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RESONANCE TUNING

  • US 20160141889A1
  • Filed: 11/30/2015
  • Published: 05/19/2016
  • Est. Priority Date: 12/29/2010
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • sweeping the frequency of an alternating current power source in a wireless power transfer device and monitoring a circuit parameter during the frequency sweep;

    identifying a first local maximum and a second local maximum for the values of the circuit parameter;

    ascertaining a first frequency and a second frequency corresponding to the first and second local maxima, respectively;

    estimating a self-resonant frequency of a device electromagnetically coupled to the wireless power transfer device based on the first and second frequencies;

    determining a value for a tuning component of the wireless power transfer device such that the self-resonant frequency of the wireless power transfer device is equal to the estimated self-resonant frequency of the electromagnetically coupled device; and

    adjusting the tuning component to the determined value.

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