Analysis and improvements of a buck converter based LED driver

This paper studies a buck converter based LED driver with a current control method. A wide input voltage range is considered as well as the power factor of the circuit. To improve the efficiency soft switching conditions are provided. Simulations and experimental investigation is carried out to obtain the converter performance relations. An advanced inductor design is applied in order to reduce the eddy current losses in windings due to air gap fringing field. Combined Litz wire - full wire approach is considered to reduce the effect of air gap fringing field. Experimental results and measurements confirm the simulation results and performance of the investigated converter.