Stefan Mitterhofer (Author), Žiga Korošak (Author), Žiga Rojec (Author), Marko Jankovec (Author), Marko Topič (Author)

Abstract

Light emitting diodes (LEDs) have experienced rapid technological development in the past decade, making them a winning alternative to conventional light sources in many applications. LED arrays allow precise control of the desired irradiance profile in a target area by adjusting the position and output power of individual LEDs. However, despite increased efficiency, many LEDs still transform a large proportion of the input electrical power into heat, requiring an efficient cooling system. This paper presents a modular LED array light source mounted on a water-cooled aluminum plate. Novel electronic LED driver modules, connected via a serial communication bus in a daisy-chain topology, were developed with the ability to set the operating current of individual LEDs. A modular layout of cooling and mounting system and LED driver modules, as well as a specialized design for the LED soldering footprint, was able to house a variety of common commercial LEDs, enabling easy adjustment of the lighting system to the required application and size of the irradiated area. In a prototype of one plate containing 10 LEDs, individual LED radiance was optimized for a better irradiance homogeneity in the target area. Array characterization showed a low standard deviation of the irradiance of 1.8% and a good fit between measured and calculated irradiance. A test of the array at elevated temperatures showed moderate LED radiance degradation and a wavelength shift of the measured spectra after extended use.

Keywords

LED;svetlobni viri;light sources;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FE - Faculty of Electrical Engineering
UDC: 621.383.51
COBISS: 42913027 Link will open in a new window
ISSN: 2304-6732
Views: 156
Downloads: 152
Average score: 0 (0 votes)
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Other data

Secondary language: Slovenian
Secondary keywords: LED;svetlobni viri;
Type (COBISS): Article
Pages: str. 1-16
Volume: ǂiss. ǂ4
Issue: 92
Chronology: Dec. 2020
DOI: 10.3390/photonics7040092
ID: 14305974
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