| MS Seminar

Name of the Speaker: Mr. Abdul Rahman (EE22S053)
Guide: Dr.Kamalesh Hatua
Online meeting link: http://meet.google.com/awr-zkvp-jjd
Date/Time: 19th June 2025(Thursday), 11:00 AM
Title: Efficient Operation of Dual Active Bridge over Full Load Range with Triple Phase Shift Control.

Abstract :

Dual active bridge (DAB) converters are a compelling choice for high frequency isolated bidirectional DC–DC conversion in applications such as electric vehicle charging, renewable energy systems and solid-state transformers, owing to their natural soft switching capability, galvanic isolation and high power density. However, conventional control techniques like SPS and DPS are limited by increased circulating current and reduced ZVS performance under non-unity voltage gain conditions and light load levels. While these limitations are effectively addressed by triple phase shift (TPS) control, which offers greater flexibility in minimizing inductor RMS current and improving ZVS for all power ranges, its implementations in existing literature are based on time-domain mathematical techniques, which are often complex, computationally intensive and cumbersome to implement in practical DAB converters. This work proposes a simple and effective TPS control strategy that aims to minimize inductor RMS current while achieving ZVS across all power ranges. The proposed method is based on frequency domain fundamental harmonic analysis (FHA), which allows for analytical derivation of optimal phase shift ratios without resorting to complex time domain formulations. The algorithm computes optimal values of internal and external phase shift ratios for each operating point offline using the fmincon function of MATLAB. An actual 3 kW DAB hardware prototype is developed to validate the proposed approach. Experimental results show strong agreement with simulation outcomes and confirm that the TPS control significantly reduces inductor RMS current while ensuring ZVS operation, thereby enhancing overall converter efficiency.