A.S. Nabatchikov - Post-graduate Student, Assistant, Department of Electronics and Microprocessor Technology, Smolensk Branch of the National Research University Moscow Power Engineering Institute (Smolensk). E-mail: nabatchicov@rambler.ru I.V. Yakimenko - Dr.Sc. (Eng.) Associate Professor, Department of Electronics and Microprocessor Technology, Smolensk Branch of the National Research University Moscow Power Engineering Institute (Smolensk). E-mail: jakigor@rambler.ru