| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To stabilize a load voltage in wireless power supply of a magnetic field resonance type. <P>SOLUTION: Power is supplied 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 switching transistors Q<SB>1</SB>and Q<SB>2</SB>at a drive frequency fo, thereby 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 such that the phase difference becomes zero. When a load voltage is changed, the detected current phase value is adjusted with the results that the drive frequency fo is adjusted. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
