Merjenje temperature p-n spoja svetleče diode s pomočjo prevodne napetosti

HUMAR, MATEVŽ (author), Bizjak, Grega (mentor)

Diplomska naloga na kratko opiše zgodovino, delovanje in lastnosti svetlečih diod. Predstavljena je problematika povišane temperature svetlečih diod, zakaj jo je potrebno spremljati in jo s primernim hlajenjem obdržati v priporočenem območju. Opisanih je nekaj metod merjenja temperature p-n spoja, podrobneje pa je predstavljen standard EIA/JEDEC JESD51-1, ki določa izvajanje merjenja temperature p-n spoja z uporabo dveh tokov v prevodni smeri. Uporablja se za meritve temperature polprevodnih elementov, med katere spadajo tudi diode. V eksperimentalnem delu naloge je na osnovi standarda EIA/JEDEC JESD51-1 prikazano izvajanje meritev temperature p-n spoja petih testnih svetlečih diod. Meritve temperature na vseh petih diodah so izvedene pri sobni temperaturi, ena svetleča dioda pa je merjena tudi pri povišanih temperaturah okolice. Metoda merjenja temperature p-n spoja s pomočjo prevodne napetosti je uporabna, saj daje primerljive rezultate pri vseh petih meritvah na sobni temperaturi in tudi pri meritvah pri zvišanih temperaturah okolice. Slabost metode je njena zamudnost. Svetleče diode se med seboj razlikujejo v svoji U-I karakteristiki in spremembi napetosti na p-n spoju ob spremembi temperature. Zaradi tega je potrebno pri vsaki merjeni svetleči diodi najprej izmeriti karakteristiko odvisnosti napetosti od temperature (faktor K).

• Language: Slovenian
• Keywords: svetleča dioda, temperatura, p-n spoj, K faktor, tok
• Work type: Undergraduate thesis
• Organization: FE - Faculty of Electrical Engineering
• Year: 2016
• PID: 20.500.12556/RUL-83789
• Publication date in RUL: 30.06.2016

HUMAR, MATEVŽ, 2016, Merjenje temperature p-n spoja svetleče diode s pomočjo prevodne napetosti [online]. Bachelor’s thesis. [Accessed 1 April 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=83789

Secondary language

• Language: English
• Title: Measurement of junction temperature of LED applying forward voltage

Abstract

The following thesis includes a short description of the history, working principle and characteristics of light-emitting diodes. Presented are the problems of elevated temperature of light-emitting diodes, the importance of tracking the temperature and keeping the light-emitting diodes at the recommended temperatures by means of adequate cooling. Described in the thesis are some methods of temperature measurements of the p-n junction, with a detailed description of the EIA/JEDEC JESD51-1 standard, which determines the method for performing temperature measurements of the p-n junction by using two electric currents in forward direction. It is used for temperature measurements of semiconductor devices, including diodes. In the experimental part of the thesis, performing temperature measurements of the p-n junction of five test light-emitting diodes is presented on the basis of the EIA/JEDEC JESD51-5 standard. The temperature measurements of all five diodes are performed at a room temperature of the environment; additionally, the temperature measurement is performed at elevated temperature of the environment for one diode. The method of temperature measurement of the p-n junction by means of voltage drop is being attested as useful as it gives comparable results with all five measurements at a room temperature, as well as with elevated temperature of the environment. The disadvantage of this method is that it is time-consuming. Light-emitting diodes differ in U-I characteristic and in change of voltage on the p-n junction that is a result of a change of temperature. Therefore, characteristic dependence of the voltage on the temperature (K factor) needs to be measured at every light-emitting diode.

• Keywords: light emitting diode, temperature, p-n junction, K factor, current