Tunable wireless energy transfer systems

  • US 10,218,224 B2
  • Filed: 04/21/2016
  • Issued: 02/26/2019
  • Est. Priority Date: 09/27/2008
  • Status: Active Grant
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First Claim
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1. A system for wireless power transfer comprising:

  • sensing and measurement circuitry configured to process signals associated with a resonator and an impedance matching network coupled with the resonator;

    a PWM (pulse width modulation) generator configured to control a driving signal to drive the resonator through the impedance matching network, the PWM generator being coupled with at least two power transistors of an amplifier coupled with the impedance matching network to drive the resonator through the impedance matching network; and

    a controller coupled with the sensing and measurement circuitry, the controller configured to adjust operation of the PWM generator and operation of the impedance matching network based on measured signals from the sensing and measurement circuitry, including the controller being configured to control a duty cycle of the driving signal, a phase of the driving signal, or both the duty cycle and the phase of the driving signal from the PWM generator to adjust a power output level, an impedance, or both the power output level and the impedance, while maintaining a zero voltage switching condition at the amplifier.

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