1. Department of Electrical and Photonics Engineering, Technical University of Denmark, Kongens Lyngby, Denmark
2. Resonant Link Inc., Zurich, Switzerland
3. Fujian Provincial University Engineering Research Center for Industrial Automation, School of Electronic, Electrical Engineering and Physics, Fujian University of Technology, Fuzhou, China
4. State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin, China