Dual Active Bridge (DAB) Converter – II | Switching Modes & Phase Shift Control | Electric Vehicles | Lecture 08

In this lecture, we continue the study of the Dual Active Bridge (DAB) Converter by analyzing its switching operation, current flow paths, and phase-shift-based power transfer mechanism. The operation of both the primary and secondary full bridges is explained in detail, highlighting the role of switches and anti-parallel diodes under different current directions.

The lecture demonstrates how phase shift (δ) between the gate pulses of the two bridges controls the magnitude and direction of transferred power. Various operating cases including δ = 0°, 45°, and 90° are discussed using switching waveforms, inductor current, bridge voltages, and power flow analysis. This lecture builds the foundation for understanding DAB modulation techniques and advanced converter control.

Topics Covered
Review of Dual Active Bridge Converter
Primary and Secondary Bridge Switching Sequences
Current Flow Through Switches and Anti-Parallel Diodes
Inductor Voltage and Current Waveforms
Role of Leakage/Series Inductor
Bidirectional Power Transfer
Phase Shift (δ) Control
Operation for δ = 0°
Operation for δ = 45°
Operation for δ = 90°
Power Transfer Mechanism in DAB
Understanding Circulating (Back) Power
Foundation for Advanced DAB Modulation Techniques

Who Should Watch?

B.Tech. & M.Tech. students
Power Electronics learners
Electric Vehicle enthusiasts
GATE & ESE aspirants
Researchers working on isolated DC–DC converters
Engineers designing EV chargers and battery energy storage systems

Recommended References

R. W. Erickson and D. Maksimović, Fundamentals of Power Electronics, 2nd Edition, Springer.
C. Calderon et al., "General Analysis of Switching Modes in a Dual Active Bridge with Triple Phase Shift Modulation," Energies, 2018.

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