A Single-Switch High Step-Up DC- DC Converter with Low Input Current Ripple for Renewable Energy Applications

In this paper, a high step-up DC-DC converter with a dual-output is studied. The presented converter is assembled from a modified SEPIC and a three-level boost converter. The most significant advantage of this structure is achieving different high voltage gains for two outputs, using only one power switch and one input voltage source. The modified SEPIC converter supplies one of these outputs and the other output is provided by the three-level boost converter. The three-level stage is constructed by diode-capacitor units. The generated voltage gain by this stage is independent of the SEPIC part, which causes the proposed converter becomes appropriate for two different consumers. Depending on duty cycle of the switch, the SEPIC converter can be step-up or step-down, which in this case, it works in step-up mode. In further, the proposed converter analysis is explained in detail. Finally, performance of the presented converter is evaluated by simulation results.