RESONANCE TUNING
First Claim
1. A method, comprising:
- sweeping the frequency of an alternating current power source in a wireless power transfer device and monitoring a circuit parameter during the frequency sweep;
identifying a first local maximum and a second local maximum for the values of the circuit parameter;
ascertaining a first frequency and a second frequency corresponding to the first and second local maxima, respectively;
estimating a self-resonant frequency of a device electromagnetically coupled to the wireless power transfer device based on the first and second frequencies;
determining a value for a tuning component of the wireless power transfer device such that the self-resonant frequency of the wireless power transfer device is equal to the estimated self-resonant frequency of the electromagnetically coupled device; and
adjusting the tuning component to the determined value.
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Accused Products
Abstract
One heuristic for tuning a wireless power transfer device includes monitoring a circuit parameter while sweeping a power source frequency; identifying two frequencies related to local maxima of the circuit parameter values; estimating self-resonant frequency of an electromagnetically coupled device based on the two frequencies; determining a value for a tuning component of the wireless power transfer device such that the device self-resonant frequency equals the estimated coupled device self-resonant frequency; and adjusting the tuning component to the determined value.
Another tuning heuristic includes monitoring a circuit parameter while sweeping the power source frequency; identifying two frequencies related to two local maximum for the values of the circuit parameter; determining a desired resonance frequency for the wireless power transfer device based on stored information; and adjusting the tuning component to a value that causes the wireless power transfer device when uncoupled to operate at or near the desired resonance frequency.
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Citations
20 Claims
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1. A method, comprising:
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sweeping the frequency of an alternating current power source in a wireless power transfer device and monitoring a circuit parameter during the frequency sweep; identifying a first local maximum and a second local maximum for the values of the circuit parameter; ascertaining a first frequency and a second frequency corresponding to the first and second local maxima, respectively; estimating a self-resonant frequency of a device electromagnetically coupled to the wireless power transfer device based on the first and second frequencies; determining a value for a tuning component of the wireless power transfer device such that the self-resonant frequency of the wireless power transfer device is equal to the estimated self-resonant frequency of the electromagnetically coupled device; and adjusting the tuning component to the determined value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19)
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13. A method, comprising:
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sweeping the frequency of an alternating current power source in a coupled wireless power transfer device and monitoring a circuit parameter during the frequency sweep; identifying a first local maximum and a second local maximum for the values of the circuit parameter; ascertaining a first frequency and a second frequency corresponding to the first and second local maxima, respectively; determining a desired resonance frequency for the wireless power transfer device based on stored information relating the value of a tuning component, the value of a coupling coefficient, and the frequency of resonance modes; and adjusting the tuning component to a value that causes the wireless power transfer device when uncoupled to operate at or near the desired resonance frequency.
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20. A method, comprising:
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during production of a wireless power transfer device, performing a first heuristic comprising; sweeping the frequency of an alternating current power source in a wireless power transfer device and monitoring a circuit parameter during the frequency sweep; identifying a first local maximum and a second local maximum for the values of the circuit parameter; ascertaining a first frequency and a second frequency corresponding to the first and second local maxima, respectively; estimating a self-resonant frequency of a device electromagnetically coupled to the wireless power transfer device based on the first and second frequencies; determining a value for a tuning component of the wireless power transfer device such that the self-resonant frequency of the wireless power transfer device is equal to the estimated self-resonant frequency of the electromagnetically coupled device; and adjusting the tuning component to the determined value; and prior or during a power transfer involving the wireless power transfer device, performing a second heuristic comprising; sweeping the frequency of an alternating current power source in a coupled wireless power transfer device and monitoring a circuit parameter during the frequency sweep; identifying a first local maximum and a second local maximum for the values of the circuit parameter; ascertaining a first frequency and a second frequency corresponding to the first and second local maxima, respectively; determining a desired resonance frequency for the wireless power transfer device based on stored information relating the value of a tuning component, the value of a coupling coefficient, and the frequency of resonance modes; and adjusting the tuning component to a value that causes the wireless power transfer device when uncoupled to operate at or near the desired resonance frequency.
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Specification