Tiejun Wang Fang Fang Xiaoyi Jiang 0002 Xiang Rao Phase-shifting transformers of round shape used for multi-module inverters. 458-463 2012 ISIE https://doi.org/10.1109/ISIE.2012.6237130 conf/isie/2012 db/conf/isie/isie2012.html#WangF0R12