DC-DC Converter Based on Cockcroft-Walton for High Voltage Gain

Abstract

This paper proposes a high step-up DC-DC converter based on Cockcroft-Walton (CW) voltage multiplier without using step up transformer. The low input DC voltage is boost up by boost inductor (Ls) in DC-DC converter and the proposed circuit performs the inverter operation. The n-stage CW-voltage multiplier is applying low input AC voltage to high output DC voltage. It provides continuous input current with low ripple, high voltage gain, reduced switching losses, low voltage stress on the switches, diodes and capacitors and also improving efficiency of the converter. The power switches having two independent frequencies fsm and fsc. The fsm operates at higher frequency of the output voltage and it is regulated by controlling the duty cycle of Sm1 and Sm2, while the fsc operates at lower frequency of the desired output voltage ripple and it can be adjusted by Sc1 and Sc2. Finally the proposed converter is validated by MATLAB simulation.