METHOD AND SYSTEM FOR PERFORMING FOREIGN OBJECT DETECTION IN AN INDUCTIVE WIRELESS POWER TRANSFER SYSTEM
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United States of America Patent
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Oct 18, 2016
Grant Date -
Oct 20, 2016
app pub date -
Apr 16, 2015
filing date -
Apr 16, 2015
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Abstract
A method for performing foreign object detection in an inductive wireless power transfer system is disclosed. In the embodiment, the method involves obtaining measurements from a base station of a wireless power transfer system during charging and determining transmitter energy loss in a power transmitter, Ptxloss, using the obtained measurements, wherein the transmitter energy loss, Ptxloss, is a function of at least Vcap and PTx, wherein Vcap is proportional to the voltage amplitude across the capacitor of an LC tank circuit in a power transmitter and PTx is the total power supplied to the power transmitter. The method also involves detecting the presence of a foreign object in response to the estimated transmitter energy loss.
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