# US 2026/0074564 A1 · Power transmission coil unit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2026/0074564 A1 - Document ID: US20260074564A1 - Status: Published application - Kind: A1 - Application number: 19/109,561 - Filed: 2023-07-20 - Published: 2026-03-12 - Earliest claimed: 2022-09-12 - Assignees: Toyota Jidosha Kabushiki Kaisha; Denso Corporation - Applicants: Toyota Jidosha Kabushiki Kaisha; Denso Corporation - Inventors: Katsuya KOBAYASHI; Toshiya HASHIMOTO; Shinjiro SAIGUSA; Osamu YAMASHITA; Naoki IWATA; Sungmin CHO; Shimpei TAKITA; Eisuke TAKAHASHI; Nobuhisa YAMAGUCHI - Web page: https://patentgrep.com/patent/US20260074564A1 ## CPC - H02J 50/12: of the resonant type - H01F 27/22: Cooling by heat conduction through solid or powdered fillings - H01F 27/2847: {Sheets; Strips (H01F27/2866 takes precedence)} - H01F 27/29: Terminals; Tapping arrangements {for signal inductances} - H01F 27/323: {Insulation between winding turns, between winding layers} - H01F 38/14: Inductive couplings - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract A power transmission coil unit includes a power transmission coil and a power supply member electrically connected to a power source and power transmission coil. The power supply member is provided with a first metal sheet and second metal sheet insulated through an insulating layer and is configured so that when electric power has been supplied from the power source, current flows through one of the first metal sheet or second metal sheet to the power transmission coil and the current flowing through the power transmission coil is returned through the other of the first metal sheet or second metal sheet to the power source and configured so that the direction of the current flowing through the first metal sheet and the direction of the current flowing through the second metal sheet become opposite. ## Claims ### Claim 1 A power transmission coil unit for noncontact power supply comprising: a power transmission coil; and a power supply member electrically connected to a power source and power transmission coil and supplying electric power supplied from the power source to the power transmission coil, wherein the power supply member is provided with a first metal sheet and second metal sheet insulated through an insulating layer and is configured so that when electric power has been supplied from the power source, current flows through one of the first metal sheet or second metal sheet to the power transmission coil and the current flowing through the power transmission coil is returned through the other of the first metal sheet or second metal sheet to the power source and configured so that the direction of the current flowing through the first metal sheet and the direction of the current flowing through the second metal sheet become opposite. ### Claim 2 (depends on 1) The power transmission coil unit according to claim 1, wherein the power supply member has a pair of power supply terminals for supplying electric power from the power source to the power supply member and a pair of power transmission coil connection terminals for supplying electric power supplied to the power supply member to the power transmission coil, a first power supply terminal of one of the pair of power supply terminals is used as the terminal for electrical connection with one output terminal of the power source and is conductive with the first metal sheet, a second power supply terminal of the other of the pair of power supply terminals is used as the terminal for electrical connection with the other output terminal of the power source and is conductive with the second metal sheet, a first power transmission coil connection terminal of one of the pair of power transmission coil connection terminals is used as a terminal for electrical connection with one end part of the power transmission coil and is conductive with the first metal sheet, a second power transmission coil connection terminal of the other of the pair of power transmission coil connection terminals is used as a terminal for electrical connection with the other end part of the power transmission coil and is conductive with the second metal sheet, and the positions of the pair of power supply terminals on the power supply member are determined so that the direction of the current flowing through the first metal sheet and the direction of the current flowing through the second metal sheet become opposite. ### Claim 3 (depends on 2) The power transmission coil unit according to claim 2, wherein the pair of power supply terminals are also used as terminals for electrically connecting another power transmission coil unit. ### Claim 4 (depends on 1) The power transmission coil unit according to claim 1, to wherein the power transmission coil is placed at a front surface side of the power supply member, and the power supply member is provided with a heat dissipating material running through the power supply member from the front surface side to the rear surface side. ### Claim 5 (depends on 4) The power transmission coil unit according to claim 4, wherein the power supply member comprises: a front side insulating sheet arranged at a front side of the first metal sheet; an intermediate insulating sheet as the insulating layer arranged between the first metal sheet and the second metal sheet; and a rear side insulating sheet arranged at a rear side of the second metal sheet, and the heat dissipating material runs through the front side insulating sheet, first metal sheet, intermediate insulating sheet, second metal sheet, and rear side insulating sheet and dissipates heat of the power transmission coil to the rear surface side of the power supply member.