Simulation of Open Loop and Closed Loop Synchronous Buck Converter for LED Applications

Abstract: The demand of energy efficient lighting system is very essential in today's scenario. This is because the amount of energy consumption by lighting sources is approximately 20% of total electrical energy consumed in the world. In the recent years, LED lighting has emerged as a better energy efficient and eco-friendly solution for the residential and commercial lighting requirement. LED works on DC power and therefore it requires a device that can convert available AC power to DC power and regulate the current flowing through the LED during its operation. Thus to protect LED from line voltage fluctuations, a proper driver circuit is needed. In this paper the design of driver circuit for LED bulb with a synchronous buck converter is described. The simulation of driver circuit for both open loop and closed loop are done in MATLAB/SIMULINK software. Keywords: LED, Synchronous buck converter, LED driver circuit, Open loop and Closed loop system.