A Two-Stage Isolated/Bidirectional Dc-Dc Converter

Abstract

In this paper we proposed a two-stage isolated/bidirectional dc/dc converter with three bridges. In these two bridges for electrical isolation purpose and constant gain, and bidirectional control is accomplished through only a single bridge. Link capacitor can be alleviated by capacitor division and synchronizing operation of both stages and rms currents in the high voltage source. This construction provides a simple control scheme and removes snubber circuitry, so high efficiency can be obtained under a high switching frequency regardless of operational modes.