Switched filter for the compensation of power processors

An analog-amplitude, discrete-time recursive filter is proposed for the frequency compensation of power processors. It was applied to a Cuk converter and allowed an almost ideal profile of G/sub loop/ to be reached. The filter copes with converters that chop up to 0.5 MHz and seems to be better than time-invariant compensation networks and digital-signal-processing-based filters. An exact small-signal analysis of the switching cell and the compensation filter is carried out, and experimental results on gain and phase frequency dependence are reported.<>