Patent ID: 9287716
Filing Date: 2016-03-15
CPC Classification: H02J

Claim Text:
1. A wireless power transmission system for power transmission from a power feeding device to a power receiving device by wireless, wherein the power feeding device comprises a first transceiver that transmits and receives information to select a switching pattern from a plurality of switching patterns each containing at least a plurality of resonance frequencies and a power feeding time length of each resonance frequency, by negotiation with the power receiving device, an oscillator that generates a high frequency signal by oscillating according to an oscillation frequency determined by switching respective resonance frequencies contained in the selected switching pattern, a first resonant circuit that generates an electromagnetic wave from the high frequency signal following a resonance parameter generated based on the resonance frequencies contained in the selected switching pattern, and the power receiving device comprises a second transceiver that transmits and receives information regarding the switching pattern, by negotiation with the power feeding device, a second resonant circuit that generates power from the electromagnetic wave following the resonance parameter generated based on the resonance frequencies contained in the selected switching pattern, a switch to open and close a connection between a load circuit to be connected and the second resonant circuit, the switch being controlled to connect between the resonant circuit and the load circuit upon receiving the switching pattern, wherein the power feeding device transmits power to the power receiving device by switching the resonance parameter and the high frequency signal to be supplied to the first resonant circuit, based on the resonance frequencies contained in the switching pattern.