A wireless power transmitter which is capable of charging a plurality of wireless power receivers, the wireless power transmitter comprising: a plurality of coil cells (13030-1, 13030-2, 13030-N); a main half-bridge inverter to which a main pulse signal is applied; a plurality of sub half-bridge inverters (13040-1, 13040-2, 13040-N) to which a first sub pulse signal or a second sub pulse signal is applied; a current sensor configured to monitor the current of the coil cells (13030-1, 13030-2, 13030-N); and a communications and control unit configured to control the pulse signals applied to the main half-bridge inverter and sub half-bridge inverters (13040-1, 13040-2, 13040-N) and communicate with the wireless power receivers, wherein the output of the main half-bridge is connected to one end of the coil cells through the current sensor and the output of the sub half-bridge inverters (13040-1, 13040-2, 13040-N) are respectively connected to the other ends of the coil cells (13030-1, 13030-2, 13030-N), and the first sub pulse signal is a phase-inverted version of the main pulse signal and the second sub pulse signal is a phase-controlled version of the main pulse signal, wherein the communications and control unit applies the second sub pulse signal to at least one of the sub half-bridge inverters (13040-1, 13040-2, 13040-N) to discover a wireless power receiver and wherein when the wireless power receiver from which a response is received is an inductive-type wireless power receiver, the communications and control unit performs power transmission by controlling the phase of the second sub pulse signal applied to the sub half-bridge inverter and when the wireless power receiver from which the response is received is an resonant-type wireless power receiver the communications and control unit performs power transmission by applying the first sub pulse signal to the sub half-bridge inverter connected to the coil cell which has received the response from the wireless power receiver. a plurality of coil cells (13030-1, 13030-2, 13030-N); a main half-bridge inverter to which a main pulse signal is applied; a plurality of sub half-bridge inverters (13040-1, 13040-2, 13040-N) to which a first sub pulse signal or a second sub pulse signal is applied; a current sensor configured to monitor the current of the coil cells (13030-1, 13030-2, 13030-N); and a communications and control unit configured to control the pulse signals applied to the main half-bridge inverter and sub half-bridge inverters (13040-1, 13040-2, 13040-N) and communicate with the wireless power receivers, wherein the output of the main half-bridge is connected to one end of the coil cells through the current sensor and the output of the sub half-bridge inverters (13040-1, 13040-2, 13040-N) are respectively connected to the other ends of the coil cells (13030-1, 13030-2, 13030-N), and the first sub pulse signal is a phase-inverted version of the main pulse signal and the second sub pulse signal is a phase-controlled version of the main pulse signal, wherein the communications and control unit applies the second sub pulse signal to at least one of the sub half-bridge inverters (13040-1, 13040-2, 13040-N) to discover a wireless power receiver and wherein when the wireless power receiver from which a response is received is an inductive-type wireless power receiver, the communications and control unit performs power transmission by controlling the phase of the second sub pulse signal applied to the sub half-bridge inverter and when the wireless power receiver from which the response is received is an resonant-type wireless power receiver the communications and control unit performs power transmission by applying the first sub pulse signal to the sub half-bridge inverter connected to the coil cell which has received the response from the wireless power receiver.