DC-DC Transformerless Modified SEPIC Converter Based on Switched Reactive Circuitry Technique (SRC)

In this paper a new transformerless modified SEPIC buck-boost converter with switched reactive circuitry technique is proposed. In this SRC two diodes, one inductor and one capacitor exist that causes to improve voltage gain. Some advantages of the proposed converter are positive out-put voltage, higher conversion ratio and continues input current with low ripple. The suggested converter operate in continues conduction mode and provides two operation modes. The calculations of voltage gain and efficiency, voltage stress of the switch and diodes, design consideration and the comparison of the voltage gain between the proposed converter and other converters are done and given in this paper. Finally, to validate the calculations and analysis of the proposed converter simulation results with the PSIM software are given at the end of the paper.

Keywords:

SEPIC , voltage gain , DC-DC buck-boost converter , continuse input current , switched reactive circurity