Improved Photoelectrothermal Model with Thermal Parameters Variation Applied to an Extra-High Current COB LED

Authors

  • Dênis de C. Pereira Federal University of Juiz de Fora (Modern Lighting Research Group – NIMO), Juiz de Fora – Minas Gerais, Brazil
  • Pedro L. Tavares Federal University of Juiz de Fora (Modern Lighting Research Group – NIMO), Juiz de Fora – Minas Gerais, Brazil
  • Pedro S. Almeida Federal University of Juiz de Fora (Modern Lighting Research Group – NIMO), Juiz de Fora – Minas Gerais, Brazil
  • Guilherme M. Soares Federal University of Juiz de Fora (Modern Lighting Research Group – NIMO), Juiz de Fora – Minas Gerais, Brazil
  • Fernando L. Tofoli Federal University of São João del-Rei, São João del-Rei – Minas Gerais, Brazil
  • Henrique A. C. Braga Federal University of Juiz de Fora (Modern Lighting Research Group – NIMO), Juiz de Fora – Minas Gerais, Brazil

DOI:

https://doi.org/10.18618/REP.2019.2.0054

Keywords:

Extra-high current COB LEDs, Floodlighting, Improved photoelectrothermal modeling, Thermal parameters variation

Abstract

This work is mainly concerned with the improved photoelectrothermal (IPET) modeling of an extra-high current (EHC)
and extra-high luminous flux (up to 60 klm) solid-state light source based on a chip-on-board (COB) light-emitting diode (LED).
The studied COB technology presents the particular challenge of extremely small thermal resistances, with extra-high current
levels through the lamp (up to 12 A). Considering the unique thermal characteristics of such devices, an improved PET modeling
and its respective experimental methodology are detailed. Accurate techniques are also proposed to estimate the device junction temperature.
The studied method is very suitable to represent EHC COB devices, since it includes the main thermal parameters variation into a novel model,
optimizing the flux prediction for this technology. In this context, the static flux and efficacy are analyzed by means of experimental tests
and theoretical model, where the improvement of the employed method is highlighted.

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Author Biographies

Dênis de C. Pereira, Federal University of Juiz de Fora (Modern Lighting Research Group – NIMO), Juiz de Fora – Minas Gerais, Brazil

received the B.Sc. and M. Sc. degrees in electrical engineering from the Federal University of São João del-Rei (UFSJ), Brazil, in 2013 and 2015, respectively. He is currently working towards the Ph. D. degree in electrical engineering at the Federal University of Juiz de Fora (UFJF), Brazil. Since 2015, he has been a full-time researcher with the Modern Lighting Research Group (NIMO) at UFJF. His research interests include electronic power conversion, active power factor correction, solid-state lighting and LED driving, modeling and control of power electronic converters.

Pedro L. Tavares, Federal University of Juiz de Fora (Modern Lighting Research Group – NIMO), Juiz de Fora – Minas Gerais, Brazil

received the B.Sc. and M. Sc. degrees in electrical engineering from the Federal University of Juiz de Fora (UFJF), Brazil, in 2016 and 2018, respectively. He is currently working towards the Ph. D. degree in electrical engineering. Since 2016, he has been a full-time research with the Modern Lighting Research Group (NIMO) at UFJF. His research interests include power electronic converters and general solid-state lighting.

Pedro S. Almeida, Federal University of Juiz de Fora (Modern Lighting Research Group – NIMO), Juiz de Fora – Minas Gerais, Brazil

received the B.Sc., M.Sc., and Ph.D. degrees in electrical engineering from the Federal University of Juiz de Fora (UFJF), Brazil, in 2010, 2012, and 2014, respectively. Since 2015, he has been a Professor of electrical engineering undergraduate and postgraduate courses at UFJF. His research interests include electronic power conversion, high power factor rectifiers and active power factor correction, solid-state lighting and LED driving, and modeling and control of electronic power converters.

Guilherme M. Soares, Federal University of Juiz de Fora (Modern Lighting Research Group – NIMO), Juiz de Fora – Minas Gerais, Brazil

received the B.Sc., M.Sc., and Ph.D. degrees in electrical engineering from the Federal University of Juiz de Fora (UFJF), Brazil, in 2012, 2014, and 2017, respectively. Since 2017, he has been a Professor with the Electrical Engineering Department, UFJF. His current research interests include electronic energy conversion, power factor correction, high reliability LED drivers, and general solid-state lighting.

Fernando L. Tofoli, Federal University of São João del-Rei, São João del-Rei – Minas Gerais, Brazil

received the B.Sc., M.Sc., and Ph.D. degrees in electrical engineering from the Federal University of Uberlândia (UFU), Uberlândia, Brazil in 1999, 2002, and 2005, respectively. Since 2009, he has been a Professor with the Department of Electrical Engineering, Federal University of São João del-Rei (UFSJ), São João del-Rei, Brazil. His research interests include power-quality-related issues, highpower-factor rectifiers, non-isolated dc-dc converters with wide voltage conversion range, novel converter topologies, and solar photovoltaic systems.

Henrique A. C. Braga, Federal University of Juiz de Fora (Modern Lighting Research Group – NIMO), Juiz de Fora – Minas Gerais, Brazil

received the B.Sc. degree in electrical engineering from the Federal University of Juiz de Fora (UFJF), Juiz de Fora, Brazil, in 1982; the M.Sc. degree from Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil, in 1988; and the Ph.D. from the Federal University of Santa Catarina (UFSC), Florianópolis, Brazil, in 1996. He is currently a Full Professor with UFJF, where he teaches in the undergraduate and postgraduate programs in electrical engineering, mainly in topics regarding basic electronics and power electronics. From 2005 to 2006, he held a postdoctoral position at the University of Oviedo, Gijon, Spain. He is currently involved in several activities related to power electronics, efficient lighting, and power converters applied to renewable energy systems. Prof. Braga is a senior member of IEEE, and also a member of Brazilian Power Electronics Society.

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Published

2019-06-30

How to Cite

[1]
D. de C. Pereira, P. L. Tavares, P. S. Almeida, G. M. Soares, F. L. Tofoli, and H. A. C. Braga, “Improved Photoelectrothermal Model with Thermal Parameters Variation Applied to an Extra-High Current COB LED”, Eletrônica de Potência, vol. 24, no. 2, pp. 147–156, Jun. 2019.

Issue

Vol. 24 No. 2 (2019)

Section

Original Papers

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Copyright (c) 2019 Revista Eletrônica de Potência

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This work is licensed under a Creative Commons Attribution 4.0 International License.

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