# US 11,897,348 B2 · Power transmission device, wireless power transmission system, and information communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,897,348 B2 - Document ID: US11897348B2 - Status: Granted - Kind: B2 - Application number: 17/365,257 - Filed: 2021-07-01 - Published: 2022-02-03 - Granted: 2024-02-13 - Earliest claimed: 2020-07-29 - Assignees: TDK Corporation - Applicants: TDK Corporation - Inventors: Akira Gotani - Web page: https://patentgrep.com/patent/US11897348B2 ## CPC - B60L 53/124: Detection or removal of foreign bodies - B60L 53/38: specially adapted for charging by inductive energy transfer - H02J 50/60: responsive to the presence of foreign objects, e.g. detection of living beings - H02J 50/90: involving detection or optimisation of position, e.g. alignment - H02J 13/1331: {using wireless data transmission} - H02J 50/402: {the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas} - 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 90/12: Electric charging stations - Y02T 90/14: Plug-in electric vehicles - Y02T 90/16: Information or communication technologies improving the operation of electric vehicles - 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 - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A power transmission device that wirelessly transmits power to a vehicle, the power transmission device including an information emitter that, in a case in which the position of the vehicle acquired by the information acquirer is located in a power transmission range of the power transmission coil and, also, the instruction receiver receives the instruction about power transmission, emits a first type of information that indicates a presence of the foreign object when the detector detects the foreign object, and in a case in which the instruction receiver does not receive the instruction about power transmission even though the position of the vehicle acquired by the position information acquirer is located in the power transmission range of the power transmission coil, does not emit the information that indicates the presence of the foreign object. ## Claims ### Claim 1 A power transmission device that wirelessly transmits power to a vehicle provided with a power receiving function, the power transmission device comprising: a power transmitter that includes a power transmission coil and that transmits power to the vehicle via the power transmission coil; a detector that includes a function for detecting a foreign object present in a detection target region; a position information acquirer that acquires a position of the vehicle; an instruction receiver that receives an instruction about power transmission to the vehicle; and an information emitter that in a case in which the position of the vehicle acquired by the information acquirer is located in a power transmission range of the power transmission coil and, also, the instruction receiver receives the instruction about power transmission, emits a first type of information that indicates a presence of the foreign object when the detector detects the foreign object, and in a case in which the instruction receiver does not receive the instruction about power transmission even though the position of the vehicle acquired by the position information acquirer is located in the power transmission range of the power transmission coil, does not emit the information that indicates the presence of the foreign object. ### Claim 2 (depends on 1) The power transmission device according to claim 1, wherein the detector disables the function for detecting the foreign object in the case in which the instruction receiver does not receive the instruction about power transmission even though the position of the vehicle acquired by the position information acquirer is located in the power transmission range of the power transmission coil. ### Claim 3 (depends on 1) The power transmission device according to claim 1, wherein the power transmitter further includes a power transmission circuit that supplies electric power to the power transmission coil, and in the case in which the position of the vehicle acquired by the position information acquirer is located in the power transmission range of the power transmission coil and, also, the instruction receiver receives the instruction about power transmission, the power transmission circuit stops the supply of electric power to the power transmission coil in a period in which the detector detects the foreign object, and starts the supply of electric power to the power transmission coil after the detector no longer detects the foreign object. ### Claim 4 (depends on 1) The power transmission device according to claim 1, wherein the information emitter in a case in which the position of the vehicle acquired by the position information acquirer is separated farther from the power transmission coil than a reference position, emits a second type of information that indicates the presence of the foreign object when the detector detects the foreign object, and in a case in which the position of the vehicle acquired by the position information acquirer is closer to the power transmission coil than the reference position, does not emit the information that indicates the presence of the foreign object. ### Claim 5 (depends on 4) The power transmission device according to claim 4, wherein the reference position is set to a position separated from the power transmission coil by a braking distance of the vehicle. ### Claim 6 (depends on 4) The power transmission device according to claim 4, wherein the reference position is set to a position of the vehicle when a portion of the vehicle covers the power transmission coil. ### Claim 7 (depends on 4) The power transmission device according to claim 4, wherein in a case in which the position of the vehicle acquired by the position information acquirer is closer to the power transmission coil than the reference position, the detector disables the function for detecting the foreign object. ### Claim 8 (depends on 4) A wireless power transmission system, comprising: the power transmission device according to claim 4; and a vehicle that receives electric power sent from the power transmission coil of the power transmission device, the vehicle including a driver that generates motive force, a communicator that receives the second type of information emitted from the information emitter of the power transmission device, and a controller that controls the driver on the basis of receipt of the second type of information by the communicator. ### Claim 9 (depends on 1) A wireless power transmission system, comprising: the power transmission device according to claim 1; and a power receiving device that receives electric power sent from the power transmission coil of the power transmission device. ### Claim 10 (depends on 1) An information communication system, comprising: the power transmission device according to claim 1; and a communication device that receives the first type of information emitted from the information emitter of the power transmission device.