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Power transmitting apparatus, power receiving apparatus, control apparatus, and wireless power transfer system

  • US 9,608,453 B2
  • Filed: 01/10/2013
  • Issued: 03/28/2017
  • Est. Priority Date: 03/26/2012
  • Status: Active Grant
First Claim
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1. A wireless power transfer system comprising:

  • a power transmitting apparatus including a power supply to supply AC power and a power transmitting inductor supplied with the AC power;

    a power receiving apparatus including a power receiving inductor to receive the AC power through magnetic coupling with the power transmitting inductor and an adjustment circuit to supply the AC power received by the power receiving inductor, to a load;

    a mutual coupling adjusting unit to adjust a relative position between the power receiving inductor and the power transmitting inductor; and

    a control unit to control the mutual coupling adjusting unit, based on a mutual coupling coefficient between the power receiving inductor and the power transmitting inductor;

    wherein the control unit calculates the mutual coupling coefficient based on a voltage and a current on the power receiving apparatus and a voltage and a current on the power transmitting apparatus, and controls the mutual coupling adjusting unit so that the mutual coupling coefficient falls within a predetermined range and an upper limit of the predetermined range is a value less than a maximum of the mutual coupling coefficient between the power transmitting inductor and the power receiving inductor.

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