Design, Control, and Performance Evaluation of a Bidirectional Single-Stage On-Board Charger for Electric Vehicles

General information about the project

Project title: Design, Control, and Performance Evaluation of a Bidirectional Single-Stage On-Board Charger for Electric Vehicles

Contact: Suyog Sawant, Prof. Dr. Marco Jung

E-Mail: suyog.sawant@h-brs.de; marco.jung@h-brs.de 

Available Places: 1

Start: Winter-/Sommersemester 2026/27

Degree programs (multiple selections allowed!): 

• Electrical Engineering electronical system development
• Mechanical Engineering mechatronics
• Sustainable Engineering

Short description and additional information

Single-stage On-Board Chargers (OBCs) are gaining significant attention in electric vehicle (EV) applications due to their distinct advantages of having fewer components, reduced system cost, and higher power density compared to conventional two-stage architectures. In the scope of this project, the viable topologies to realise a single-stage OBC will be systematically analysed through a comprehensive literature review and detailed simulation studies. Key topologies such as Matrix converter, Dual Active Bridge (DAB), CLLC resonant converters, and integrated PFC-based isolated converters will be evaluated based on efficiency, complexity, and switching stress. Further, the selected topology will be utilised to develop a dedicated optimal control algorithm considering the bidirectional power transfer capability, which is essential for emerging Vehicle-to-Grid (V2G) and Vehicle-to-Home (V2H) applications. The control design will focus on achieving soft-switching across a wide load range, ensuring fast dynamic response, and maintaining high conversion efficiency. Additionally, a comprehensive simulation framework will be established to assess the steady-state and transient performance of the proposed converter under various operating conditions, including grid disturbances and load variations. This project will result in a validated design methodology and a comprehensive control architecture for a 22 kW single-stage bidirectional OBC, providing a robust theoretical foundation that supports practical implementation, experimental verification, and system scalability.

Project Phases

Master Project 1:

Comprehensive literature review and simulation-based comparison of single-stage OBC topologies to select the optimal candidate.

Master Project 2:

Development of a dedicated control strategy with simulation verification for V2G/V2H bidirectional operation.

Master thesis:

Comprehensive validation of the control architecture under varied operating conditions, including hardware implementation and experimental verification.