Modified Switched‐Inductor‐Based Quadratic Boost Converter With Closed Loop Control for Renewable Energy Systems

ABSTRACT This paper presents a Modified Switched‐Inductor‐based Quadratic Boost Converter (MSLQBC) designed to achieve high voltage gain with reduced device stress and enhanced efficiency. The converter integrates a switched‐inductor‐based topology with voltage self‐balancing, continuous input current, and a common ground point. In this study, a topological refinement is implemented to address the high current stress of the switch compared to conventional converters. The modified circuit configuration achieves pronounced current stress reduction without any trade‐off in voltage gain or component count, resulting in lower device ratings. The steady‐state analysis of the converter is carried out in Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM), considering two different duty ratios for the switches. To ensure practical accuracy, non‐idealities, including parasitic resistances of semiconductor devices and passive elements, are incorporated into the analytical framework. A component‐level design is carried out for an input voltage of 48 V and an output voltage of 400 V at a 300‐W load with a 50‐kHz switching frequency. Analytical evaluation predicts an efficiency enhancement of 96.85%, confirming the capability of the topology for high‐gain, high‐efficiency operation. A comparative assessment with recently reported high‐gain converters further demonstrates an improved voltage gain with a reduced component count and reduced device stress. To validate the theoretical analysis, a laboratory‐scale hardware prototype is fabricated, achieving a peak efficiency of 95.27% at rated operating conditions. Efficiency performance is also experimentally characterized across a wide load range to establish the relationship between output power and conversion efficiency. In addition, a small‐signal dynamic model of the converter is developed, from which the principal control‐oriented transfer functions are derived. A Proportional‐Integral (PI) controller tuned using the Stability Boundary Locus (SBL) method is implemented for output voltage regulation. Experimental transient studies under input and load perturbations, along with measured frequency response characteristics, confirm closed‐loop stability and effective dynamic performance. These results collectively establish the converter as a promising, cost‐effective, and scalable solution for renewable energy and DC microgrid applications.