Development and Analysis of a Modular LED Array Light Source
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 ou...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-10-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/7/4/92 |
| _version_ | 1797551031856398336 |
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| author | Stefan Mitterhofer Žiga Korošak Žiga Rojec Marko Jankovec Marko Topič |
| author_facet | Stefan Mitterhofer Žiga Korošak Žiga Rojec Marko Jankovec Marko Topič |
| author_sort | Stefan Mitterhofer |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-10T15:38:58Z |
| format | Article |
| id | doaj.art-e59f8d37166148709c34e5ec6db56c7b |
| institution | Directory Open Access Journal |
| issn | 2304-6732 |
| language | English |
| last_indexed | 2024-03-10T15:38:58Z |
| publishDate | 2020-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Photonics |
| spelling | doaj.art-e59f8d37166148709c34e5ec6db56c7b2023-11-20T17:00:46ZengMDPI AGPhotonics2304-67322020-10-01749210.3390/photonics7040092Development and Analysis of a Modular LED Array Light SourceStefan Mitterhofer0Žiga Korošak1Žiga Rojec2Marko Jankovec3Marko Topič4Faculty of Electrical Engineering, University of Ljubljana, Tržaška Cesta 25, 1000 Ljubljana, SloveniaFaculty of Electrical Engineering, University of Ljubljana, Tržaška Cesta 25, 1000 Ljubljana, SloveniaFaculty of Electrical Engineering, University of Ljubljana, Tržaška Cesta 25, 1000 Ljubljana, SloveniaFaculty of Electrical Engineering, University of Ljubljana, Tržaška Cesta 25, 1000 Ljubljana, SloveniaFaculty of Electrical Engineering, University of Ljubljana, Tržaška Cesta 25, 1000 Ljubljana, SloveniaLight 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.https://www.mdpi.com/2304-6732/7/4/92light emitting diodelighting systemirradiance optimizationdegradation |
| spellingShingle | Stefan Mitterhofer Žiga Korošak Žiga Rojec Marko Jankovec Marko Topič Development and Analysis of a Modular LED Array Light Source Photonics light emitting diode lighting system irradiance optimization degradation |
| title | Development and Analysis of a Modular LED Array Light Source |
| title_full | Development and Analysis of a Modular LED Array Light Source |
| title_fullStr | Development and Analysis of a Modular LED Array Light Source |
| title_full_unstemmed | Development and Analysis of a Modular LED Array Light Source |
| title_short | Development and Analysis of a Modular LED Array Light Source |
| title_sort | development and analysis of a modular led array light source |
| topic | light emitting diode lighting system irradiance optimization degradation |
| url | https://www.mdpi.com/2304-6732/7/4/92 |
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