Abstract
ABSTRACTIn this paper, a zero-voltage-switching (ZVS) high step-up three level coupled inductor-based boost converter is proposed. Three-level structure of the proposed converter causes significant reduction of the switches and diodes voltage stress. The leakage inductance that is caused by coupled inductor leads to voltage ringing, the use of the active-clamp circuit in this structure not only eliminates the voltage ringing but also makes all switches turn on and off under ZVS condition that results in improving the efficiency. All the switches in the proposed converter will operate with an appropriate duty cycle for high step-up applications. The proposed converter features, operating principles and analysis are discussed in the paper and to verify the validity of theoretical analysis, the experimental results of a 200-W laboratory prototype with a 4-V input and 400-V output are presented.
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