Wireless power transmission system

A power feeding device that transmits power to a power receiving device by wireless, the power feeding device comprising:

• a 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;
• and
• a 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;
• 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 resonant circuit, based on the resonance frequencies contained in the switching pattern.

A power receiving device that receives power from a power feeding device by wireless, the power receiving device comprising:

• a transceiver that transmits and receives information to select a switching pattern containing at least a plurality of resonance frequencies and a power feeding time length of each resonance frequency, by negotiation with the power feeding device;
• a resonant circuit that generates power from an electromagnetic wave following a resonance parameter generated based on the resonance frequencies contained in the selected switching pattern;
• and
• a switch to open and close a connection between a load circuit to be connected and the resonant circuit,
• wherein the switch is controlled to connect between the resonant circuit and the load circuit upon receiving the switching pattern.