Patent ID: 7817742

Claim:
A power supply apparatus comprising: a radio frequency signal oscillator for oscillating a radio frequency signal; a modulator for carrying out pulse modulation of the radio frequency signal oscillated by said radio frequency signal oscillator, and for outputting a pulse signal; a unit for instructing a selection of either the radio frequency signal or the pulse signal; an amplifier for amplifying either the radio frequency signal oscillated by said radio frequency signal oscillator or the pulse signal output from said modulator according to the selection; and a transmitting device for transmitting the one of the radio frequency signal or pulse signal which is amplified by said amplifier to an external device, wherein said radio frequency signal is selected for amplification by the amplifier when the transmitted signal is to provide a power supply to the external device, and said pulse signal is selected for amplification by the amplifier when the transmitted signal is to provide data to the external device, and said amplifier operates in a manner that a peak power of the signal output by the amplifier becomes greater when the radio frequency signal is amplified than when the pulse signal is amplified.