Wireless power transfer device with foreign object detection, system, and method for performing the same
AssigneeSony Corporation
InventorsHiroaki Nakano, Osamu Kozakai, Shinji Komiyama, Kenichi Fujimaki
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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.
Claims20
A power reception apparatus comprising:
- memory configured to store a Q-value;
- and
- a power receiver configured to wirelessly receive a transmission of electrical power,
- wherein the power receiver is configured to send the Q-value to a power transmission apparatus after the power receiver wirelessly receives the transmission of the electrical power from the power transmission apparatus, and
- wherein the Q-value is a quality factor of the power reception apparatus, the quality factor is measurable when no foreign matter is near the power receiver.
A power reception method comprising:
- storing a Q-value in memory;
- wirelessly, by a power receiver, receiving a transmission of electrical power;
- sending the Q-value from the power receiver to a power transmission apparatus after the power receiver wirelessly receives the transmission of the electrical power from the power transmission apparatus,
- wherein the Q-value is a quality factor of the power reception apparatus, the quality factor is measurable when no foreign matter is near the power receiver.
Dependencies are inferred from the claim text.