Pulse width controller adopting feedback PWM integration system employing carrier-synchronous signal

摘要

A pulse width controller comprising a circuit for generating a carrier signal; a carrier synchronization circuit for generating a carrier synchronous variable pulse signal that varies in accordance with the voltage level of the carrier signal; an integrator for integrating a reference signal, the carrier signal and the carrier synchronous variable pulse signal to generate an integrated input signal; a comparator for comparing the integrated input signal with a comparison signal to generate a compared input signal; and a circuit for synchronizing the compared input signal with one or more of the carrier signal and carrier synchronous variable pulse signal to generate a synchronous input signal and providing the synchronous input signal to the input of the integrator to be integrated with other signals.