Analysis and implementation of 200W LED driver circuit

High power LED's are superseding all conventional light sources and since it is current controlled, precise driver design is indispensable. The LED driver should have the capability of providing constant current regardless of the LED forward voltage variations. In this paper the DC to DC converter is designed and controlled to operate in constant current mode. A 200W LED driver is designed and calculated to verify the proposed circuit. The proposed hardware model consists of a full bridge rectifier to convert AC to DC and increases the rectified output voltage utilizing boost converter which is operated in continuous conduction mode and a quasi-half bridge LLC resonant converter to drive the LED load with coupling LLC transformer. The DC to DC converter is designed such that solid state switches of boost converter and quasi half bridge LLC converter are working under low thermal stress to reduce switching losses. The analysis, design and modelling of 200 W LED driver is carried out by hardware analysis for Universal AC mains.