Abstract

A current-assisted voltage control technique for high-power switch-mode-rectifier (SMR) converters is proposed. This technique implements a fast-forward AC current loop by sensing the current through the output filter capacitor. The control loop forces the AC current component of the output filter inductance to be synchronized with a symmetrical triangular reference waveform. As a result, the converter behaves like a fixed-frequency current-regulated voltage source with a low-output impedance and an increased bandwidth. A small-signal linear model is derived and the dynamic performance of a buck-derived SMR using the proposed control technique is analyzed. Simulation and experimental results are presented.