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Electrical, Control and Communication Engineering

The Journal of Riga Technical University

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2255-9159
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Dimmable LED Drivers Operating in Discontinuous Conduction Mode

Olegs Tetervenoks / Irena Milashevski
Published Online: 2013-05-11 | DOI: https://doi.org/10.2478/ecce-2013-0004

Abstract

For the modern smart lighting systems one of the most attractive LED advantages is the dimming possibility. Many researchers and engineers from the field of lighting engineering are trying to find compromise between the efficiency of LED dimming process and the ease of its implementation. This paper also presents an attempt to improve LED dimmer parameters. Comparative investigation of the operation of buck LED drivers in continuous conduction mode and discontinuous conduction mode are discussed here. The first section of paper briefly describes the controllability parameters of the converter in both of these modes. The positive impact of discontinuous conduction mode on the controllability parameters as well as the results of the analytical estimation and the results of associated experiments are summarized at the end of the first section. The second section describes the impact of discontinuous conduction mode on the losses of LED dimmer. The analytical estimation of power losses in the main converter components for both operation modes as well as the summary of the experiments to identify distribution of power losses between these components are presented in this section. Finally, the conclusions about using discontinuous conduction mode for dimmable LED lamps as well as guidelines for the choosing of the components with the most appropriate parameters are drawn

Keywords: Lighting; LED lamps; controllability; electrical ballasts; DC-DC power converters

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About the article

Olegs Tetervenoks

Olegs Tetervenoks received his Bachelor’s Degree with Engineer qualification (2010) and Master’s (2011) Degree in the field of electrical engineering at Riga Technical University, Faculty of Power and Electrical Engineering. Since 2011 he has been studying for his PhD at Riga Technical University. The Bachelor thesis was focused on solid state lighting technology development, in particular, on efficient LED power supply development. The Master thesis was devoted to LED light source efficiency evaluation equipment. The area of scientific interests of Olegs Tetervenoks covers microprocessor control systems and LED lighting technologies. The working experience of Olegs Tetervenoks includes 2 years of research job at Riga Technical University. Olegs Tetervenoks is IEEE member since 2011. Postal address: Institute of Industrial Electronics and Electrical Engineering, Riga Technical University, Kronvalda boulevard 1, Riga LV- 1010, Latvia.

Irena Milashevski

Irena Milashevski received her B.Sc. degree in Electrical Drives and Power Electronics in 2006 and M.Sc. degree in the same field in 2008 in Tallinn University of Technology. Since 2008 she has been studing for her PhD at Tallinn University of Technology (the thesis has been presented and degree – received in January 2013). From 2006 she has working in electrical engineering company KH Energia-Konsult Plc as electrical designer and consulter. Her research interests include LEDs and their electronics ballasts energy efficiency, quality and economical problems in the lighting field. Postal address: Department of Electrical Engineering, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia.


Published Online: 2013-05-11

Published in Print: 2013-04-01


Citation Information: Electrical, Control and Communication Engineering, ISSN (Online) 2255-9159, ISSN (Print) 2255-9140, DOI: https://doi.org/10.2478/ecce-2013-0004.

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