Interleaved DCM Buck-Boost PFC LED Driver

In this paper, an overview of interleaved DCM buck-boost PFC LED driver is presented. The proposed LED driver is designed to operate in discontinuous inductor current conduction mode (DCM) to make use of its obvious benefits such as inherent high power factor and low THDi, simple control (single loop control), excellence efficiency due to inherent zero current switching at turn-on time of the switches and inherent zero diode reverse recovery loss. The adoption of an interleaving technique can reduce the size of passive power components, which can enhance LED driver's performance and efficiency. This benefit reduces costs, size and weight of LED drivers. The computer software simulations was used to simulate the performances of the proposed LED driver. Experimental results indicate that the characteristics and operations of the LED driver are similar to the simulation results. In addition, the prototype of interleaved DCM buck-boost PFC LED driver was implemented and tested in laboratory, PF 0.9918 and efficiency 92.67%.