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WIRELESS POWER FEEDER, WIRELESS POWER RECEIVER, AND WIRELESS POWER TRANSMISSION SYSTEM

  • US 20110227420A1
  • Filed: 03/18/2011
  • Published: 09/22/2011
  • Est. Priority Date: 03/19/2010
  • Status: Active Grant
First Claim
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1. A wireless power feeder that feeds power from a power feeding coil to a power receiving coil by wireless using a magnetic field resonance phenomenon between the power feeding coil and power receiving coil, said feeder comprising:

  • the power feeding coil;

    a power transmission control circuit that feeds AC power to the power feeding coil at a drive frequency so as to make the power feeding coil feed the AC power to the power receiving coil;

    a phase detection circuit that detects a phase difference between voltage and current phases of the AC power;

    a signal receiving coil that receives, from the AC power receiving side, an output signal indicating an output level by a duty ratio; and

    a signal adjustment circuit that DC-converts the output signal in accordance with the duty ratio,the power transmission control circuit adjusting the drive frequency so as to reduce the phase difference,the phase detection circuit performing ex-post adjustment of the detected value of both or one of the voltage and current phases in accordance with the signal level of the DC-converted output signal.

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