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

  • US 20120161533A1
  • Filed: 09/30/2011
  • Published: 06/28/2012
  • Est. Priority Date: 12/28/2010
  • Status: Active Grant
First Claim
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1. A wireless power feeder which performs power feed by a non-contact method to a wireless power receiver having a power receive resonance circuit including a power receive coil and a power receive capacitor,the wireless power feeder comprising:

  • a power feed coil;

    a resonance current detector which detects a resonance current of the power receive resonance circuit; and

    a control circuit which performs power feed from the power feed coil to the power receive coil, on the basis of a magnetic field resonance effect between the power feed coil and the power receive coil, by supplying AC current to the power feed coil, and which associates a frequency of the AC current with a frequency of the resonance current detected by the resonance current detector, whereinthe power feed coil does not substantially constitute a resonance circuit;

    the resonance current detector has a detection resonance circuit which includes a detection coil and a detection capacitor, and detects a resonance current of the power receive resonance circuit on the basis of a magnetic field resonance effect between the detection coil and the power receive coil;

    a winding region of the detection coil in the resonance current detector is smaller than a winding region of the power feed coil; and

    the detection coil in the resonance current detector is disposed such that the central winding axis of the detection coil forms an angle of not less than 80° and

    not more than 100°

    with respect to magnetic field vectors generated by the power feed coil.

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