Power reception apparatus, medium, and method for controlling electrical power supplied to a load of power reception apparatus
First Claim
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1. A power reception apparatus comprising:
- a load configured to use electrical power; and
a power reception coil configured to wirelessly receive transmissions of the electrical power from a power transmission apparatus, the power reception apparatus is configured to send a threshold Q-value to the power transmission apparatus in response to receiving one of the transmissions from the power transmission apparatus,wherein the threshold Q-value is a Q-value of the power reception coil that is measurable when no foreign matter is near the power reception coil, 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.
25 Citations
19 Claims
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1. A power reception apparatus comprising:
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a load configured to use electrical power; and a power reception coil configured to wirelessly receive transmissions of the electrical power from a power transmission apparatus, the power reception apparatus is configured to send a threshold Q-value to the power transmission apparatus in response to receiving one of the transmissions from the power transmission apparatus, wherein the threshold Q-value is a Q-value of the power reception coil that is measurable when no foreign matter is near the power reception coil, 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)
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10. 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 Q-value of a power reception coil when no foreign matter is near the power reception coil 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 Q-value of the power reception coil when no foreign matter is near the power reception coil; a step of wirelessly, by the power reception coil, 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 reception coil receiving one of the transmissions from the power transmission apparatus. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification