Pulse width modulation signal generation circuit and pulse width modulation signal generation method

摘要

The present invention discloses a PWM signal generation circuit and a PWM signal generation method. The PWM signal generation circuit includes: a reference signal generation circuit for generating a reference signal according to an input voltage; a variable ramp signal generation circuit for generating a variable ramp signal; and a comparator circuit for comparing the reference signal with the variable ramp signal to generate a PWM signal. A rising slope and/or a falling slope of the variable ramp signal is variable.

主权项

1. A pulse width modulation (PWM) signal generation circuit, comprising:
a reference signal generation circuit for generating a reference signal according to an input voltage; a variable ramp signal generation circuit for generating a variable ramp signal having a fixed peak level, wherein a rising slope and/or a falling slope of the variable ramp signal is variable and the variable ramp signal generation circuit determines a duty ratio of the PWM signal by adjusting the rising slope and/or the falling slope, and wherein the duty ratio is 100% or 0% when the reference signal is higher than the peak level; and a comparator circuit electrically connected to the reference signal generation circuit and the variable ramp signal generation circuit, for comparing the reference signal with the variable ramp signal to generate a PWM signal.