Comparison of Dual-Active-Bridge-based Topologies for single-phase single-stage EV On-board Chargers

Single-stage on-board chargers for EVs are an attractive solution as they reduce the number of converters stages leading to potential increments in power density and cost reduction. Dual-active-bridge topologies are particularly attractive for these applications as they offer a large voltage conversion range, isolation, and relatively simple controllability. Several DAB-based single-stage AC-DC topologies can be found in the literature; however, a comparison of said topologies has not been yet been presented. Filling the gap, this paper presents and compares the most promising DAB-based topologies used for single-stage OBC applications. For this purpose, a multi-objective optimization with a Pareto-front is used. Apart from the design of the main components, EMI filters are designed for each topology and their size is considered as part of the evaluation.