Patent ID: 9620995
Date: 2017-04-11
CPC Classifications: H02J

Claim:
1. A wireless power transmission apparatus comprising: a transmitting antenna configured to magnetically couple and resonate with a receiving antenna included in a power receiving apparatus at a resonant frequency (f a control circuit configured to control a transmission frequency according to a magnitude of electric power to be transmitted from the transmitting antenna to the receiving antenna, a first magnitude of electric power associated with the maximum transmission frequency (ftrmax) being higher than a second magnitude of electric power associated with the resonant frequency (f wherein if the magnitude of the electric power to be transmitted is greater than the second magnitude, the control circuit selects the transmission frequency within a second frequency range extending from the resonant frequency (f wherein if the magnitude of the electric power to be transmitted is smaller than the second magnitude, the control circuit selects the transmission frequency within a third frequency range extending from the minimum transmission frequency (ftrmin) to the resonant frequency (f wherein when the transmitting antenna magnetically couples and resonates with the receive antenna at the resonant frequency f wherein the split resonant frequency (fL) is lower than the transmission frequency (ftrmin) and the split resonant frequency (fH) is higher than the transmission frequency (ftrmax).