To meet the requirements of high voltage boosting and high efficiency, a novel high step-up zero voltage transition (ZVT) DC/DC converter based on active switched-inductor (ASL) is proposed. This converter combines ASL and coupled inductor structure, thus can reduce the voltage and current stress of power switch, and the active clamping technology provides zero voltage transition (ZVT) for all switches. The coupled inductors can realize relatively high voltage gain with appropriate turns ratio while all magnetic components can be integrated in one core. In addition, thanks to the leakage inductance, the reverse recovery problem of diodes is resolved. The working principle of the proposed converter is analyzed in detail, also the characteristics including voltage gain, the condition of ZVT is discussed. Then, a family of derived converters are listed and compared to each other. According to the proposed converter, a 500W prototype with 100kHz switching frequency is established in the lab, and the experimental results are given to verify the analysis. INDEX TERMS High step-up voltage gain; Active switched-coupled inductor; ASL; Coupled inductor; Zero voltage transition This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.

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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 stepup 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.

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