Introduction to Topology Deduction of Dual-Active-Bridge Converters

This chapter provides a comprehensive review and classification of the dual-active-bridge (DAB) converter based on the topological modifications. DAB converters inherit favorite features including zero voltage switching (ZVS) capability, wide voltage range, and natural bidirectional power flow. Facing different applications and high market requirements, conventional DAB topologies with various modulations are gradually inadequate, so topological modifications are emerged in literature to deal with these situations. Firstly, basic cells including input/output types, active bridges, transformers, and auxiliary high-frequency networks are introduced. Next, by combining these cells flexibly, modified DAB converters are derived, and they are classified in terms of structural characteristics and discussed in detail. Finally, the characteristics, merits, and demerits of the modified DAB converters are concluded. Besides, evolvement history and future trends are also analyzed. This chapter aims to present a clear picture of the general law and framework of the modified DAB topologies and give the inspiration to derive new DAB topologies to address specific requirements.