A New High Voltage Gain Active Switched-Inductor Based High Step-Up DC–DC Converter With Coupled-Inductor

Abstract

This paper propounds a new high step-up DC-DC topology based on the active switched-inductor (A-SL) technique, which utilizes a coupled inductor (CI) for performance enhancement. Among the features of the presented topology are the following: (a) Better voltage gain (VG) and efficiency, (b) Since there are low voltages across power switches, it is possible to reduce the amount of power that is lost as a result of using MOSFETs with a low voltage rating and reduced internal resistance, (c) By reducing the turn ratio of the CI, the VG is enhanced, (d) Through the series connection of a capacitor with the CI primary winding, zero DC bias is achieved, and the core saturation problem is solved, (e) Input current division between input inductors and switches, (f) There is no limitation on duty cycle ( $0< D< 1$ ), and (g) Simple switching patterns and simultaneously driven switches. The propounded converter’s operation principle and steady-state analysis are explained in detail, and parasitic elements’ effects on VG and efficiency are examined. In addition, the VG, the number of components, and the voltage tension on power switches, diodes, and capacitors are compared and analyzed. An experimental laboratory prototype with 30V input and 400V output voltage is used to verify the validity of the study and the performance of the propounded topology.

Keywords

• Active switched-inductor
• coupled-inductor
• DC-DC converter
• high voltage gain