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Wireless power feeder, wireless power transmission system, and table and table lamp using the same

  • US 8,581,444 B2
  • Filed: 10/22/2010
  • Issued: 11/12/2013
  • Est. Priority Date: 10/30/2009
  • Status: Active Grant
First Claim
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1. A wireless power feeder for feeding power by wireless from a feeding coil to a receiving coil, comprising:

  • a power transmission control circuit that feeds AC power to the feeding coil;

    a feeding coil circuit that includes the feeding coil and a capacitor and resonates at the resonance frequency of the receiving coil; and

    a phase detection circuit that detects a phase difference between the voltage phase and current phase of the AC power, whereinthe power transmission control circuit adjusts the drive frequency of the AC power such that the phase difference is reduced so as to make the drive frequency track the resonance frequency, andin the phase difference detection circuit, a detected phase value of both or one of the voltage and current phases can be changed intentionally.

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