Foreign object detection in wireless energy transfer systems
DCFirst Claim
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1. A wireless energy transfer system with foreign object debris detection, the system comprising:
- a wireless energy transfer source comprising a source resonator configured to generate an oscillating magnetic field; and
a foreign object debris detection system comprising;
at least one magnetic field sensor; and
at least one readout circuit configured to measure one or more electrical parameters of at the at least one magnetic field sensor,wherein the at least one magnetic field sensor is positioned within the magnetic field of the wireless energy transfer system; and
wherein the foreign object debris detection system is configured to verify that foreign object debris has not moved onto or over the source resonator during generation of the oscillating magnetic field.
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Abstract
A wireless energy transfer system includes a foreign object debris detection system. The system includes at least one wireless energy transfer source configured to generate an oscillating magnetic field. The foreign object debris may be detected by at least one field gradiometer positioned in the oscillating magnetic field. The voltage of the at least one field gradiometer may be measured using readout circuitry and a feedback loop based on the readings from the gradiometers may be used to control the parameters of the wireless energy source.
718 Citations
16 Claims
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1. A wireless energy transfer system with foreign object debris detection, the system comprising:
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a wireless energy transfer source comprising a source resonator configured to generate an oscillating magnetic field; and a foreign object debris detection system comprising; at least one magnetic field sensor; and at least one readout circuit configured to measure one or more electrical parameters of at the at least one magnetic field sensor, wherein the at least one magnetic field sensor is positioned within the magnetic field of the wireless energy transfer system; and wherein the foreign object debris detection system is configured to verify that foreign object debris has not moved onto or over the source resonator during generation of the oscillating magnetic field. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of detecting foreign object debris in a wireless energy transfer system, the method comprising:
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performing a health and/or status check of a source resonator of the wireless energy transfer system; verifying that no foreign object debris has moved onto or over the source resonator; positioning a vehicle over the source resonator; verifying that no foreign object debris has moved onto or over the source resonator; generating an oscillating magnetic field using the source resonator to transfer energy wirelessly to the vehicle to charge a battery of the vehicle; and verifying that no foreign object debris has moved onto or over the source resonator during the transfer of energy.
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Specification