System and method for preventing cross connection in wireless charging

A wireless power transmitter that supplies power to a wireless power receiver, the wireless power transmitter comprising:

• a control unit that generates an identification information of the wireless power transmitter;
• a resonator that transmits power to the wireless power receiver;
• and
• an amplifier that drives the resonator and is controlled by the control unit such that the power transmitted by the resonator includes a first signal that carries an identification information of the wireless power transmitter,
• wherein the first signal carries the identification information of the wireless power transmitter by transmitting the power from the resonator in different power levels, the power levels are predetermined and include a highest power level, a lowest power level and a number of power levels with a common difference, and
• wherein the wireless power transmitter receives a second signal from the wireless power receiver to determine whether to establish power connection with the wireless power receiver in order to prevent cross connection between the wireless power transmitter and the wireless power receiver.

A method of preventing cross connection in wireless charging between a wireless power transmitter and a wireless power receiver, the method comprising:

• generating, by a control unit of the wireless power transmitter, an identification information of the wireless power transmitter;
• sending, from a resonator of the wireless power transmitter, a first signal that includes the identification information of the wireless power transmitter by transmitting power from the resonator in different power levels;
• and
• determining, based a comparison result between the first signal and a second signal, whether to establish power connection between the wireless power transmitter and the wireless power receiver in order to prevent cross connection between the wireless power transmitter and the wireless power receiver when the wireless power receiver is not charged by the wireless power transmitter,
• wherein the power levels are predetermined and include a highest power level, a lowest power level and a number of power levels with a common difference.