• US 20110193416A1
  • Filed: 01/06/2011
  • Published: 08/11/2011
  • Est. Priority Date: 09/27/2008
  • Status: Active Grant
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First Claim
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1. In a system adapted for wireless power transfer, a tunable resonant amplifier circuit for driving an inductive load having a varying impedance, the circuit comprising:

  • a switching amplifier with a variable duty cycle;

    an inductive load;

    a connection between the inductive load and the switching amplifier, the connection including at least one tunable component; and

    a feedback loop for adjusting the at least one tunable component and the duty cycle of the amplifier;

    wherein the feedback loop adjusts the duty cycle of the amplifier and the at least one tunable component to maintain substantially zero voltage switching and zero current switching at the output of the amplifier under different load conditions of the inductive load.

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