Design and implementation of an improved tri-state boost converter with optimal Type-III controller

Abstract

Over the years, DC-DC switched mode power converters (SMPC) are playing important role for technological advancement. Good dynamic performance is the one of the important criterion for designing the closed-loop converters. But some DC-DC switching converters (such as buck-boost, boost, flyback, etc.) have non-minimum phase problem due to a right-half plane (RHP) zero in their small-signal control-to-output transfer function. So, the converters experience poor dynamic performance due to presence of non-minimum phase problem. Tri-state boost converter with PID controller can solve the non-minimum phase problem easily, but the dynamic response will not be satisfactory. In this work, an improved tri-state boost converter with gravitational search algorithm (GSA)-based optimised Type-III controller is designed and fabricated in the laboratory. The comparison between closed-loop performances of conventional boost converter and tri-state boost converter with classical ('k-factor' method) and optimal Type-III controllers have been presented in this work. The experimental results prove the efficacy of optimised controller for the proposed converters. The proposed control scheme based on optimised Type-III controller for tri-state boost converter is not found in any literature and is newly introduced in this paper.