Transformerless DC-DC Converter With High Voltage Gain and Low Voltage Stress for Renewable Energy Systems

This paper puts forward a transformerless DC-DC converter. By increasing the energy storage capacity of the second inductor, higher voltage gain will be realized at no extremely duty-cycle. In addition, proposed converter also offers benefit of low voltage stress, low switching device power and sharing ground at input and output terminals, which make it even more appropriate for connecting renewable energy sources and DC bus. Steady-state analysis are also given and a 1kW experimental prototype was fabricated to validate its effectiveness.