Comparison of integrated SEPIC-Buck and SEPIC-Ćuk converters as off-line dimmable LED drivers with reduced storage capacitor

This paper presents comparison of two integrated DC-DC converters topologies, SEPIC-Buck and SEPIC-Ćuk as off-line dimmable LED drivers from a storage capacitance reduction point of view. Considering the low lifetime of electrolytic capacitors compared to that of LEDs, this study presents an analysis and design of two topologies which allows replace electrolytic capacitor by longer lifetime capacitor technology. Therefore it is necessary a significant storage capacitance reduction which is possible due to the proposed output current control strategy. Moreover the integrated topologies are compared in terms of efficiency and storage capacitance reduction.