PHASE-BASED DEMODULATION IN WIRELESS POWER TRANSFER SYSTEMS

According to an embodiment, a demodulator circuit for wireless power transfer systems addresses phase wrap-around issues in phase-shift keying (PSK) modulated signals. The demodulator converts received signals from Cartesian to polar coordinates. It performs phase correction to mitigate rapid fluctuations when the signal constellation approaches the negative real axis in the IQ plane. Phase correction techniques include applying a counter-controlled offset to rotate the constellation, removing the DC component using an exponential moving average filter, or employing a differential comb filter. The demodulator improves reliability in decoding backscatter communication from power receivers to transmitters, enhancing performance across various operating conditions and circuit configurations in wireless charging applications.