DYNAMIC ADJUSTMENT OF POWER FOR WIRELESS POWER TRANSFER
First Claim
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1. An apparatus for wireless power transfer comprising:
- a resonator circuit configured to couple to an externally generated magnetic field and to generate a time varying signal in response to the externally generated magnetic field;
a rectifier circuit electrically connected to the resonator circuit, the rectifier circuit having an output and configured to produce from the time varying signal of the resonator circuit a DC signal at the output of the rectifier circuit;
a variable impedance circuit electrically connected as an electrical load to the output of the rectifier circuit; and
a control circuit electrically connected to the rectifier circuit and configured to produce a control signal based on an electrical characteristic of the DC signal produced at the output of the rectifier circuit,the variable impedance circuit electrically connected to the control circuit and configured to change an impedance of the variable impedance circuit in response to the control signal of the control circuit.
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Abstract
An apparatus for wireless power transfer may include a resonator circuit configured to couple to an externally generated magnetic field to produce an AC current. A rectifier circuit may be configured to produce a DC signal from the AC current. A variable impedance circuit may be electrically connected as an electrical load to an output of the rectifier circuit. A control circuit may be configured to produce a control signal based on an electrical characteristic of the DC signal produced at the output of the rectifier circuit. The variable impedance circuit may be configured to change its impedance in response to the control signal of the control circuit.
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Citations
20 Claims
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1. An apparatus for wireless power transfer comprising:
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a resonator circuit configured to couple to an externally generated magnetic field and to generate a time varying signal in response to the externally generated magnetic field; a rectifier circuit electrically connected to the resonator circuit, the rectifier circuit having an output and configured to produce from the time varying signal of the resonator circuit a DC signal at the output of the rectifier circuit; a variable impedance circuit electrically connected as an electrical load to the output of the rectifier circuit; and a control circuit electrically connected to the rectifier circuit and configured to produce a control signal based on an electrical characteristic of the DC signal produced at the output of the rectifier circuit, the variable impedance circuit electrically connected to the control circuit and configured to change an impedance of the variable impedance circuit in response to the control signal of the control circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for wireless power transfer comprising:
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coupling to an externally generated magnetic field to produce a time varying signal; producing from the time varying signal a DC signal at an output of a circuit; sensing an electrical characteristic of the DC signal produced at the output of the circuit; generating a control signal in response to the electrical characteristic sensed; and varying an impedance of a load electrically connected to the output of the circuit in response to the control signal generated. - View Dependent Claims (12, 13, 14, 15, 16)
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17. An apparatus for wireless power transfer comprising:
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a resonator circuit configured to generate a magnetic field that can couple to an external circuit for wireless transmission of power to the external circuit; a power circuit electrically connected to the resonator circuit and configured to provide power to the resonator circuit to generate the magnetic field; a sense circuit electrically connected to one or more of the resonator circuit or the power circuit and configured to sense one or more of a voltage level in the resonator circuit, a current flow in the resonator circuit, or a current flow in the power circuit; and a controller electrically connected to the power circuit and configured to control the power circuit to vary the power provided to the resonator circuit in response to an indication that a predetermined voltage condition exists at an output of the external circuit, the indication being based on a parameter sensed by the sense circuit including one or more of a sensed voltage level in the resonator circuit, a sensed current flow in the resonator circuit, or a sensed current flow in the power circuit. - View Dependent Claims (18, 19, 20)
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Specification