A technique for producing high power factor for HB-LEDs power supply based on boost topology

This topology presents simple and economical method of power factor correction for driving High-Brightness LEDs based on Boost converter. Nowadays, HB-LEDs are discussed as a noticeable lighting instrument because of their great Longevity, multicolored, and Compatible with Environment. It works by sampling of the input and output voltage and current in the boost converter, whereupon, improving the input power factor and reduction the line current´s Total Harmonic Distortion (THD). Recently, power factor correction (PFC) has become an essential part of new power supply designs. The proposed converter shows a power supply for HB-LED which could work under a large AC input voltage range and obtains high power quality. It is a single stage, low cost and high efficiency. The UC3854 with fast control loop is used to improve power factor and enabling the PWM dimming. We tested this control method by simulating and both converters built in the laboratory and final results compared to open loop converter.