| 摘要 |
<P>PROBLEM TO BE SOLVED: To efficiently control transmission power in magnetic field resonance type wireless power feeding. <P>SOLUTION: Power is fed from a feeding coil L<SB>2</SB>to a receiving coil L<SB>3</SB>by magnetic resonance. A VCO 202 alternately turns ON/OFF a switching transistors Q<SB>1</SB>and a switching transistor Q<SB>2</SB>at a drive frequency fo, whereby AC power is fed to the feeding coil L<SB>2</SB>, and then the AC power is fed from the feeding coil L<SB>2</SB>to the receiving coil L<SB>3</SB>. A phase detection circuit 114 detects a phase difference between a current phase and a voltage phase, and the VCO 202 adjusts the drive frequency fo so that the phase difference becomes zero. In a current phase detection circuit 144 and a voltage phase detection circuit 146, detection values of the current and voltage phases can be intentionally changed, respectively. <P>COPYRIGHT: (C)2011,JPO&INPIT |
