A Novel Single-switch High Power Factor Led Driver Topology With High-frequency Pwm Dimming Capability

Pedro S. Almeida; Guilherme M. Soares; Henrique A. C. Braga

doi:10.18618/REP.2013.1.855863

Authors

Pedro S. Almeida Federal University of Juiz de Fora (UFJF) – Juiz de Fora, MG - Brazil
Guilherme M. Soares Federal University of Juiz de Fora (UFJF) – Juiz de Fora, MG - Brazil
Henrique A. C. Braga Federal University of Juiz de Fora (UFJF) – Juiz de Fora, MG - Brazi

DOI:

https://doi.org/10.18618/REP.2013.1.855863

Keywords:

LED Dimming, Off-line LED Drivers, Power Factor Correction, Single-switch LED Driver

Abstract

In this work, a novel off-line converter with power factor correction (PFC) and pulse-width modulated (PWM) dimming function employing a single active power switch is proposed for LED lighting. The proposed converter is a slightly modified flyback topology which enables the main switch to be used both for power factor correction and PWM high-frequency dimming with a constant peak on the current through the LEDs, thus conserving chromatic characteristics of emitted light. The proposed control scheme uses duty-cycle to control the light level, while switching frequency is varied along to adjust the input power and keep a constant LED peak current. The converter is able to dim LEDs without losing its PFC characteristics. Mathematical description and experimental results of a prototype with 100 W of peak power fed from 127 V mains voltage are presented in this paper to show feasibility of the novel single-switch driver proposal.

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Author Biographies

Pedro S. Almeida, Federal University of Juiz de Fora (UFJF) – Juiz de Fora, MG - Brazil

received the B.S. degree in electrical engineering from the Federal University of Juiz de Fora (UFJF) in 2010, the master degree in 2012 at the same university and is currently pursuing the PhD degree. Since 2008, he has been a researcher at the Modern Lighting Research Group (NIMO) of the Engineering School. His main research interests are electronic converters for power factor correction, solid-state lighting, discharge lamps, spectrophotometry, electronic ballasts, modeling and control of converters.

Guilherme M. Soares, Federal University of Juiz de Fora (UFJF) – Juiz de Fora, MG - Brazil

currently a master student in electrical engineering at the Federal University of Juiz de Fora (UFJF). Since 2010, he has been with in Modern Lighting Research Group (NIMO) at the same university, where he is currently a researcher. His main interests include electronic drivers for LED lighting, spectrophotometry, power factor correction and microprocessors applied to power electronics.

Henrique A. C. Braga, Federal University of Juiz de Fora (UFJF) – Juiz de Fora, MG - Brazi

obtained the B.Sc. degree in Electrical Engineering from the Federal University of Juiz de Fora (UFJF) in 1982 and teaches in this institution since 1985. He earned the Master degree in Electrical Engineering from COPPE/UFRJ in 1988. In 1996 he attained the doctor degree (Dr. Eng.) in the same field at the Federal University of Santa Catarina, INEP/UFSC. He is currently an Associate Professor at UFJF, teaching in the undergraduate and postgraduate programs in Electrical Engineering, where he is mainly concerned with the subjects of Basic Electronics and Power Electronics. From 2005 to 2006, Prof. Braga has attended a postdoctoral stage at the University of Oviedo in the Spanish city of Gijón, Asturias. He is involved in activities related to Power Electronics, Efficient Lighting and Converters Applied to Renewable Energy. He is a member of SBA, IEEE and SOBRAEP.

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