Dual Active Bridge (DAB) Converter – I | Bidirectional DC–DC Converter | Electric Vehicles | Lecture 07

The Dual Active Bridge (DAB) Converter is one of the most widely used isolated bidirectional DC–DC converters in modern electric vehicles, battery energy storage systems, and DC microgrids. In this lecture, we begin with the motivation for DAB converters by reviewing the limitations of the forward converter, followed by a detailed introduction to the DAB converter topology, its construction, operating principle, and switching sequence.

The lecture explains why DAB converters have become the preferred choice for high-power applications by enabling bidirectional power transfer, better transformer utilization, and high efficiency. The converter structure consisting of two active full bridges connected through a high-frequency transformer and an inductor is introduced, along with the gate signals and current flow paths during different operating conditions.

Topics Covered
Review of Forward Converter
Limitations of the Forward Converter
Need for Bidirectional Isolated DC–DC Converters
Introduction to Dual Active Bridge (DAB) Converter
DAB Circuit Topology
Construction of DAB Converter
High-Frequency Transformer and Inductor
Advantages of DAB Converters
Bidirectional Power Flow
Switching Pattern of the Primary Bridge
Gate Pulse Generation
Current Flow Through Switches and Anti-Parallel Diodes
Foundation for DAB Operation and Control

Who Should Watch?

B.Tech. & M.Tech. students
Power Electronics learners
Electric Vehicle enthusiasts
GATE & ESE aspirants
Researchers working in DC–DC converters
Engineers designing isolated bidirectional power converters

Recommended References

R. W. Erickson and D. Maksimović, Fundamentals of Power Electronics, 2nd Edition, Springer.
A. R. Rodríguez et al., "An Overall Study of a Dual Active Bridge for Bidirectional DC/DC Conversion," IEEE ECCE, 2010.

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