Wireless power transmitter and methods for use therewith
First Claim
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1. A wireless power transmitter comprising:
- a controller configured to respond to selection data from a processor to selectively operate in one of a plurality of modes;
a coil assembly configured to transmit a power signal to a power receiving unit of at least one wireless power client, the coil assembly comprising a first coil and a second coil configured to generate the power signal via a combined magnetic field;
a first driver configured to generate a first current signal on the first coil;
a second driver configured to generate a second current signal on the second coil, wherein, when operating in a first mode of the plurality of modes, the second current signal is generated at a first controllable phase relative to the first current signal to control the combined magnetic field; and
a matching network that includes a compensation capacitor, wherein the matching network is configured to provide impedance matching to the coil assembly, wherein the matching network further includes a current sensor configured to generate a feedback signal, wherein the feedback signal is proportional to a compensation capacitor current, and wherein the controller is configured to control the first controllable phase based on the feedback signal while operating in the first mode;
wherein, when operating in a second mode of the plurality of modes, the first coil operates at a first frequency in conjunction with a first wireless power standard and wherein the second coil operates at a second frequency in conjunction with a second wireless power standard, wherein the first wireless power standard is different from the second wireless power standard.
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Abstract
Aspects of the subject disclosure may include, for example, a wireless power transmitter that includes a coil assembly configured to transmit a power signal to a power receiving unit of at least one wireless power client. The coil assembly includes a first coil and a second coil configured to generate the power signal via a combined magnetic field. A first driver is configured to generate a first current signal on the first coil. A second driver is configured to generate a second current signal on the second coil at a first controllable phase relative to the first current signal to control the combined magnetic field. Other embodiments are disclosed.
11 Citations
20 Claims
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1. A wireless power transmitter comprising:
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a controller configured to respond to selection data from a processor to selectively operate in one of a plurality of modes; a coil assembly configured to transmit a power signal to a power receiving unit of at least one wireless power client, the coil assembly comprising a first coil and a second coil configured to generate the power signal via a combined magnetic field; a first driver configured to generate a first current signal on the first coil; a second driver configured to generate a second current signal on the second coil, wherein, when operating in a first mode of the plurality of modes, the second current signal is generated at a first controllable phase relative to the first current signal to control the combined magnetic field; and a matching network that includes a compensation capacitor, wherein the matching network is configured to provide impedance matching to the coil assembly, wherein the matching network further includes a current sensor configured to generate a feedback signal, wherein the feedback signal is proportional to a compensation capacitor current, and wherein the controller is configured to control the first controllable phase based on the feedback signal while operating in the first mode; wherein, when operating in a second mode of the plurality of modes, the first coil operates at a first frequency in conjunction with a first wireless power standard and wherein the second coil operates at a second frequency in conjunction with a second wireless power standard, wherein the first wireless power standard is different from the second wireless power standard. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A wireless power transmitter comprising:
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a controller configured to respond to selection data from a processor to selectively operate in one of a plurality of modes; a coil assembly configured to transmit a wireless power signal to a power receiving unit of at least one wireless power client having a single receiving coil, the coil assembly comprising a first coil and a second coil configured to generate the wireless power signal via a combined magnetic field received by the single receiving coil; a first driver configured to generate a first current signal on the first coil; and a second driver configured to generate a second current signal on the second coil; wherein, when operating in a first mode of the plurality of modes, the second current signal is generated at a first controllable phase relative to the first current signal to control the combined magnetic field received by the single receiving coil; wherein, when operating in a second mode of the plurality of modes, the first coil operates at a first frequency in conjunction with a first wireless power standard and wherein the second coil operates at a second frequency in conjunction with a second wireless power standard, wherein the first wireless power standard is different from the second wireless power standard; and wherein, when operating in the first mode of the plurality of modes, the controller is configured to generate a phase control signal based on a feedback signal, and to generate a first clock signal, wherein the first driver generates the first current signal based on the first clock signal; and
wherein the wireless power transmitter further comprises;a phase adjustor configured to generate a second clock signal, based on the phase control signal, at the first controllable phase relative to the first clock signal and wherein the second driver generates the second current signal based on the second clock signal. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method comprising:
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receiving selection data from a processor to selectively operate in one of a plurality of modes including a first mode of operation and a second mode of operation; generating a first current signal on a first coil of a coil assembly to generate a first component of a wireless power signal having a first magnetic field; generating a first clock signal to control a phase of the first current signal when operating in the first mode of operation; generating a second current signal on a second coil of the coil assembly, wherein, when operating in the first mode of operation, the second current signal is generated at a first controllable phase relative to the first current signal to generate a second component of the wireless power signal having a second magnetic field to control a combined magnetic field of the wireless power signal received by a coil of a power receiving unit, wherein the second current signal is generated at a first controllable phase relative to the first current signal by; generating a phase control signal at the first controllable phase, based on a feedback signal when operating in the first mode of operation; and generating a second clock signal based on the phase control signal to control a phase of the second current signal when operating in the first mode of operation; wherein, when operating in the second mode of operation, the first coil operates at a first frequency in conjunction with a first wireless power standard and wherein the second coil operates at a second frequency in conjunction with a second wireless power standard, wherein the first wireless power standard is different from the second wireless power standard. - View Dependent Claims (17, 18, 19, 20)
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Specification