Enhanced cell balancing strategies for electric vehicles using a modified matrix GaNFET flyback topology with design and simulation analysis

This paper addresses the limitations of existing topologies, such as the dual active bridge (DAB) and half-full bridge (HFB) designs, which are hindered by high complexity, low conversion efficiency, and increased costs due to the necessity for multiple transformers and switches. To overcome these challenges, we introduce a novel active cell balancing topology based on a modified Matrix GaNFET Flyback approach. This new topology improves both balancing speed and conver-sion efficiency by incorporating various cell-balancing methods, including Cell-to-Cell (C2C), Cell-to-LV Battery-to-Cell (CLV2C), LV Battery-to-Cell (LV2C), and Cell-to-LV Battery (C2LV). The design reduces system size and cost by using a single isolation transformer instead of multiple or per-cell transformers. Furthermore, the integration of a switching matrix and GaNFET devices facilitates efficient energy transfer with fewer switches, allowing for high-frequency switching with minimal losses. MATLAB simulation results demonstrate that the proposed topology offers improved energy efficiency and a lower component count compared to traditional methods. The remainder of this paper provides a detailed discussion of the circuit structure, operational principles, and control strategies of the proposed topology, along with an analysis of the balancing principles and simulation results.