Digitally controlled buck converter

Digitally controlled step down converter with different control law algorithms is studied in this paper. The state controller is designed to eliminate the start-up overshoot and reduce maximal dynamic error of load change response, but the state controller is not capable to eliminate the steadystate error under the load change condition. By using an additional discrete PID controller the steady state error could be eliminated. For the next consideration, the decomposed discrete fuzzy PID controller has been analyzed. All control algorithms are performed at a continuous current mode of operation. The experimental results are presented in the paper. The control algorithms were implemented on 16-bit microcomputer.