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Comparison between the CCR and PWM dimming methods on high power LEDs

Kutschenko, Wjatscheslaw and Khanh, Tran Quoc (2009):
Comparison between the CCR and PWM dimming methods on high power LEDs.
In: Proceedings of the 8th International Symposium on Automotive Lighting, pp. 554-561, 13, [Online-Edition: http://www.emk.tu-darmstadt.de/lt/isal/isal-2011/],
[Article]

Item Type: Article
Erschienen: 2009
Creators: Kutschenko, Wjatscheslaw and Khanh, Tran Quoc
Title: Comparison between the CCR and PWM dimming methods on high power LEDs
Language: English
Journal or Publication Title: Proceedings of the 8th International Symposium on Automotive Lighting
Volume: 13
Divisions: 18 Department of Electrical Engineering and Information Technology > Institute for Electromechanical Design > Light Technology
18 Department of Electrical Engineering and Information Technology > Institute for Electromechanical Design
18 Department of Electrical Engineering and Information Technology
Date Deposited: 02 Feb 2012 12:25
Official URL: http://www.emk.tu-darmstadt.de/lt/isal/isal-2011/
Alternative keywords:
Alternative keywordsLanguage
There are two commonly used dimming methods to control the light output from the LEDs, the continuous current reduction (CCR) and pulse width modulation (PWM). The PWM dimming is nowadays the prefered method in most applications of automotive lighting systems (headlamps with white LEDs at 700 mA up to 1000 mA, signaling lamps with amber and red LEDs) and in interior and display lighting systems (interior LED-luminaires and LED-color mixing equipments). The reason for these worldwide applications is the opinion that the color chromaticities and color temperature of these systems do not change if using PWM-technology. The study investigates the impact of the two dimming methods on the luminous flux, efficiency and chromaticity shift of different color and phosphor-converted white high power LEDs under different operating conditions. The results will show that in most cases the CCR method will yield much more optical efficiency than PWM. The consequence is that many important applications in the automotive lighting technology could be made more energy-efficient if using CCR dimming.English
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