# US 2021/0243922 A1 · Cooling system for power conversion device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0243922 A1 - Document ID: US20210243922A1 - Status: Published application - Kind: A1 - Application number: 17/265,575 - Filed: 2018-08-09 - Published: 2021-08-05 - Earliest claimed: 2018-08-09 - Assignees: Nissan Motor Co., Ltd.; RENAULT s.a.s. - Applicants: Nissan Motor Co., Ltd.; Renault S.A.S. - Inventors: Naoki TAKAHASHI; Yukinori TSUKAMOTO - Web page: https://patentgrep.com/patent/US20210243922A1 ## CPC - H05K 7/20927: {Liquid coolant without phase change} - H05K 7/20909: {Forced ventilation, e.g. on heat dissipaters coupled to components} - H05K 7/20918: {the components being isolated from air flow, e.g. hollow heat sinks, wind tunnels or funnels} - H05K 7/20945: {Thermal management, e.g. inverter temperature control} - H10W 40/22: characterised by their shape, e.g. having conical or cylindrical projections - H10W 40/43: by flowing gases, e.g. forced air cooling - H10W 40/47: by flowing liquids, e.g. forced water cooling - H02M 1/327: {against abnormal temperatures} - H02M 7/003: {Constructional details, e.g. physical layout, assembly, wiring or busbar connections} - H10W 40/611: {Bolts or screws} - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) ## Abstract Provided is a cooling system for a power conversion device that includes a radiator, a radiator fan supplying air to the radiator, and a power conversion device including a plurality of electric components and a casing housing the plurality of electric components inside. The casing includes a base portion which is formed of a non-metallic material and on which the plurality of electric components is placed and a cover portion formed of a metallic material, fixed to the base portion, and covering a periphery of the plurality of electric components. A refrigerant channel through which a refrigerant cooling the plurality of electric components flows is formed in the base portion of the casing, and the casing is disposed at a position where an airflow of the radiator fan is applied to the cover portion. ## Claims ### Claim 1 A cooling system for a power conversion device, comprising: a radiator; a radiator fan supplying air to the radiator; and a power conversion device including a plurality of electric components and a casing housing the plurality of electric components inside, wherein the casing includes a base portion which is formed of a non-metallic material and on which the plurality of electric components is placed and a cover portion formed of a metallic material, fixed to the base portion, and covering a periphery of the plurality of electric components, a refrigerant channel through which a refrigerant cooling the plurality of electric components flows is formed in the base portion of the casing, and the casing is disposed at a position where an airflow of the radiator fan is applied to the cover portion. ### Claim 2 (depends on 1) The cooling system for the power conversion device according to claim 1, wherein the power conversion device is mounted in a vehicle, and the cover portion of the casing is fastened to a component having rigidity higher than rigidity of the base portion. ### Claim 3 (depends on 1) The cooling system for the power conversion device according to claim 1, wherein the casing includes a heat sink structure on an outer surface of the cover portion. ### Claim 4 (depends on 3) The cooling system for the power conversion device according to claim 3, wherein the casing is installed to face the radiator, and the heat sink structure is not provided on a side wall on a side opposite to a side wall facing the radiator of the cover portion of the casing. ### Claim 5 (depends on 3) The cooling system for the power conversion device according to claim 3, wherein the heat sink structure is a fin projecting from the cover portion to an outside of the casing. ### Claim 6 (depends on 1) The cooling system for the power conversion device according to claim 1, further comprising: a control unit controlling an operation of the radiator fan, wherein when a temperature of the refrigerant flowing through an inside of the refrigerant channel is higher than a predetermined temperature, the control unit drives the radiator fan at a rotation speed according to the temperature of the refrigerant. ### Claim 7 (depends on 6) The cooling system for the power conversion device according to claim 6, wherein when a temperature of the power conversion device is higher than a predetermined temperature even in a case where the temperature of the refrigerant is equal to or less than the predetermined temperature, the control unit drives the radiator fan at a rotation speed according to the temperature of the power conversion device. ### Claim 8 (depends on 7) The cooling system for the power conversion device according to claim 7, further comprising: a rotary electric machine electrically connected to the power conversion device, wherein when a temperature of the rotary electric machine is higher than a predetermined temperature even in a case where the temperature of the refrigerant and the temperature of the power conversion device are equal to or less than the predetermined temperatures, the control unit drives the radiator fan at a rotation speed according to the temperature of the rotary electric machine.