| PhD Seminar

Name of the Speaker: Mr. Surve Uddhav Ramchandra (EE20D404)
Guide: Prof. Srirama Srinivas
Venue: ESB-244 (Seminar Hall)
Online meeting link: https://meet.google.com/ypr-ivvi-rws
Date/Time: 5th September 2024 (Thursday), 3:30 PM
Title: Loss Minimization of Dual Active Bridge Converter Through Design Optimization for EV Charging Applications

Abstract :

Over the past decade, the transportation sector has experienced significant growth of electric vehicles (EVs) due to the government encouragement and lack of tailpipe emissions contributing to global climate change. The typical power-train architecture of an EV consists of a dedicated onboard charger (OBC) connected to the high-voltage battery pack of the EV. The power circuit of OBC usually consists of two stages: an active front-end converter followed by a dc-dc conversion stage. The dual active bridge (DAB) converter is the most widely adopted topology for the dc-dc power conversion stage in electric vehicle (EV) battery charging owing to its inherent capabilities such as soft switching, galvanic isolation and bidirectional power flow. The focus of present research is on the DAB converter.

From a detailed literature search it is learnt that the performance of DAB gets compromised when it operates over a wide voltage and power range during the battery charging process. Therefore, the optimal design and operation of the DAB converter are paramount to achieving efficient operation over the charging process. The existing design approaches prioritize the optimization of the converter, typically at peak power conditions, while disregarding the other charging power levels during the design optimization process. Additionally, the DAB converter's ability to switch with zero voltage (ZVS) is restricted when operating under light-load conditions.

The seminar talk brings out the shortcomings of the existing design approaches and proposes an optimal design strategy for the DAB converter that considers all the charging power modes in the design process. The talk presents the proposed method, analytical formulation first, followed by verification using PLECS simulation studies and thoroughly validated experimentally on a laboratory prototype.