Non Inverting Buck Boost PFC Based AC and DC Ripple Free LED Driver using Luminaries Without Electrolytic Capacitor

Abstract

In this paper, a low-ripple-current LED driver that does not need an electrolytic capacitor (EC) for power factor correction (PFC) is proposed. “To reduce ripple in the output current, PFC LED drivers often need large ECs. Because of the relatively limited life of ECs, there has been a rise in the desire for LED drivers that do not need ECs. Rather of using ECs, which have a limited lifespan, the suggested LED driver makes use of a non-inverting buck-boost (NIBB) power factor correction (PFC) converter and a bi-directional converter (BDC) for ripple current cancellation. In order to maintain UPF functioning, the PFC converter is constructed using a discontinuous conduction mode (DCM). The BDC is responsible for smoothing down the dc current going to the LED load by soaking up the second harmonic ac ripple current from the PFC converter. The control complexity is reduced since the BDC output voltage (vcbc) is always greater than the PFC output voltage (VLED), regardless of the ac source voltage. The MATLAB/Simulink simulation and the 7 W prototype have verified the accuracy of the theoretical analysis and predictions of the system”. According to the findings, the lifespan of the LED driver is extended because to the PFC integrated BDC’s lower ripple current with the film capacitor compared to its EC equivalent.