Apparatus, system, and method for detecting a foreign object in an inductive wireless power transfer system via coupling coefficient measurement
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United States of America Patent
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Jan 24, 2017
Grant Date -
Oct 3, 2013
app pub date -
Mar 30, 2012
filing date -
Oct 13, 2011
priority date (Note) -
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Abstract
An inductive wireless power device comprises a transmitter configured to generate an electromagnetic field to a coupling region for wireless power transfer to a receiver, and control logic configured to determine a coupling coefficient of the wireless power transfer when the receiver is within the coupling region. The control logic also determines a presence of a foreign object within the coupling region responsive to a comparison of the determined coupling coefficient and an expected coupling coefficient for the wireless power transfer. An inductive wireless power device comprises a receiver configured to couple with an electromagnetic field in a coupling region for inductive wireless power transfer from a transmitter. The receiver is configured to alter a wireless power transfer characteristic of the transmitter for a determination of a presence of a foreign object within the coupling region responsive to a determination of a coupling coefficient of the wireless power transfer.
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