Parameteridentification of LED models

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Supervisor:
Dr. Poppe András
Department of Electron Devices

The semiconductor light emitting technology made a huge development in the past decade. Their scotopic flux and luminous efficacy make the LEDs that are used nowadays suitable than the traditional lightening devices. However, because of the good designing there is a need for such models, which simulate the LEDs operation correctly. It ensures better accuracy through the planning, making the areas of wider usage.

My thesis aims to present a short discussion about the standard measurement of power LEDs. As part of this, it shows the thermical transient measurement of packages for semiconductor devices, and also the combinated thermal-optical measurement of power LEDs. It also describes two recently published LED models with their detailed explanation and the relation of their parameters. It proposes the possibility of model's specification and implementation, and describes the motivation of numerical optimizational method used in the LED modeling. It contains the detailed description of simplex method used by myself for the simulation, and also the rates on the basic of parameter extraction, which I made based on earlier publications.

I compared the available measurements with the results of the LED simulator, which is under the Department of Electron Devices innovation, and with the help of the downhill simplex method I calculated parameters owning the to minimizing the difference between the rates. As I was fulfilling my work accoring to the task description I was taking several different aspects into consideration.

The purpose of my thesis is to present an implementation of a robust numerical optimizing algorithm and fit it into the Department of Electron Devices application on the basic of LED, which is under their innovation. And last, but no least I also intended to calculate the optimal parameters wiht applying the simplex method for the department's model.

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