JP7403598B2 - power converter - Google Patents

Description

The present application relates to a power conversion device.

BACKGROUND ART Electric vehicles that use a motor as a drive source, such as a hybrid vehicle or an electric vehicle, are equipped with a plurality of power conversion devices. A power conversion device is a device that converts input current from direct current to alternating current, alternating current to direct current, or input voltage to a different voltage. Specifically, power conversion devices installed in electrified vehicles include chargers that convert commercial AC power to DC power and charge the high-voltage battery, and convert the DC power of the high-voltage battery to DC power of a different voltage. Examples include a DC/DC converter, an inverter that converts DC power from a high-voltage battery into AC power for a motor, and the like.

A DC/DC converter includes, for example, a transformer having a primary coil and a secondary coil, an electronic component that rectifies a voltage induced in the secondary coil of the transformer, and a choke connected to the secondary coil of the transformer. Equipped with a coil. In in-vehicle devices that are becoming increasingly electrified, the number of power converters is increasing and the power of the power converters is increasing. 2. Description of the Related Art In order to efficiently transmit power converted by a coil or the like, a method of connecting components using bus bars has come to be frequently used in power conversion devices that generate large amounts of power.

For the purpose of expanding the interior space of a vehicle, improving fuel efficiency and electricity consumption, and reducing costs, there is a demand for downsizing of the power converters used in the above-mentioned electric vehicles and the parts installed in the power converters. Among the components mounted on a power conversion device, for example, when a coil and a bus bar are downsized, loss increases, and the loss density also increases, resulting in high temperatures. Therefore, by providing a cooling structure to actively cool the coils and busbars to lower their temperatures, the coils and busbars can be made smaller.

As a specific cooling structure, a cooling structure is disclosed in which a part of the bus bar is expanded for cooling and connected to the cooler via an insulating sheet, etc., thereby dissipating the heat of the bus bar to the cooler ( For example, see Patent Document 1).

Japanese Patent Application Publication No. 2020-22239

In Patent Document 1, the enlarged portion of the bus bar is thermally connected to the cooler, so that the heat of the bus bar can be radiated to the cooler. However, since the cooling structure is such that a part of the bus bar is enlarged and the enlarged part is used to radiate heat from the bus bar to a cooler, there is a problem that the bus bar becomes large. Moreover, since the busbar becomes larger, there is a problem in that the cost of the busbar increases.

Therefore, an object of the present application is to obtain a power conversion device that is compact and has a low-cost cooling structure while maintaining the function of dissipating heat generated by the bus bar.

The power conversion device disclosed in the present application has a plurality of bus bars, and at least two bus bars overlap each other to fasten electrically connected connection parts, and are thermally connected to the connection parts, and have thermal conductivity. a first fastening member, a cooler having a cooling surface facing a plurality of bus bars, an insulating member provided between the cooling surface and the bus bars and having thermal conductivity and electrical insulation, and a magnetic core. The first fastening member has a first extending portion that extends in the direction of the cooler from the connecting portion and is thermally connected to the cooling surface via the insulating member, and the magnetic core includes: The bus bar has a core extension part that extends in a direction away from the cooling surface, the bus bar has a coil part that curves around the core extension part along the cooling surface, and the magnetic core has a core extension part that extends away from the cooling surface. The non-connected part of the bus bar other than the connected part has a protruding part that is bent and protruded in the direction of the cooler from the part separated from the cooler, and the protruding part is connected to the bus bar through the insulating member. , a second fastening member that is thermally connected to the cooling surface, thermally or electrically connects the electronic component to a non-connected part other than the connected part of the bus bar, and has thermal conductivity; The second fastening member extends in the direction of the cooler beyond the unconnected portion to which the second fastening member is connected, and is thermally connected to the cooling surface via the insulating member. It has a second extending portion .

According to the power conversion device disclosed in the present application, the plurality of busbars and at least two busbars overlap each other to fasten the electrically connected connection portions, and are thermally connected to the connection portions to improve thermal conductivity. a cooler having a cooling surface facing the plurality of bus bars; an insulating member provided between the cooling surface and the bus bars and having thermal conductivity and electrical insulation; The first fastening member has a first extending portion that extends in the direction of the cooler from the connecting portion and is thermally connected to the cooling surface via the insulating member, and has a core extension part which is a part extending in a direction away from the cooling surface, the bus bar has a coil part curved around the core extension part along the cooling surface, and the magnetic core is Since it is thermally connected to the cooling surface, the first extension part is thermally connected to the cooling surface through the insulating member, so that the first extension part is thermally connected to the cooling surface through the insulating member. Heat generated by multiple bus bars can be radiated to the cooler while ensuring insulation. In addition, since the ends of the plurality of bus bars fastened by the first fastening member have the same width as the other parts of the bus bars, there is no need to increase the width of the bus bars at the connection part, so the heat generated in the bus bars can be reduced. It is possible to obtain a power converter device that is compact and has a low-cost cooling structure while maintaining the function of radiating heat. Further, since the magnetic core is thermally connected to the cooling surface, the heat generated in the magnetic core and the coil portion can be easily radiated to the cooler.

1 is a perspective view schematically showing a power conversion device according to Embodiment 1. FIG. 2 is a cross-sectional view schematically showing the power converter taken along the line AA in FIG. 1. FIG. 1 is a perspective view schematically showing main parts of a power conversion device according to Embodiment 1. FIG. FIG. 2 is a cross-sectional view schematically showing main parts of another power conversion device according to Embodiment 1. FIG. FIG. 2 is a cross-sectional view schematically showing main parts of another power conversion device according to Embodiment 1. FIG. FIG. 2 is a cross-sectional view schematically showing main parts of another power conversion device according to Embodiment 1. FIG. FIG. 3 is a cross-sectional view showing the main parts of another power conversion device according to the first embodiment. FIG. 3 is a cross-sectional view schematically showing main parts of a power conversion device according to a second embodiment. FIG. 3 is a cross-sectional view schematically showing the main parts of another power conversion device according to Embodiment 2. FIG. FIG. 3 is a cross-sectional view schematically showing the main parts of another power conversion device according to Embodiment 2. FIG. FIG. 3 is a cross-sectional view schematically showing a power conversion device according to a third embodiment. FIG. 7 is a diagram schematically showing a circuit of a power conversion device according to a fourth embodiment. FIG. 7 is a perspective view schematically showing main parts of a power conversion device according to a fourth embodiment. FIG. 7 is a perspective view schematically showing main parts of a power conversion device according to a fourth embodiment. FIG. 7 is a perspective view schematically showing a magnetic core of another power conversion device according to Embodiment 4. FIG.

Hereinafter, a power conversion device according to an embodiment of the present application will be described based on the drawings. In each figure, the same or equivalent members and parts will be described with the same reference numerals.

Embodiment 1.
FIG. 1 is a perspective view schematically showing a power converter 1 according to Embodiment 1, and is a portion that connects electrical components included in the power converter 1. 2 is a cross-sectional view schematically showing the power converter 1 cut along the AA cross-sectional position in FIG. 1, and FIG. 3 is a perspective view schematically showing the main parts of the power converter 1. It is a diagram in which the container 5 is omitted. The power converter 1 is a device that converts input current from direct current to alternating current, alternating current to direct current, or input voltage to a different voltage.

<Power converter 1>
The power conversion device 1 includes a plurality of bus bars, a first fastening member 21 , a second fastening member 22 , a fixing member 23 , an insulating member 4 , a cooler 5 , and an electronic component 7 . The power conversion device 1 includes a resin member 6 in which one or more of a plurality of bus bars, a first fastening member 21, and a second fastening member 22 are integrally molded. In this embodiment, power conversion device 1 includes busbars 11 and 12 as a plurality of busbars. Further, in this embodiment, the bus bar 12, the first fastening member 21, the second fastening member 22, and the fastening portions 21a, 22a, and 23a of the fixing member 23 are integrally molded from the resin member 6. By integrally molding the resin member 6, the positions of the bus bar 12, the first fastening member 21, the second fastening member 22, and the fixing member 23 are determined. Furthermore, the positions of the bus bar 11 connected to the bus bar 12 and the electronic component 7 connected to the bus bar 11 are determined.

The heat radiation path by the first fastening member 21 will be explained. As shown in FIG. 2, the first fastening member 21 fastens the connecting portion 30 in which the ends of the bus bars 11 and 12 overlap each other and are electrically connected, and is also thermally connected to the connecting portion 30. The first fastening member 21 has thermal conductivity. The number of bus bars may be at least two. The number of bus bars is not limited to two, and three bus bars may be overlapped and electrically connected portions may be fastened by the first fastening member 21. The width of the end portions of the bus bars 11 and 12 fastened by the first fastening member 21 is the same as the width of the other portions of the bus bars 11 and 12. Cooler 5 has a cooling surface 5a facing bus bars 11 and 12. In FIG. 2, the direction perpendicular to the cooling surface 5a is the Z direction, and the direction in which the cooling surface 5a is formed is the XY direction. The insulating member 4 is provided between the cooling surface 5a and the bus bars 11 and 12, and has thermal conductivity and electrical insulation. The first fastening member 21 extends further toward the cooler 5 than the connecting portion 30 and has a first extending portion 21a1 that is thermally connected to the cooling surface 5a via the insulating member 4. .

With this configuration, the first extending portion 21a1 of the first fastening member 21 that fastens the bus bars 11 and 12 is thermally connected to the cooling surface 5a of the cooler 5 via the insulating member 4. Therefore, the heat generated in the bus bars 11, 12 can be radiated to the cooler 5 while ensuring insulation between the bus bars 11, 12 and the cooler 5. Since the ends of the bus bars 11 and 12 that are fastened by the first fastening member 21 have the same width as the other parts of the bus bars 11 and 12, there is no need to increase the width of the bus bars 11 and 12 in the connecting portion 30. , it is possible to obtain a power conversion device 1 that is small and has a low-cost cooling structure while maintaining the function of radiating heat generated by the bus bars 11 and 12.

The details of each part will be explained. The bus bars 11 and 12 are made of, for example, copper or aluminum, which have high electrical conductivity. The bus bars 11 and 12 are made of sheet metal, which is obtained by punching out a flat metal plate with a certain thickness using a press die or the like. The bus bar 12 is manufactured by further bending a sheet metal. The method for manufacturing the bus bars 11 and 12 is not limited to punching with a press die, but the bus bars 11 and 12 may also be manufactured by subjecting a flat metal plate to laser processing, etching, or the like. By using these manufacturing methods, bus bars 11 and 12 can be easily manufactured.

The first fastening member 21 includes a fastening portion 21a in which a screw hole is formed and a screw 21b. A portion of the fastening portion 21a on the cooling surface 5a side is the first extending portion 21a1. The second fastening member 22 includes a fastening portion 22a in which a screw hole is formed and a screw 22b. The fixing member 23 includes a cylindrical fastening portion 23a integrally molded with the resin member 6 and a screw 23b. A screw hole 5b is formed in the cooler 5, and the resin member 6 is fixed to the cooling surface 5a by a fixing member 23. The first fastening member 21, the second fastening member 22, and the fixing member 23 are made of metal such as iron or stainless steel, for example.

The resin member 6 is made of a resin material with excellent insulation properties, such as PBT (polybutylene terephthalate), by injection molding, for example. By injection molding the resin member 6, the bus bar 12, the first fastening member 21, the second fastening member 22, and the fastening portions 21a, 22a, and 23a of the fixing member 23 are easily integrated. By fixing the integrated molded product to the cooler 5, the bus bar 12 and the fastening parts 21a, 22a, and 23a can be easily fixed to the cooler 5. By fixing the molded product to the cooler 5, the manufacturing process of fixing a plurality of members such as the bus bar 12 to the cooler 5 is simplified, so the productivity of the power converter 1 can be improved. Since the productivity of the power conversion device 1 is improved, the manufacturing cost of the power conversion device 1 can be reduced.

The cooler 5 is made, for example, by die-casting from aluminum. Fins may be provided on the surface of the cooler 5 opposite to the cooling surface 5a. Alternatively, a flow path through which the refrigerant flows may be provided. The cooling surface 5a has at least two recesses 5c, and the resin member 6 has at least two protrusions 6a. In this embodiment, the cooling surface 5a has two recesses 5c, and the resin member 6 has two protrusions 6a. The two recesses 5c of the cooling surface 5a and the two protrusions 6a of the resin member 6 fit into each other, so that the cooler 5 and the resin member 6 are positioned in the XY direction. The configuration for positioning the cooler 5 and the resin member 6 is not limited to this, and the configuration shown in FIG. 7 may be used. FIG. 7 is a sectional view showing a main part of another power conversion device 1 according to the first embodiment. The cooling surface 5a has two protrusions 5d, and the resin member 6 has two recesses 6b. In FIG. 7, only one protrusion 5d and one recess 6b that fits therein are shown. The two protrusions 5d of the cooling surface 5a and the two recesses 6b of the resin member 6 fit into each other, so that the cooler 5 and the resin member 6 are positioned in the XY direction. With this configuration, the cooler 5 and the resin member 6 can be easily positioned in the XY directions. Since the positioning can be performed easily, the process of assembling the resin member 6 to the cooler 5 becomes easy, and the productivity of the power converter 1 can be improved.

The insulating member 4 is made of a heat dissipating sheet or the like having excellent thermal conductivity and electrical insulation. The insulating member 4 has a function of radiating heat from the bus bars 11, 12 to the cooler 5 while ensuring insulation between the bus bars 11, 12 and the cooler 5. The insulating member 4 may be made of a material capable of being deformed in the thickness direction, such as silicone rubber. When the insulating member 4 is deformable in the thickness direction, variations in the dimensional tolerance of the first fastening member 21 and the second fastening member 22 in the Z direction can be absorbed by the deformation of the insulating member 4. In addition, when the insulating member 4 is deformable in the thickness direction, when molding a molded product in which the bus bar 12, the first fastening member 21, the second fastening member 22, and a part of the fixing member 23 are integrated, Variations in dimensional tolerances in the Z direction that occur can be absorbed by deforming the insulating member 4.

When the resin member 6 is formed by integrally molding at least the first fastening member 21 and the second fastening member 22, as shown in FIG. 2, the first fastening member 21 and the second fastening member 22 are integrally molded. may be configured such that it protrudes from the resin member 6 toward the cooler 5 and is thermally connected to the cooling surface 5a via the insulating member 4. With this configuration, the first fastening member 21 and the second fastening member 22 can be reliably thermally connected to the cooling surface 5a. Since the first fastening member 21 and the second fastening member 22 can be reliably thermally connected to the cooling surface 5a, the heat generated by the bus bars 11 and 12 can be reliably radiated to the cooler 5. Note that the first fastening member 21 and the second fastening member 22 that are integrally molded are not limited to the structure in which they protrude from the resin member 6 toward the cooler 5 side. The surfaces of the member 22 and the resin member 6 on the cooler 5 side may be at the same height in the Z direction. Even if the surfaces of the first fastening member 21, the second fastening member 22, and the resin member 6 on the cooler 5 side are at the same height, the integrated molded product presses the insulating member 4. Since the first fastening member 21 and the second fastening member 22 are fixed to the cooler 5, the cooling surface 5a can be thermally connected to the first fastening member 21 and the second fastening member 22.

<Second fastening member 22>
The power conversion device 1 in this embodiment includes a heat radiation path by the second fastening member 22 in addition to the heat radiation path by the first fastening member 21 . The power conversion device 1 includes a second fastening member 22 that thermally or electrically connects the electronic component 7 to a non-connected portion of the bus bar 11 other than the connected portion 30 . The second fastening member 22 has thermal conductivity. In this embodiment, the electronic component 7 is, for example, a temperature sensor. The temperature sensor is thermally connected to the bus bar 11. The temperature sensor measures the temperature of the bus bar 11 when the power conversion device 1 is operating. The electronic component 7 is not limited to a temperature sensor, and may be a component electrically connected to the bus bar 11, such as a diode. The second fastening member 22 extends toward the cooler 5 beyond the unconnected portion to which the second fastening member 22 is connected, and is thermally connected to the cooling surface 5a via the insulating member 4. It has a second extending portion 22a1. The width of the portion of the bus bar 11 that thermally or electrically connects the electronic component 7 with the second fastening member 22 is the same as the width of the other portion of the bus bar 11. When the fastening portion 22a of the second fastening member 22 is integrated with the resin member 6 as in this embodiment, the bus bar 11 is fixed to the resin member 6 by the second fastening member 22.

With this configuration, the second extending portion 22a1 of the second fastening member 22 that connects the electronic component 7 to the bus bar 11 is thermally connected to the cooling surface 5a of the cooler 5 via the insulating member 4. Therefore, the heat generated in the bus bar 11 can be radiated to the cooler 5 while ensuring insulation between the bus bar 11 and the cooler 5. Since the width of the part of the bus bar 11 to which the electronic component 7 is connected by the second fastening member 22 is the same as the width of the other part of the bus bar 11, there is no need to increase the width of the bus bar 11. It is possible to obtain a power conversion device 1 that is small and has a low-cost cooling structure while maintaining the function of radiating heat. By providing a heat dissipation path by the second fastening member 22 on the bus bar 11 provided at a position farther from the cooler 5 than the bus bar 12, the heat generated in the bus bar 11 provided at a location where heat is difficult to dissipate is efficiently cooled. Heat can be radiated to the container 5.

<Busbar 12>
The power conversion device 1 in this embodiment includes a heat radiation path formed by the protruding portion 12a of the bus bar 12 in addition to the heat radiation path formed by the first fastening member 21 and the second fastening member 22. The non-connected portion of the bus bar 12 other than the connected portion 30 has a protruding portion 12a that is bent and protruded in the direction of the cooler 5 from a portion spaced apart from the cooler 5. The protrusion 12a is thermally connected to the cooling surface 5a via the insulating member 4. The protruding portion 12a is provided between the connecting portion 30 and the end portion 12b opposite to the connecting portion 30. The width of the protruding portion 12a of the bus bar 12 is the same as the width of the other portion of the bus bar 12, as shown in FIG. The height of the protrusion 12a on the cooler 5 side in the Z direction is the same as the height of the first fastening member 21 and the second fastening member 22 on the cooler 5 side.

With this configuration, the protruding portion 12a of the bus bar 12 is thermally connected to the cooling surface 5a of the cooler 5 via the insulating member 4, so while ensuring insulation between the bus bar 12 and the cooler 5, Heat generated by the bus bar 12 can be radiated to the cooler 5. Since the width of the protruding portion 12a of the bus bar 12 is the same as the width of the other portion of the bus bar 12, there is no need to increase the width of the bus bar 12, so the function of dissipating heat generated by the bus bar 12 is maintained. At the same time, it is possible to obtain a power conversion device 1 that is small in size and has a low-cost cooling structure.

In the present embodiment, the bus bar 12 is integrally molded with the resin member 6, but the bus bar 12 having the protruding portion 12a may not be integrally molded with the resin member 6. When the resin member 6 is integrally molded with at least the bus bar 12, as shown in FIG. It has a molded bus bar protrusion 12a1 that is bent and protruded in the direction of. The molded bus bar protrusion 12a1 protrudes from the resin member 6 toward the cooler 5 and is thermally connected to the cooling surface 5a via the insulating member 4. With this configuration, the molded bus bar protrusion 12a1 and the cooling surface 5a can be reliably thermally connected. Since the molded busbar protrusion 12a1 and the cooling surface 5a can be reliably thermally connected, the heat generated in the busbar 12 can be easily radiated to the cooler 5. Note that the structure is not limited to the structure in which the molded bus bar protrusion 12a1 of the integrally molded bus bar 12 protrudes from the resin member 6 toward the cooler 5 side, and the molded bus bar protrusion 12a1 and the resin member 6 on the cooler 5 side The surfaces may have the same height in the Z direction. Even if the molded bus bar protrusion 12a1 and the surface of the resin member 6 on the cooler 5 side are at the same height, the integrated molded product presses the insulating member 4 and is fixed to the cooler 5. Therefore, the molded bus bar protrusion 12a1 and the cooling surface 5a can be thermally connected.

The power conversion device 1 according to the present embodiment can include a heat radiation path formed by the first fastening member 21, the second fastening member 22, and the protruding portion 12a of the bus bar 12. In this way, when the power conversion device 1 has a plurality of heat radiation paths, the heat of the bus bars 11 and 12 can be efficiently radiated. Since the heat of the bus bars 11 and 12 can be efficiently radiated, the cross-sectional area of the bus bars 11 and 12 can be reduced. Since the cross-sectional area of the bus bars 11 and 12 can be reduced, the cost of the bus bars 11 and 12 can be reduced.

<Modification 1>
A modification of this embodiment will be described. In the present embodiment shown in FIG. 2, the bus bar 12, the first fastening member 21, the second fastening member 22, and the fastening portions 21a, 22a, and 23a of the fixing member 23 are integrally molded with the resin member 6. However, the structure is not limited to one in which all of these members are integrally molded, and the structure shown in FIG. 4 may be used. FIG. 4 is a cross-sectional view schematically showing main parts of another power conversion device 1 according to the first embodiment. In the power conversion device 1 shown in FIG. 4 , the bus bar 12 and the fastening portions 21 a and 22 a of the first fastening member 21 and the second fastening member 22 are not integrally molded with the resin member 6 . The fastening portion 21a and the bus bar 12 are connected by welding or the like. The fastening portion 22a and the bus bar 11 are connected by welding or the like. One or both of the bus bar 11 and the bus bar 12 is fixed to the resin member 6 by adhesive or the like. By fixing the resin member 6 to the cooler 5, the busbar 11, the busbar 12, the first fastening member 21, and the second fastening member 22 are fixed to the cooler 5.

With this configuration, the bus bar 12 that is not integrally molded with the resin member 6 and the fastening portions 21a and 22a of the first fastening member 21 and the second fastening member 22 that are not integrally molded with the resin member 6 can be connected to the power converter 1. It can be used for. Since the bus bar 12 and the fastening parts 21a and 22a are not integrally molded, when a problem occurs in these members, only the member in which the problem occurs can be easily replaced. Further, in the present embodiment shown in FIG. 2, the bus bar 11 is not integrally molded with the resin member 6, but a configuration in which the bus bar 11 is integrally molded with the resin member 6 may be used. When the bus bar 11 is integrally molded from the resin member 6, the work of assembling the bus bar 11 to the cooler 5 is simplified, so that the productivity of the power conversion device 1 can be improved. Since the productivity of the power conversion device 1 is improved, the manufacturing cost of the power conversion device 1 can be reduced.

<Modification 2>
In the present embodiment shown in FIG. 2, the protruding portion of the bus bar is provided only on the bus bar 12, but the bus bar provided with the protruding portion is not limited to the bus bar 12, and may have the configuration shown in FIG. 5 or 6. I do not care. 5 and 6 are cross-sectional views schematically showing main parts of another power conversion device 1 according to the first embodiment. In the power conversion device 1 shown in FIG. 5, the bus bar 12 has a protrusion 12a, and the bus bar 11 has a protrusion 11a. In the power conversion device 1 shown in FIG. 6, the bus bar 12 does not have a protrusion, and the bus bar 11 has a protrusion 11a. With this configuration, the protruding portion 11a of the bus bar 11 is thermally connected to the cooling surface 5a of the cooler 5 via the insulating member 4, thereby ensuring insulation between the bus bar 11 and the cooler 5, Heat generated by the bus bar 11 can be radiated to the cooler 5. Since the heat of the bus bar 11 can be radiated more efficiently, the cross-sectional area of the bus bar 11 can be reduced. Since the cross-sectional area of the bus bar 11 can be reduced, the cost of the bus bar 11 can be reduced.

As described above, in the power conversion device 1 according to the first embodiment, the bus bars 11 and 12 overlap the bus bars 11 and 12 to fasten the electrically connected connection portion 30, and also thermally connect the connection portion 30. A first fastening member 21 connected and having thermal conductivity, a cooler 5 having a cooling surface 5a facing the bus bars 11 and 12, and provided between the cooling surface 5a and the bus bars 11 and 12, The first fastening member 21 extends in the direction of the cooler 5 from the connecting portion 30 and connects to the cooling surface 5a via the insulating member 4. Since the first extending portion 21a1 is thermally connected, the first extending portion 21a1 is thermally connected to the cooling surface 5a via the insulating member 4, so that the bus bars 11, 12 and the cooling The heat generated by the bus bars 11 and 12 can be radiated to the cooler 5 while ensuring the insulation of the device 5. Furthermore, since the ends of the bus bars 11 and 12 that are fastened by the first fastening member 21 have the same width as the other parts of the bus bars 11 and 12, it is necessary to increase the width of the bus bars 11 and 12 in the connection part 30. Therefore, it is possible to obtain the power converter 1 having a small and low-cost cooling structure while maintaining the function of dissipating the heat generated by the bus bars 11 and 12.

A non-connected part of the bus bar 12 other than the connected part 30 has a protrusion part 12a that is bent and protruded in the direction of the cooler 5 from a part separated from the cooler 5, and the protrusion part 12a is connected to the cooling surface through the insulating member 4. 5a, the protrusion 12a of the bus bar 12 is thermally connected to the cooling surface 5a of the cooler 5 via the insulating member 4, ensuring insulation between the bus bar 12 and the cooler 5. At the same time, the heat generated by the bus bar 12 can be radiated to the cooler 5. Furthermore, since the width of the protruding portion 12a of the bus bar 12 is the same as the width of the other portion of the bus bar 12, there is no need to increase the width of the bus bar 12. It is possible to obtain a power conversion device 1 having a small-sized and low-cost cooling structure while maintaining the same.

A second fastening member 22 that thermally or electrically connects the electronic component 7 to a non-connected portion of the bus bar 11 other than the connected portion 30 and has thermal conductivity is provided. The second fastening member 22 extends toward the cooler 5 beyond the unconnected portion to which the second fastening member 22 is connected, and is thermally connected to the cooling surface 5a via the insulating member 4. When the second extending portion 22a1 is provided, the second extending portion 22a1 is thermally connected to the cooling surface 5a of the cooler 5 via the insulating member 4, thereby ensuring insulation between the bus bar 11 and the cooler 5. At the same time, the heat generated by the bus bar 11 can be radiated to the cooler 5. Further, since the width of the portion of the bus bar 11 to which the electronic component 7 is connected by the second fastening member 22 is the same as the width of the other portion of the bus bar 11, there is no need to increase the width of the bus bar 11. It is possible to obtain a power conversion device 1 that is small and has a low-cost cooling structure while maintaining the function of dissipating the heat generated.

If the resin member 6 is provided with one or more of the bus bars 11, 12, the first fastening member 21, and the second fastening member 22 integrally molded, and the resin member 6 is fixed to the cooling surface 5a, the individual members Instead, an integrated molded product can be fixed to the cooler 5, so the molded member can be easily fixed to the cooler 5. By fixing the molded product to the cooler 5, the manufacturing process for fixing each member to the cooler 5 is simplified, so that the productivity of the power conversion device 1 can be improved. Since the productivity of the power conversion device 1 is improved, the manufacturing cost of the power conversion device 1 can be reduced.

The cooling surface 5a has at least two recesses 5c, the resin member 6 has at least two protrusions 6a, and the at least two recesses 5c of the cooling surface 5a and the at least two protrusions 6a of the resin member 6, When the cooler 5 and the resin member 6 are positioned in the XY directions by fitting into each other, the cooler 5 and the resin member 6 can be easily positioned in the XY directions.

The resin member 6 integrally molds at least a first fastening member 21 and a second fastening member 22, and the integrally molded first fastening member 21 and second fastening member 22 are connected from the resin member 6 to the cooler 5. , and is thermally connected to the cooling surface 5a via the insulating member 4, the first fastening member 21 and the second fastening member 22 are reliably thermally connected to the cooling surface 5a. be able to. Further, the resin member 6 is configured such that at least the bus bar 12 is integrally molded, and a non-connected portion of the integrally molded bus bar 12 other than the connected portion 30 is bent and protruded in the direction of the cooler 5 from a portion spaced apart from the cooler 5. If the molded bus bar protrusion 12a1 has a molded bus bar protrusion 12a1 that protrudes from the resin member 6 toward the cooler 5 and is thermally connected to the cooling surface 5a via the insulating member 4, the molded bus bar protrusion The portion 12a1 and the cooling surface 5a can be reliably thermally connected.

Embodiment 2.
A power conversion device 1 according to a second embodiment will be described. FIG. 8 is a cross-sectional view schematically showing the main parts of the power converter 1 according to the second embodiment, and is a cross-sectional view of the main parts of the power converter 1 taken at the same position as the AA cross-sectional position in FIG. be. Although the first embodiment includes the second fastening member 22 that fixes the electronic component 7 and the bus bar 11, the power conversion device 1 according to the second embodiment includes the third fastening member 24 that fixes only the bus bar 11. The structure is as follows.

The power conversion device 1 includes a third fastening member 24 that has a portion integrally molded with the resin member 6 and has thermal conductivity. The third fastening member 24 includes a fastening portion 24a in which a screw hole is formed and a screw 24b. The fastening portion 24a is integrally molded with the resin member 6. A non-molded bus bar, which is a bus bar 11 that is not integrally molded with the resin member 6, is fixed to the resin member 6 by a third fastening member 24. The fastening portion 24a of the third fastening member 24 extends in the direction of the cooler 5 beyond the part of the non-molded bus bar to which the third fastening member 24 is connected, and the part exposed from the resin member 6 is connected to the insulating member 4. It has a third extending portion 24a1 that is thermally connected to the cooling surface 5a via. A portion of the fastening portion 24a on the cooling surface 5a side is the third extending portion 24a1. The width of the portion of the bus bar 11 connected to the third fastening member 24 is the same as the width of the other portion of the bus bar 11.

As described above, in the power conversion device 1 according to the second embodiment, the third extending portion 24a1 is thermally connected to the cooling surface 5a of the cooler 5 via the insulating member 4, so that the bus bar 11 and the cooling Heat generated in the bus bar 11 can be radiated to the cooler 5 while ensuring insulation of the device 5. Since the width of the part of the bus bar 11 connected to the third fastening member 24 is the same as the width of the other part of the bus bar 11, there is no need to increase the width of the bus bar 11, so that the heat generated in the bus bar 11 can be absorbed. It is possible to obtain a power conversion device 1 that is small and has a low-cost cooling structure while maintaining the function of radiating heat.

In the present embodiment shown in FIG. 8, the third fastening member 24 is provided only on the bus bar 11; however, the bus bar on which the third fastening member 24 is provided is not limited to the bus bar 11; The configuration shown may be used. 9 and 10 are cross-sectional views schematically showing main parts of another power converter 1 according to the second embodiment, and are cross-sectional views of the power converter 1 cut at a position equivalent to the AA cross-sectional position in FIG. FIG. 3 is a cross-sectional view of main parts. The power conversion device 1 shown in FIG. 9 has a third fastening member 25 to which the bus bar 12 is fixed, and a third fastening member 24 to which the bus bar 11 is fixed. The third fastening member 25 includes a fastening portion 25a in which a screw hole is formed and a screw 25b. The fastening portion 25a is integrally molded with the resin member 6. A portion of the fastening portion 25a on the cooling surface 5a side is the third extending portion 25a1. The power conversion device 1 shown in FIG. 10 has only the third fastening member 25 to which the bus bar 12 is fixed, and does not have a third fastening member to which the bus bar 11 is fixed.

With this configuration, the third extending portion 25a1 is thermally connected to the cooling surface 5a of the cooler 5 via the insulating member 4, thereby ensuring insulation between the bus bar 12 and the cooler 5. , the heat generated by the bus bar 12 can be further radiated to the cooler 5. Since the heat generated by the bus bar 12 can be further radiated to the cooler 5, the cross-sectional area of the bus bar 12 can be reduced. Since the cross-sectional area of the bus bar 12 can be reduced, the cost of the bus bar 12 can be reduced.

Embodiment 3.
A power conversion device 1 according to a third embodiment will be described. FIG. 11 is a cross-sectional view schematically showing the power converter 1 according to the third embodiment, and is a cross-sectional view of the power converter 1 taken at a position equivalent to the AA cross-sectional position in FIG. The power conversion device 1 according to the third embodiment has a configuration in which the bus bar 12 and the resin member 6 are positioned in the XY directions.

A non-molded bus bar, which is a bus bar 12 that is not integrally molded with the resin member 6, has at least two recesses 12c, and the resin member 6 has at least two protrusions 6c. In this embodiment, the bus bar 12 has two recesses 12c, and the resin member 6 has two protrusions 6c. The two recesses 12c of the bus bar 12 and the two protrusions 6c of the resin member 6 fit into each other, so that the bus bar 12 and the resin member 6 are positioned in the XY direction. Note that the shape of the recess 12c may be a through hole. When the shape of the recess 12c is a through hole, the protrusion 6c may be formed with a height that penetrates the bus bar 12.

The configuration for positioning the bus bar 12 and the resin member 6 is not limited to this, and a non-molded bus bar that is a bus bar that is not integrally molded with the resin member 6 has at least two protrusions, and the resin member 6 has at least two protrusions. A structure having two recesses may also be used. At least two protrusions of the non-molded bus bar and at least two recesses of the resin member 6 fit into each other, and the bus bar and the resin member 6 are positioned in the XY direction.

As described above, in the power conversion device 1 according to the third embodiment, the bus bar 12 and the resin member 6 are positioned in the XY direction by the recess and the protrusion, so the positioning of the bus bar 12 and the resin member 6 in the XY direction is facilitated. can be done. Since the positioning of the bus bar 12 and the resin member 6 in the XY directions can be easily performed, the process of assembling the bus bar 12 to the resin member 6 is facilitated, so that the productivity of the power converter 1 can be improved. Since the productivity of the power conversion device 1 is improved, the manufacturing cost of the power conversion device 1 can be reduced.

Embodiment 4.
A power conversion device 1 according to Embodiment 4 will be described. 12 is a diagram schematically showing the circuit of the power converter 1 according to the fourth embodiment, FIG. 13 is a perspective view schematically showing the main parts of the power converter 1, and FIG. 14 is a schematic diagram of the main parts of the power converter 1. It is a perspective view showing the resin member 6 and a part of the transformer core 81 and reactor core 91 removed. The power conversion device 1 according to the fourth embodiment includes a transformer 8 and a reactor 9, and has a configuration in which bus bars 11 and 12 have coil parts 13 and 14.

The power converter 1 includes a transformer 8, a reactor 9, a plurality of diodes 100, and a capacitor 110, as shown in FIG. FIG. 13 shows the structure of the transformer 8 and reactor 9 shown in FIG. 12 and the connecting portion of the transformer 8 and reactor 9, and other members are omitted. The transformer 8 and reactor 9 are magnetic components.

<Trans 8>
The transformer 8 includes a transformer core 81 that is a magnetic core and a coil portion 13 . The transformer core 81 has an annular outer circumferential core and a columnar central core 81a that connects two opposing portions of the outer circumferential core. The central core 81a is a portion of the transformer core 81 that extends in a direction away from the cooling surface 5a, and is a core extension portion. The transformer core 81 is made of a magnetic material such as ferrite. In this embodiment, a transformer core 81 having a closed magnetic circuit structure is formed by overlapping two E-shaped split cores 81b and 81c in the Z direction. The configuration of the transformer core 81 is not limited to the two split cores 81b and 81c formed in an E shape, and may be the configuration shown in FIG. 15. FIG. 15 is a perspective view schematically showing a transformer core 81 of another power conversion device 1 according to the fourth embodiment. A transformer core 81 having a closed magnetic path structure is formed by overlapping two divided cores 81d and 81e formed in an E type and an I type in the Z direction. The transformer core 81 is thermally connected to the cooling surface 5a.

The bus bar 11 has a coil portion 13 that is curved around the central core 81a along the cooling surface 5a and wound around the central core 81a. The bus bar 11 and the coil portion 13 are made of the same material and are integrated. The busbar 11 and the coil portion 13 included in the busbar 11 are collectively referred to as a busbar coil 15. The busbar coil 15 is integrally molded with the resin member 61 with the busbar 11 portion exposed. The resin member 61 is fixed to the cooler 5 by a fixing member 231. By fixing the resin member 61 to the cooler 5, the split core 81c is positioned in the XY direction and fixed to the cooler 5. The split core 81b is pressed by a pressing member (not shown) such as a spring, positioned in the Z direction, and fixed to the cooler 5.

With this configuration, since the transformer core 81 is thermally connected to the cooling surface 5a, the heat generated in the transformer 8 can be easily radiated to the cooler 5. Further, since the transformer 8 is formed from the transformer core 81 and the coil portion 13 included in the bus bar 11, the transformer 8 can be easily manufactured. Since the transformer 8 can be easily manufactured, the productivity of the power converter 1 can be improved. Note that a member made of a different material from the core, such as resin, may be provided between the divided cores 81b and 81c forming the closed magnetic path. Thereby, the dimensions between the transformer core 81 and the coil portion 13 can be adjusted, and the electromagnetic characteristics of the transformer 8 can be adjusted to desired characteristics while maintaining insulation between each member.

The magnetic components having a magnetic core and a coil portion are not limited to the transformer 8 and the reactor 9, and filters and the like can also be configured in this way. The power conversion device 1 may include a plurality of magnetic components each having a magnetic core and a coil portion. By configuring the plurality of magnetic parts in this way, the heat generated by the plurality of magnetic parts can be easily radiated to the cooler 5. Moreover, since each of the plurality of magnetic components is formed from a magnetic core and a coil portion, each of the plurality of magnetic components can be easily manufactured.

The bus bar 11 having the coil portion 13 is fastened to another bus bar 12 by a first fastening member 21 . In this embodiment, the other busbars 12 have the coil portions 14 as described later, but the busbars 12 may be busbars that do not have coil portions. The width of the end portions of the bus bars 11 and 12 fastened by the first fastening member 21 is the same as the width of the other portions of the bus bars 11 and 12. The first fastening member 21 has a first extending portion 21a1 that is thermally connected to the cooling surface 5a via the insulating member 4. Since the resin member 61 integrally molded with the busbar coil 15 is fixed to the cooler 5 by the fixing member 231, the first extending portion 21a1 presses the insulating member 4.

With this configuration, the first extending portion 21a1 of the first fastening member 21 that fastens the bus bars 11 and 12 is thermally connected to the cooling surface 5a of the cooler 5 via the insulating member 4. Therefore, the heat generated in the busbars 12, the busbar coil 15, and the transformer 8 can be radiated to the cooler 5 while ensuring insulation between the busbars 11, 12 and the cooler 5. Since the ends of the bus bars 11 and 12 fastened by the first fastening member 21 have the same width as the other parts of the bus bars 11 and 12, the heat generated in the bus bars 12, the bus bar coil 15, and the transformer 8 is radiated. It is possible to obtain a power conversion device 1 that is small in size and has a low-cost cooling structure while maintaining its functions.

<Reactor 9>
In this embodiment, reactor 9, which is another magnetic component included in power conversion device 1, will be described. Hereinafter, the transformer core 81 described above will be referred to as a second magnetic core, the coil portion 13 as a second coil portion, and the bus bar 11 as a second bus bar. The reactor 9 has a reactor core 91 that is a first magnetic core and a coil section 14 that is a first coil section. The reactor core 91 has an annular outer circumferential core and a columnar central core 91a that connects two opposing portions of the outer circumferential core. The central core 91a extends in a direction away from the cooling surface 5a. Reactor core 91 is made of a magnetic material such as ferrite. In this embodiment, a reactor core 91 having a closed magnetic circuit structure is formed by overlapping two E-shaped split cores 91b and 91c in the Z direction. The configuration of the reactor core 91 is not limited to two split cores 91b and 91c formed in an E shape, but may be two split cores formed in an E shape and an I shape. Reactor core 91 is thermally connected to cooling surface 5a.

The bus bar 12, which is the first bus bar, has a coil portion 14 that is curved around the central core 91a, along the cooling surface 5a, and wound around the central core 91a. The bus bar 12 and the coil portion 14 are made of the same material and are integrated. The busbar 12 and the coil portion 14 included in the busbar 12 are collectively referred to as a busbar coil 16. The busbar coil 16 is integrally molded with the resin member 62 with a portion of the busbar 12 exposed. The resin member 62 is fixed to the cooler 5 by a fixing member 232. By fixing the resin member 62 to the cooler 5, the split core 91c is positioned in the XY direction and fixed to the cooler 5. The split core 91b is pressed by a pressing member (not shown) such as a spring, positioned in the Z direction, and fixed to the cooler 5.

Bus bar 12 and bus bar 11 are fastened together by a first fastening member 21 . The width of the end portions of the bus bars 11 and 12 fastened by the first fastening member 21 is the same as the width of the other portions of the bus bars 11 and 12. The first fastening member 21 has a first extending portion 21a1 that is thermally connected to the cooling surface 5a via the insulating member 4.

With this configuration, the first extending portion 21a1 of the first fastening member 21 that fastens the bus bars 11 and 12 is thermally connected to the cooling surface 5a of the cooler 5 via the insulating member 4. Therefore, while ensuring insulation between the busbars 11 and 12 and the cooler 5, the transformer 8 and the reactor 9 are electrically connected to cool the heat generated in the busbar coil 15, the busbar coil 16, the transformer 8, and the reactor 9. Heat can be radiated to the container 5. Since the heat generated in the busbar coil 15, busbar coil 16, transformer 8, and reactor 9 can be radiated to the cooler 5, the width and thickness of each coil can be reduced. Since the width and thickness of each coil can be reduced, the transformer 8 and the reactor 9 can be downsized, and the weight of the transformer 8 and the reactor 9 can be reduced. Since the transformer 8 and the reactor 9 can be downsized, the cost of the transformer 8 and the reactor 9 can be reduced. Furthermore, since the ends of the busbars 11 and 12 fastened by the first fastening member 21 have the same width as the other parts of the busbars 11 and 12, the busbar coil 15, busbar coil 16, transformer 8, and reactor 9 It is possible to obtain a power conversion device 1 that is small and has a low-cost cooling structure while maintaining the function of dissipating the generated heat.

In this embodiment, the additional bus bar 17 that the reactor 9 further has will be explained. The additional bus bar 17 curves around the central core 91a along the cooling surface 5a, and has an additional coil portion 18 provided so as to wind around the central core 91a. Additional busbars 17 and busbar coils 16 are made from the same material. The additional coil portion 18 of the additional bus bar 17 is integrally molded with the resin member 62. A member made of a material other than the core, such as resin, may be provided between the divided cores 91b and 91c forming the closed magnetic path. Thereby, the dimensions between the reactor core 91, the coil portion 14, and the additional coil portion 18 can be adjusted, and the electromagnetic characteristics of the reactor 9 can be adjusted to desired characteristics while maintaining insulation between each member.

The power conversion device 1 is an additional fastening member that fastens the additional connection portion 31 in which the bus bar 12 and the additional bus bar 17 overlap each other and are electrically connected, and is also thermally connected to the additional connection portion 31. A fourth fastening member 26 is provided. The fourth fastening member 26 has thermal conductivity. The coil portion 14 and the additional coil portion 18 have the same current flow direction around the center core 91a of the reactor core 91. The width of the end portions of the busbar 12 and the additional busbar 17 that are fastened by the fourth fastening member 26 is the same as the width of the other portions of the busbar 12 and the additional busbar 17. The fourth fastening member 26 extends further toward the cooler 5 than the additional connecting portion 31 and is an additional extending portion that is thermally connected to the cooling surface 5a via the insulating member 4. It has an exit portion 26a1. The fourth fastening member 26 includes a fastening portion 26a in which a screw hole is formed and a screw 26b. A portion of the fastening portion 26a on the cooling surface 5a side is the fourth extending portion 26a1. The fourth fastening member 26 is made of metal such as iron or stainless steel, for example. The resin member 62 integrally molded with the additional bus bar 17 is fixed to the cooler 5 by the fixing member 232, so that the fourth extending portion 26a1 presses the insulating member 4.

With this configuration, the additional connection portion 31 in which the bus bar 12 and the additional bus bar 17 are overlapped and electrically connected can cool the cooler 5 via the insulating member 4 by the fourth extension portion 26a1. Since it is thermally connected to the surface 5a, it is possible to directly radiate heat from a portion in the middle of the coil where the temperature rise is greatest and heat radiation is difficult. Since heat can be directly radiated from the intermediate portion of the coil, the temperature of the busbar coil 16 and the additional busbar 17 that constitute the reactor 9 can be reduced. Since the temperature of the busbar coil 16 and the additional busbar 17 can be reduced, the width and thickness of the busbar coil 16 and the additional busbar 17 can be reduced, and the reactor 9 can be made smaller. Since the reactor 9 is downsized, the power conversion device 1 is downsized and the cost of the power conversion device 1 can be reduced.

The miniaturization of the transformer 8 and reactor 9 will be explained. The size of the magnetic core of the transformer 8 and reactor 9 is determined by the inner diameter, outer diameter, thickness, electromagnetic characteristics, etc. of the coil parts 13 and 14 wound around the central cores 81a and 91a. Ru. Specifically, the cross-sectional area of the magnetic core in the closed magnetic path is determined by the electromagnetic characteristics. The distance in the Y direction from the central cores 81a, 91a to the outer pillars 82, 92 of the outer core shown in FIG. 14 is determined by the widths of the coil parts 13, 14. The outer pillar of the outer circumferential core is a portion of the outer circumferential core that extends in a direction away from the cooling surface 5a. The height of the magnetic core is determined according to the thickness of the coil parts 13, 14 so as to ensure a space in which the coil parts 13, 14 can be accommodated. Therefore, as the width and thickness of the coil parts 13 and 14 are reduced, the overall size of the magnetic core can be reduced. Since the size of the magnetic core can be reduced, the transformer 8 and reactor 9 can be downsized. Since the transformer 8 and the reactor 9 are downsized, the power converter 1 can be downsized. Moreover, since the equipment including the power conversion device 1 is also downsized, the cost of the equipment can be reduced.

In addition to downsizing the transformer 8 and reactor 9, the busbar coil 15, busbar coil 16, and additional busbar 17 are integrally molded with resin members 61 and 62, making it easier to manufacture and fix each member to the cooler 5. Since the process is simplified, the productivity of the power conversion device 1 can be improved. Since the productivity of the power conversion device 1 is improved, the manufacturing cost of the power conversion device 1 can be reduced. Note that in this embodiment, the busbar coil 15, the busbar coil 16, and the additional busbar 17 are integrally molded from the resin members 61 and 62, but these structures are not limited to the integrally molded configuration. Each member may be individually arranged one on top of the other and assembled into the cooler 5. When each member is individually stacked and assembled, the resin member 6 can be formed without integrally molding a plurality of members, so the molding process can be simplified.

As described above, the power conversion device 1 according to the fourth embodiment includes the transformer core 81 having the annular outer peripheral core and the columnar central core 81a, and the bus bar 11 extends around the central core 81a along the cooling surface 5a. Since the transformer core 81 is thermally connected to the cooling surface 5a, the heat generated in the transformer 8 can be easily radiated to the cooler 5. Further, since the transformer 8 is formed from the transformer core 81 and the coil portion 13 included in the bus bar 11, the transformer 8 can be easily manufactured.

When the power conversion device 1 includes a plurality of magnetic components such as a transformer 8 having a magnetic core and a coil portion, each of the plurality of magnetic components is thermally connected to the cooling surface 5a, so that the plurality of magnetic components The generated heat can be easily radiated to the cooler 5. Further, when the bus bar 11 having the coil portion 13 is fastened to another bus bar 12 by the first fastening member 21, the first extending portion 21a1 of the first fastening member 21 that fastens the bus bars 11 and 12 is , are thermally connected to the cooling surface 5a of the cooler 5 via the insulating member 4, so while ensuring insulation between the busbars 11, 12 and the cooler 5, the busbar coil 15 including the busbar 11, the busbar 12, and Heat generated in the transformer 8 can be radiated to the cooler 5.

A reactor core 91, a bus bar 12 having a coil portion 14 curved around the center core 91a of the reactor core 91, a bus bar 11 having a transformer core 81, and a coil portion 13 curved around the center core 81a of the transformer core 81. When the bus bar 12 and the bus bar 11 are fastened by the first fastening member 21, the first extending portion 21a1 of the first fastening member 21 that fastens the bus bars 11 and 12 connects the insulating member 4. Since it is thermally connected to the cooling surface 5a of the cooler 5 through the busbar coil 15, the transformer 8 and the reactor 9 are electrically connected while ensuring insulation between the busbars 11 and 12 and the cooler 5. Heat generated in the busbar coil 16, transformer 8, and reactor 9 can be radiated to the cooler 5. Since the heat generated in the busbar coil 15, busbar coil 16, transformer 8, and reactor 9 can be radiated to the cooler 5, the width and thickness of each coil can be reduced. Since the width and thickness of each coil can be reduced, the transformer 8 and the reactor 9 can be downsized, and the weight of the transformer 8 and the reactor 9 can be reduced.

An additional bus bar 17 having an additional coil portion 18 curved around the central core 91a of the reactor core 91, and an additional connection portion 31 in which the bus bar 12 and the additional bus bar 17 overlap each other and are electrically connected are fastened. and a fourth fastening member 26 thermally connected to the additional connecting portion 31, the fourth fastening member 26 extending toward the cooler 5 than the additional connecting portion 31, and extending through the insulating member 4. , when the fourth extension part 26a1 is thermally connected to the cooling surface 5a, the additional connection part 31 is connected to the cooling surface 5a of the cooler 5 via the insulating member 4 by the fourth extension part 26a1. Since it is thermally connected, heat can be directly radiated from the part in the middle of the coil where the temperature rise is the greatest and heat radiation is difficult. Since heat can be directly radiated from the intermediate portion of the coil, the temperature of the busbar coil 16 and the additional busbar 17 that constitute the reactor 9 can be reduced. Since the temperature of the busbar coil 16 and the additional busbar 17 can be reduced, the width and thickness of the busbar coil 16 and the additional busbar 17 can be reduced, and the reactor 9 can be made smaller.

Additionally, while this application describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments may differ from those described in a particular embodiment. The invention is not limited to application, and can be applied to the embodiments alone or in various combinations.
Accordingly, countless variations not illustrated are envisioned within the scope of the technology disclosed herein. For example, this includes cases where at least one component is modified, added, or omitted, and cases where at least one component is extracted and combined with components of other embodiments.

Reference Signs List 1 power conversion device, 11 bus bar, 11a protrusion, 12 bus bar, 12a protrusion, 12a1 molded bus bar protrusion, 12b end, 12c recess, 13 coil portion, 14 coil portion, 15 bus bar coil, 16 bus bar coil, 17 addition bus bar, 18 additional coil part, 21 first fastening member, 21a fastening part, 21a1 first extension part, 21b screw, 22 second fastening member, 22a fastening part, 22a1 second extension part, 22b screw , 23 fixing member, 23a fastening part, 23b screw, 24 third fastening member, 24a fastening part, 24a1 third extension part, 24b screw, 25 third fastening member, 25a fastening part, 25a1 third extension part , 25b screw, 26 fourth fastening member, 26a fastening part, 26a1 fourth extension part, 26b screw, 30 connecting part, 31 additional connecting part, 4 insulating member, 5 cooler, 5a cooling surface, 5b screw hole, 5c recess, 5d protrusion, 6 resin member, 6a protrusion, 6b recess, 6c protrusion, 7 electronic component, 8 transformer, 81 transformer core, 81a center core, 81b split core, 81c split core, 81d split core, 81e Split core, 82 outer column, 9 reactor, 91 reactor core, 91a center core, 91b split core, 91c split core, 92 outer column, 100 diode, 110 capacitor

Claims (12)

multiple busbars,
a first fastening member that fastens a connecting portion in which at least two of the bus bars overlap each other and are electrically connected, is thermally connected to the connecting portion, and has thermal conductivity;
a cooler having a cooling surface facing the plurality of bus bars;
an insulating member provided between the cooling surface and the bus bar and having thermal conductivity and electrical insulation;
comprising a magnetic core;
The first fastening member has a first extending portion that extends toward the cooler from the connecting portion and is thermally connected to the cooling surface via the insulating member,
The magnetic core has a core extension portion that is a portion extending in a direction away from the cooling surface,
The bus bar has a coil portion curved around the core extension portion along the cooling surface,
the magnetic core is thermally connected to the cooling surface ;
A non-connected portion of the bus bar other than the connected portion has a protruding portion that is bent and protruded in the direction of the cooler from a portion spaced apart from the cooler,
The protrusion is thermally connected to the cooling surface via the insulating member,
electronic parts and
further comprising a second fastening member that thermally or electrically connects the electronic component to a non-connected portion other than the connected portion of the bus bar and has thermal conductivity;
The second fastening member extends toward the cooler from a portion of the unconnected portion to which the second fastening member is connected, and is thermally connected to the cooling surface via the insulating member. A power conversion device having a second extension portion . The power conversion device according to claim 1, wherein the magnetic core has an annular outer core and a central core that is a columnar core extension connecting two opposing portions of the outer core. . The power conversion device according to claim 1 or 2, comprising a plurality of magnetic components each having the magnetic core and the coil portion. The power conversion device according to any one of claims 1 to 3, wherein the bus bar having the coil portion is fastened to another bus bar by the first fastening member. the first magnetic core, the first bus bar having the first coil portion curved around the core extension portion of the first magnetic core, the second magnetic core, and the second magnetic core; a second bus bar having a second coil portion curved around the core extension portion of the magnetic core;
The power conversion device according to any one of claims 1 to 4, wherein the first bus bar and the second bus bar are fastened by the first fastening member. the first magnetic core, the first bus bar having the first coil portion curved around the core extension portion of the first magnetic core; The additional bus bar having the additional coil part curved around the exit part, the first bus bar and the additional bus bar overlap each other to fasten an electrically connected additional connection part and the additional bus bar. an additional fastening member that is thermally connected to the connecting part and has thermal conductivity;
The first coil part and the additional coil part have the same current flow direction around the core extension part of the first magnetic core,
The additional fastening member has an additional extension portion that extends further toward the cooler than the additional connection portion and is thermally connected to the cooling surface via the insulating member. 6. The power conversion device according to any one of 1 to 5. comprising a resin member integrally molded with one or more of the plurality of bus bars, the first fastening member, and the second fastening member,
The power conversion device according to claim 1 , wherein the resin member is fixed to the cooling surface. a third fastening member having a portion integrally molded with the resin member and having thermal conductivity;
The non-molded bus bar, which is the bus bar that is not integrally molded with the resin member, is fixed to the resin member by the third fastening member,
A portion of the third fastening member that is integrally molded with the resin member extends further toward the cooler than a portion of the non-molded bus bar to which the third fastening member is connected, and is exposed from the resin member. The power conversion device according to claim 7 , further comprising a third extending portion that is thermally connected to the cooling surface via the insulating member. The non-molded bus bar, which is the bus bar that is not integrally molded with the resin member, has at least two protrusions, the resin member has at least two recesses, and the at least two protrusions of the non-molded bus bar have at least two protrusions. and the at least two recesses of the resin member are fitted into each other and positioned,
Alternatively, the non-molded bus bar that is the bus bar that is not integrally molded with the resin member has at least two recesses, the resin member has at least two protrusions, and the non-molded bus bar has at least two protrusions. The power conversion device according to claim 7 or 8 , wherein the recess and at least two of the protrusions of the resin member are positioned by fitting into each other. The cooling surface has at least two recesses, the resin member has at least two protrusions, and the at least two recesses of the cooling surface and the at least two protrusions of the resin member, are fitted into each other and positioned,
Alternatively, the cooling surface has at least two protrusions, and the resin member has at least two recesses, and the at least two protrusions on the cooling surface and the at least two recesses on the resin member. The power conversion device according to any one of claims 7 to 9 , wherein the power converters are positioned so as to fit into each other. The resin member integrally molds at least the first fastening member and the second fastening member,
The first fastening member and the second fastening member integrally formed protrude from the resin member toward the cooler and are thermally connected to the cooling surface via the insulating member. The power conversion device according to any one of Items 7 to 10 . The resin member at least integrally molds the bus bar,
A non-connecting portion other than the connecting portion of the integrally molded bus bar has a molded bus bar protrusion that is bent and protrudes in the direction of the cooler from a portion spaced apart from the cooler,
The molded bus bar protrusion portion protrudes from the resin member toward the cooler and is thermally connected to the cooling surface via the insulating member. Power converter.

Images