When the wireless power receiver 200 is connected to the wireless power transmitter 100, the transmission control unit 112 generates a control signal (control signal for setting to PT=0) for suspending the operation of the LC resonant circuit of the wireless power receiver 200, and transmits the control signal (control signal for setting to PT=0) to the wireless power receiver 200. The wireless power receiver 200 suspends the operation of its own LC resonant circuit based on the control signal (control signal for setting to PT=0) (set to PT=0). The transmission control unit 112 may generate a control signal for suspending the operation of the LC resonant circuit of the wireless power receiver 200 and transmit the control signal to the wireless power receiver 200 in a periodic manner or whenever a period of time set by the user has passed to detect the existence or non-existence of the external metal material 300 and/or an amount of power consumed due to the external metal material 300.
Hereinafter, a method of setting PT=0 will be described with reference to