| 摘要 |
<P>PROBLEM TO BE SOLVED: To detect a phase of power supply while controlling influence on power transmission efficiency in wireless power supply of magnetic field resonance type. <P>SOLUTION: Power is transmitted from a feeding coil L<SB>2</SB>to a receiving coil L<SB>3</SB>by magnetic resonance. An oscillator 202 turns on/off switching transistors Q<SB>1</SB>and Q<SB>2</SB>alternately to feed AC power to a feeding coil L<SB>2</SB>, whereby the AC power is fed from the feeding coil L<SB>2</SB>to the receiving coil L<SB>3</SB>. By an AC magnetic field generated by an AC current I<SB>S</SB>flowing in the feeding coil L<SB>2</SB>, an induced current I<SB>SS</SB>flows in a detecting coil L<SB>SS</SB>. A phase detection circuit 150 compares a phase of an AC voltage generated by the oscillator 202 and the phase of the induced current I<SB>SS</SB>, and detects a phase difference between the voltage phase and the current phase. <P>COPYRIGHT: (C)2011,JPO&INPIT |
