A VALLEY - FILL SEPIC - DERIVED POWER FACTOR CORRECTION TOPOLOGY FOR LED LIGHTING APPLICATIONS USING DIGITAL CONTROLLER

The high - brightness white light - emitting diode (LED) has attracted a lot of attention for its high efficacy, simple to drive, environmentally friendly, long lifespan, and compact size. The power supply for LED also requires long life, while maintaining high efficiency, high power factor, and low cost.A dimmable Light Emitting Diode (LED) driving circuit with single ended primary inductance converter (SEPIC) is presented in this paper. The other lighting system, which is in us e, is incandescent bulbs, halogen bulbs and even compact fluorescent light bulbs. The losses and environmental problems due to this is more and power quality is also less. Here the SEPIC converter is controlled with the power factor correction technique. T he one cycle control technique is done by using the digital controller(PIC16F877a microcontroller) is introduced in this paper for driving the LEDs a nd maintaining the power factor