ANALYSIS AND MODELING OF TRANSFORMER LESS HIGH GAIN BUCKBOOST DC-DC CONVERTER FOR SOLAR ENERGY APPLICATION

This paper proposes a transformer less buck boost converter model usedfor solar energy application, which provides, higher efficiency and its voltage gain is quadratic of the traditional buck-boost converter. It can operate in a wide range of output voltage, that is, the proposed buck-boost converter can achieve high or low voltage gain without extreme duty cycle. Moreover, the output voltage of this transformer less buck-boost converter is common-ground with the input voltage, and its polarity is positive. The two power switches of the buck-boost converter operate synchronously. The operating principles of the buck-boost converter operating in continuous conduction modes are presented. The new transformerless buck-boost converter is analyzed by providing required DC voltage frompv array as input to the converter. The simulation results are presented to confirm the capability of the converter to generate high voltage ratios. The comparison between the proposed converter and the traditional converter is also analyzed to reveal the improved voltage gain. The proposed converter is suitable for a wide application which requires high step-up DC-DC converters such as DC microgrids and solar electrical energy.