Yongqing Meng Ying Kong Ziyue Duan Xiuli Wang Xifan Wang Ruanming Huang Rong Ye A New Modular Multilevel AC/AC Converter Using HF Transformer. 116380-116391 2020 8 IEEE Access https://doi.org/10.1109/ACCESS.2020.3003930 db/journals/access/access8.html#MengKDWWHY20