Power converter

Abstract

The present invention provides a power conversion device that can suppress an increase in the dimensions of the first mounting member and the second mounting member in the direction in which they extend. [Solution] In this power conversion device 100, the chopper section 20 includes a first chopper section 21 attached to a first mounting member 50, and a second chopper section 22 attached to a second mounting member 60 such that at least a portion of it overlaps with the first chopper section 21 when viewed from the direction in which the first mounting member 50 and the second mounting member 60 face each other.

Description

Technical Field

[0001] The present invention relates to a power conversion device, and more particularly to a power conversion device including a converter section, an inverter section, and a chopper section.

Background Art

[0002] Conventionally, a power conversion device including a converter section, an inverter section, and a chopper section has been known (see, for example, Patent Document 1).

[0003] Patent Document 1 discloses a power conversion device including a pair of bases, fins provided between the pair of bases, a converter section, an inverter section, and a chopper section. The converter section, the inverter section, and the chopper section are configured to be cooled by dissipating heat to the fins. Each of the converter section, the inverter section, and the chopper section is disposed on either one of the pair of bases.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the power conversion device described in Patent Document 1, there may be a space in the pair of bases where none of the converter section, the inverter section, and the chopper section is disposed. In that case, the dimensions of the power conversion device in the direction in which the pair of bases (the first mounting member and the second mounting member) extend become large. Therefore, a power conversion device capable of suppressing an increase in the dimensions in the direction in which the first mounting member and the second mounting member extend is desired.

[0006] This invention was made to solve the above-mentioned problems, and one object of this invention is to provide a power conversion device that can suppress an increase in the dimensions of the first mounting member and the second mounting member in the direction in which they extend. [Means for solving the problem]

[0007] To achieve the above objective, a power conversion device according to one aspect of the present invention comprises: a converter unit that converts AC power supplied from an AC power source into DC power; a chopper unit that transforms DC power supplied from a rechargeable and discharging energy storage device; an inverter unit that converts the DC power converted by the converter unit and the DC power transformed by the chopper unit into AC power; a flat plate-shaped first mounting member to which the inverter unit is attached; a flat plate-shaped second mounting member that faces the first mounting member from the side opposite to the inverter unit, and to which the converter unit is attached on the side opposite to the side facing the first mounting member; and heat dissipation fins provided between the first mounting member and the second mounting member for heat dissipation by cooling air, wherein the chopper unit includes a first chopper unit attached to the first mounting member and a second chopper unit attached to the second mounting member such that at least a portion of it overlaps with the first chopper unit when viewed from the opposing direction in which the first mounting member and the second mounting member face each other.

[0008] In a power conversion device according to one aspect of this invention, as described above, the chopper section includes a first chopper section attached to a first mounting member and a second chopper section attached to a second mounting member such that at least a portion of it overlaps with the first chopper section when viewed from the opposing direction in which the first and second mounting members face each other. By arranging the first chopper section in the space on the first mounting member where the inverter section is not located, and arranging the second chopper section in the space on the second mounting member where the converter section is not located, it is possible to suppress the increase in the amount of space on the first and second mounting members where none of the converter section, inverter section, or chopper section are located. As a result, it is possible to suppress the increase in the dimensions of the first and second mounting members in the direction in which they extend. Furthermore, by overlapping at least a portion of the first chopper section and the second chopper section when viewed from the opposite direction, the first chopper section and the second chopper section can be positioned closer together compared to the case where they do not overlap. This prevents the connection members from becoming longer and complicating the device configuration when the first chopper section and the second chopper section are electrically connected by connecting members such as wiring or busbars.

[0009] In the power conversion device according to the first aspect described above, preferably, the heat dissipation fins are formed in a grid pattern when viewed from the direction in which the cooling air flows. With this configuration, the grid-shaped heat dissipation fins can increase the contact area with the cooling air compared to comb-shaped heat dissipation fins that extend in only one direction, thereby improving the cooling efficiency. In addition, compared to comb-shaped heat dissipation fins that extend in only one direction, the grid-shaped heat dissipation fins can support each other with their intersecting fins, thereby improving the mechanical strength of the heat dissipation fins.

[0010] In the power conversion device according to the first aspect described above, preferably, at least one of the inverter section, converter section, and chopper section includes a plurality of element modules, each having a switching element, which are arranged on a first mounting member or a second mounting member at predetermined intervals when viewed from the direction in which the cooling air flows, and the width of the heat dissipation fins along the opposing direction is greater than the predetermined interval. With this configuration, at least one of the inverter section, converter section, and chopper section can be effectively cooled by heat dissipation fins with a relatively large width along the opposing direction.

[0011] In the power conversion device according to the first aspect described above, preferably, the length of the first mounting member and the second mounting member in the vertical direction, as viewed from the direction in which the cooling air flows, is greater than the width of the heat dissipation fins in the opposing direction. With this configuration, a large mounting space can be secured for the first mounting member and the second mounting member, so that more heat-generating elements can be cooled at once.

[0012] In the power conversion device according to the first aspect described above, preferably, the first chopper section and the second chopper section overlap overall when viewed from the opposing direction. With this configuration, the overall dimensions of the device in the direction in which the first mounting member and the second mounting member extend can be reduced compared to the case where the first chopper section and the second chopper section partially overlap when viewed from the opposing direction. As a result, it is possible to suppress an increase in the size of the power conversion device in the direction in which the first mounting member and the second mounting member extend.

[0013] In the power conversion device according to the first aspect described above, preferably, the inverter section and the converter section overlap overall when viewed from opposite directions. With this configuration, the overall dimensions of the device in the direction in which the first mounting member and the second mounting member extend can be reduced compared to the case where the inverter section and the converter section partially overlap when viewed from opposite directions. As a result, it is possible to suppress an increase in the size of the power conversion device in the direction in which the first mounting member and the second mounting member extend.

[0014] In the power conversion device according to the first aspect described above, preferably, a balancer unit is further provided to stabilize the neutral point voltage of the DC power input to the inverter unit, and the balancer unit is attached to a first mounting member so as to be horizontally adjacent to the element modules constituting the first chopper unit, or to a second mounting member so as to be horizontally adjacent to the element modules constituting the second chopper unit. With this configuration, even when a balancer unit is arranged in addition to the inverter unit, converter unit, and chopper unit, the balancer unit can be arranged so as to be horizontally adjacent to the element modules constituting the chopper unit, thereby effectively utilizing dead space and suppressing an increase in the vertical dimension of the entire device. [Effects of the Invention]

[0015] According to the present invention, as described above, it is possible to suppress the increase in the dimensions of the first mounting member and the second mounting member in the direction in which they extend. [Brief explanation of the drawing]

[0016] [Figure 1] This is an electrical circuit diagram of a power converter according to one embodiment of the present invention. [Figure 2] This is a view of a power conversion device according to one embodiment of the present invention, as seen from the direction in which the cooling air flows. [Figure 3] This is a magnified view of a portion of Figure 2. [Figure 4] This is a view from the first mounting member side showing how cooling air passes through a power conversion device according to one embodiment of the present invention. [Figure 5] This is a view from the second mounting member side showing how cooling air passes through a power conversion device according to one embodiment of the present invention. [Modes for carrying out the invention]

[0017] Hereinafter, an embodiment of the present invention will be described based on the drawings.

[0018] (Configuration of Power Conversion Device) Referring to FIGS. 1 to 5, the configuration of the power conversion device 100 according to the present embodiment will be described.

[0019] As shown in FIG. 1, the power conversion device 100 is a device that converts the power supplied from an AC power source 101 or a power storage device 102 such as a battery and supplies it to the load 103.

[0020] As shown in FIGS. 1 and 2, the power conversion device 100 includes a converter section 10, a chopper section 20, an inverter section 30, a balancer section 40, a first mounting member 50, a second mounting member 60, and a heat radiation fin 70. In FIG. 2, the left-right direction of the power conversion device 100 is defined as the X direction, one side in the X direction is defined as the X1 direction, and the other side is defined as the X2 direction. Also, the up-down direction of the power conversion device 100 is defined as the Z direction, the upward direction is defined as the Z1 direction, and the downward direction is defined as the Z2 direction. Further, the direction orthogonal to the X direction and the Z direction is defined as the Y direction, one side in the Y direction is defined as the Y1 direction, and the other side is defined as the Y2 direction. In the present embodiment, as an example, the Z direction is defined as the up-down direction, but the X direction or the Y direction may be the up-down direction.

[0021] As shown in FIG. 1, the converter section 10 has a function of converting the AC power supplied from an external AC power source 101 into DC power. The DC power converted by the converter section 10 is output to the inverter section 30.

[0022] As shown in FIG. 1, the chopper section 20 has a function of transforming the DC power supplied from an external power storage device 102 capable of charging and discharging. Specifically, the chopper section 20 is configured to boost the DC power supplied from the power storage device 102. The DC power boosted by the chopper section 20 is output to the inverter section 30. As shown in FIG. 2, the chopper section 20 includes a first chopper section 21 attached to the first mounting member 50 and a second chopper section 22 attached to the second mounting member 60.

[0023] As shown in Figure 1, the inverter unit 30 has the function of converting the input DC power into AC power. The AC power output from the inverter unit 30 is output to the external load 103.

[0024] The balancer unit 40 is positioned in the electrical circuit between the converter unit 10 and the chopper unit 20 and the inverter unit 30. The balancer unit 40 has the function of stabilizing the neutral point voltage of the DC power input to the inverter unit 30. Each of the converter unit 10, the chopper unit 20, the inverter unit 30, and the balancer unit 40 has multiple element modules, including switching elements such as IGBTs (Insulated Gate Bipolar Transistors).

[0025] Specifically, as shown in Figures 2 and 5, the converter section 10 includes six element modules 11. Also, as shown in Figures 2, 4, and 5, the chopper section 20 includes a total of six element modules: three element modules 21a attached to the first mounting member 50 and three element modules 22a attached to the second mounting member 60. Note that element modules 21a and 22a have similar structures. Also, as shown in Figures 2 and 4, the inverter section 30 includes six element modules 31. Also, as shown in Figures 2 and 4, the balancer section 40 includes one element module 41.

[0026] The converter unit 10, chopper unit 20, inverter unit 30, and balancer unit 40 are configured to perform power conversion by switching internal switching elements via a control unit (not shown).

[0027] As shown in Figures 2 and 4, the first mounting member 50 is a flat plate-shaped member that extends in the vertical direction (Z direction). The first chopper section 21, the inverter section 30, and the balancer section 40 are attached to the first mounting member 50. Specifically, as shown in Figure 4, the first mounting member 50 is attached to three element modules 21a included in the first chopper section 21, six element modules 31 included in the inverter section 30, and one element module 41 included in the balancer section 40. Since the inverter section 30 has a higher cooling priority compared to the first chopper section 21, if the cooling efficiency differs depending on the location on the first mounting member 50, it is preferable to mount the inverter section 30 in a location on the first mounting member 50 where the cooling efficiency is higher. In this embodiment, the inverter section 30 is mounted on the first mounting member 50 below the first chopper section 21 (on the Z2 side).

[0028] Furthermore, as shown in Figure 4, the balancer unit 40 (element module 41) is mounted on the first mounting member 50 so as to be adjacent horizontally (in this embodiment, in the Y direction) to the element module 21a constituting the first chopper unit 21 within the rectangular arrangement area 21b where the first chopper unit 21 is located. Specifically, the element module 41 of the balancer unit 40 is mounted on the first mounting member 50 so as to be adjacent horizontally (Y direction) and vertically (Z direction) to the element module 21a of the first chopper unit 21. In other words, the element module 41 of the balancer unit 40 is located in the dead space of the area where the first chopper unit 21 is mounted.

[0029] As shown in Figures 2 and 5, the second mounting member 60 is a flat plate-shaped member that extends in the vertical direction (Z direction). As shown in Figure 2, the second mounting member 60 is positioned opposite the first mounting member 50 from the side opposite the inverter unit 30. The second chopper unit 22 and the converter unit 10 are attached to the second mounting member 60 on the side opposite to the side facing the first mounting member 50 (X1 side). Specifically, as shown in Figure 5, the three element modules 22a included in the second chopper unit 22 and the six element modules 11 included in the converter unit 10 are attached to the second mounting member 60. Since the converter unit 10 has a higher cooling priority compared to the second chopper unit 22, if the cooling efficiency differs depending on the location on the second mounting member 60, it is preferable to attach the converter unit 10 to a location on the second mounting member 60 where the cooling efficiency is higher. In this embodiment, the converter unit 10 is mounted on the second mounting member 60 below the second chopper unit 22 (on the Z2 side).

[0030] As shown in Figures 2, 4, and 5, the first chopper section 21 and the second chopper section 22 overlap in at least a portion when viewed from the direction (X direction) in which the first mounting member 50 and the second mounting member 60 face each other. In this embodiment, the three element modules 21a of the first chopper section 21 and the three element modules 22a of the second chopper section 22 face each other. In other words, the first chopper section 21 and the second chopper section 22 overlap overall when viewed from the direction (X direction) in which the first mounting member 50 and the second mounting member 60 face each other. Accordingly, in this embodiment, the chopper section 20 includes the first chopper section 21 attached to the first mounting member 50 and the second chopper section 22 attached to the second mounting member 60 so as to overlap the first chopper section 21 overall when viewed from the direction in which the first mounting member 50 and the second mounting member 60 face each other. The direction in which the first mounting member 50 and the second mounting member 60 face each other is an example of the "facing direction" in the claims.

[0031] Furthermore, as shown in Figures 2, 4, and 5, the inverter unit 30 and the converter unit 10 overlap in at least a portion when viewed from the direction (X direction) in which the first mounting member 50 and the second mounting member 60 face each other. In this embodiment, the six element modules 31 of the inverter unit 30 and the six element modules 11 of the converter unit 10 each face each other. In other words, the inverter unit 30 and the converter unit 10 overlap overall when viewed from the direction (X direction) in which the first mounting member 50 and the second mounting member 60 face each other.

[0032] As shown in Figure 2, the heat dissipation fins 70 are provided between the first mounting member 50 and the second mounting member 60. The heat dissipation fins 70 are configured to dissipate heat generated from the converter unit 10, chopper unit 20, inverter unit 30, and balancer unit 40 to the cooling air 104 shown in Figures 4 and 5. As a result, the converter unit 10, chopper unit 20, inverter unit 30, and balancer unit 40 are configured to be cooled by the cooling air 104.

[0033] As shown in Figure 2, the heat dissipation fin 70 is connected to the first mounting member 50 and the second mounting member 60. The connection between the heat dissipation fin 70 and the first mounting member 50, and the connection between the heat dissipation fin 70 and the second mounting member 60 can be achieved, for example, by crimping, welding, bonding, and bolting. The heat dissipation fin 70, the first mounting member 50, and the second mounting member 60 may be integrally formed.

[0034] As shown in Figures 4 and 5, the power converter 100 is configured such that an external fan 105 drives cooling air 104 to flow along the direction in which the heat dissipation fins 70 extend (Y direction) from one side to the other of the heat dissipation fins 70 (see Figure 2). The cooling air 104 that has passed through the heat dissipation fins 70 rises so as to be drawn into the fan 105 located on the upper side (Z1 side) of the power converter 100.

[0035] As shown in Figures 2 and 3, the heat dissipation fins 70 are formed in a grid pattern when viewed from the direction in which the cooling air 104 (see Figure 4) flows (Y direction). Specifically, as shown in Figure 3, the heat dissipation fins 70 are formed in a grid pattern by including a horizontal fin portion 70a extending in the direction in which the first mounting member 50 and the second mounting member 60 face each other (X direction) and a vertical fin portion 70b extending in a direction perpendicular to the direction in which the horizontal fin portion 70a extends (Z direction), when viewed from the direction in which the cooling air 104 (see Figure 4) flows (Y direction).

[0036] As shown in Figure 2, at least one (all in this embodiment) of the inverter section 30, converter section 10, and chopper section 20 includes a plurality of element modules (in this embodiment, element modules 11, 21a, 22a, and 31) each having a switching element, which are arranged on the first mounting member 50 or second mounting member 60 at predetermined spacing D when viewed from the direction in which the cooling air 104 flows (X direction). Furthermore, the width W of the heat dissipation fin 70 along the direction in which the first mounting member 50 and the second mounting member 60 face each other (X direction) is greater than the predetermined spacing D. Specifically, as shown in Figure 2, when viewed from the direction in which the cooling air 104 flows (Y direction), the element module 21a of the first chopper section 21 and the element module 31 of the inverter section 30 are arranged along the vertical direction (Z direction) at predetermined spacing D on the first mounting member 50. Furthermore, viewed from the direction of airflow (Y direction) of the cooling air 104, the element modules 22a of the second chopper section 22 and the element modules 11 of the converter section 10 are arranged vertically (Z direction) on the second mounting member 60 at predetermined spacing D intervals. The width W of the heat dissipation fins 70 along the direction (X direction) in which the first mounting member 50 and the second mounting member 60 face each other is greater than the predetermined spacing D.

[0037] Furthermore, in this embodiment, as shown in Figure 2, the length L of the first mounting member 50 and the second mounting member 60 along the vertical direction (Z direction), when viewed from the direction in which the cooling air 104 (see Figure 4) flows (Y direction), is greater than the width W of the heat dissipation fin 70 along the direction in which the first mounting member 50 and the second mounting member 60 face each other (X direction).

[0038] As shown in Figure 2, a pair of L-shaped fixing members 51 are provided at the upper and lower ends of the first mounting member 50. Similarly, a pair of L-shaped fixing members 61 are provided at the upper and lower ends of the second mounting member 60. The power converter 100 is configured to be fixed by inserting fastening members such as bolts into holes provided in the pair of fixing members 51 and the pair of fixing members 61 and fastening them to the outside. As shown in Figure 2, the power converter 100 is configured so that the first mounting member 50 and the second mounting member 60 are fixed by at least one of the pair of fixing members 51 and the pair of fixing members 61 so that they extend along the vertical direction (Z direction). Note that the pair of fixing members 51 and the pair of fixing members 61 are not shown in Figures 4 and 5.

[0039] (Effects of the embodiment) Next, the effects of this embodiment will be described.

[0040] In this embodiment, as described above, the chopper section 20 includes a first chopper section 21 attached to the first mounting member 50, and a second chopper section 22 attached to the second mounting member 60 such that at least a portion of it overlaps with the first chopper section 21 when viewed from the direction in which the first mounting member 50 and the second mounting member 60 face each other. By arranging the first chopper section 21 in the space on the first mounting member 50 where the inverter section 30 is not located, and arranging the second chopper section 22 in the space on the second mounting member 60 where the converter section 10 is not located, it is possible to suppress the increase in the amount of space on the first mounting member 50 and the second mounting member 60 where none of the converter section 10, inverter section 30, or chopper section 20 are located. As a result, it is possible to suppress the increase in the dimensions of the first mounting member 50 and the second mounting member 60 in the direction in which they extend. Furthermore, by overlapping at least a portion of the first chopper section 21 and the second chopper section 22 when viewed from the direction in which the first mounting member 50 and the second mounting member 60 face each other, the first chopper section 21 and the second chopper section 22 can be positioned closer together compared to the case where they do not overlap. This prevents the connection members from becoming longer and complicating the device configuration when the first chopper section 21 and the second chopper section 22 are electrically connected by connecting members such as wiring or busbars.

[0041] Furthermore, in this embodiment, as described above, the heat dissipation fins 70 are formed in a grid pattern when viewed from the direction in which the cooling air 104 flows. As a result, the grid-shaped heat dissipation fins 70 can increase the contact area with the cooling air 104 compared to comb-shaped heat dissipation fins that extend in only one direction, thereby improving cooling efficiency. In addition, compared to comb-shaped heat dissipation fins that extend in only one direction, the grid-shaped heat dissipation fins 70 can support each other with their intersecting fin sections (horizontal fin section 70a and vertical fin section 70b), thereby improving the mechanical strength of the heat dissipation fins 70.

[0042] Furthermore, in this embodiment, as described above, the inverter unit 30, the converter unit 10, and the chopper unit 20 include a plurality of element modules (11, 21a, 22a, and 31) each having a switching element, which are arranged on the first mounting member 50 and the second mounting member 60 at predetermined spacing D when viewed from the direction in which the cooling air 104 flows. The width W of the heat dissipation fin 70 along the direction in which the first mounting member 50 and the second mounting member 60 face each other is greater than the predetermined spacing D. As a result, the heat dissipation fin 70, with its relatively large width W along the direction in which the first mounting member 50 and the second mounting member 60 face each other, can effectively cool the inverter unit 30, the converter unit 10, and the chopper unit 20.

[0043] Furthermore, in this embodiment, as described above, the length L of the first mounting member 50 and the second mounting member 60 in the vertical direction, when viewed from the direction in which the cooling air 104 flows, is greater than the width W of the heat dissipation fin 70 in the direction in which the first mounting member 50 and the second mounting member 60 face each other. This allows for a larger mounting space for the first mounting member 50 and the second mounting member 60, enabling the cooling of more heat-generating elements at once.

[0044] Furthermore, in this embodiment, as described above, the first chopper section 21 and the second chopper section 22 completely overlap when viewed from the direction in which the first mounting member 50 and the second mounting member 60 face each other. As a result, the overall dimensions of the device in the direction in which the first mounting member 50 and the second mounting member 60 extend can be reduced compared to the case where the first chopper section 21 and the second chopper section 22 partially overlap when viewed from the direction in which the first mounting member 50 and the second mounting member 60 face each other. Consequently, it is possible to suppress an increase in the size of the power converter 100 in the direction in which the first mounting member 50 and the second mounting member 60 extend (Z direction).

[0045] Furthermore, in this embodiment, as described above, the inverter unit 30 and the converter unit 10 completely overlap when viewed from the direction in which the first mounting member 50 and the second mounting member 60 face each other. As a result, the overall dimensions of the device in the direction in which the first mounting member 50 and the second mounting member 60 extend can be reduced compared to the case in which the inverter unit 30 and the converter unit 10 partially overlap when viewed from the direction in which the first mounting member 50 and the second mounting member 60 face each other. Consequently, it is possible to suppress an increase in the size of the power conversion device 100 in the direction in which the first mounting member 50 and the second mounting member 60 extend (Z direction).

[0046] Furthermore, in this embodiment, as described above, a balancer unit 40 is further provided to stabilize the neutral point voltage of the DC power input to the inverter unit 30, and the balancer unit 40 is attached to the first mounting member 50 so as to be horizontally adjacent to the element module 21a constituting the first chopper unit 21. As a result, even when the balancer unit 40 is arranged in addition to the inverter unit 30, converter unit 10 and chopper unit 20, the balancer unit 40 can be arranged so as to be horizontally adjacent to the element module 21a constituting the first chopper unit 21, thereby effectively utilizing dead space and suppressing an increase in the vertical dimension of the entire device.

[0047] [Differentiation] It should be noted that the embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims rather than by the description of the embodiments above, and further includes all modifications (exceptions) within the meaning and scope equivalent to the claims.

[0048] In the above embodiment, an example was shown in which the converter unit 10 includes six element modules 11, the chopper unit 20 includes six element modules 21a and 22a, the inverter unit 30 includes six element modules 31, and the balancer unit 40 includes one element module 41. However, the present invention is not limited to this. In the present invention, the number of element modules included in the converter unit may be 1 to 5 or 7 or more. The number of element modules included in the chopper unit may be 1 to 5 or 7 or more. The number of element modules included in the inverter unit may be 1 to 5 or 7 or more. The number of element modules included in the balancer unit may be 2 or more.

[0049] Furthermore, although the above embodiment shows an example in which the balancer unit 40 (element module 41) is attached to the first mounting member 50, the present invention is not limited to this. In the present invention, the balancer unit may be attached to the second mounting member. In that case, the balancer unit should be attached to the second mounting member so as to be horizontally adjacent to the element modules constituting the second chopper unit within the rectangular arrangement area where the second chopper unit is located.

[0050] Furthermore, although the above embodiment shows an example in which the heat dissipation fins 70 are formed in a grid shape, the present invention is not limited to this. In the present invention, the heat dissipation fins may be formed in a comb shape that extends in only one direction.

[0051] Furthermore, although the above embodiment shows an example where the width W of the heat dissipation fin 70 is greater than the vertical spacing D of the element modules, the present invention is not limited to this. In the present invention, the width of the heat dissipation fin may be smaller than the vertical spacing of the element modules. [Explanation of Symbols]

[0052] 10 Converter section 11-element module 20 Choppa Club 21. First Chopper Section 21a Element Module 21b Placement area 22. Second Chopper Section 22a Component Module 30 Inverter section 31-element module 40 Balancer section 41-element module 50 First mounting member 60 Second mounting member 70 heat dissipation fins 100 Power converter 101 AC power supply 102 Energy storage device 103 load 104 Cooling air D Placement interval W width L Length

Claims

1. A converter unit that converts AC power supplied from an AC power source into DC power, A chopper section that transforms DC power supplied from a rechargeable and dischargeable energy storage device, An inverter unit that converts the DC power converted by the converter unit and the DC power transformed by the chopper unit into AC power, A flat plate-shaped first mounting member to which the inverter unit is attached, A flat plate-shaped second mounting member is positioned opposite the first mounting member from the side opposite to the inverter section, and the converter section is attached to the side opposite to the side facing the first mounting member, The system includes a heat dissipation fin provided between the first mounting member and the second mounting member, which dissipates heat by cooling air, The chopper portion includes a first chopper portion attached to the first mounting member and a second chopper portion attached to the second mounting member such that at least a portion of it overlaps with the first chopper portion when viewed from the opposing direction in which the first mounting member and the second mounting member face each other.

2. The power conversion device according to claim 1, wherein the heat dissipation fins are formed in a grid pattern when viewed from the direction in which the cooling air flows.

3. At least one of the inverter section, the converter section, and the chopper section includes a plurality of element modules, each having a switching element, which are arranged on the first mounting member or the second mounting member at predetermined intervals when viewed from the direction in which the cooling air flows. The power conversion device according to claim 1, wherein the width of the heat dissipation fins along the opposing direction is greater than the predetermined arrangement interval.

4. The power conversion device according to claim 1, wherein, viewed from the direction in which the cooling air flows, the length of the first mounting member and the second mounting member in the vertical direction is greater than the width of the heat dissipation fin in the opposing direction.

5. The power conversion device according to claim 1, wherein the first chopper section and the second chopper section overlap overall when viewed from the opposing direction.

6. The power conversion device according to claim 1, wherein the inverter section and the converter section overlap overall when viewed from the opposing direction.

7. The inverter section further comprises a balancer section for stabilizing the neutral point voltage of the DC power input to the inverter section. The power conversion device according to claim 1, wherein the balancer section is attached to the first mounting member so as to be horizontally adjacent to the element module constituting the first chopper section, or is attached to the second mounting member so as to be horizontally adjacent to the element module constituting the second chopper section.

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