Wireless power transfer device with foreign object detection, system, and method for performing the same
First Claim
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1. A power reception apparatus comprising:
- a power receiver configured to wirelessly receive transmissions of electrical power from a power transmission apparatus, the power reception apparatus is configured to send a threshold Q-value to the power transmission apparatus after receiving one of the transmissions from the power transmission apparatus,wherein the threshold Q-value is a quality factor of the power receiver that is measurable when no foreign matter is near the power receiver, the power reception apparatus is configured to store the threshold Q-value prior to receiving the transmissions from the power transmission apparatus.
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Abstract
Methods and apparatus for detecting the presence of undesirable foreign matter in a region between a wireless power transmission apparatus and a power reception apparatus are described. First and second detection methods, based on different detection schemes, may be used to detect and distinguish the presence of foreign matter from misalignment during power transfer operation. A first detection method may be used before power is transferred to a load in a power reception apparatus, and a second detection method may be used while power is supplied to the load.
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Citations
28 Claims
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1. A power reception apparatus comprising:
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a power receiver configured to wirelessly receive transmissions of electrical power from a power transmission apparatus, the power reception apparatus is configured to send a threshold Q-value to the power transmission apparatus after receiving one of the transmissions from the power transmission apparatus, wherein the threshold Q-value is a quality factor of the power receiver that is measurable when no foreign matter is near the power receiver, the power reception apparatus is configured to store the threshold Q-value prior to receiving the transmissions from the power transmission apparatus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for controlling electrical power supplied to a load of a power reception apparatus, the method comprising:
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a step of electrically, by the power reception apparatus, measuring a quality factor of a power receiver when no foreign matter is near the power receiver to measure a threshold Q-value; a step of storing, in the power reception apparatus, the threshold Q-value after the step of electrically measuring the quality factor of the power receiver when no foreign matter is near the power receiver; a step of wirelessly, by the power receiver, receiving transmissions of the electrical power from a power transmission apparatus after the step of storing the threshold Q-value in the power reception apparatus; and a step of sending the threshold Q-value from the power reception apparatus to the power transmission apparatus in response to the power receiver receiving one of the transmissions from the power transmission apparatus. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification