POWER TRANSMITTER AND POWER RECEIVER FOR AN INDUCTIVE POWER SYSTEM

A wireless inductive power transfer system comprises a power transmitter for transmitting power inductively to a power receiver via transmitter coil to receiver coil . In the system, a communication method comprises a step of transmitting, by the power receiver, first data and second data to the power transmitter, the first data indicating a modulation requirement, and the second data indicating an inquiry message; a step for receiving, by the power transmitter, the first data and the second data from the power receiver; a step for transmitting, by the power transmitter, a response message for responding to said inquiry message, by modulating a power signal according to said modulation requirement so as to carry the response message; and a step for receiving the response message by the power receiver by demodulating the modulated power signal carrying the response message received via the receiver coil from the power transmitter.