Dynamic tuning in wireless energy transfer systems

  • US 10,141,788 B2
  • Filed: 10/14/2016
  • Issued: 11/27/2018
  • Est. Priority Date: 10/22/2015
  • Status: Active Grant
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First Claim
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1. A variable capacitance device comprising:

  • a first capacitor comprising a first-capacitor first terminal and a first-capacitor second terminal, the first-capacitor first terminal electrically connected to a ground;

    a first switch comprising a first-switch first terminal, a first-switch second terminal, and a first-switch control terminal, the first-switch first terminal electrically connected to the first-capacitor first terminal, and the first-switch second terminal electrically connected to the first-capacitor second terminal;

    a first comparator comprising a first-comparator first input terminal electrically connected to the first-capacitor second terminal;

    a second capacitor comprising a second-capacitor first terminal and a second-capacitor second terminal, the second-capacitor first terminal electrically connected to the ground;

    a second switch comprising a second-switch first terminal, a second-switch second terminal, and a second-switch a control terminal, the second-switch first terminal electrically connected to the second-capacitor first terminal, and the second-switch second terminal electrically connected to the second-capacitor second terminal;

    a second comparator comprising a second-comparator first input terminal electrically connected to the second-capacitor second terminal; and

    control circuitry coupled with the first-switch control terminal, with the second-switch control terminal, with a first-comparator output terminal of the first comparator, and with a second-comparator output terminal of the second comparator,wherein the control circuitry is configured to adjust respective capacitances of the first and second capacitors by;

    detecting a zero voltage condition across the first switch based on an output signal of the first comparator, and, in response, cause a first control signal to be applied to the first-switch control terminal for a duration of time, wherein the first control signal causes the first switch to close; and

    detecting a zero voltage condition across the second switch based on an output signal of the second comparator, and, in response, cause a second control signal to be applied to the second-switch control terminal for the duration of time, wherein the second control signal causes the second switch to close.

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