Minicurso PPEE: Introduction to LED drivers (Introdução aos Controladores de LEDs)

Palestrante: Prof. Marcos Alonso, Ph.D.
University of Oviedo, Spain

Abstract:

LEDs are becoming an attractive light source owing to their high reliability, long life, high color rendering index and small size. In addition, there are commercially available units that can reach a luminous efficacy as high as 100 lumen/W. These features make LEDs excellent candidates to override fluorescent and other discharge lamps in many applications, including street-lighting, automotive lighting, decorative applications and household appliances. However, power LEDs are still far from being a panacea since they still suffer from several drawbacks. First, due to their nearly constant-voltage behavior, they cannot be supplied from the dc or ac voltage source directly. Therefore, some kind of current-limiting device must be used, similarly to the ballast used to limit the current through a discharge lamp. On the other hand, the high efficacy of power LEDs is only maintained under tight operating conditions, which include low direct current and low junction temperature. This tutorial will deal with topics related to LED driving, including: introduction to lighting and vision, color theory, color mixing, LED behavior and modeling, thermal management, dimming, DC-supplied LED drivers and off-line LED drivers.

Biography:

 J. Marcos Alonso (S’94, M’98, SM’03) received the M.Sc. Degree and Ph.D. both in electrical engineering from the University of Oviedo, Spain, in 1990 and 1994 respectively. Since 2007, he has been appointed as full Professor at the Electrical Engineering Department of the University of Oviedo.

Prof. Alonso is co-author of more than three hundred journal and conference publications. His research interests include electronic ballasts, LED power supplies, power factor correction and switching converters in general. He was supervisor of eight Ph.D. Thesis and he is the holder of seven Spanish patents.

Prof. Alonso has been awarded with the Early Career Award of the IEEE Industrial Electronics Society in 2006. He was honoured with the University of Oviedo Electrical Engineering Doctorate Award for 1996. He also holds three IEEE paper awards. Since October 2002 he serves as an Associate Editor of the IEEE Transactions on Power Electronics. He has been Co-Guest Editor of two special issues in lighting applications published in the IEEE Transactions on Power Electronics (2007) and IEEE Transactions on Industrial Electronics (2012) and has co-organized several conference special sessions. Since October 2012, he also serves as secretary of the IEEE IAS Industrial Lighting and Display Committee (ILDC). He has been elected as Member-at-Large of the IEEE IAS Executive Board for the term 2013-2014. He is also member of the European Power Electronics Association and he belongs to the International Steering Committee of the European Conference on Power Electronics and Applications (EPE), where he has collaborated as topic co-chair since 2007.