WIRELESS POWER TRANSMITTER AND RECEIVER

A method in which a power transmitter comprising multi coils transmits wireless power, includes detecting a second power receiver while transmitting power to a first power receiver, determining at least one primary coil appropriate for power transmission, determining whether the second power receiver supports a shared mode protocol using the determined at least one primary coil, and transmitting, if the second power receiver supports a shared mode protocol, power to the first and second power receivers according to the shared mode protocol, wherein the shared mode protocol is a protocol that simultaneously manages information exchange between the power transmitter and a plurality of power receivers.