Power supply means, power receiving apparatus, wireless power supplying system and a wireless transmission method

The present invention provides a power supply apparatus, power receiving apparatus method, a wireless power supply system, and a wireless power transmission. The power supply apparatus comprising: an impedance detector, a controller, a power transmitter, a variable matching circuit and the signal transmitter. The controller is configured to provide first control information and second control information based on an impedance detected by the impedance detector. The variable matching circuit of the power supply device is configured to change the variable diameter of the power feeding coil according to the first control information. Power receiving means includes a power receiver, a signal receiver and a variable matching circuit. By means of an electrical variable matching circuit is configured to change the variable diameter of the power feeding coil according to the second control information provided by the power supply device.