Power receiving unit reflected reactance and tuning methods
First Claim
1. An apparatus for providing a desired output from a power receiving unit in a wireless power transfer system, comprising:
- a resonant network including a variable reactance element, wherein the resonant network is configured to resonate when the variable reactance element is at a resonant reactance value;
a control circuit operably coupled to the variable reactance element and configured to;
determine a first reactance value and a second reactance value, wherein an output of the power receiving unit is the desired output when the variable reactance element is either the first reactance value or the second reactance value, and the first reactance value is below the resonant reactance value and the second reactance value is above the resonant reactance value;
determine an indication of a source reactance associated with a wireless power source; and
adjust the variable reactance element to either the first reactance value or the second reactance value based on the indication of the source reactance.
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Accused Products
Abstract
Techniques for reducing reflected reactance in a wireless power transfer system are provided. An example apparatus includes a resonant network including a variable reactance element, such that the resonant network is configured to resonant when the variable reactance element is at a resonant reactance value, a control circuit operably coupled to the variable reactance element and configured to determine a first reactance value and a second reactance value, such that an output of the PRU is the desired output when the variable reactance element is either the first reactance value or the second reactance value, and the first reactance value is below the resonant reactance value and the second reactance value is above the resonant reactance value, determine an indication of a source reactance associated with a wireless power source, and adjust the variable reactance element to either the first reactance value or the second reactance value based on the indication of the source reactance.
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Citations
30 Claims
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1. An apparatus for providing a desired output from a power receiving unit in a wireless power transfer system, comprising:
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a resonant network including a variable reactance element, wherein the resonant network is configured to resonate when the variable reactance element is at a resonant reactance value; a control circuit operably coupled to the variable reactance element and configured to; determine a first reactance value and a second reactance value, wherein an output of the power receiving unit is the desired output when the variable reactance element is either the first reactance value or the second reactance value, and the first reactance value is below the resonant reactance value and the second reactance value is above the resonant reactance value; determine an indication of a source reactance associated with a wireless power source; and adjust the variable reactance element to either the first reactance value or the second reactance value based on the indication of the source reactance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of reducing reflected reactance in a wireless power transfer system, comprising:
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regulating an output of a power receiving unit, wherein the power receiving unit includes a resonant circuit and the output is regulated to a desired output based on a variable reactance element in the resonant circuit; determining a first reactance value and a second reactance value, wherein the output of the power receiving unit is the desired output when the variable reactance element is either the first reactance value or the second reactance value, and the first reactance value is below a resonant reactance value and the second reactance value is above the resonant reactance value; determining an indication of a source reactance associated with a wireless power source; and adjusting the variable reactance element to either the first reactance value or the second reactance value based on the indication of the source reactance. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. An apparatus for reducing reflected reactance in a wireless power transfer system, comprising:
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means for varying a reactance of a power receiving unit, means for determining a first reactance value and a second reactance value, wherein an output of the power receiving unit is a desired output when the reactance of the power receiving unit is either the first reactance value or the second reactance value, and the first reactance value is below a resonant reactance value and the second reactance value is above the resonant reactance value; means for determining an indication of a source reactance associated with a wireless power source; and means for adjusting the reactance of the power receiving unit to either the first reactance value or the second reactance value based on the indication of the source reactance.
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28. A non-transitory processor-readable storage medium comprising processor-readable instructions configured to cause at least one processor to reduce reflected reactance in a wireless power transfer system, comprising:
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code for regulating an output of a power receiving unit, wherein the power receiving unit includes a resonant circuit and the output is regulated to a desired output based on a variable reactance element in the resonant circuit; code for determining a first reactance value and a second reactance value, wherein the output of the power receiving unit is the desired output when the variable reactance element is either the first reactance value or the second reactance value, and the first reactance value is below a resonant reactance value and the second reactance value is above the resonant reactance value; code for determining an indication of a source reactance associated with a wireless power source; and code for adjusting the variable reactance element to either the first reactance value or the second reactance value based on the indication of the source reactance. - View Dependent Claims (29, 30)
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Specification