A Case Study on the Development and Simulation of a High-Efficiency Flyback Converter for Portable Solar LED Lighting

Abstract

This paper presents the detailed design and analysis of a compact and highly efficient flyback converter intended for a portable solar-powered LED lighting system. This case study originated as an essential assignment within a Power Electronics course, designed to solidify students' theoretical knowledge of isolated DC-to-DC converters, while simultaneously assessing their proficiency in technical report writing. The primary objective of the design is to convert a variable 24VDC solar input into a regulated 40VDC output at 40W, critically addressing the severe lack of electricity in rural and disaster-affected zones. The methodology focused on designing the flyback topology for Continuous Conduction Mode (CCM), emphasizing the determination of the optimal transformer turns ratio (1:2.5), the selection of a 100kHz switching frequency, switching duty ratio (D) of 0.4, and precise component sizing to control voltage ripple. Simulation results, verified using PSIM software, confirmed excellent voltage regulation (achieving 39.7V) with a remarkably low peak-to-peak voltage ripple (only 0.5%, or 0.2V), alongside a simulated efficiency of approximately 94%. This study promotes a robust, sustainable, and easily maintainable power solution that directly contributes to energy access, sustainability, and electronic waste minimization in off-grid contexts.