Delivering and negotiating wireless power delivery in a multi-receiver system
First Claim
1. A system for wireless power transfer, comprising:
- a transmitter including;
a first resonator configured to receive power from a power source and to transfer the power, the first resonator including at least a first common mode capacitor formed between a first common mode conductor and ground, the first common mode capacitor configured to generate a common mode oscillating field at a common mode resonant frequency in response to receiving the power from the power source;
a first communication interface; and
a first controller configured to control the first resonator and to communicate data via the first communication interface; and
a plurality of receivers, one of the receivers including;
a second resonator configured to be wirelessly coupled to the first resonator to receive the power from the first resonator, the second resonator including at least a second common mode capacitor formed between a second common mode conductor and ground, the second common mode capacitor configured to resonate at the common mode resonant frequency in response to the common mode oscillating field generated by the first common mode capacitor; and
a second communication interface configured to establish wireless side-channel communications with the first communication interface and to communicate the data with the first communication interface via the wireless side-channel communications,wherein the first controller is further configured to identify the one receiver from the plurality of receivers according to the data communicated via the wireless side-channel communications, and upon identifying the one receiver, the first controller is further configured to cause the first resonator to transfer the power to the second resonator,at least one of the transmitter or the one receiver includes a bidirectional RF coupler,the one receiver includes a second impedance, andthe first controller is further configured to;
(i) determine a measured response from the one receiver via the bidirectional RF coupler when the first resonator transfers the power to the second resonator, (ii) determine an expected response from a circuit model determined according to a nominal value for the second impedance for the one receiver, and (iii) identify one or more parasitic loads by comparing the measured response to the expected response.
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Accused Products
Abstract
A transmitter includes a first resonator to generate an oscillating field at a resonant frequency in response to receiving power from a power source. The transmitter includes a first communication interface and a first controller to control the first resonator and to communicate data via the first communication interface. One of a plurality of receivers includes a second resonator to be wirelessly coupled to the first resonator. The second resonator resonates at the common mode resonant frequency in response to the oscillating field. The one receiver includes a second communication interface to establish wireless side-channel communications with the first communication interface and to communicate the data with the first communication interface via the wireless side-channel communications. The first controller identifies the one receiver from the plurality of receivers according to the communicated data, and in response, the first resonator transfers the power to the second resonator.
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Citations
37 Claims
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1. A system for wireless power transfer, comprising:
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a transmitter including; a first resonator configured to receive power from a power source and to transfer the power, the first resonator including at least a first common mode capacitor formed between a first common mode conductor and ground, the first common mode capacitor configured to generate a common mode oscillating field at a common mode resonant frequency in response to receiving the power from the power source; a first communication interface; and a first controller configured to control the first resonator and to communicate data via the first communication interface; and a plurality of receivers, one of the receivers including; a second resonator configured to be wirelessly coupled to the first resonator to receive the power from the first resonator, the second resonator including at least a second common mode capacitor formed between a second common mode conductor and ground, the second common mode capacitor configured to resonate at the common mode resonant frequency in response to the common mode oscillating field generated by the first common mode capacitor; and a second communication interface configured to establish wireless side-channel communications with the first communication interface and to communicate the data with the first communication interface via the wireless side-channel communications, wherein the first controller is further configured to identify the one receiver from the plurality of receivers according to the data communicated via the wireless side-channel communications, and upon identifying the one receiver, the first controller is further configured to cause the first resonator to transfer the power to the second resonator, at least one of the transmitter or the one receiver includes a bidirectional RF coupler, the one receiver includes a second impedance, and the first controller is further configured to;
(i) determine a measured response from the one receiver via the bidirectional RF coupler when the first resonator transfers the power to the second resonator, (ii) determine an expected response from a circuit model determined according to a nominal value for the second impedance for the one receiver, and (iii) identify one or more parasitic loads by comparing the measured response to the expected response. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A transmitter for wireless power transfer, comprising:
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a first resonator configured to receive power from a power source and to transfer the power, the first resonator including at least a first common mode capacitor formed between a first common mode conductor and ground, the first common mode capacitor configured to generate a common mode oscillating field at a common mode resonant frequency in response to receiving the power from the power source, the first resonator being further configured to be wirelessly coupled to a second resonator of a receiver to provide the power to the second resonator, the second resonator including at least a second common mode capacitor formed between a second common mode conductor and ground, the second common mode capacitor configured to resonate at the common mode resonant frequency in response to the common mode oscillating field generated by the first common mode capacitor; a first communication interface configured to establish wireless side-channel communications with a second communication interface of the receiver and to communicate data with the receiver via the wireless side-channel communications; and a first controller configured to identify the receiver from a plurality of receivers according to the data communicated via the wireless side-channel communications, and upon identifying the receiver, the first controller being further configured to cause the first resonator to transfer the power to the second resonator, wherein at least one of the transmitter or the one receiver includes a bi-directional RF coupler, and the first controller is further configured to;
(i) determine a measured response from the one receiver via the bi-directional RF coupler when the first resonator transfers the power to the second resonator, (ii) determine an expected response from a circuit model determined according to a nominal value for a second impedance for the receiver, and (iii) identify one or more parasitic loads by comparing the measured response to the expected response. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A receiver for wireless power transfer, comprising:
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a second resonator configured to be wirelessly coupled to a first resonator of a transmitter to receive power from the first resonator, the first resonator including at least a first common mode capacitor formed between a first common mode conductor and ground, the first common mode capacitor configured to generate a common mode oscillating field at a common mode resonant frequency in response to receiving the power from the power source, and the second resonator including at least a second common mode capacitor formed between a second common mode conductor and ground, the second common mode capacitor configured to resonate at the common mode resonant frequency in response to the common mode oscillating field generated by the first common mode capacitor; and a second communication interface configured to establish wireless side-channel communications with a first communication interface of the transmitter and to communicate data with the transmitter via the wireless side-channel communications, wherein the data communicated via the wireless side-channel communications identifies the receiver from a plurality of receivers for transfer of the power from the first resonator to the second resonator, at least one of the transmitter or the receiver includes a bi-directional RF coupler, the receiver includes a second impedance, and the transmitter is further configured to;
(i) determine a measured response from the receiver via the bi-directional RF coupler when the first resonator transfers the power to the second resonator, (ii) determine an expected response from a circuit model determined according to a nominal value for the second impedance for the one receiver, and (iii) identify one or more parasitic loads by comparing the measured response to the expected response. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification