Insights on DAB Converter with Auxiliary Inductors

Dual-active-bridge (DAB) converters have gained popularity primarily owing to their appealing features for electric vehicle (EV) charging and smart-grid applications. One among them is soft-switching commutation that comes inherently with the device control techniques. However, DAB converters lose the zero-voltage-switching (ZVS) commutation on either bridge for large output voltage variation, especially under light-load conditions. In this context, this paper provides insights into the behavior of the auxiliary inductor-based DAB converter in terms of ZVS operations. The integration of auxiliary inductors makes it paramount to study the RMS currents through the power switches to gain awareness about the effects on the converter performance. A graphical analysis proved useful in this direction. Finally, simulations are carried out over various operating conditions to validate the analytical developments.