Advanced Parameter Optimization Strategy and Quantitative Evaluation of the Isolated Bidirectional Resonant DC-DC Converter

The Isolated Bidirectional Resonant DC-DC Converter (IBRDC) is one of the most attractive solution for Solid State Transformer (SST) applications, which can achieve soft switching to improve the efficiency of the whole system. However, the efficiency of the IBRDC largely depends on the resonant parameters. These parameters are coupled to each other and are limited by several constraints, especially the voltage regulation range, making these parameters difficult to optimize. Besides, the quantitative influence of the constraints remains to be analyzed. In this paper, a parameter optimization strategy based on the minimization of resonant current with multiple constraints is proposed, which effectively reduces the difficulty of the IBRDC parameter design and therefore has high engineering application value. Furthermore, the quantitative trend of resonant parameters and the efficiency of power devices in the IBRDC are derived, and the design boundary for the IBRDC is also illustrated.