Comparative Studies of Common Control Schemes for Reference Tracking and Application of End-point Prediction

This paper analyzes the reference tracking behavior of Buck converters using several control schemes including voltage-mode, current-mode and V²-control from both large-signal and small-signal domains. Loop gains applicable to reference tracking are highlighted, and reference-to-output transfer functions are derived for the cases when end-point prediction (EPP) is applied to enhance the response. A novel V²-controlled Buck converter with EPP is fabricated. The measured reference tracking response shows 10 times improvement in speed.