System and method for controlling resonant wireless power source
First Claim
1. A resonant power source comprising:
- a source circuit that includes a source coil, an ac driver with a first resistance, representing an equivalent output impedance of the ac driver, and a matching network;
a current probe that measures a magnitude signal of an instantaneous source coil current;
an amplifier that receives and compares the magnitude signal and a target signal, and produces an error signal proportional to the difference; and
a compensation filter that receives the error signal and produces a control voltage that determines an ac driver voltage of the ac driver,wherein the current probe further measures a phase of the instantaneous source coil current, and the resonant power source further comprises;
a voltage probe that measures a phase of the ac driver voltage; and
a phase detector that receives and compares the phase of the instantaneous source coil current and the phase of the ac driver voltage, and produces an output signal proportional to a phase difference between the phase of the instantaneous source coil current and the phase of the ac driver voltage,wherein an impedance of a variable element in the source circuit is determined according to the output signal.
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Accused Products
Abstract
A resonant wireless power system includes a source circuit having a source coil, an ac driver with a first resistance, representing the equivalent output impedance of the ac driver, and a matching network. A current probe measures the magnitude signal of the instantaneous source coil current. A voltage probe measures the instantaneous ac driver voltage. A phase detector compares the phase of the instantaneous source coil current and the instantaneous ac driver voltage, and produces a first output signal proportional to the phase difference. A first amplifier compares the magnitude signal and a target signal, and produces an error signal proportional to the difference. A first compensation filter produces the control voltage that determines the ac driver supply voltage. A second amplifier amplifies the first output signal. A second compensation filter produces the control voltage that determines the impedance of a variable element in the source circuit.
13 Citations
19 Claims
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1. A resonant power source comprising:
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a source circuit that includes a source coil, an ac driver with a first resistance, representing an equivalent output impedance of the ac driver, and a matching network; a current probe that measures a magnitude signal of an instantaneous source coil current; an amplifier that receives and compares the magnitude signal and a target signal, and produces an error signal proportional to the difference; and a compensation filter that receives the error signal and produces a control voltage that determines an ac driver voltage of the ac driver, wherein the current probe further measures a phase of the instantaneous source coil current, and the resonant power source further comprises; a voltage probe that measures a phase of the ac driver voltage; and a phase detector that receives and compares the phase of the instantaneous source coil current and the phase of the ac driver voltage, and produces an output signal proportional to a phase difference between the phase of the instantaneous source coil current and the phase of the ac driver voltage, wherein an impedance of a variable element in the source circuit is determined according to the output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A resonant power source comprising:
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a source circuit that includes a source coil, an ac driver with a first resistance, representing an equivalent output impedance of the ac driver, and a matching network, wherein the ac driver is a class-D amplifier or a class-E amplifier and wherein the source circuit increases an ac driver voltage when an impedance seen by the ac driver increases; a current probe that measures a phase of an instantaneous source coil current; a voltage probe that measures a phase of an ac driver voltage of the ac driver; a phase detector that receives and compares the phase of the instantaneous source coil current and the instantaneous ac driver voltage, and produces a first output signal proportional to the phase difference; an amplifier that receives and amplifies the first output signal, and produces an amplified signal; and a compensation filter that receives the amplified signal and produces a control voltage that determines an impedance of a variable element in the source circuit. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A resonant power source comprising:
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a source circuit that comprises a source coil, an ac driver with an output current and an output voltage of constant magnitude, and a matching network coupled to the ac driver and the source coil; a current probe that measures a magnitude of a source coil current and measures a phase of the source coil current; a controller configured to adjust an impedance of the matching network such that the magnitude of the source coil current approaches a target value, a voltage probe that measures a phase of the output voltage of the AC driver; and a phase detector that receives and compares the phase of the source coil current and the phase of the output voltage of the AC driver, and produces an output signal proportional to a difference between the phase of the source coil current and the phase of the output voltage of the AC driver, wherein an impedance of a variable element in the source circuit is adjusted according to the output signal to reduce a difference between the phase of the source coil current and the phase of the output voltage of the AC driver. - View Dependent Claims (19)
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Specification