Inductive power transfer
First Claim
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1. An inductive power receiver comprising:
- inductive power receiving circuitry comprising a coil, the inductive power receiving circuitry having a resonant frequency; and
a controller configured to;
tune the resonant frequency to a first frequency;
determine a first power produced using the inductive power receiving circuitry while the resonant frequency is tuned to the first frequency;
tune the resonant frequency to a second frequency;
determine a second power produced using the inductive power receiving circuitry while the resonant frequency is tuned to the second frequency;
in accordance with a determination that the first power produced and the second power produced are within a threshold difference, tune the resonant frequency to at least one of the first frequency and the second frequency; and
in accordance with a determination that the first power produced and the second power produced are not within the threshold difference, tune the resonant frequency to a third frequency.
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Abstract
An IPT receiver is controlled to vary its frequency of operation to hop between a first frequency below the transmitter frequency and a second frequency above the transmitter frequency while measuring the power transfer at both first and second frequencies. Embodiments may track variations in transmitter frequency.
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Citations
16 Claims
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1. An inductive power receiver comprising:
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inductive power receiving circuitry comprising a coil, the inductive power receiving circuitry having a resonant frequency; and a controller configured to; tune the resonant frequency to a first frequency; determine a first power produced using the inductive power receiving circuitry while the resonant frequency is tuned to the first frequency; tune the resonant frequency to a second frequency; determine a second power produced using the inductive power receiving circuitry while the resonant frequency is tuned to the second frequency; in accordance with a determination that the first power produced and the second power produced are within a threshold difference, tune the resonant frequency to at least one of the first frequency and the second frequency; and in accordance with a determination that the first power produced and the second power produced are not within the threshold difference, tune the resonant frequency to a third frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 15)
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10. A method of operating a receiver for an inductive power transfer (IPT) system, the receiver comprising inductive power receiving circuitry having a resonant frequency, the method comprising
tuning the resonant frequency to a first frequency; -
determining a first power produced using the inductive power receiving circuitry while the resonant frequency is tuned to the first frequency; tuning the resonant frequency to a second frequency; determining a second power produced using the inductive power receiving circuitry while the resonant frequency is tuned to the second frequency; in accordance with a determination that the first power produced and the second power produced are within a threshold difference, tuning the resonant frequency to at least one of the first frequency and the second frequency; and in accordance with a determination that the first power produced and the second power produced are not within the threshold difference, tuning the resonant frequency to a third frequency. - View Dependent Claims (11, 12, 13, 14, 16)
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Specification