System and method for detecting and characterizing an object for wireless charging
First Claim
Patent Images
1. A system for detecting and characterizing an object proximate to a wireless power transmitting unit, comprising:
- a transmit circuit having a transmit antenna, the transmit circuit configured to transmit at least one signal at a selectable harmonic frequency of a fundamental power transmit frequency;
the transmit circuit configured to measure a response of the transmit antenna at the selectable harmonic frequency; and
a controller circuit configured to characterize the object based on the response of the transmit antenna.
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Abstract
A system for detecting and characterizing an object proximate to a wireless power transmitting unit includes a transmit circuit having a transmit antenna, the transmit circuit configured to transmit at least one signal having a frequency related to a fundamental power transmit frequency, the transmit circuit configured to measure a response of the transmit antenna, and a controller circuit configured to characterize the object based on the response of the transmit antenna.
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Citations
25 Claims
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1. A system for detecting and characterizing an object proximate to a wireless power transmitting unit, comprising:
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a transmit circuit having a transmit antenna, the transmit circuit configured to transmit at least one signal at a selectable harmonic frequency of a fundamental power transmit frequency; the transmit circuit configured to measure a response of the transmit antenna at the selectable harmonic frequency; and a controller circuit configured to characterize the object based on the response of the transmit antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for detecting and characterizing an object proximate to a wireless power transmitting unit, comprising:
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generating at least one signal at a selectable harmonic frequency of a fundamental power transmit frequency; transmitting the at least one signal at the selectable harmonic frequency of the fundamental power transmit frequency using a transmit antenna in a transmit circuit; measuring a response of the transmit antenna at the transmit circuit at the selectable harmonic frequency; and using the measured response of the transmit antenna to characterize the object. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A device for detecting and characterizing an object proximate to a wireless power transmitting unit, comprising:
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means for generating at least one signal at a selectable harmonic frequency of a fundamental power transmit frequency; means for transmitting the at least one signal at the selectable harmonic frequency of the fundamental power transmit frequency; means for measuring a response of the transmitting means at the selectable harmonic frequency; and means for characterizing the object based on the measured response of the transmitting means. - View Dependent Claims (20)
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21. An apparatus for detecting an object positioned in a magnetic field generated by a wireless power transmitting unit, the apparatus comprising:
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a power transmit circuit comprising a transmit antenna configured to generate the magnetic field in response to being driven by a signal at a fundamental power transmit frequency, the signal having one or more signal components at a frequency related to the fundamental power transmit frequency; a measurement circuit configured to measure one or more characteristics indicative of an impedance of the transmit antenna at a selectable harmonic frequency of the fundamental power transmit frequency in response to the object positioned in the magnetic field; and a controller circuit configured to determine one or more characteristics indicative of a type of the object based on the one or more characteristics indicative of the impedance of the transmit antenna at the selectable harmonic frequency of the fundamental power transmit frequency and based on one or more expected characteristic impedance responses for different types of objects at the selectable harmonic frequency of the fundamental power transmit frequency. - View Dependent Claims (22, 23, 24, 25)
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Specification