TUNABLE WIRELESS ENERGY TRANSFER SYSTEMS
First Claim
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1. In a system adapted for wireless power transfer, a tunable resonant amplifier circuit for driving an inductive load having a varying impedance, the circuit comprising:
- a switching amplifier with a variable duty cycle;
an inductive load;
a connection between the inductive load and the switching amplifier, the connection including at least one tunable component; and
a feedback loop for adjusting the at least one tunable component and the duty cycle of the amplifier;
wherein the feedback loop adjusts the duty cycle of the amplifier and the at least one tunable component to maintain substantially zero voltage switching and zero current switching at the output of the amplifier under different load conditions of the inductive load.
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Abstract
Described herein are improved configurations for a wireless power transfer. A power source for driving a resonator includes a switching amplifier. The duty cycle of the switching amplifier may be adjusted as well as optionally inductors and/or capacitors of the circuit to improve the efficiency of power transfer from the power source to the resonators when the parameters of the resonant load change.
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Citations
18 Claims
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1. In a system adapted for wireless power transfer, a tunable resonant amplifier circuit for driving an inductive load having a varying impedance, the circuit comprising:
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a switching amplifier with a variable duty cycle; an inductive load; a connection between the inductive load and the switching amplifier, the connection including at least one tunable component; and a feedback loop for adjusting the at least one tunable component and the duty cycle of the amplifier; wherein the feedback loop adjusts the duty cycle of the amplifier and the at least one tunable component to maintain substantially zero voltage switching and zero current switching at the output of the amplifier under different load conditions of the inductive load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of tuning a resonant amplifier circuit in a wireless power transfer facility that includes a connection between a switching amplifier and an inductive load having a varying impedance, the method comprising the steps of:
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measuring a number of parameters at an output of the switching amplifier; adjusting a duty cycle of the switching amplifier; and adjusting at least one tunable component in the connection between the switching amplifier and the inductive load; wherein adjusting the duty cycle of the switching amplifier and adjusting at least one tunable component are controlled to maintain a substantially zero voltage switching and a substantially zero current switching at the output of the switching amplifier under different load conditions of the inductive load. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification