Phonexai Yingyong received a B.Eng. and a M.Eng. in electronic engineering from the National University of Laos (NUOL), Laos, in 2011 and 2016, respectively. He also has also worked as an electrical engineer for the Electricité Du Laos (EDL) in the field of electrical generation division at the EDL training center since 2011. He is currently a Ph.D. student in the Department of Instrumentation and Control Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, Thailand. His research interests are in piezoelectric and triboelectric energy harvesters, micropower management, electrical power analysis, and automatic control systems.