A single-stage high efficiency long-life off-line LED driver based on the DCM Cuk converter

This work proposes an off-line LED driver, based on the Cuk converter operating in discontinuous conduction mode. Complete analysis of the converter is carried out and a design methodology is presented, focused in reducing output filtering capacitance, still achieving acceptable current ripple on the output and eliminating the need for electrolytic capacitors. Photometric data is gathered and fed into the design methodology in order to optimize output current ripple selection and capacitor reduction. Experimental results were obtained from a high power factor high efficiency prototype feeding 56 series-associated high-power LEDs from 220 VAC-60 Hz mains.