Average current controlled switching regulator - stability and feedforward analysis and simulation

The results of an analytical study and a simulation program for the effect of feed-forward on Average Current Controlled (ACC) switching regulators are presented. The Peak Current Controlled (PCC) converter is known to contain the features of feed-forward inherently, and enjoys its two basic advantages, i.e. fast response and low dc output error. To achieve this in the cases of the ACC or the Average Voltage Controlled (AVC) converters, an additional control loop must be added. The characteristics of this loop are investigated for static and dynamic performance, using the state-space averaging method, and it is shown that zero dc output error can be achieved. The results from a computer simulation program, which was developed for this circuit, match the theoretically predicted response quite accurately.