Tunable wireless energy transfer systems

  • US 8,643,326 B2
  • Filed: 01/06/2011
  • Issued: 02/04/2014
  • 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, frequency and bus voltage;

    an inductive load wirelessly coupled to at least one magnetic resonator;

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

    a processing unit, comprising a wireless communications controller, used to control the at least one tunable component and the duty cycle of the amplifier;

    wherein the processing unit adjusts the duty cycle of the amplifier and the at least one tunable component to maintain low loss operation of the amplifier, and to provide adequate power to the at least one magnetic resonator wirelessly coupled to the inductive load.

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