LED compact model development

A. Alexeev

Research output: ThesisEngD Thesis


Thermal management of LEDs is one of the key aspects for achieving performance and lifetime of lighting systems. A major part of the electrical power applied to a typical mid-power LED is converted into heat. Excess of the heat leads to high temperature load. High junction and phosphor particles temperatures decrease reliability and efficiency of LEDs.
In LED, electrical, optical, thermal performances are all inter-twined leading to challenges in identifying the LED performances in an end system working conditions. In this report a thermal compact model of the LED is proposed to mimic the behavior of the LED in its working spectrum. A compact model is a substitution for complex finite element calculations. The end goals are reduction of time and computing resources required for evaluation of LEDs thermal properties as well as improvement of prediction accuracy. An approach combining measurements and simulations techniques is employed.
The main goal is to identify the route to create compact thermal models using measurements. Simulations are performed In order to understand the key aspects involved. The proposed model can be used for prediction of the crucial thermal parameters of mid-power LEDs for a wide range of boundary conditions.
The project is devoted to Mid-power LEDs exclusively. The report focuses on compact model development. All other aspects like measurement accuracy analysis, estimation of reproducibility, boundary conditions identification, ANSYS model verification are presented in papers attached as appendixes.
Several types of compact models are proposed and analyzed. A compact model creation procedure and accuracy estimation algorithms are given. The most advanced model is verified with the experiments, transient and steady-state the ANSYS simulations for LL3030 LED.
The compact model extraction accuracy improvement recommendations are given. Measurement techniques, their drawbacks and bottlenecks are highlighted. Additional drawbacks of T3Ster transient measurements are found.
Original languageEnglish
Awarding Institution
  • Zeegers, Jos C.H., Supervisor
  • Martin, Genevieve Y., External supervisor
Award date14 Jun 2016
Place of PublicationEindhoven
Publication statusPublished - 14 Jun 2016

Bibliographical note

PDEng thesis. - Confidential for ever.


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