Resonant power transfer systems with protective algorithm
First Claim
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1. A method of operating a wireless power transfer system, said method comprising:
- determining an amount of wireless power reflected from a receive resonator to a first transmit resonator;
comparing the amount of wireless power reflected to the first transmit resonator to an expected return energy value, the expected return energy value determined based on an amount of wireless power transmitted from the first transmit resonator to the receive resonator; and
detecting a second transmit resonator when the amount of wireless power reflected to the first transmit resonator exceeds the expected return energy value.
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Abstract
Systems for tuning a wireless power transfer system are provided, which may include any number of features. In one embodiment, a TET system includes a receive resonator is adapted to be implanted in a human patient and is configured to receive wireless power from a transmit resonator. The system can include a controller configured to identify if a foreign object is interfering with the transmission of power or generating an induced voltage in the receiver resonator. The controller can also be configured to control the transmit resonator to phase match with the foreign object. Methods of use are also provided.
164 Citations
16 Claims
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1. A method of operating a wireless power transfer system, said method comprising:
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determining an amount of wireless power reflected from a receive resonator to a first transmit resonator; comparing the amount of wireless power reflected to the first transmit resonator to an expected return energy value, the expected return energy value determined based on an amount of wireless power transmitted from the first transmit resonator to the receive resonator; and detecting a second transmit resonator when the amount of wireless power reflected to the first transmit resonator exceeds the expected return energy value. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A wireless power transfer system, comprising:
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a first transmit resonator configured to transmit wireless power; a receive resonator configured to be implanted in a human patient, to receive wireless power from the first transmit resonator and a second transmit resonator, and to reflect an amount of wireless power back to the first transmit resonator; a controller coupled to the first transmit resonator and configured to; compare the amount of wireless power reflected to the first transmit resonator from the receive resonator to an expected return energy value, the expected return energy value determined based on an amount of wireless power transmitted from the first transmit resonator to the receive resonator; and detect the presence of the second transmit resonator when the amount of wireless power reflected to the first transmit resonator exceeds the expected return energy value. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method of operating a wireless power transfer system, said method comprising:
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determining a first transmit resonator is in an inactive state in which no transmission of power occurs from the first transmit resonator, the first transmit resonator operable in a first frequency band; detecting, when the first transmit resonator is in the inactive state, an amount of wireless power received by a receive resonator in the first frequency band; and detecting an interfering object is present when the amount of wireless power received by the receive resonator in the first frequency band exceeds a threshold. - View Dependent Claims (14, 15, 16)
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Specification