Single-Stage, Single-Switch Soft-Switched Integrated Forward-Flyback Converter for LED Drivers Applications

This paper presents a single-stage, single-switch forward-flyback converter for driving a dual-branch LED driver. Operating in Discontinuous current mode, the flyback stage enables automatic current sharing, eliminating the need for current control. A snubber capacitor enhances soft switching, reducing losses and improving efficiency. The proposed design ensures equal current distribution between LED branches just by utilizing one capacitor in its structure. Additionally, DCM operation minimizes the output current dependence to the output voltage variation of LED string according to temperature changes. The paper includes an operational analysis, experimental validation, and a comparative study with existing DC-DC converters.