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EP-4131357-B1 - POWER CONVERSION DEVICE

EP4131357B1EP 4131357 B1EP4131357 B1EP 4131357B1EP-4131357-B1

Inventors

  • SEO, MASAHIRO
  • TOKUYAMA, TAKESHI
  • ARAKI, TAKAHIRO

Dates

Publication Date
20260506
Application Date
20210311

Claims (5)

  1. A power conversion device comprising: a capacitor (5, 14) for smoothing a direct current power; a plurality of power modules (4) for converting the direct current power into an alternating current power; a first substrate (1) on which the power modules are arranged; a second substrate (2) arranged opposite to the first substrate (1); a first flow path forming body (3) that forms a flow path for passing a refrigerant with a first surface of the first substrate and a second surface of the second substrate joined together; and a second flow path forming body (27) that forms the flow path together with the surface of the first substrate (1), wherein the first flow path forming body (3) includes a plurality of through holes for cooling the respective power modules (4), wherein the power modules (4) are respectively arranged on the first substrate (1) in a circumferential direction; and the second flow path forming body (27) includes a module flow path unit for cooling each of the power modules (4) individually.
  2. The device according to claim 1, comprising a control circuit substrate (30) electrically connected to the first substrate (1) for outputting a control signal of the power modules (4), in which the second flow path forming body (27) has a pair of a first surface and a second surface, wherein the first surface is in contact with the first substrate (1) and on the second surface the control circuit substrate (30) is mounted.
  3. The device according to claim 1, in which the first flow path forming body (3) includes a plurality of concave portions for passing the refrigerant.
  4. The device according to claim 1, in which the first substrate (1) includes a plurality of through holes for cooling the power modules (4).
  5. The device according to claim 4, in which the power modules (4) are respectively arranged on the first substrate (1) in a circumferential direction, and the second flow path forming body (27) is provided in each of the power modules (4) individually.

Description

Technical Field The invention relates to a power conversion device. Background Art In the industrial machines and vehicles (for example, automobiles and railroad vehicles), the electrification and the electronic control of power sources are rapidly progressing from the viewpoint of energy saving and precise operation control. Along with this, conventionally, with respect to a power module for controlling the power of a power source and an electronic circuit device for converting electric power using the power module, for example, in the case of an electric vehicle equipped with a power conversion device and a motor, the power conversion device is desired to be thin in order to expand a space inside the vehicle. The following Patent Literature 1 is known as a background technique for the invention. The Patent Literature 1 discloses a technique for downsizing a power conversion device by making a power module and a capacitor module of the power conversion device sandwich a flow path of cooling water. Citation List Patent Literature Patent Literature 1: Japanese Patent Laid-Open No. 2009-44891Patent Literature 2: JP 2019 161797 APatent Literature 3: JP 2001 045601 APatent Literature 4: US 2009/154101 A1Patent literature 2 describes a power conversion device comprising a refrigerant path with power modules arranged inside the refrigerant path.Patent literature 3 describes a heat sink attached to a power conversion device.Patent literature 4 describes a power conversion with a cooling system arranged therein. Summary of Invention Technical Problem When a thinner power conversion device than this is further required, the technique described in the Patent Literature 1 hardly changes the configuration in reply to this requirement. In view of this, the invention is to realize a thinner power conversion device, by having a cooling performance that can efficiently cool a power conversion element, a power smoothing element, wiring, and the like on a circuit substrate and at the same time by having a sealing performance that can prevent a refrigerant flowing inside a flow path from leaking to the outside. Solution to Problem A power conversion device according to the invention incudes a capacitor for smoothing a direct current power, a plurality of power modules for converting the direct current power into an alternating current power, a first substrate on which the power modules are arranged, a second substrate arranged opposite to the first substrate, a first flow path forming body that forms a flow path for passing a refrigerant with the both surfaces of the first substrate and the second substrate joined together, and a second flow path forming body that forms the flow path together with the surface of the first substrate, in which the both surfaces of the power modules are cooled by the refrigerant. Advantageous Effects of Invention According to the invention, it is possible to realize a thinner power conversion device that has both the cooling performance and the sealing performance. Brief Description of Drawings Fig. 1 is an electric circuit diagram of a power conversion device according to the invention.Fig. 2 is an explanatory view of the power conversion device according to a first embodiment of the invention.Fig. 3 is a view when a top of the flow path forming body 27 in Fig. 2 and a control circuit substrate are installed there.Fig. 4 is a view of a first circuit substrate with the flow path forming body 27 removed from Fig. 2.Fig. 5 is an explanatory view of a flow path forming body 3 with the first circuit substrate 1 removed from Fig. 4.Fig. 6 is a cross-sectional view taken along the line A-A' of Fig. 5.Fig. 7 is a view of a second circuit substrate 2.Fig. 8 is an explanatory view of the flow path forming body 3 (rear surface of Fig. 5) with the second circuit substrate 2 removed from Fig. 7.Fig. 9 is a cross-sectional view taken along the line B-B' of Fig. 8.Fig. 10 is an explanatory view of a power conversion device according to a second embodiment of the invention.Fig. 11 is an explanatory view of a flow path forming body 27A formed around a power module 4A of Fig. 10.Fig. 12 is an explanatory view of a flow path forming body 3A with a first circuit substrate 1A removed from Fig. 10.Fig. 13 is a view of a rear surface of the flow path forming body 3A of Fig. 12.Fig. 14 is an explanatory view of a power conversion device according to a third embodiment of the invention.Fig. 15 is an explanatory view of a power conversion device according to a fourth embodiment of the invention. Description of Embodiments Hereinafter, embodiments of the invention will be described using the drawings. (Configuration of Electric Circuit of Power Conversion Device) Fig. 1 is an electric circuit diagram of a power conversion device of the invention. The power conversion device converts a direct current power supplied from a battery mounted in a vehicle, into an alternating current power, smooths the power with capacitors co