Measurement of the Thermal Impedance of Light-Emitting Diodes and Light-Emitting Diode Matrices
- Authors: Smirnov V.I.1,2, Sergeev V.A.1,2, Gavrikov A.A.1
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Affiliations:
- Ulyanovsk Branch, Kotelnikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences
- Ulyanovsk State Technical University
- Issue: Vol 60, No 1 (2017)
- Pages: 46-51
- Section: Article
- URL: https://journals.rcsi.science/0543-1972/article/view/246068
- DOI: https://doi.org/10.1007/s11018-017-1157-8
- ID: 246068
Cite item
Abstract
A measuring instrument of the frequency and current dependences of the modulus and phase of the thermal impedance of LEDs and LED matrices of 100 W and higher is described. The principle of operation of the measuring instrument is based on the transmission through LEDs of a sequence of impulses of direct current that is pulse-width modulated under the harmonic law, and the determination of the variable component of the temperature of the p–n junction of the LED as the voltage changes during intervals between current impulses. An algorithm is presented to determine the component of full thermal resistance of an LED or an LED matrix from the results of processing the frequency dependences of the modulus and phase of the thermal impedance. Examples of implementation of the algorithm are given.
Keywords
About the authors
V. I. Smirnov
Ulyanovsk Branch, Kotelnikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences; Ulyanovsk State Technical University
Author for correspondence.
Email: sva@ulstu.ru
Russian Federation, Ulyanovsk; Ulyanovsk
V. A. Sergeev
Ulyanovsk Branch, Kotelnikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences; Ulyanovsk State Technical University
Email: sva@ulstu.ru
Russian Federation, Ulyanovsk; Ulyanovsk
A. A. Gavrikov
Ulyanovsk Branch, Kotelnikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences
Email: sva@ulstu.ru
Russian Federation, Ulyanovsk