Patent ID: 9099884
Filing Date: 2015-08-04
Classification: H01F,H02J

Abstract:
1. A method of controlling a wireless power signal in a wireless power transmission device, comprising: transmitting an object detecting signal via a transmission coil of the wireless power transmission device; receiving an object response signal in response to the object detecting signal via the transmission coil; transmitting the wireless power signal to a wireless power receiving device via the transmission coil based on the object response signal; detecting a voltage or a current of the transmission coil; detecting a movement of the wireless power receiving device by detecting change of a phase value of the voltage or the current of the transmission coil; and changing the wireless power signal if the movement of the wireless power receiving device is detected, wherein the transmission coil comprises a first transmission coil and a second transmission coil, and wherein the changing of the wireless power signal comprises: retransmitting the object detecting signal in turn via the first transmission coil and the second transmission coil; and retransmitting the wireless power signal by selecting any one of the first transmission coil and the second transmission coil based on the object response signal received in response to the object detecting signal.