| 摘要 |
<P>PROBLEM TO BE SOLVED: To keep a supply power at a predetermined level even if a communication in load modulation method is performed. <P>SOLUTION: A resonance type wireless power transmission device, transmits the power of a power supply of a power transmission side device to a load of a power reception side device by utilizing the resonance phenomenon between a power transmission side resonance coil which is electrically connected by electromagnetic induction to a power transmission side coil of the power transmission side device and a power reception side resonance coil which is electrically connected by electromagnetic induction to the power reception side coil of the power reception side device. The power reception side device includes load impedance changing means which changes a load impedance within a predetermined range by opening/closing a switch, and a control part which controls opening/closing of a switch allowing the information bit that is transmitted to the power transmission side device from the power reception side device to be corresponded to the change in load impedance that accompanies opening/closing of the switch. The power transmission side device includes a demodulation part which detects a change in load impedance that corresponds to the information bit transmitted from the power reception side device, for restoring the information bit. <P>COPYRIGHT: (C)2012,JPO&INPIT |
