The fuzzy state space controller for buck converter

In this paper digitally controlled step down converter using fuzzy state space control law algorithms is studied. 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 steady-state error under the load change condition. In order to improve this property two control algorithm were investigated. The first one was the state controller with constant gains supported by additional decomposed fuzzy PID controller and the second one was fuzzy state space controller. Both of 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 micro-computer.