Resonant power transfer system and method of estimating system state
First Claim
1. A method of tuning and controlling a wireless power system, comprising the steps of:
- measuring an impedance on a transmitter resonator;
determining a load resistance of a receiver resonator and a coupling coefficient between the transmitter and receiver resonators by deriving the load resistance and the coupling coefficient from the measured impedance using a look up table that specifies i) how a real-part of the measured impedance changes as a function of variations in the load resistance and variations in the coupling coefficient and ii) how an imaginary part of the measured impedance changes as a function of variations in the load resistance and variations in the coupling coefficient; and
adjusting a power transmission parameter of the transmitter resonator based on the determined load resistance and the coupling coefficient to achieve a controlled voltage at a load of the receiver.
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Accused Products
Abstract
Systems for tuning a wireless power transfer system are provided, which may include any number of features. In one embodiment, a wireless power transfer system can include a transmit controller connected to the transmitter resonator and configured to measure an impedance on the transmitter resonator. The transmit controller can be configured to determine a load resistance of the receiver resonator and a coupling coefficient between the transmitter and receiver resonators based on the measured impedance on the transmitter resonator. The transmit controller can be further configured to adjust a power transmission parameter of the transmitter resonator based on the determined load resistance and the coupling coefficient to achieve a controlled voltage at a load of the receiver. Methods of use are also provided.
275 Citations
16 Claims
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1. A method of tuning and controlling a wireless power system, comprising the steps of:
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measuring an impedance on a transmitter resonator; determining a load resistance of a receiver resonator and a coupling coefficient between the transmitter and receiver resonators by deriving the load resistance and the coupling coefficient from the measured impedance using a look up table that specifies i) how a real-part of the measured impedance changes as a function of variations in the load resistance and variations in the coupling coefficient and ii) how an imaginary part of the measured impedance changes as a function of variations in the load resistance and variations in the coupling coefficient; and adjusting a power transmission parameter of the transmitter resonator based on the determined load resistance and the coupling coefficient to achieve a controlled voltage at a load of the receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A wireless power system, comprising:
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a transmitter resonator configured to transmit wireless power to a receiver resonator; a transmit controller connected to the transmitter resonator and configured to measure an impedance on the transmitter resonator, the transmit controller configured to determine a load resistance of the receiver resonator and a coupling coefficient between the transmitter and receiver resonators by deriving the load resistance and the coupling coefficient from the measured impedance on the transmitter resonator using a look up table that specifies i) how a real-part of the measured impedance changes as a function of variations in the load resistance and variations in the coupling coefficient and ii) how an imaginary part of the measured impedance changes as a function of variations in the load resistance and variations in the coupling coefficient, the transmit controller further configured to adjust a power transmission parameter of the transmitter resonator based on the determined load resistance and the coupling coefficient to achieve a controlled voltage at a load of the receiver. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification