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Analysis, Simulation of 3-Stage Cockcroft- Walton Voltage Multiplier for High Step-Up Dc-Dc Converter

M.N.Karthikeyan, R.P.Pandu, M.Gopisivaprasad, G.Seshadri

This paper presents a high step-up dc-dc converter based on the Cockcroft-Walton (CW) voltage multiplier without using step-up transformer. The proposed converter is quite suitable for applying low-input dc voltage, to high output dc voltage dc generation systems. It provides continuous input current to load with low ripple voltage and current. Voltage stress on the all switching device, diodes, and capacitors are lower than the other type. Moreover, based on the 3-stage Cockcroft-Walton (CW) voltage multiplier, the proposed converter can provide a suitable dc source is solar cells, fuel cell and other type source for a 3-stage multilevel inverter. In this paper, the control strategy employs two independent frequencies, one operates at high frequency to minimize the size of the inductor and other one operates at relatively low frequency to the desired output voltage ripple. The simulation is carried over by the MATLAB-SIMULINK.