Abstract
It has been noticed that in commerciallighting, in terms of efficiency light-lamps based on lightemitting diodes(LEDs) are far better as compared to thosewhere traditional high-pressure sodium (HPS) lampswhich are still in use in major underdeveloped anddeveloping areas worldwide in specifically street lighting.The LED driver is an electrical device which controlspower flow to the single LED or a string of the LEDs orcontrols to the current flowing through the LEDs.Available conventional topologies for LED drivers haveseveral demerits such as flickering issues, high losses,luminance problems, low power factor, more number ofswitches etc. So, the need of the hour is to develop efficient,compact, long lifetime, high power factor and flicker-freeLED drivers. The LED have numerous advantages such ashigh luminous efficiency, life span and it has no mercuryin its composition. Therefore, recently researchers of thisarea has been setting a goal to utilize LED as a goodalternative to save electricity from major parts of thisplanet.In this paper, various topologies of LED drivers arepresented. This paper also portrays simulation of a LEDdriver which is based on the combination of the buckboost converter as power factor correction stage (PFC)and buck converter as dc-dc power conversion (PC) stage.Both the stages are integrated using single switch only so itis basically integrated LED driver circuit.
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