An integrated coupled inductor-capacitor DC-DC high step-up converter

In this paper, an integrated coupled inductor-capacitor DC-DC high step-up converter is proposed for the renewable energy systems. A DC-DC high step-up converter is mandatory owing to the comparative low output voltage of renewable energy systems. A new configuration has been proposed in this paper, in which capacitor and coupled inductor are integrated into a converter to achieve the required results. To charge the capacitor a coupled inductor is used, not only the voltage gain significantly boosted and the switch voltage clamped inherently but also the turns ratio and part count scale down. When proposed converter operates in ORF mode, this results in the decline of conduction losses and enhances its efficiency. The proposed converter has good efficiency and simplest structure as it has only six components. This paper illustrates the key state operation principles of the proposed converter and derivation of its steady-state operations. A prototype is designed, and experiments are performed in the laboratory to verify the precision of the theoretical analysis. The highest efficiency of 97% has been achieved in the laboratory.