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Teodora Plamenova Todorova
Department of Electronics and Microelectronics, Technical University of Varna, 1 Studentska Str.,Varna, Bulgaria
Vencislav Cekov Valchev
Department of Electronics and Microelectronics, Technical University of Varna, 1 Studentska Str.,Varna, Bulgaria
Alex Van den Bossche
Electrical Energy Laboratory, Department of Electrical Energy, Metals, Mechanical Constructions and Systems, Ghent University, Technologiepark 913, Zwijnaarde,Ghent, Belgium