| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide magnetic field resonance type wireless power supply capable of stabilizing a load voltage. <P>SOLUTION: Electric power is transmitted from a power supply coil L2 to a power reception coil L3 by magnetic resonance. VCO202 alternately turns on and off a switching transistor Q<SB POS="POST">1</SB>and a switching transistor Q<SB POS="POST">2</SB>at a drive frequency fo to supply AC power to the power supply coil L2 and to supply AC power from the power supply coil L2 to the power reception coil L3. A phase detection circuit 114 detects a phase difference between a current phase and a voltage phase and VCO202 adjusts the drive frequency fo so that the phase difference is zero. When a load voltage changes, a detection value of the voltage phase is adjusted, so that the drive frequency fo is adjusted. <P>COPYRIGHT: (C)2012,JPO&INPIT |
