Modelling and Control of Two Stage High PFC LED Driver Circuit using Average Current Control Method Driven by Vienna Rectifier

This Paper presents a two stage LED driver topology fed via a single-phase Vienna Rectifier which is modified form of a single leg of three phase Vienna Rectifier. Use of Vienna Rectifier in place of conventional bridge rectifier not only improves power quality with high input power factor, lower Total Harmonics Distortion (THD), half the number of switch requirement, higher efficiency with reduced voltage stress on active switches and probable standards within IEC61000-3-2 for class C load. LED works on constant current or constant voltage mode which is driven by a driver circuit (AC-DC system) .Effective LED driver topologies comes in two or three stage configuration to improve the power quality and efficiency, here second stage is driven by a Boost converter controlled by Average Current mode controller to obtained the desired Phase Margin and Gain Margin for stability. The modeling, control and simulation of the driver circuit is presented for LED load.