Dynamic tuning in wireless energy transfer systems
First Claim
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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Accused Products
Abstract
Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for dynamically tuning circuit elements. One aspect includes a variable capacitance device. The device includes a first capacitor, a first switch, a second capacitor, a second switch, and control circuitry. The control circuitry is configured to adjust respective capacitances of the first and second capacitors by causing a first control signal to be applied to the first-switch control terminal for a duration of time in response to detecting a zero voltage condition across the first switch, and by causing a second control signal to be applied to the second-switch control terminal for the duration of time in response to detecting a zero voltage condition across the second switch.
724 Citations
18 Claims
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1. A variable capacitance device comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A wireless energy transfer system comprising:
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a split coil resonator comprising a first winding magnetically coupled with a second winding, wherein the first winding comprises a first-winding terminal and a third-winding terminal, and wherein the second winding comprises a second-winding terminal and fourth-winding terminal; a fixed impedance matching network coupled with the third-winding terminal of the first winding and the fourth-winding terminal of the second winding; and 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, and the first-capacitor second terminal electrically connected to a first-winding terminal of the first winding of the split coil resonator; 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 second capacitor comprising a second-capacitor first terminal and a second-capacitor second terminal, the second-capacitor first terminal electrically connected to the ground, and the second-capacitor second terminal electrically connected to a second-winding terminal of the second winding of the split coil resonator; 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; and control circuitry coupled with the first-switch control terminal and with the second-switch control terminal, wherein the control circuitry is configured to adjust respective capacitances of the first and second capacitors by; in response to detecting a zero voltage condition across the first switch, causing 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 in response to detecting a zero voltage condition across the second switch, causing 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. - View Dependent Claims (16, 17, 18)
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Specification