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Coupled-coil power control for inductive power transfer systems

  • US 10,020,687 B2
  • Filed: 01/22/2015
  • Issued: 07/10/2018
  • Est. Priority Date: 01/22/2014
  • Status: Active Grant
First Claim
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1. An inductive power transfer device including:

  • a resonant circuit, having a power transfer coil and a power transfer capacitor;

    a coupling coil, magnetically-coupled to the power transfer coil;

    a variable impedance; and

    a controller configured to determine the impedance value of the variable impedance based on predetermined criteria including;

    substantially regulating power provided to a load;

    tuning the resonant circuit resonant frequency substantially to a predetermined frequency;

    adjusting a frequency of a magnetic field associated with the power transfer coil; and

    /oradjusting an impedance reflected by the power transfer coil to a corresponding coupled power transfer coil.

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