# US 12,191,676 B2 · Power receiving device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,191,676 B2 - Document ID: US12191676B2 - Status: Granted - Kind: B2 - Application number: 17/409,057 - Filed: 2021-08-23 - Published: 2021-12-09 - Granted: 2025-01-07 - Earliest claimed: 2019-02-22 - Assignees: Denso Corporation - Applicants: Denso Corporation - Inventors: Masato Mukoyama; Masaki Kanesaki - Web page: https://patentgrep.com/patent/US12191676B2 ## CPC - H02J 7/02: for charging batteries from AC mains by converters - H02J 50/12: of the resonant type - B60L 53/12: Inductive energy transfer - B60L 53/122: Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil - H02J 50/05: using capacitive coupling - H02M 1/0048: {Circuits or arrangements for reducing losses (using snubbers H02M1/34)} - H02M 1/007: {Plural converter units in cascade (push-pull DC/DC converters with pre-regulator H02M3/3374; DC-AC converters following a DC-DC stage including a high frequency transformer H02M7/4807; DC-AC converters following a DC-DC conversion stage generating periodically varying voltages H02M7/4826)} - H02M 3/155: using semiconductor devices only - H02M 7/06: using discharge tubes without control electrode or semiconductor devices without control electrode - H02J 50/40: using two or more transmitting or receiving devices (H02J50/50 takes precedence) - H02J 2105/37: exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV] - H02M 7/5387: in a bridge configuration - H04B 5/79: for data transfer in combination with power transfer - 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 - 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) - H04B: TRANSMISSION - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A power receiving device receives power from a power transmitting device including a primary coil in a contactless manner and supplies power to a power storage device. The power receiving device includes a secondary coil that receives AC power of a predetermined frequency from the primary coil, a capacitor that is connected to the secondary coil and constitutes a resonant circuit together with the secondary coil, a rectifier circuit that rectifies output power from the resonant circuit, a power conditioning circuit that is provided between the power storage device and the rectifier circuit and includes a switch, and a control device that controls the switch by a predetermined driving frequency. The driving frequency is a frequency obtained by dividing the predetermined frequency of the AC power by a natural number equal to or greater than 2. ## Claims ### Claim 1 A power receiving device that receives power from a power transmitting device including a primary coil in a contactless manner and supplies power to a power storage device, the power receiving device comprising: a secondary coil that receives AC power from the primary coil; a capacitor connected to the secondary coil and constituting a resonant circuit together with the secondary coil; a rectifier circuit that rectifies output power from the resonant circuit; a power conditioning circuit that is disposed between the power storage device and the rectifier circuit and includes a switch; and a control device that: controls the switch using a driving frequency that is set based on the stability of the AC power received by the secondary coil, wherein the driving frequency is obtained by dividing the frequency of the AC power by a natural number equal to or greater than 2; estimates the stability of the AC power received by the secondary coil based on a determination of whether fluctuation of the power received by the secondary coil satisfies a threshold; varies the natural number based on the determination, wherein when the power received by the secondary coil satisfies the threshold, the natural number is increased, and when the power received by the secondary coil does not satisfy the threshold, the natural number is decreased; and sets the driving frequency based on the estimated stability of the AC power received by the secondary coil. ### Claim 2 (depends on 1) The power receiving device according to claim 1, wherein the natural number is a number within a range of 2 to 10. ### Claim 3 (depends on 1) The power receiving device according to claim 1, wherein, constant current is output from the rectifier circuit, and the power conditioning circuit is a chopper circuit and has no inductor between the rectifier circuit and the switch. ### Claim 4 (depends on 1) The power receiving device according to claim 1, wherein the control device detects the frequency of the AC power and controls the driving frequency to a value obtained by dividing the detected frequency by a natural number equal to or greater than 2.