LED Lighting System Switched-Mode Power Supply

Methods for achieving high efficiency are studied for 15 W SMPS using flyback converter. Transformer in sandwich form is used to reduce leakage current. MOSFETs with low on-resistance are used to reduce energy loss. Schottky diode is used for output. Condenser with low internal equivalent series resistance is used as an output electrolytic condenser. This SMPS shows efficiency of 83.1% at 220 Vac input and 1.2A output current.