Adaptive control of wireless power transfer
First Claim
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1. A method for wireless power transfer using a transmitter having a plurality of transmitter coils that are magnetically coupled to one or more receiver coils, the one or more receiver coils being electrically coupled to one or more circuits wirelessly powered from the transmitter, the method comprising:
- maintaining first data characterizing an electrical effect on the transmitter by the one or more receiver coils electrically coupled to the one or more circuits;
determining second data which characterizes a periodic excitation of the plurality of transmitter coils by using the first data;
causing the periodic excitation of the plurality of the transmitter coils according to the second data;
wherein maintaining the first data includes updating the first data using third data characterizing a response of each transmitting coil to the periodic excitation applied to the plurality of transmitting coils.
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Abstract
A method for wireless power transfer adapts to changing configuration of receivers, including changes in number of, location and/or orientation of, magnetic coupling to, and load of circuits (e.g., battery charging circuits) of one or more receivers. The adaptation can be performed without interrupting optimal or near-optimal power transfer to the receivers, and can provide a measure of fairness among multiple receivers.
25 Citations
38 Claims
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1. A method for wireless power transfer using a transmitter having a plurality of transmitter coils that are magnetically coupled to one or more receiver coils, the one or more receiver coils being electrically coupled to one or more circuits wirelessly powered from the transmitter, the method comprising:
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maintaining first data characterizing an electrical effect on the transmitter by the one or more receiver coils electrically coupled to the one or more circuits; determining second data which characterizes a periodic excitation of the plurality of transmitter coils by using the first data; causing the periodic excitation of the plurality of the transmitter coils according to the second data; wherein maintaining the first data includes updating the first data using third data characterizing a response of each transmitting coil to the periodic excitation applied to the plurality of transmitting coils. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 35, 36, 37, 38)
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32. A wireless power transfer system comprising:
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a plurality of transmitter coils; one or more power conversion circuits controllable to apply an excitation to each of the plurality of transmitter coils; measurement circuits for measuring a response at each of the transmitter coils to the excitation of said transmitter coils; and a controller coupled to the power conversion circuits and to the measurement circuits, said controller being configured to maintain first data characterizing an electrical effect on the transmitter of the one or more receiver coils electrically coupled to the one or more circuits; determine second data which characterizes a periodic excitation of the plurality of transmitter coils by using the first data; cause the periodic excitation of the plurality of transmitter coils according to the second data; wherein maintaining the first data includes updating the first data using third data characterizing a response of each transmitting coil to the periodic excitation applied to the plurality of transmitting coils. - View Dependent Claims (33)
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34. A non-transitory machine readable medium comprising instructions for causing a controller of a wireless power transfer system to:
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maintain first data characterizing an electrical effect on the transmitter of the one or more receiver coils electrically coupled to the one or more circuits; determine second data which characterizes a periodic excitation of the plurality of transmitter coils by using the first data; cause the periodic excitation of the plurality of transmitter coils according to the second data; wherein maintaining the first data includes updating the first data using third data characterizing a response of each transmitting coil to the periodic excitation applied to the plurality of transmitting coils.
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Specification