Patent ID: 8933583
Filing Date: 2015-01-13
Classification: H02J

Abstract:
1. A wireless power supply system, comprising: a wireless power transmitting device configured to include a variable resonant circuit including a power transmitting coil and having a variable-controllable resonant frequency characteristic, and to transmit electric power wirelessly via the variable resonant circuit; an electromagnetic induction coil, which is included in the wireless power transmitting device, configured to separate from the power transmitting coil by physical distance; a plurality of wireless power receiving devices configured to include respective unique resonant circuits having respective unique resonant frequency characteristics which are different to each other, and to wirelessly receive electric power from the power transmitting coil by a magnetic field resonance mode arising as a result of the unique resonant circuit tuning to a resonant frequency of the variable resonant circuit; and a communication unit configured to receive information of a resonant frequency transmitted from at least one of the plurality of wireless power receiving devices, and to transmit the received information of the resonant frequency to a power transmission control unit, wherein the power transmission control unit is configured to variably control the resonant frequency characteristic of the variable resonant circuit by transmitting alternating current power which matches a unique resonant frequency of the at least one of the plurality of wireless power receiving devices from the electromagnetic induction coil to the power transmitting coil by an electromagnetic induction according to the information of the resonant frequency transmitted from the communication unit.