DEMODULATION CIRCUIT AND WIRELESS CHARGING DEVICE HAVING THE SAME
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United States of America Patent
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Aug 4, 2016
app pub date -
Apr 23, 2015
filing date -
Feb 4, 2015
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Abstract
The present disclosure illustrates a demodulation circuit disposed in a wireless charging device. The demodulation circuit comprises a detection unit, a delay unit and a demodulation unit. The detection unit detects a pulse width modulation signal received by the coil, and outputs a modulation signal. The delay unit delays the modulation signal to generate a delay signal. The demodulation unit compares the modulation signal with the delay signal to generate a demodulation signal. When a voltage level of the modulation signal is higher than or equal to a voltage level of the delay signal, the demodulation unit outputs a high logic level demodulation signal. When the voltage level of the modulation signal is lower than the voltage level of the delay signal, the demodulation unit outputs a low logic level demodulation signal.
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