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Multiple Heat Source Thermal Modeling and Transient Analysis of LEDs

1
Department of Electrical Engineering, Eindhoven University of Technology, 5612 AZ Eindhoven, The Netherlands
2
Research, Signify, High Tech Campus 7, 5656 AE Eindhoven, The Netherlands
*
Author to whom correspondence should be addressed.
Energies 2019, 12(10), 1860; https://doi.org/10.3390/en12101860
Received: 1 April 2019 / Revised: 9 May 2019 / Accepted: 9 May 2019 / Published: 15 May 2019
(This article belongs to the Special Issue Thermal and Electro-thermal System Simulation)
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Abstract

Thermal transient testing is widely used for LED characterization, derivation of compact models, and calibration of 3D finite element models. The traditional analysis of transient thermal measurements yields a thermal model for a single heat source. However, it appears that secondary heat sources are typically present in LED packages and significantly limit the model’s precision. In this paper, we reveal inaccuracies of thermal transient measurements interpretation associated with the secondary heat sources related to the light trapped in an optical encapsulant and phosphor light conversion losses. We show that both have a significant impact on the transient response for mid-power LED packages. We present a novel methodology of a derivation and calibration of thermal models for LEDs with multiple heat sources. It can be applied not only to monochromatic LEDs but particularly also to LEDs with phosphor light conversion. The methodology enables a separate characterization of the primary pn junction thermal power source and the secondary heat sources in an LED package. View Full-Text
Keywords: dynamic thermal compact model; LED; silicone dome; phosphor light conversion; structure function; thermal transient analysis; thermal characterization; multiple heat source; secondary heat path dynamic thermal compact model; LED; silicone dome; phosphor light conversion; structure function; thermal transient analysis; thermal characterization; multiple heat source; secondary heat path
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Alexeev, A.; Onushkin, G.; Linnartz, J.-P.; Martin, G. Multiple Heat Source Thermal Modeling and Transient Analysis of LEDs. Energies 2019, 12, 1860.

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