High step-up isolated dc–dc converter with single input and double output and soft-switching performance for renewable energy applications

Abstract

A single-input double-output dc–dc isolated high step-up dc–dc converter with soft-switching feature is presented in this study. The concept is to utilise quadrupler technique to reach high voltage gain without large duty cycle. Additionally, soft-switching operation for all power switches and diodes is realised to reduce overall power losses and increase power conversion efficiency over a broad range. Furthermore, the leakage inductance energy of transformer is recycled to output with an active clamp circuit. Thus, the voltage stress on main switch is reduced and a low-voltage-rated metal–oxide–semiconductor field-effect transistors (with low R DS on ) can be used. Moreover, low input current ripple feature is helpful to lengthen life time of renewable energy power sources. Finally, the analysis is described in detail and performance of the proposed converter has been verified through experimental results.