Power Loss Estimation of Isolated Coupled Inductor based Dual Active Bridge Converter using GaN Devices

The interleaved coupled inductor-based dual active bridge (CIDAB) converters are capable to improve the efficiency over a wide range of loads as compared to conventional dual active bridge (DAB) converters. Using the traditional phase-shifting control method, this study examines the power losses of the CIDAB converter in forwarding mode i.e. low to high voltages, and reverse mode i.e. high to low voltages power flow operations. The silicon (Si) and gallium nitride (GaN) switching devices are considered for this analysis and their characteristics are extracted from the datasheet. The goal of this work is to create a power loss model which can be utilized in estimating the power losses of the CIDAB converter using GaN semiconductor devices and to compare it to the current literature. Further, the simulation studies are performed through the MATLAB software and the results are discussed. It is observed that the GaN-based CIDAB converter is in great competition with the existing similar topologies.