Patent ID: 11901741
Assignee: DENSO CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B | IPC H

Claim 0:
1. A wireless power transfer system configured to wirelessly supply power from a power supplying device to a power receiving device, wherein
the power supplying device includes:
a power transmission circuit configured to transmit AC power, and
a power transmission resonance circuit configured to include a power transmission coil,
the power receiving device includes a power reception resonance circuit including a power reception coil,
in a state where a coupling coefficient between the power transmission coil and the power reception coil is a predetermined coupling coefficient, resonance of a first resonance mode and resonance of a second resonance mode are generated in the power transmission resonance circuit and the power reception resonance circuit, and the first resonance mode has a first resonance frequency and the second resonance mode has a second resonance frequency, the second resonance frequency being higher than the first resonance frequency,
a resonance frequency of the power transmission resonance circuit and the power reception resonance circuit is set to a value which is one of the first resonance frequency and the second resonance frequency, and the set value is a frequency which deviates from a reference resonance frequency of the power transmission resonance circuit alone by a predetermined deviation frequency or more, and
a driving frequency of the AC power is set to the set value which is one of the first and second resonance frequencies and is set as the resonance frequency of the power transmission resonance circuit and the power reception resonance circuit.