PWM filter circuit and related control system
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United States of America Patent
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Aug 25, 2020
Grant Date -
Jun 27, 2019
app pub date -
Aug 23, 2018
filing date -
Dec 22, 2017
priority date (Note) -
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Abstract
A filter circuit comprises a resistor-capacitor (RC) circuit, a comparator circuit, and an output control circuit. The RC circuit is configured to generate a ripple voltage according to the PWM signal. The comparator circuit couples with the RC circuit, and is configured to compare the ripple voltage with a first reference voltage, and output a switch signal according to a comparison result. The output control circuit couples with the comparator circuit and the RC circuit, and is configured to generate an output signal according to the switch signal and the PWM signal. When a duty ratio of the PWM signal is larger than a predetermined threshold value, the output signal is corresponding to the PWM signal. When the duty ratio of the PWM signal is smaller than the predetermined threshold value, the output signal is not corresponding to the PWM signal.
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