Wireless power transmitter and wireless power transmission method

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;
• a main half-bridge inverter to which a main pulse signal is applied;
• a plurality of sub half-bridge inverters to which a first sub pulse signal or a second sub pulse signal is applied;
• at least one current sensor configured to monitor a current;
• and
• a communications and control unit configured to control the pulse signals applied to the main half-bridge inverter and sub half-bridge inverters and communicate with the wireless power receivers,
• wherein the communications and control unit is further configured to:
• discover a wireless power receiver by applying the second sub pulse signal to at least one of the sub half-bridge inverters and receive a response from the wireless power receiver,
• detect a type of the discovered wireless power receiver, the type including a resonant-type or a inductive-type, and
• transfer power to the discovered wireless power receiver by controlling the first sub pulse signal and/or the applied second sub pulse signal based on the type of the discovered wireless power receiver.