Genetic Algorithm Assisted Parametric Design of Splitting Inductance in High Frequency GaN-based Dual Active Bridge Converter

Splitting and placing interfacing inductance on both sides of the transformer has been proven to be an effective method, which extends the zero-voltage switching (ZVS) region for all the switching devices in the dual active bridge (DAB) converter. With the trend towards operating in higher frequency, achieving higher power density and higher efficiency, the converter model becomes more complex due to the non-negligible parasitic components that brings new challenges to DAB converter design. Traditional analytical methods have become hardly to imitate the proposed converter neither easily or precisely. Thus, artificial intelligence (AI) techniques are able to be utilized to assist the design process. When considering the converter system as a gray-box model, the metaheuristic algorithm can be implemented for the targeted design inside such gray-box. In this paper, a genetic algorithm (GA) is employed in the DAB converter parametric design with an explicit fitness desire and helps in discovering the high frequency oscillation (HFO) problem. Consequently, the splitting inductance tuning method is proposed for eliminating the HFO problem and minimizing inductors' loss. The methodology of implementing GA into converter parametric design and the proposed splitting inductance tuning method are introduced and verified with a 1 MHz GaN based DAB converter prototype.