Single Phase-Shift Modulation with Variable-Frequency to Reduce Conduction Losses of DAB Converters

DAB 컨버터의 전도 손실 저감을 위한 가변 주파수의 단일 위상 시프트 변조기법

This paper proposes a novel control method to minimize conduction losses of dual active bridge (DAB) converters for on-board chargers of electric vehicles (EVs). In the control method, two variables are regulated, which are the phase-shift angle between the primary and secondary full bridges and the switching frequency. From time-domain analysis, an optimal phase-shift angle is derived to achieve the minimum RMS value of the transformer current. The proposed method was implemented for a 3.6-kW SiC-based prototype to validate its effectiveness. A high efficiency over 97.3% has been achieved for a wide output voltage range.