Patent ID: 11888326
Assignee: DENSO CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B  Y | IPC B  H

Claim 2:
3. A contactless power supply system that, by using a plurality of power transmission resonance circuits arranged in a road and a power reception resonance circuit mounted in a vehicle, supplies electric power to the vehicle in a contactless manner, the contactless power supply system comprising:
a contactless power supply device that has the plurality of power transmission resonance circuits; and
a contactless power reception device that is mounted in the vehicle, wherein:
the contactless power supply device includes:
the plurality of power transmission resonance circuits;
a power source circuit that supplies direct-current power; and
a plurality of power transmission circuits that convert the direct-current power of the power source circuit into alternating-current power and supply the alternating-current power to the plurality of power transmission resonance circuits;

the power transmission circuits each include:
an inverter circuit that converts the direct-current power of the power source circuit into alternating-current power; and
a power transmission-side immittance conversion circuit that adjusts the alternating-current power of the inverter circuit and supplies the alternating-current power to the power transmission resonance circuits,
a characteristic impedance of the power transmission-side immittance conversion circuit being ⅕ or less of an impedance backward on the power transmission resonance circuit-side from the power transmission-side immittance conversion circuit;

the contactless power reception device includes:
the power reception resonance circuit; and
a power reception circuit that converts the alternating-current power received by the power reception resonance circuit into direct-current power and supplies the direct-current power to a load; and

the power reception circuit includes:
a power reception-side immittance conversion circuit that adjusts the alternating-current power input from the power reception resonance circuit;
a rectification circuit that converts the alternating-current power input from the power reception-side immittance conversion circuit into direct-current power; and
a power conversion circuit that converts the direct-current power input from the rectification circuit into power suppliable to the load,
a characteristic impedance of the power reception-side immittance conversion circuit being ⅕ or less of an impedance forward on the power reception resonance circuit-side from the power reception-side immittance conversion circuit.