on a first surface 25A, which is one of both surfaces in the thickness direction and faces the first surface 23A of the first substrate 23. The first surface 25A of the second substrate 25 is the surface on the negative side in the Z-axis direction, among both surfaces in the thickness direction of the second substrate 25. As shown in FIG. 1 and FIG. 2, the plurality of capacitors 13 are arranged in a line in the second direction (for example, the X-axis direction) on the first surface 25A of the second substrate 25. The plurality of capacitors 13 are arranged to be aligned in a line in the first direction (for example, the Y-axis direction) with respect to the plurality of switching elements 11 so as not to overlap with the plurality of switching elements 11 when viewed from the thickness direction (for example, the Z-axis direction) of each substrate 23, 25. The plurality of capacitors 13 are arranged to overlap (wrap) with the plurality of switching elements 11 when viewed from a direction perpendicular to the thickness direction of each substrate 23, 25 (for example, the Y-axis direction). In order to overlap each switching element 11 and each capacitor 13 in the thickness direction (for example, the Z-axis direction) of each substrate 23, 25, a space S for arranging the plurality of capacitors 13 is formed between the first substrate 23 and the wall surface of the housing 21. The space S is formed, for example, by a step provided in the first substrate 23 in the first direction or by arranging the first substrate 23 away from the wall surface of the housing 21 in the first direction.

[0024] The power conversion device 10 includes a plurality of conductive members 31 and a plurality of terminal members 33 fixed to the first substrate 23 and the second substrate 25. The conductive members 31 and the terminal members 33 each have an outer shape, for example, a cylindrical shape having a base for fastening. The conductive members 31 and the terminal members 33 are formed, for example, from a conductive metal. The conductive members 31 and the terminal members 33 are each arranged such that their central axes are parallel to the thickness direction (for example, the Z-axis direction) of the substrates 23, 25. Each of the conductive members 31 is disposed between the first substrate 23 and the second substrate 25, and forms a current path between the first substrate 23 and the second substrate 25. Each terminal member 33 is connected to the first substrate 23 and disposed so as to penetrate the second substrate 25 in the thickness direction, and forms a current path between the first substrate 23 and the AC side cable terminal CA or the DC side cable terminal CD.

[0025] The plurality of conductive members 31 are, for example, three conductive members 31 corresponding to three phases. The three conductive members 31 are, for example, arranged in a row in the second direction between the plurality of switching elements 11 and the plurality of capacitors 13. The conductive members 31 corresponding to each of the three phases are arranged in the vicinity of the switching elements 11 of each phase, for example, at positions adjacent to the switching elements 11 of each phase in the first direction. The conductive members 31 corresponding to each of the three phases are connection terminal members that connect the switching elements 11 of each phase of the first substrate 23 (for example, the collectors of each transistor UH, VH, WH of the high-side arm or the emitters of each transistor UL, VL, WL of the low-side arm) to the capacitors 13 of the second substrate 25, forming a current path between them.

[0026] 4 and 5, each conductive member 31 includes, for example, a columnar portion 31a and a base portion 31b. The columnar portion 31a is fastened and fixed to the second substrate 25 by, for example, a first bolt 41. The base portion 31b is fixed to the first substrate 23 by, for example, a second bolt 47 via a first insulating member 43 and a second insulating member 45. The first insulating member 43 has an outer shape of, for example, a cylinder having a flange portion. The first insulating member 43 is disposed in a bolt insertion hole formed in each of the base portion 31b, the first board 23, and the heat dissipation member 29. The flange portion of the first insulating member 43 is disposed between the seat surface of the base portion 31b and the seat surface of the second bolt 47. The first insulating member 43 insulates electrical conduction between the second bolt 47 and the base portion 31b, the first board 23, and the heat dissipation member 29. The second insulating member 45 has an outer shape of, for example, a cylindrical shape. The second insulating member 45 is disposed outside the first insulating member 43 in a bolt insertion hole formed in each of the first substrate 23 and the heat dissipation member 29. The second insulating member 45 insulates electrical conduction between the second bolt 47 and the first substrate 23 and the heat dissipation member 29. The second bolt 47 is inserted into a bolt insertion hole formed in each of the base portion 31b, the first board 23, and the heat dissipation member 29 via the first insulating member 43 and the second insulating member 45, and is fastened and fixed to the base portion 27a of the fin 27. Since the electrical continuity between the second bolt 47 and the base portion 31b is insulated by the first insulating member 43, the electrical continuity between the fin 27 connected to the second bolt 47 and the conductive member 31 is also insulated.

[0027] As shown in Figures 1 and 2, the multiple terminal members 33 are, for example, three terminal members 33 (first terminal members 33A) corresponding to each of the three phase terminals Ua, Va, and Wa, and two terminal members 33 (second terminal members 33B) corresponding to each of the positive terminal Pa and the negative terminal Na. The three first terminal members 33A are arranged, for example, in a row in the second direction near the switching elements 11 of each phase on the peripheral edge of the first substrate 23. The vicinity of the switching elements 11 of each phase is, for example, a position adjacent to the switching elements 11 of each phase in the first direction and a position on the opposite side of the three conductive members 31 (for example, on the negative side in the Y-axis direction) with respect to the switching elements 11 of each phase in the first direction. The two second terminal members 33B are arranged, for example, in a row in the first direction near the multiple switching elements 11 on the peripheral portion of the first substrate 23. The vicinity of the multiple switching elements 11 is, for example, a position adjacent to the multiple switching elements 11 in the second direction, and a position adjacent to the U-phase switching element 11 on the positive side in the X-axis direction.

[0028] FIG. 6 is a diagram showing a terminal member 33 of the power conversion device 10 in the embodiment. As shown in Figs. 4, 5 and 6, each terminal member 33 includes, for example, a columnar portion 33a and a pedestal portion 33b. The columnar portion 33a penetrates, for example, the second substrate 25 and a support member 51 arranged on the second surface 25B on the back side (positive side in the Z-axis direction) of the first surface 25A among both surfaces in the thickness direction of the second substrate 25, and is fixed to each cable terminal by a third bolt 53. Each cable terminal is, for example, an AC side cable terminal CA of each of the three phases for the first terminal member 33A, and a DC side cable terminal CD of each of the positive and negative electrodes for the second terminal member 33B. The pedestal portion 33b is fixed to the first substrate 23 by a fourth bolt 59 via, for example, a third insulating member 55 and a fourth insulating member 57. The third insulating member 55 has an outer shape of, for example, a cylinder having a flange portion. The third insulating member 55 is disposed in a bolt insertion hole formed in each of the base portion 33b, the first substrate 23, and the heat dissipation member 29. The flange portion of the third insulating member 55 is disposed between the seat surface of the base portion 33b and the seat surface of the fourth bolt 59. The third insulating member 55 insulates electrical conduction between the fourth bolt 59 and the base portion 33b, the first substrate 23, and the heat dissipation member 29. The fourth insulating member 57 has an outer shape of, for example, a cylindrical shape. The fourth insulating member 57 is disposed outside the third insulating member 55 in the bolt insertion holes formed in the first substrate 23 and the heat dissipation member 29. The fourth insulating member 57 insulates electrical conduction between the fourth bolt 59 and the first substrate 23 and the heat dissipation member 29. The fourth bolt 59 is inserted into a bolt insertion hole formed in each of the base portion 33b, the first board 23, and the heat dissipation member 29 via the third insulating member 55 and the fourth insulating member 57, and is fastened and fixed to the base portion 27a of the fin 27. Since the electrical continuity between the fourth bolt 59 and the base portion 33b is insulated by the third insulating member 55, the electrical continuity between the fin 27 connected to the fourth bolt 59 and the terminal member 33 is also insulated.

[0029] When the current of three phases is sequentially commutated with the operation of the power conversion device 10, current flows only through two of the three conductive members 31 and three first terminal members 33A corresponding to any two phases among the three conductive members 31 and three first terminal members 33A corresponding to the three phases. The currents flowing through the two conductive members 31 corresponding to any two phases are in opposite directions, and magnetic fluxes that cancel each other out are generated so that the mutual inductance is negative. The currents flowing through the two first terminal members 33A corresponding to any two phases are in opposite directions, and magnetic fluxes that cancel each other out are generated so that the mutual inductance is negative.

[0030] Fig. 7 is a diagram showing an example of a motorcycle 1 equipped with the power conversion device 10 of the embodiment. Fig. 8 is a cross-sectional view showing the inside of a swing arm 61 of the motorcycle 1 equipped with the power conversion device 10 of the embodiment. Fig. 9 is a perspective view showing the inside of the swing arm 61 of the motorcycle 1 equipped with the power conversion device 10. 7, 8 and 9, the power conversion device 10 of the embodiment is disposed, for example, on a swing arm 61 of the motorcycle 1 integrally with the rotating electric machine 5 and the reduction mechanism 63. The battery 7 which constitutes the drive unit 3 together with the power conversion device 10, the rotating electric machine 5 and the reduction mechanism 63 is disposed, for example, below the seat 65 of the motorcycle 1.

[0031] The swing arm 61 is, for example, a cantilever type having an arm portion only on the left side in the vehicle width direction. The swing arm 61 is a structure formed of a metal such as aluminum with a hollow portion. The swing arm 61 is supported so as to swing with respect to a body frame 77, for example, via a swing shaft 75 penetrating a link 73 attached to a pivot plate 71. The pivot plate 71 is attached to a joint between a main frame 77a and a rear frame 77b that constitute the body frame 77. The rear end of the swing arm 61 is suspended from the rear frame 77b via a rear cushion 79. The swing arm 61 supports a rear wheel WR by an axle connected to a reduction gear mechanism 63. The rotating electric machine 5 and the reduction gear mechanism 63 are disposed at the rear of the swing arm 61. The power conversion device 10 is disposed on the front side of the rotating electric machine 5 on the swing arm 61. The power conversion device 10 is disposed such that the fins 27 of the housing 21 face the hollow interior of the swing arm 61.

[0032] The swing arm 61 has a plurality of openings for introducing and discharging air flowing through the hollow interior, for example, when the motorcycle 1 is traveling. The plurality of openings are, for example, a front opening 81 and a rear opening 83 formed at the front and rear parts, respectively, of the swing arm 61, and an opening 85 formed between the front opening 81 and the rear opening 83. The swing arm 61 has an airflow direction setting member 87 for setting the flow F of air flowing inside to be directed toward the fins 27 of the power conversion device 10.

[0033] As described above, according to the power conversion device 10 of the embodiment, the switching elements 11 and the capacitors 13 are arranged in a shifted manner in a direction perpendicular to the stacking direction of the first substrate 23 and the second substrate 25, which are parallel to each other in the thickness direction, so that the distance between the first substrate 23 and the second substrate 25 can be reduced, compared to the case where the switching elements 11 and the capacitors 13 are arranged so as to overlap when viewed from the stacking direction. By suppressing the increase in the distance between the first substrate 23 and the second substrate 25, the increase in the dimensions of the power conversion device 10 in the stacking direction of the first substrate 23 and the second substrate 25 can be suppressed. As a result, even if an insulating material such as a resin material R is arranged to be filled in the housing 21 including between the first substrate 23 and the second substrate 25, an increase in the amount of insulating material can be suppressed. Furthermore, since the multiple switching elements 11 and the multiple capacitors 13 are arranged side by side in a direction (first direction) perpendicular to the stacking direction of the first substrate 23 and the second substrate 25, an increase in the distance between the multiple switching elements 11 and the multiple capacitors 13 can be suppressed, and an increase in inductance can be suppressed.

[0034] Furthermore, since the multiple capacitors 13 are disposed in the space S formed between the first substrate 23 and the wall surface of the housing 21 in the first direction, the first substrate 23 and the second substrate 25 can be disposed close to each other in the stacking direction. This makes it possible to suppress an increase in the distance between the multiple switching elements 11 and the multiple capacitors 13, and suppress an increase in inductance of the entire device.

[0035] For each of the three phases, the arrangement direction (first direction) of the multiple switching elements 11 and the arrangement direction (second direction) of the multiple capacitors 13 are perpendicular to each other, so that it is possible to suppress differences in the distance between the multiple switching elements 11 and the multiple capacitors 13 associated with each phase, compared to, for example, a case in which the arrangement direction of the multiple switching elements 11 and the arrangement direction of the multiple capacitors 13 are parallel. It is possible to suppress an increase in the distance between the multiple switching elements 11 and the multiple capacitors 13, and to suppress an increase in inductance and an increase in surge voltage of the entire device. It is possible to suppress an increase in the withstand voltage of various elements such as the switching elements 11, and to suppress an increase in the cost required for configuring the device. Since each conductive member 31 and each terminal member 33 is fixed directly to the first substrate 23, for example, a bus bar connected to multiple switching elements 11 is not required, and the device configuration can be prevented from becoming complicated or large.

[0036] The three conductive members 31 and the three first terminal members 33A corresponding to the three phases are arranged in the second direction, so that the currents flowing in any two phases during operation of the power conversion device 10 are in opposite directions, and magnetic fluxes that cancel each other out are generated so that the mutual inductance becomes negative. This cancels out the magnetic fluxes in any two phases through which currents flow, making it possible to suppress an increase in inductance in the entire device. The conductive members 31 and the terminal members 33 (first terminal member 33A, second terminal member 33B) are fixed to the first substrate 23 by bolts 47, 59 fastened to the base 27a of the fin 27 via the insulating members 43, 45, 55, 57. This makes it possible to prevent the tightening torque of the bolts 47, 59 from acting directly on the first substrate 23.

[0037] Since the first substrate 23 is joined to the housing 21 via a flexible heat dissipation member 29, even when the power conversion device 10 is mounted on a vehicle, for example, it is possible to suppress an increase in impact and vibration while ensuring a predetermined heat dissipation performance. The power conversion device 10 fixed to the swing arm 61 is disposed so that the air flow F flowing inside the swing arm 61 due to wind generated during traveling is directed toward the fins 27, thereby improving heat dissipation.

[0038] (Modification) Modifications of the embodiment will be described below. Note that the same parts as those in the above-described embodiment will be denoted by the same reference numerals and descriptions thereof will be omitted or simplified.

[0039] In the above-described embodiment, the power conversion device 10 is arranged on the swing arm 61 of the motorcycle 1, but the present invention is not limited to this. Fig. 10 is a diagram showing an example of a motorcycle 1A equipped with a power conversion device 10 according to a first modified example of the embodiment. Fig. 11 is a diagram showing an example of a motorcycle 1B equipped with a power conversion device 10 according to a second modified example of the embodiment. As shown in FIG. 10, a power converter 10 according to a first modified example is disposed at the rear of a rear frame 77b of a motorcycle 1A. As shown in FIG. 11, a power converter 10 according to the second modified example is disposed under a main frame 77a of a motorcycle 1B.

[0040] The embodiments of the present invention are presented as examples and are not intended to limit the scope of the invention. These 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 modifications are included in the scope of the invention and its equivalents as described in the claims, as well as the scope and spirit of the invention. [Explanation of symbols]

[0041] Reference Signs List 1, 1A, 1B...motorcycle, 5...rotating electric machine, 7...battery, 10...power conversion device, 11...switching element, 13...capacitor, 21...housing, 23...first board, 25...second board, 31...conductive member (terminal member), 33...terminal member, 43...first insulating member (terminal fixing member), 45...second insulating member (terminal fixing member), 47...second bolt (terminal fixing member), 55...third insulating member (terminal fixing member), 57...fourth insulating member (terminal fixing member), 59...fourth bolt (terminal fixing member), 61...swing arm, 77a...main frame, 77b...rear frame.

Claims

1. A first substrate (23) having a plurality of switching elements (11); a second substrate (25) having a plurality of capacitors (13) connected to the plurality of switching elements and stacked on the first substrate in a thickness direction, the second substrate (25) being stacked at intervals within a housing (21) via a conductive member (31) that forms a current path between the first substrate (23) and the second substrate (25); The plurality of capacitors (13) are disposed in a space (S) formed between a wall surface of the housing (21) and the first substrate (23), and overlap with the first substrate (23) when viewed in a direction perpendicular to the stacking direction of the first substrate (23) and the second substrate (25). A power conversion device comprising:

2. A plurality of terminal members (31, 33A) connected to the plurality of switching elements, In each of the plurality of terminal members, a direction parallel to the arrangement of the plurality of switching elements is perpendicular to a direction parallel to the arrangement of the plurality of capacitors, A direction parallel to the arrangement of the plurality of capacitors and a direction parallel to the arrangement of the plurality of terminal members are parallel to each other.

2. The power conversion device according to claim 1 .

3. The first substrate is provided with a plurality of terminal fixing members (55, 57, 59, 43, 45, 47) for fixing the plurality of terminal members to the first substrate.

3. The power conversion device according to claim 2.

4. The plurality of capacitors (13) are arranged in a row on a first surface (25A) side, which is one surface of the second substrate (25); The conductive member (31) is disposed between the first substrate (23) and the second substrate (25) near the plurality of capacitors, a first terminal member (33A) that connects the plurality of switching elements to an AC side cable terminal (CA) that outputs power from the power conversion device is disposed on the opposite side of the conductive member (31) between the first substrate (23) and the second substrate (25) with the plurality of switching elements interposed therebetween; The AC side cable terminal (CA) is connected to the first terminal member (33A) on the second surface (25B) side, which is the back side of the first surface (25A) of the second substrate. The power conversion device according to any one of claims 1 to 3.

5. A power conversion device as described in Claim 4, characterized in that a DC side cable terminal (CD) through which DC power is conducted to the power conversion device is arranged on the second surface (25B) side of the second substrate (25) near the multiple capacitors (13).

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