Dual Active Bridge (DAB) Converter – IV | Inductor Current Analysis | Average Power Derivation | Electric Vehicles | Lecture 10

In this lecture, we continue the detailed analysis of the Dual Active Bridge (DAB) Converter by deriving the inductor current waveform and average power transfer equation under Single Phase Shift (SPS) control. A step-by-step analysis of all four operating modes is presented using bridge voltages, inductor voltage, current waveforms, and switching states.

The lecture explains how the leakage inductance influences the slope of the inductor current in each operating mode and discusses the concept of back power (circulating power) that does not contribute to useful energy transfer. Finally, the average power transferred by the DAB converter is derived, followed by a practical example of a 400 V to 750 V EV charging system operating under Single Phase Shift control.

Topics Covered

Review of Dual Active Bridge (DAB) Converter
Single Phase Shift (SPS) Control
Four Operating Modes of DAB
Inductor Voltage in Each Operating Mode
Inductor Current Waveform Derivation
Effect of Leakage Inductance
Current Slope Analysis
Load Current Waveform
Back Power (Circulating Power)
Average Power Transfer Derivation
Practical 400 V to 750 V EV Charging Example
Switching Waveforms and Power Flow Analysis

Who Should Watch?

B.Tech. and M.Tech. students
Power Electronics learners
Electric Vehicle enthusiasts
GATE and 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.
R. W. De Doncker, D. M. Divan, and M. H. Kheraluwala, "A Three-Phase Soft-Switched High-Power-Density DC/DC Converter for High-Power Applications," IEEE Transactions on Industry Applications.

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