Storage Capacitance Minimization In Led Drivers Based On Photometrical Constraints And Converter Integration

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

doi:10.18618/REP.2013.2.962971

Authors

Pedro S. Almeida Modern Lighting Research Group (NIMO), Federal University of Juiz de Fora (UFJF) - Campus Universitário, Plataforma 5 – CEP 36036-030 – Juiz de Fora, MG - Brazil
Guilherme M. Soares Modern Lighting Research Group (NIMO), Federal University of Juiz de Fora (UFJF) - Campus Universitário, Plataforma 5 – CEP 36036-030 – Juiz de Fora, MG - Brazil
Henrique A. C. Braga Modern Lighting Research Group (NIMO), Federal University of Juiz de Fora (UFJF) - Campus Universitário, Plataforma 5 – CEP 36036-030 – Juiz de Fora, MG - Brazil

DOI:

https://doi.org/10.18618/REP.2013.2.962971

Keywords:

Converter Integration, Electrolytic Capacitor Avoidance, LED Off-line Drivers, Photometrical Constraint on LED Ripple, LED Current Ripple

Abstract

This work proposes a novel combined approach for reducing the storage capacitances in off-line high power factor LED drivers. The proposal is to combine converter integration (power factor correction plus power control stages sharing a common switch) with photometrical constraints on the maximum allowable LED current ripple. An experimental setup was used to assess the upper limit for current ripple on the LEDs based on luminous flux drop, efficacy drop and chromaticity coordinate change. By combining the ripple design constraint obtained from photometrical measurements with the design methodology of an integrated converter, the largest storage capacitances (bus and output capacitors) were greatly reduced, allowing the use of small film capacitors of long lifespan, rather than relying on large short-lived electrolytic capacitors. As a design example, an integration between a SEPIC power factor preregulator and a buck-boost power control stage was chosen and a prototype was built, fed from 220 V / 60 Hz mains voltage and feeding 56 series-associated LEDs (ca. 70 W). The driver imposed a 50% current ripple on the LEDs, value for which it was found to yield only 0.2% decrement in luminous flux, while preserving color stability.

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Author Biographies

Pedro S. Almeida, Modern Lighting Research Group (NIMO), Federal University of Juiz de Fora (UFJF) - Campus Universitário, Plataforma 5 – CEP 36036-030 – 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, Modern Lighting Research Group (NIMO), Federal University of Juiz de Fora (UFJF) - Campus Universitário, Plataforma 5 – CEP 36036-030 – 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, Modern Lighting Research Group (NIMO), Federal University of Juiz de Fora (UFJF) - Campus Universitário, Plataforma 5 – CEP 36036-030 – Juiz de Fora, MG - Brazil

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 Gijon, 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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