Lifetime Modelling Issues of Power Light Emitting Diodes

Hegedüs, János; Hantos, Gusztáv; Poppe, A.

doi:10.3390/en13133370

Cited by 19 publications

(10 citation statements)

References 46 publications

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“…The implemented model will be extended in future work with a chip-level multi-domain model to obtain a fully realized LED digital twin. Another useful addition to the luminaire-level model is to include lifetime prediction [39], which will be the subject of a follow up paper. Funding: This research received no external funding.…”

Section: Discussionmentioning

confidence: 99%

Digital Luminaire Design Using LED Digital Twins—Accuracy and Reduced Computation Time: A Delphi4LED Methodology

Schans

Martin

2020

Energies

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Light-emitting diode (LED) digital twins enable the implementation of fast digital design flows for LED-based products as the lighting industry moves towards Industry 4.0. The LED digital twin developed in the European project Delphi4LED mimics the thermal-electrical-optical behavior of a physical LED. It consists of two parts: a package-level LED compact thermal model (CTM), coupled to a chip-level multi-domain model. In this paper, the accuracy and computation time reductions achieved by using LED CTMs, compared to LED detailed thermal models, in 3D system-level models with a large number of LEDs are investigated. This is done up to luminaire-level, where all heat transfer mechanisms are accounted for, and up to 60 LEDs. First, we characterize a physical phosphor-converted white high-power LED and apply LED-level modelling to produce an LED detailed model and an LED CTM following the Delphi4LED methodology. It is shown that the steady-state junction temperature errors of the LED CTM, compared to the detailed model, are smaller than 2% on LED-level. To assess the accuracy and the reduction of computation time that can be realized in a 3D system-level model with a large number of LEDs, two use cases are considered: (1) an LED module-level model, and (2) an LED luminaire-level model. In the LED module-level model, the LED CTMs predict junction temperatures within about 6% of the LED detailed models, and reduce the calculation time by up to nearly a factor 13. In the LED luminaire-level model, the LED CTMs predict junctions temperatures within about 1% of LED detailed models and reduce the calculation time by about a factor of 4. This shows that the achievable computation time reduction depends on the complexity of the 3D model environment. Nevertheless, the results demonstrate that using LED CTMs has the potential to significantly decrease computation times in 3D system-level models with large numbers of LEDs, while maintaining junction temperature accuracy.

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Section: Discussionmentioning

confidence: 99%

Digital Luminaire Design Using LED Digital Twins—Accuracy and Reduced Computation Time: A Delphi4LED Methodology

Schans

Martin

2020

Energies

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“…Accordingly, junction temperature increases continuously during aging even if the thermal resistance remains unchanged, and therefore this increase becomes even more significant in case of any possible degradation of the main heat conduction path. The details of this proposal have already been discussed in detail in a previous article [36]. In this article characteristics of the LED samples under investigation are only considered.…”

Section: Bmentioning

confidence: 99%

Lifetime Test of Pulsewidth Modulated LEDs Supplemented With Thermal Investigations

Hegedüs

Hantos

Lukacs

et al. 2023

IEEE Trans. Compon., Packag. Manufact. Technol.

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The ability to dim LEDs is a big advantage compared to previous light sources, but it can also lead to new aging mechanisms. Due to the different coefficients of thermal expansion of the individual structural layers, the temperature cycle can negatively affect the main thermal path. In this article, we investigate how different dimming frequencies influence the aging of LEDs and to what extent they impair the thermal conductivity of structural layers belonging to different thermal time constants. In this paper the methodology of the joint examination of the integral structure function and the time constant spectrum is described, i.e. the determination of the time constants and the frequency values that expose the individual structural layers to the most mechanical stress. The theoretical results are demonstrated using an LM-80 based LED lifetime test supplemented with thermal transient testing which is also presented in this paper.

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“…Research [3] shows that about 70% of LED damage is caused by excessively high junction temperature, and changes in luminous flux are a function of luminophore degradation under the influence of increased temperature. Furthermore, LEDs generate more heat as they age, e. g. [4].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the LED lamp

2021

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LEDs are widely used light sources. Their main advantages are low power consumption, mechanical strength, high luminous efficacy, and a lifetime exceeding 50 000 hours. However, compared to other light sources, they are more sensitive to high temperatures. Heat is generated by converting electrical energy into radiant energy. The share of heat in this transformation describes the efficiency, but in the case of light sources, efficiency is not one of the basic parameters because only a part of the radiation produced is visible light, which interests the recipients. However, the temperature has a big influence on the properties and lifetime of LEDs. This article presents the results of temperature measurements of the LED lamp.

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Lifetime Modelling Issues of Power Light Emitting Diodes

Cited by 19 publications

References 46 publications

Digital Luminaire Design Using LED Digital Twins—Accuracy and Reduced Computation Time: A Delphi4LED Methodology

Digital Luminaire Design Using LED Digital Twins—Accuracy and Reduced Computation Time: A Delphi4LED Methodology

Lifetime Test of Pulsewidth Modulated LEDs Supplemented With Thermal Investigations

Experimental study of the LED lamp

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