Bridgeless Converter For An LED Street-Lighting Applications

Abstract: As the country is developing the usage of electric energy is increasing and the cost is also increasing with reduced efficiency and the power factor. Since the utility charges for electricity even by considering the power factor so, to improve the circuit, to increase the efficiency and to improve the power factor this model is proposed. For energy savings light emitting diodes are used due to its attractive features. This paper proposes a bridgeless converter circuit for supplying light emitting diode street-lighting module. This converter contains integrated bridgeless converter with half bridge LLC series resonant converter so that we can obtain zero voltage switching across the power switches and zero current switching across the two output rectifier diodes. Here we designed the circuit for supplying 150W with the supply voltage ranging from 200V to 230V. The circuit features are cost-effective, efficiency increases due to one-stage of power conversion and power factor is improved compared to the conventional two-stage circuit. The circuit simulation has been carried out in MATLAB/Simulink.

Keywords: Bridge-less ac-dc conversion, half-bridge type LLC Resonant converter, power factor correction.