METHOD OF FOREIGN OBJECT DETECTING DURING WIRELESS POWER TRANSFER AND POWER TRANSMITTER IN WIRELESS CHARGING SYSTEM

Abstract: a method of foreign object detecting during wireless power transfer and a power transmitter are provided. the power transmitter includes: a control circuit, configured to temporarily interrupt transmission of an electricity signal; a signal sampling circuit, configured to sample, during the transmission of the electricity signal is temporarily interrupted, a signal generated by an oscillation circuit of the power transmitter; the control circuit is further configured to: obtain an oscillation waveform based on sampled values; perform an integral operation on the oscillation waveform and average the result of the integral operation to obtain an integrated average value; obtain an oscillation frequency of the oscillation waveform; and determine whether there is a foreign object based on the integrated average value and the oscillation frequency. the power transmitter can effectively improve the accuracy of determining whether there is a foreign object approaching the power transmitter during the wireless power transfer.

Inventor(s): YOU JHIH JHENG, RI LONG LO, LO YUN SUN, CHIH WEI LIU

CPC Classification: H02J50/60 (responsive to the presence of foreign objects, e.g. detection of living beings)

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