Synthesis and Classification of Boost/Buck Structures for Getting Transformerless Hybrid Bidirectional DC-DC Converters

In this article a synthesis, comparative analyses, and architecture classification of the family of bidirectional boost/buck power converters is done taking into account the low voltage dc bus as input and high voltage as output. The classification can be input/output as series or parallel, where the series characteristic is the voltage division between the modules, while the parallel characteristic presents the current division feature. Also, in this article, an architecture is shown, which presents the characteristics of both, the parallel and series approach, at the same time. The theoretical analyses about voltage and current stresses, as well as voltage gain is carried out and validated through experimental results for nine prototypes that were built in the laboratory. The efficiency curves was extracted from 500 W to 1 kW.