Comparative study of Single-Stage AC-DC Converters for LED Lighting with Power factor Correction

Abstract: In recent years, LED light sources are widely used compared to the conventional light bulbs due to their compactness, lower heat dissipation, high levels of luminous efficiency, wide chromatic variety, high reliability, extreme robustness and long life term. But the main concern is to have high power quality LED power supplies in order to comply with the international standards. To ensure this and to maintain a high power factor at the line side, switch- mode DC-DC converters i.e High-frequency active PFC circuit generally known as „Power Factor Correction‟ circuits, are designed. In this paper, a comparative analysis of the AC-DC Converter topologies with “Active” Power Factor Correction for LED applications is presented. Simulation studies have been carried out using MATLAB/SIMULINK. Performance parameters such as Supply Power factor, Distortion factor and supply current THD are analysed for the various active AC-DC converter topologies and the results are compared.

Keywords: LED, SEPIC Converter, THD, Power factor correction (PFC)