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WIRELESS POWER FEEDER AND WIRELESS POWER TRANSMISSION SYSTEM

  • US 20110049997A1
  • Filed: 09/02/2010
  • Published: 03/03/2011
  • Est. Priority Date: 09/03/2009
  • Status: Abandoned Application
First Claim
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1. A wireless power feeder for feeding power by wireless from a feeding coil to a receiving coil at the resonance frequency of the feeding coil and receiving coil, comprising:

  • a power circuit;

    the feeding coil;

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

    a phase detection circuit that detects the phase difference between the voltage phase and current phase of the AC power fed from the power circuit, whereinthe power 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, andthe phase detection circuit measures the phase of current passing through both or one of the first and second switches to achieve measurement of the current phase of the AC power.

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