ROBUST FOREIGN OBJECTS DETECTION
First Claim
Patent Images
1. A foreign object detection method for a wireless power transmitter having a matching network and transmit coil, the method comprising:
- (A) energizing the matching network and transmit coil and exciting resonance between the matching network and transmit coil;
(B) allowing the resonance to decay;
(C) measuring a temporal characteristic of the decay; and
(D) analyzing the temporal characteristic to determine whether a foreign object is coupled to an electromagnetic field generated by the transmit coil.
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Abstract
An apparatus and method for performing foreign object detection for a wireless power transmitter. A matching network and transmit coil are energized, and a resonance is excited. The resonance is allowed to decay. A temporal characteristic of the decay is measured. The temporal characteristic is analyzed to determine whether a foreign object is coupled to an electromagnetic field generated by the transmit coil.
47 Citations
26 Claims
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1. A foreign object detection method for a wireless power transmitter having a matching network and transmit coil, the method comprising:
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(A) energizing the matching network and transmit coil and exciting resonance between the matching network and transmit coil; (B) allowing the resonance to decay; (C) measuring a temporal characteristic of the decay; and (D) analyzing the temporal characteristic to determine whether a foreign object is coupled to an electromagnetic field generated by the transmit coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. At least one non-transitory computer readable storage medium having stored thereon instructions, which, when executed by a processor, perform a foreign object detection method for a wireless power transmitter having a matching network and transmit coil, the method comprising:
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(A) energizing the matching network and transmit coil and exciting resonance between the matching network and transmit coil; (B) allowing the resonance to decay; (C) measuring a temporal characteristic of the decay; and (D) analyzing the temporal characteristic to determine whether a foreign object is coupled to an electromagnetic field generated by the transmit coil.
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17. An apparatus for performing foreign object detection for a wireless power transmitter having a matching network and transmit coil, the apparatus comprising:
circuitry configured to; (A) energize the matching network and transmit coil and excite resonance between the matching network and transmit coil; (B) allow the resonance to decay; (C) measure a temporal characteristic of the decay; and (D) analyze the temporal characteristic to determine whether a foreign object is coupled to an electromagnetic field generated by the transmit coil.
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18. An apparatus for driving a wireless power transmitter and performing foreign object detection, the apparatus comprising:
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a drive circuit configured to energize a matching network and transmit coil of the wireless power transmitter, excite resonance between the matching network and transmit coil, and allow the resonance to decay; and a controller configured to control the drive circuit, measure a temporal characteristic of the decay and analyze the temporal characteristic to determine whether a foreign object is coupled to an electromagnetic field generated by the transmit coil. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
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Specification