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This paper proposes a high step-up dc-dc converter having a multiplier stage based on the Cockcroft-Walton (CW) voltage multiplier without a step-up transformer, which provides continuous input current with low ripple and high voltage ratio. For a given input voltage, a different output voltage boost up with different gain can be generated with the components of same specifications. Since the five level converter circuits uses five multiplier, more gain can be achieved. The proposed converter can provide a suitable dc source for any level multilevel inverter. In this paper, the control strategy employs two independent frequencies, one at high frequency, thereby minimize the size of the inductor and the other one at low frequency for a reduced output voltage ripple.

DC-DC booster with cascaded connected multilevel voltage multiplier applied to transformer less converter for high power applications