Derivation of Isolated Outputs from a Boost and Buck-Boost Topology

Abstract

Multiport converters are used to power more than one load using a single conversion stage. Many applications require galvanic isolation between the input and output of the converter. This paper presents a technique using which a boost and buck-boost topology can be transformed to a multiport converter with isolated outputs. The implementation starts with identification of terminals at which transformer can be interfaced for these topologies. Selection and characterization of circuit for implementation are defined. Some design expressions on selection of components for maximum power transfer are also defined. The proposed method is experimentally validated using lab prototypes.