| 摘要 |
PURPOSE: A wireless power transmission apparatus, a wireless power receiving apparatus, a wireless power transmission system and a wireless power transmission method are provided to improve power transmission efficiency, by controlling impedance of a load terminal. CONSTITUTION: A transmission unit (210) is supplied with electricity from a power source. The transmission unit transmits the electricity with non-radiation method through a transmission resonant coil. A receiving unit (310) receives the electricity through a receiving resonant coil. The receiving resonant coil is coupled with the transmission resonant coil. An impedance changing unit (320) changes output impedance. [Reference numerals] (220) Detection unit; (330) Load control unit |
