Advanced Reduction in Power Redundant for High-Efficient Electrolytic-Capacitor-less Off-Line LED Driver

Abstract

This paper proposes a high-efficient electrolytic capacitor less off-line Light Emitting Diode (LED) driver that features a reduced power processing by the ripple reduction converter. The AC-DC driver is the Parallel Buck-Boost and Boost Converter (PB3C). The converter shows a high Power Factor (PF), low Total Harmonic Distortion (THD), and high efficiency. The two stages of the converter are not connected in cascade (series) mode, but they are connected in parallel mode, which produces a reduction in the circulating power in the converter. Furthermore, the IB3C is a two-stage driver that features two switches, one to control the LED current and the other to eliminate the ripple in the current. For further enhancement, the amount of circulating power is controlled in order to ensure a high efficiency. In this paper, the IB3C is analyzed, and a design methodology is proposed. A fully functioning simulation supplying an LED luminaire of 104.75 V/ 1.75 A is implemented. The simulation results of the IB3C shows a high PF equal to 0.99, a very small THD of 6 %, output current ripple reduction from of 100 % to 2 %, which represents a landmark in the ripple reduction methodologies.