Method and device for foreign object detection in induction electric charger
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United States of America Patent
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Feb 13, 2018
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app pub date -
Jul 12, 2013
filing date -
Jul 12, 2013
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Abstract
An example embodiment of the invention is a method and device for detecting foreign objects (FO) near the primary coil of an induction charger used in charging electric vehicle batteries. Individual sensors of a sensor array are configured to output a sensing signal in response to magnetically coupling the high frequency alternating magnetic field produced by the primary coil. A disable signal line is configured to disable the power source when a controller determines from scanned sensor signals, that a FO is present. An alarm can be activated by the microprocessor to alert the user to the presence of a FO on or near the primary coil. In this manner, damage can be avoided that could otherwise be caused from the presence of a FO near the primary coil. Moreover, a more efficient charging operation can be achieved by avoiding dissipating energy by heating a FO.
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