| 摘要 |
PURPOSE: A wireless power transmission and a charging system, and a control method of impedance of wireless power transmission and a charging system are provided to reduce the loss of transmission power without using a separate matching circuit. CONSTITUTION: A power converter(114) converts AC voltage to DC voltage using resonant frequency. A source resonator(116) transmits communications electricity or charging electricity through magnetic coupling to a target device. An impedance control unit(117) changes impedance of a source resonator by tuning on/off of N matching switches. A control and communication unit(115) determine the signal level of DC voltage and the impedance of the source resonator. [Reference numerals] (114) Power converter; (115) Control and communication unit; (122) Rectifying unit; (125) Charging unit; (126) Control and communication unit |
