Soft Switched High Step-Up Multi-Port Converter With Single Magnetic Core and Auxiliary Switch for Renewable Energy Applications

This article presents a nonisolated high step-up soft switched multiport converter (MPC) based on the boost three port (BTP) structure with a single magnetic core. To attain high voltage gain, coupled inductors technique is utilized while an auxiliary circuit including only a switch, a capacitor along with three windings coupled with the main inductor are utilized to absorb the leakage inductance energy, provide soft switching and increase the voltage gain. The BTP structure main switch and added auxiliary switch operate at zero-voltage switching while all diodes turn
off
at zero current switching. Moreover, all switches are clamped to relatively low voltages to reduce their voltage stresses. Utilizing a single switch auxiliary circuit in all operating modes and employing a single magnetic core have considerably improved the converter efficiency, component count, and volume. A 200 W, 400 V converter prototype is implemented to validate the proposed MPC performance and a comprehensive feature comparison is performed with other counterpart converters.