A new SEPIC-Zeta bidirectional converter with high efficiency for renewable energy systems

Abstract

This study introduces a new bidirectional converter that maintains the zero-voltage switching feature without complicating the circuit operation through an auxiliary circuit. Additionally, the circuit's design ensures consistent operation during both ascending and descending modes, coupled with a straightforward control circuit. An exhaustive analysis of the converter in various modes has been performed. Furthermore, the converter operates symmetrically in both step-up and step-down modes, with two out of the four switches remaining off in each mode. The auxiliary circuit introduced in this design is a model of modularity and versatility. It seamlessly integrates with two-phase or multi-phase bidirectional converters without necessitating extra components. Imagine it as a universal adapter that, regardless of the number of phases or the direction of conversion, plugs in effortlessly, enhancing the system's functionality without cluttering it with additional parts.This innovative approach not only simplifies the design process but also streamlines the overall architecture, making it a highly efficient solution for complex power conversion scenarios. Simulation of the proposed converter was conducted using PSPICE software, validating the theoretical analysis. Furthermore, a 60 W prototype of the converter was constructed, which its outcomes corroborated the simulation findings.