Abstract: High brightness light-emitting diodes are considered as a remarkable lighting device due to their high reliability and chromatic variety. In this paper a three stage solution and design of the led driver proposed, Power factor correction achieved by boost converter, galvanic isolation by electronic transformer and current regulation by buck converter at the last stage. A design of led driver with high reliability proposed in the paper.

Keywords: AC-DC Power converter, Electronic transformer, Light-emitting diodes (LED), Three-Stage topology, Two-input buck converter.