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System and method for controlling resonant wireless power source

  • US 9,722,462 B2
  • Filed: 08/01/2013
  • Issued: 08/01/2017
  • Est. Priority Date: 08/03/2012
  • Status: Active Grant
First Claim
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1. A resonant power source comprising:

  • a source circuit that includes a source coil, an ac driver with a first resistance, representing an equivalent output impedance of the ac driver, and a matching network;

    a current probe that measures a magnitude signal of an instantaneous source coil current;

    an amplifier that receives and compares the magnitude signal and a target signal, and produces an error signal proportional to the difference; and

    a compensation filter that receives the error signal and produces a control voltage that determines an ac driver voltage of the ac driver,wherein the current probe further measures a phase of the instantaneous source coil current, and the resonant power source further comprises;

    a voltage probe that measures a phase of the ac driver voltage; and

    a phase detector that receives and compares the phase of the instantaneous source coil current and the phase of the ac driver voltage, and produces an output signal proportional to a phase difference between the phase of the instantaneous source coil current and the phase of the ac driver voltage,wherein an impedance of a variable element in the source circuit is determined according to the output signal.

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