Chaos control in buck converter using fuzzy delayed-feedback controller

In this paper, a new fuzzy delayed-feedback controller is developed to eliminate chaotic behavior of buck converter. Here, the impact of initial parameters is studied on the chaos occurrence. Chaotic region borders and bifurcation diagram are drawn for the buck converter. In order to control chaos when the operating point is in the chaotic region, a delayed-feedback controller is used. Moreover, to have a stable and robust closed-loop system in the presence of reference voltage changes, a supervisory fuzzy logic controller is utilized to determine the parameters of delayed-feedback controller. Overall controller is called fuzzy delayed-feedback controller. It has been confirmed through simulations that proposed scheme increases efficiency and flexibility of the buck converter.