Advanced control of buck converter

Abstract

The DC-DC conversion principle is a part of many electronics devices and is a subject of many research projects which are looking for the best control. In the search for the best control of a buck converter control line regulation should be considered in addition to load regulation. With ordinary PI controllers the dynamic response of the buck converter output voltage caused by load change is slow and exhibits large dynamic deviations from the desired steady state output value. With state space controller the dynamic response of the buck converter exhibits fast load response with small dynamic deviations from the desired steady state output value. Unfortunately dynamic response of state space controller to input voltage step change (line regulation) does not meet desired performance. It exhibits steady state error. Therefore an approach with outer PI controller in addition to the internal state space controller and disturbance observer based control approach have been considered.