Dynamic loop compensator for continuous mode power converters

Abstract

This invention is directed toward a loop compensator which dynamically changes the compensation break points as a function of duty cycle, input voltage and output load current to insure system loop stability. The system identifier of the dynamic loop compensator identifies the converter circuit topology to which it is connected and relays corresponding circuit identification signals to a digital controller. Based on the identification signals, the digital controller implements one of three compensation algorithms that dynamically changes the compensation break points and consequently insures closed loop stability. Based upon system condition signals and one of the three compensation algorithms, the digital controller changes the compensation break points by producing variable frequency clock signals which are input into a bank of capacitors in a switching capcitor error amplifier network. In turn, the clock signals determine the effective resistance of the capacitors in the capacitor bank and accordingly change the location of the poles and zeros of the compensator thereby allowing the compensator to counteract the dynamically changing system.