DYNAMIC RESONANT MATCHING CIRCUIT FOR WIRELESS POWER RECEIVERS
First Claim
1. A resonant matching circuit for matching a resonant frequency of a wireless power transfer system to a frequency of a power signal, comprising:
- a switch connected in parallel with a resonant element of the wireless power transfer system; and
a controller connected to the switch and configured to detect a zero-voltage level crossing of a signal flowing through the resonant element and to close the switch for a predefined amount of time upon detection of the zero-voltage level crossing, wherein closing the switch for the predefined amount of time adds any one of an inductive value and a capacitive value to the resonant frequency of a wireless power transfer system.
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Accused Products
Abstract
A resonant matching circuit (310) for matching a resonant frequency of a wireless power transfer system to a frequency of a power signal comprises a switch (311) connected in parallel with a resonant element (302) of the wireless power transfer N system; and a controller (312) connected to the switch (311) and configured to detect a zero-voltage level crossing of a signal flowing through the resonant element (302) and to close the switch (311) for a predefined amount of time upon detection of the zero-voltage level crossing, wherein closing the switch (311) for the predefined amount of time adds any one of an inductive value and a capacitive value to the resonant frequency of a wireless power transfer system.
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Citations
15 Claims
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1. A resonant matching circuit for matching a resonant frequency of a wireless power transfer system to a frequency of a power signal, comprising:
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a switch connected in parallel with a resonant element of the wireless power transfer system; and a controller connected to the switch and configured to detect a zero-voltage level crossing of a signal flowing through the resonant element and to close the switch for a predefined amount of time upon detection of the zero-voltage level crossing, wherein closing the switch for the predefined amount of time adds any one of an inductive value and a capacitive value to the resonant frequency of a wireless power transfer system. - View Dependent Claims (2, 3, 4)
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5. A resonant matching circuit for matching a resonant frequency of a wireless power transfer system to a frequency of a power signal, comprising:
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a switch connected in series with a resonant element of the wireless power transfer system; and a controller connected to the switch and configured to detect crossing of a zero current level of a signal flowing through the resonant element and to open the switch for a predefined amount of time upon detection of the zero current level crossing, wherein opening the switch for the predefined amount of time adds any one of an inductive value and a capacitive value to the resonant frequency of a wireless power transfer system. - View Dependent Claims (6, 7, 8)
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9. A resonant matching circuit for matching a resonant frequency of a capacitive power transfer system to a frequency of a power signal, comprising:
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a switch connected in series with an inductive element of the capacitive power transfer system; and a controller connected to the switch and configured to detect crossing of a zero current level of a signal flowing through the inductive element and to open the switch for a predefined amount of time upon detection of the zero current level crossing, wherein opening the switch for the predefined amount of time adds any one of an inductive value and a capacitive value to the resonant frequency of the capacitive power transfer system, wherein the resonant frequency is a function of the inductive element, a capacitive impedance formed between receiver electrodes and transmitter electrodes of the capacitive power transfer system, and any one of the inductive value and the capacitive value. - View Dependent Claims (10)
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11. A resonant matching circuit for matching a resonant frequency of a capacitive power transfer system to a frequency of a power signal, comprising:
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a switch connected in parallel with an inductive element of the capacitive power transfer system; and a controller connected to the switch and configured to detect crossing of a zero voltage level of a signal flowing through the inductive element and to close the switch for a predefined amount of time upon detection of the zero voltage level crossing, wherein dosing the switch for the predefined amount of time adds any one of an inductive value and a capacitive value to the resonant frequency of a wireless power system, wherein the resonant frequency is a function of the inductive element, a capacitive impedance formed between receiver electrodes and transmitter electrodes of the capacitive power transfer system, and any one of the inductive value and the capacitive value. - View Dependent Claims (12, 13, 14, 15)
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Specification