WIRELESS POWER TRANSFER AND COMMUNICATION

There is provided a wireless power transfer system comprising a power transmitter for providing power to a power receiver via an inductive power signal which comprises a power transmitter which in turn comprises a transmitter resonant circuit comprising a power transmitting inductor having a transmission resonance at a first frequency and arranged for generating the power transfer signal, the power transmitting inductor being arranged to be magnetically couplable to a power receiver inductor n the power receiver , a power transmitter driver, operably coupled to the power transmitter resonant circuit and arranged to generate a drive signal for the power transmitting inductor,a transmitter communication resonant circuit, different from the transmitter resonant circuit and directly or capacitively coupled to the power transmitting inductor, being arranged to establish a transmitter communication resonance at a second frequency, different from the first frequency, for communications, wherein the power transmitting inductor participates in both transmission and transmitter communication resonances and wherein the transmitter and transmitter communication resonant circuits are arranged to be able to exhibit both first and second resonances simultaneously.