A High Step-Up DC-DC Converter With High Voltage Gain and Zero-Voltage Transition

This article presents a new high-step-up dc-dc converter. The proposed converter optimally integrates the coupled inductors, voltage multiplier cells, and series capacitor techniques to attain high voltage gain with low voltage stress. Moreover, in this configuration, the voltage multiplier circuit not only participates in increasing the voltage gain but also absorbs the leakage energy. In addition, zero-voltage switching and zero-current switching conditions are obtained for all switches and diodes, respectively. As a result, overall efficiency is improved. In this topology, the leakage inductance of the coupled inductors is used as a resonant inductor. Therefore, no additional magnetic core is needed. Furthermore, the ripple of the input current is reduced by using the interleaving technique. Also, this converter features automatic uniform current-sharing characteristics due to the charge balance of the blocking capacitors. The experimental results obtained from a prototype with 12 V input and 180 V output validate the theoretical analyses.