A DC-DC buck-boost converter based on the three-state switching cell

Abstract

This work presents a buck-boost converter based on the three-state switching cell (3SSC), which has been widely employed in the conception of several converter topologies. The structure is part of family of converters that has been previously reported in literature, even though the detailed study of dc-dc buck-boost-type 3SSC-based converters has not been presented before. Compared to the classical buck-boost converter, prominent advantages can be addressed to the proposed approach e.g. the input current is continuous when the duty cycle is higher than 0.5 and the current stresses through the semiconductor elements are reduced. A qualitative analysis is carried out in overlapping mode, so that the operating stages are analyzed and a design procedure can be obtained. Simulation and experimental results are presented and properly discussed in order to validate the theoretical assumptions.