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Special Issue Article Open Access
This paper proposes a high power factor DC drive for the speed control of DC motor. In electric power system, load with low power factor draws more current which leads to energy wastage and higher electricity charges. A new configuration of SEPIC converter is used in this paper to improve power factor. Low switch voltage and high static gain of the converter is achieved by employing voltage multiplier method. Simple regenerative snubber is used in order to reduce losses associated with diode reverse recovery current and to achieve ZCS. Operational analysis, design procedure and simulation results for a 5HP, 500V, 1720 RPM DC motor is presented. The system show enhanced dynamic response to sudden change in speed reference, input voltage and load fluctuations.