Prof. Dr. Sung-Jin Choi is a Professor at the Department of Electrical, Electronic and Computer Engineering, University of Ulsan, Ulsan, Republic of Korea. He completed his B.Sc., M.Sc. and Ph.D. at Seoul National University. He is a member of the Korean Institute of Power Electronics (KIPE) and the Institute of Electrical and Electronics Engineers (IEEE). His research interests are DC/DC power conversions, wireless power transfer, energy storage systems, and battery management systems.