ADAPTIVE BIAS CIRCUIT FOR WIRELESS POWER AMPLIFIER AND WIRELESS POWER SYSTEM COMPRISING THE SAME

摘要

An adaptive bias circuit for a wireless power amplifier and a wireless power transfer system comprising the same are disclosed. A wireless power transfer system comprises: a directional combiner to generate sampling processed output signal by sampling wireless frequency input signals; a sending part equipped with a power director to convert signals outputted through the directional combiner into DC signals and an operation amplifier to amplify DC signals transmitted through the power director to bias terminal of a power amplifier; a receiving part to receive wireless frequency output signals from the sending part and charge electricity; and a feedback controlling part to receive charge state data of the receiving part and adjust the magnitude of the wireless frequency input signals according to the charge state data, whereby efficiency of the power amplifier can be improved by adjusting a bias applied to the power amplifier.