# US 10,873,219 B2 · Contactless power supply device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,873,219 B2 - Document ID: US10873219B2 - Status: Granted - Kind: B2 - Application number: 16/337,496 - Filed: 2016-09-30 - Published: 2019-09-19 - Granted: 2020-12-22 - Earliest claimed: 2016-09-30 - Assignees: Fuji Corporation - Applicants: Fuji Corporation - Inventors: Shinichi Kato; Takeshi Nomura; Masayuki Oki - Web page: https://patentgrep.com/patent/US10873219B2 ## CPC - H02J 50/12: of the resonant type - B60L 5/005: {without mechanical contact between the collector and the power supply line} - H02J 7/62: against overcurrent - H02J 7/64: against overvoltage - H02M 3/156: with automatic control of output voltage or current, e.g. switching regulators - H02M 7/12: using discharge tubes with control electrode or semiconductor devices with control electrode - 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) ## Abstract Contactless power supply device of the present invention includes: contactless power supply section that supplies AC power in a contactless manner; contactless power receiving section that receives the AC power in a contactless manner; first DC transformer circuit that transforms, to DC load voltage, DC reception-power voltage obtained from the contactless power receiving section and supplies the DC load voltage to first electric load, and that has a reverse transfer function of transferring regenerative power generated by the first electric load in a reverse direction; and second DC transformer circuit that transforms the DC reception-power voltage to DC load voltage and supplies the DC load voltage to second electric load. Accordingly, the generated regenerative power is allocated and made available to the other electric load, and a power storage section is not necessary, which suppresses an increase in the weight and size of the power-receiving-side device. ## Claims ### Claim 1 A contactless power supply device, comprising: a contactless power supply section configured to supply AC power in a contactless manner; a contactless power receiving section disposed so as to face the contactless power supply section and configured to receive the AC power in a contactless manner; a first DC transformer circuit configured to transform, to a DC load voltage, a DC reception-power voltage obtained by converting an AC voltage of the AC power received by the contactless power receiving section and supply the DC load voltage to a first electric load, and to have a reverse transfer function of transferring regenerative power generated by the first electric load in a reverse direction; and a second DC transformer circuit configured to transform the DC reception-power voltage to a DC load voltage and supply the DC load voltage to a second electric load, wherein the contactless power supply device includes a smoothing capacitor, and the contactless power supply device is configured such that but for the smoothing capacitor, regenerative power generated by the first electric load is allocated and made available to the second electric load without storing the regenerative power in a battery or charge capacitor as a power storage section. ### Claim 2 (depends on 1) The contactless power supply device according to claim 1, further comprising a rectifying-smoothing circuit configured to rectify and smooth the AC voltage of the AC power received by the contactless power receiving section, thereby converting the AC voltage to the DC reception-power voltage, wherein the smoothing capacitor forms part of the rectifying-smoothing circuit, the first DC transformer circuit is a first DC step-down circuit configured to lower the DC reception-power voltage to the DC load voltage and supply the DC load voltage to the first electric load, and the second DC transformer circuit is a second DC step-down circuit configured to lower the DC reception-power voltage to the DC load voltage and supply the DC load voltage to the second electric load. ### Claim 3 (depends on 2) The contactless power supply device according to claim 2, wherein the first DC step-down circuit and the second DC step-down circuit are connected in parallel to an output side of the rectifying-smoothing circuit, and the regenerative power generated by the first electric load is transferred via the first DC step-down circuit and the second DC step-down circuit and consumed by the second electric load. ### Claim 4 (depends on 2) The contactless power supply device according to claim 2, wherein the rectifying-smoothing circuit has a positive-side terminal and a negative-side terminal from which the DC reception-power voltage is output, and the first DC step-down circuit includes a high-side switching element having a first terminal connected to the positive-side terminal and a second terminal connected to an intermediate point, a low-side switching element having a first terminal connected to the intermediate point and a second terminal connected to the negative-side terminal and one end of the first electric load, a choke coil connected between the intermediate point and the other end of the first electric load, and a step-down-side capacitor connected in parallel to the first electric load. ### Claim 5 (depends on 1) The contactless power supply device according to claim 1, further comprising: an overvoltage detection section configured to generate an overvoltage detection signal while the DC reception-power voltage exceeds a predetermined threshold voltage used to determine an overvoltage in a case in which the DC reception-power voltage rises by the first DC transformer circuit transferring the regenerative power in the reverse direction; and an overvoltage protection section configured to change a reception-power feature of the contactless power receiving section when the overvoltage detection signal is generated, thereby reducing the AC power that is received or cutting the AC power that is received to zero. ### Claim 6 (depends on 5) The contactless power supply device according to claim 5, wherein the contactless power receiving section has a power receiving element and a power-receiving-side resonant element connected in parallel to the power receiving element, and the overvoltage protection section is a protection switch configured to disconnect the power-receiving-side resonant element when the overvoltage detection signal is generated. ### Claim 7 (depends on 5) The contactless power supply device according to claim 5, further comprising a power-supply-side protection section configured to detect the AC power supplied from the contactless power supply section changing for more than a predetermined period due to operating of the overvoltage protection section and stop the contactless power supply section. ### Claim 8 (depends on 7) The contactless power supply device according to claim 7, wherein the contactless power supply section has a power supply element and an AC power source configured to apply an AC voltage to the power supply element, and the power-supply-side protection section is a current detection protection circuit configured to stop the AC power source when an AC current flowing through the power supply element changes for more than the predetermined period due to operating of the overvoltage protection section. ### Claim 9 (depends on 1) The contactless power supply device according to claim 1, wherein the first electric load includes a servo amplifier and a servo motor. ### Claim 10 (depends on 9) The contactless power supply device according to claim 9, wherein the second electric load is an electronic control device. ### Claim 11 (depends on 1) The contactless power supply device according to claim 1, wherein the contactless power supply section includes a power supply side resonant element, the contactless power receiving section includes a power receiving side resonant element, and but for the power supply side resonant element, the power receiving side resonant element, and the smoothing capacitor, the contactless power supply device does not include the power storage section upstream of the first DC transformer circuit and the second DC transformer circuit. ### Claim 12 (depends on 1) The contactless power supply device according to claim 1, wherein the contactless power receiving section includes a power receiving side resonant element, and but for the power receiving side resonant element and the smoothing capacitor, the contactless power receiving section does not include the power storage section upstream of the first DC transformer circuit and the second DC transformer circuit.