New high step‐up two‐input‐single‐output converter with low‐voltage stresses on switches and zero input currents ripple

Abstract

This study proposes a new non-isolated high-step-up two-input-single-output DC–DC converter with the capability of cancelling input currents ripples. The proposed converter has low-voltage stresses on switches and diodes. Furthermore, it consists of two three-winding-coupled inductors connected with voltage multiplier cells. The voltage gain of the proposed converter can be increased by adding the second windings’ turns’ ratio or increasing the number of voltage multiplier cells. The third windings of coupled inductors, which are in series with capacitors at the input part of each boost stage are used to eliminate the ripples of input currents for the whole range of duty cycles. The proposed structure is a kind of two-phase converter that can be used as an interleaved converter with one-input-one-output terminals. In this study, the proposed converter is analysed during all operating modes and the voltage and current stresses of switches and diodes, voltage gain, required condition for cancelling input currents ripple are calculated. Moreover, in order to reconfirm theoretical analysis, EMTDC/PSCAD simulation and experimental results are presented.