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WIRELESS POWER FEEDER AND WIRELESS POWER TRANSMISSION SYSTEM

  • US 20120001494A1
  • Filed: 04/05/2011
  • Published: 01/05/2012
  • Est. Priority Date: 07/02/2010
  • Status: Active Grant
First Claim
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1. A wireless power feeder that feeds power from a feeding coil to a receiving coil by wireless using a magnetic field resonance phenomenon between the feeding coil and receiving coil, said feeder comprising:

  • a power transmission control circuit;

    the feeding coil;

    an exciting coil that is magnetically coupled to the feeding coil and feeds AC power fed from the power transmission control circuit to the feeding coil;

    a phase detection circuit that detects the phase difference between the voltage phase and current phase of the AC power and generates a phase difference indicating voltage in accordance with the magnitude of the phase difference; and

    a reset circuit that is connected to a voltage line to which the phase difference indicating voltage is fed so as to reduce the phase difference indicating voltage, whereinthe transmission power control circuit includes first and second current paths and makes first and second switches connected in series respectively to the first and second current paths alternately conductive to feed the AC power to the exciting coil,the phase difference indicating voltage output from the phase detection circuit is input to the power transmission control circuit,the power transmission control circuit adjusts the drive frequency so as to reduce the phase difference according to the phase difference indicating voltage, andthe reset circuit reduces the phase difference indicating voltage when the phase difference indicating voltage exceeds a predetermined threshold.

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