Digital Synchronous Rectifier Control Using Extended Harmonics Impedance Model for High-Frequency GaN-Based LLC Converters. - Haoran Li 004; Cungang Hu; Chaohui Cui; Juan Yan; Wenjie Zhu 001; Xi Tang; Wenping Cao; Zhiliang Zhang; Donald Grahame Holmes (IEEE Trans. Ind. Electron., 2024)