Adaptive feedback control system and method for voltage regulators

Abstract

A voltage regulator includes a first feedback circuit, a second feedback circuit, and a feedback signal adaptive circuit. The first voltage feedback circuit includes an amplifier that is configured to generate a compensation signal according to a feedback signal from an output of the voltage regulator and a reference voltage, while the second voltage feedback circuit includes a comparator that is configured to generate a PWM signal to drive a switch circuit in which the comparator initiates the PWM pulse when the feedback voltage goes lower than the compensation signal and ends the PWM pulse when the sum of the feedback signal and a ramp signal exceeds the sum of the compensation signal and a threshold signal. The feedback signal adaptive circuit modifies the feedback signal according to changes in an input voltage of the voltage regulator and a control signal.

Dependencies are inferred from the claim text.