Multi-State Voltage Balancing of UAV's Cell String: A Reconfigurable WPT Based Multiport Hybrid Charging Approach. - Changsong Cai; Junhua Wang; Yang Luo; Yuxiao Rao; Pengcheng Zhang 002; Tianlei Zang; Hongjian Lin; Lizhou Liu (IEEE Trans. Ind. Electron., 2025)