Foreign Object Detection Apparatus and Method
AssigneeHuawei Digital Power Technologies Co., Ltd.
InventorsSongnan Yang, Donghao Wu, Xiaoqing Hu
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Abstract
A method includes performing a power loss calibration on a wireless power transfer system, enabling a wireless power transfer on the wireless power transfer system, calculating a power loss of the wireless power transfer system based on the power loss calibration, measuring a coupling factor between a transmitter coil and a receiver coil of the wireless power transfer system, and determining whether to continue the wireless power transfer of the wireless power transfer system based on the calculated power loss and the measured coupling factor.
Claims20
A method comprising:
- performing a power loss calibration on a wireless power transfer system;
- enabling a wireless power transfer on the wireless power transfer system;
- calculating a power loss of the wireless power transfer system based on the power loss calibration;
- measuring a coupling factor between a transmitter coil and a receiver coil of the wireless power transfer system;
- and
- determining whether to continue the wireless power transfer of the wireless power transfer system based on the calculated power loss and the measured coupling factor.
An apparatus comprising:
- a receiver coil configured to be magnetically coupled to a transmitter coil of a wireless power transfer system;
- and
- a detection coil over the receiver coil, the detection coil having a first turn and a second turn, wherein a first magnetic flux through the first turn and a second magnetic flux through the second turn are opposite to each other, and wherein as a result of the first magnetic flux and the second magnetic flux opposite to each other, a magnetic coupling between the receiver coil and the detection coil is appropriately equal to zero.
A method comprising:
- performing a coupling factor test to measure a first coupling factor representing a first relative position between a transmitter coil and a receiver coil of a wireless power transfer system;
- enabling a wireless power transfer on the wireless power transfer system;
- performing the coupling factor test to measure a second relative position between the receiver coil and the transmitter coil of the wireless power transfer system;
- and
- after finding a relative position change between the receiver coil and the transmitter coil of the wireless power transfer system, halting the wireless power transfer on the wireless power transfer system.
Dependencies are inferred from the claim text.