METHODS AND SYSTEMS FOR DETECTING FOREIGN OBJECTS IN A WIRELESS CHARGING SYSTEM
First Claim
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1. A wireless power charging system for charging a separate device having a power receiver coil, the wireless power charging system comprising:
- at least one power transmitter coil configured for transmitting power by inductive coupling to the power receiver coil in the separate device, the power transmitter coil characterized by a transmitter coil dimension that is a lateral dimension of the power transmitter coil; and
at least one foreign object detection (FOD) coil positioned in a location where a field transmitted by the power transmitter coil is the strongest, the FOD coil characterized by a FOD coil dimension that is the lateral dimension of the FOD coil and that is smaller than the transmitter coil dimension.
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Abstract
Methods and systems are described for using detection coils to detect metallic or conductive foreign objects that can interfere with the wireless transfer of power from a power transmitter to a power receiver. In particular, the detection coils are targeted to foreign objects that are smaller than a power transmitter coil in the power transmitter.
38 Citations
20 Claims
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1. A wireless power charging system for charging a separate device having a power receiver coil, the wireless power charging system comprising:
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at least one power transmitter coil configured for transmitting power by inductive coupling to the power receiver coil in the separate device, the power transmitter coil characterized by a transmitter coil dimension that is a lateral dimension of the power transmitter coil; and at least one foreign object detection (FOD) coil positioned in a location where a field transmitted by the power transmitter coil is the strongest, the FOD coil characterized by a FOD coil dimension that is the lateral dimension of the FOD coil and that is smaller than the transmitter coil dimension. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification