Dynamic tuning in wireless energy transfer systems

  • US 10,651,689 B2
  • Filed: 11/21/2018
  • Issued: 05/12/2020
  • Est. Priority Date: 10/22/2015
  • Status: Active Grant
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First Claim
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1. A zero voltage switching device comprising:

  • a switch comprising a first terminal, a second terminal, and a control terminal;

    a first comparator comprising a first-comparator output terminal and a first-comparator first input terminal electrically connected to the first terminal of the switch;

    a second comparator comprising a second-comparator output terminal, a second-comparator first input terminal electrically connected to a first reference voltage, and a second-comparator second input terminal electrically connected to the control terminal of the switch; and

    control circuitry coupled with the first-comparator output terminal and the second-comparator output terminal, the control circuitry comprising;

    a phase detection circuit coupled with the first-comparator output terminal and the second-comparator output terminal;

    an integrator circuit coupled with the phase detection circuit;

    a third comparator comprising a third-comparator output terminal, a third-comparator first input terminal electrically connected to the first terminal of the switch, and a third-comparator second input terminal coupled with the integrator circuit;

    a flip-flop comprising a reset terminal, a clock terminal electrically connected to the third-comparator output terminal, and an output terminal electrically connected to the control terminal of the switch; and

    a controller coupled with the reset terminal of the flip-flop and configured to provide a reset signal to the flip-flop, andwherein the control circuitry is configured to;

    determine a phase difference between a first-comparator output signal and a second-comparator output signal,generate a second reference voltage based the phase difference, andcause a control signal to be applied to the control terminal of the switch upon detecting that a voltage signal at one of the first terminal or second terminal of the switch has crossed a voltage value equal to the second reference voltage.

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