Method and system of wireless power transfer foreign object detection
First Claim
Patent Images
1. A method of wireless power transfer foreign object detection comprising:
- measuring at least one tuned state of at least one secondary receiver coil;
detuning an adjustable load of the at least one secondary receiver coil from at least one resonant frequency;
measuring at least one detuned state of the at least one secondary receiver coil; and
determining at least one foreign object based at least in part upon the at least one tuned state and the at least one detuned state.
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Accused Products
Abstract
A wireless power transfer foreign object detector having, at least one secondary receiver coil, an adjustable load electrically coupled to the at least one secondary receiver coil, and at least one temperature sensor providing at least one temperature detection signal, wherein the at least one temperature sensor responsive to at least one thermal state of the at least one secondary receiver coil, and wherein foreign object detection is based at least in part upon the at least one temperature detection signal.
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Citations
20 Claims
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1. A method of wireless power transfer foreign object detection comprising:
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measuring at least one tuned state of at least one secondary receiver coil; detuning an adjustable load of the at least one secondary receiver coil from at least one resonant frequency; measuring at least one detuned state of the at least one secondary receiver coil; and determining at least one foreign object based at least in part upon the at least one tuned state and the at least one detuned state. - View Dependent Claims (2, 3)
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4. A wireless power transfer foreign object detector comprising:
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at least one primary transmitter coil; one or more satellite transmitter coils adjacent to the at least one primary transmitter coil; and wherein foreign object detection is based at least in part upon at least one characteristic of an electrical coupling of at least one of the one or more satellite transmitter coils. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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11. A method of wireless power transfer foreign object detection comprising:
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measuring at least one characteristic of an electrical coupling between at least one primary transmitter coil and at least one satellite transmitter coil; measuring at least one characteristic of an electrical coupling between the at least one primary transmitter coil and at least one secondary receiver coil; and determining at least one foreign object based at least in part upon the measured at least one characteristic of the electrical coupling between the at least one primary transmitter coil and the at least one satellite transmitter coil and between the at least one primary transmitter coil and the at least one secondary receiver coil. - View Dependent Claims (12, 13, 14, 15)
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16. A method of wireless power transfer foreign object detection comprising:
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setting at least one primary transmitter coil to a primary transmitter voltage state; setting at least one secondary receiver coil to a secondary receiver voltage state; measuring a capacitive coupling between the at least one primary transmitter coil and the at least one secondary receiver coil; and determining at least one foreign object based at least in part upon the measured capacitive coupling between the at least one primary transmitter coil and the at least one secondary receiver coil. - View Dependent Claims (17, 18, 19, 20)
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Specification