Design consideration of modified SEPIC converter for LED lamp driver

In recent years, LED light sources have been used in more applications than conventional light bulbs due to their compactness, lower heat dissipation, high levels of luminous efficiency, real-time color changing capability and most importantly their long time of life. This paper presents a new proposal of LED lamp driver using the modified SEPIC converter as a practical driver. The proposed Modified SEPIC enables the use of lower voltage rated semiconductors compared to other single-switch buck-boost derived topologies with a resulting performance comparable to the boost topology. The proposed circuit has also the advantages of single switch, small magnetic and simple controller. In this paper, the basic operating principles of the proposed topology are firstly illustrated in details, and secondly some simulated results are provided to demonstrate the effectiveness of the proposed topology. A laboratory prototype was built to verify the feasibility of the proposed LED Lamp driver.