A PFI Bridgeless Cuk Converter-Based LED Lamp Drive

Present paper deals with modelling, designing, and simulation of a power factor improved (PFI) LED (Light Emitting Diode) drive system. To maintain power quality as per IEC-61000-3-2 standards (which govern the limits on permissible harmonic contents) presented LED drive system uses a bridgeless Cuk converter for PFI operation. The bridgeless Cuk converter uses a common output inductor during both supply voltage cycles which eliminates the requirement of one extra inductor with respect to conventional Cuk converter bridgeless operation. The bridgeless PFI Cuk converter feeds the flyback converter which feeds the LED lamp load. To reduce the requirement of extra sensors the LED drive system is operated in discontinuous inductor current mode (DiCM). Simulation results are presented in this paper for the validation of the drive system for a LED lamp load of 18 W.