# US 12,184,080 B2 · Wireless power supply unit and wireless power transmission system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,184,080 B2 - Document ID: US12184080B2 - Status: Granted - Kind: B2 - Application number: 18/255,976 - Filed: 2020-12-09 - Published: 2024-02-01 - Granted: 2024-12-31 - Earliest claimed: 2020-12-09 - Assignees: Panasonic Intellectual Property Management Co., Ltd. - Applicants: Panasonic Intellectual Property Management Co., Ltd. - Inventors: Hideaki Miyamoto; Eiji Takahashi; Tsutomu Sakata - Web page: https://patentgrep.com/patent/US12184080B2 ## CPC - H02J 50/005: {Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices} - B60L 53/12: Inductive energy transfer - H01F 27/36: Electric or magnetic shields or screens (movable for varying inductance H01F21/10) - H01F 27/363: {made of electrically conductive material} - H01F 27/366: {made of ferromagnetic material} - H01F 38/14: Inductive couplings - H02J 50/10: using inductive coupling - H02J 50/70: involving the reduction of electric, magnetic or electromagnetic leakage fields - H02J 50/90: involving detection or optimisation of position, e.g. alignment - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors - Y02T 90/14: Plug-in electric vehicles - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A wireless power supply unit includes: a power transmitting coil; and a power receiving coil that wirelessly receives electric power from the power transmitting coil. One of the power transmitting coil and the power receiving coil is shaped so that, during use, a central portion thereof is located beyond an outer peripheral portion thereof, as viewed from another one of the power transmitting coil and the power receiving coil. ## Claims ### Claim 1 A wireless power supply unit comprising: a power transmitting coil; and a power receiving coil that wirelessly receives electric power from the power transmitting coil, wherein: a first coil is one of the power transmitting coil or the power receiving coil and has a first central portion and a first outer peripheral portion, and a second coil is another of the power transmitting coil or the power receiving coil, the first coil includes a first recess surrounded by the first central portion and the first outer peripheral portion, and the first coil is shaped so that, when coupled with the second coil to wirelessly transmit the power, the first central portion is located farther away from the second coil than the first outer peripheral portion thereof, when viewed from the second coil, and the second coil is disposed inside the first recess. ### Claim 2 (depends on 1) The wireless power supply unit of claim 1, wherein: the second coil has a second central portion and a second outer peripheral portion, and the second coil is shaped so that, when coupled with the second coil to wirelessly transmit the power, the second central portion is located in front of the second outer peripheral portion, as viewed from the first coil. ### Claim 3 (depends on 2) The wireless power supply unit of claim 2, wherein: the second coil includes a second recess surrounded by the second central portion and the second outer peripheral portion, and the second central portion is disposed within the interior of the first recess. ### Claim 4 (depends on 1) The wireless power supply unit of claim 1, wherein: the second coil has a second central portion and a second outer peripheral portion, and when coupled with the second coil to wirelessly transmit the power, at least the second central portion of the second coil is located beyond the first central portion of the first coil and in front of the first outer peripheral portion of the first coil, as viewed from the first coil. ### Claim 5 (depends on 1) The wireless power supply unit of claim 1, wherein the second coil is equal in size to, or smaller in size than, the first coil. ### Claim 6 (depends on 1) The wireless power supply unit of claim 1, wherein the first coil has a curved shape presenting a curved surface. ### Claim 7 (depends on 1) The wireless power supply unit of claim 1, wherein the second coil has a curved shape presenting a curved surface. ### Claim 8 (depends on 1) The wireless power supply unit of claim 1, wherein: the first coil is the power transmitting coil, and the second coil is the power receiving coil. ### Claim 9 (depends on 1) The wireless power supply unit of claim 1, further comprising at least one of: a first magnetic shield that is disposed at an opposite side of the first coil to a side where the second coil is located; or a second magnetic shield that is disposed at an opposite side of the second coil to a side where the first coil is located. ### Claim 10 (depends on 9) The wireless power supply unit of claim 9, wherein: at least one of the first coil or the second coil has a curved shape presenting a curved surface, and the at least one of the first magnetic shield or the second magnetic shield has a shape that is curved along the first coil or the second coil. ### Claim 11 (depends on 1) The wireless power supply unit of claim 1, further comprising at least one of: a first electrical conduction shield that is disposed at an opposite side of the first coil to a side where the second coil is located; or a second electrical conduction shield that is disposed at an opposite side of the second coil to a side where the first coil is located. ### Claim 12 (depends on 11) The wireless power supply unit of claim 11, wherein: at least one of the first coil or the second coil has a curved shape presenting a curved surface, and the at least one of the first electrical conduction shield or the second electrical conduction shield has a shape that is curved along the first coil or the second coil. ### Claim 13 (depends on 11) The wireless power supply unit of claim 11, wherein the at least one of the first electrical conduction shield or the second electrical conduction shield has a box-like structure covering the first coil or the second coil. ### Claim 14 (depends on 1) The wireless power supply unit of claim 1, further comprising a power transmitting circuit to supply AC power to the power transmitting coil. ### Claim 15 (depends on 1) The wireless power supply unit of claim 1, further comprising a power receiving circuit to convert the electric power received by the power receiving coil into another form of electric power and to supply the other form of electric power to a load. ### Claim 16 A wireless power transmission system comprising: a power transmitting device comprising a power transmitting coil; and an electric vehicle comprising a power receiving coil, wherein: the power receiving coil wirelessly receives electric power from the power transmitting coil, a first coil is one of the power transmitting coil or the power receiving coil and has a first central portion and a first outer peripheral portion, and a second coil is another of the power transmitting coil or the power receiving coil, the first coil includes a first recess surrounded by the first central portion and the first outer peripheral portion, the first coil is shaped so that, when coupled with the second coil to wirelessly transmit the power, the first central portion is located farther away from the second coil than the first outer peripheral portion thereof, when viewed from the second coil, and the second coil is disposed inside the first recess.