DETECTING METHOD AND POWER TRANSMITTER IN WIRELESS CHARGING SYSTEM

Abstract: the embodiments of the present application provide a detecting method and a power transmitter in a wireless charging system. the power transmitter includes: a signal sampling circuit, configured to sample a signal generated by an oscillation circuit of the power transmitter; and a control circuit, coupled to the signal sampling circuit, configured to: obtain an oscillation waveform based on the obtained 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 a oscillation frequency of the oscillation waveform; and determine whether there is a foreign object or a power receiver approaching the power transmitter, 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 or a power receiver approaching the power transmitter.

Inventor(s): YOU JHIH JHENG, RI LONG LO, ZHENG BO LIANG, TA LUN CHANG

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

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