Adaptive Sliding-Mode Control of a Novel Buck-Boost Converter Based on Zeta Converter

The adaptive sliding-mode control of a high efficiency non-isolated buck-boost converter based on Zeta converter is presented. The converter has a dc gain higher than that of the Zeta converter and is a sixth-order system. The controller uses the inductor current error and a proportional term to generate the control action. The reference inductor current is first calculated using the estimated load conductance obtained from an adaptation algorithm. The proposed and existing sliding-mode controllers are closely related under certain conditions. The stability analysis of the closed-loop system is performed and sheds light on the controller's effectiveness. Experimental results are given to validate the theory.