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Reducing the stroboscopic effects of LED luminaires with pulse width modulation control

Polin, Dmitrij and Klir, Stefan and Wagner, Max and Khanh, Tran Quoc :
Reducing the stroboscopic effects of LED luminaires with pulse width modulation control.
In: Lighting Research and Technology (LRT) (online first) pp. 1-11. ISSN 1477-0938
[Article] , (2016)

Abstract

Pulse width modulation for dimming the light output of LEDs has become common. When pulse width modulation is used at low frequencies unwanted visual artefacts including flicker perception and stroboscopic effects may occur. These artefacts need to be avoided or at least reduced to a minimum in order to obtain high user acceptance. In this paper, an optimized phase-shifted pulse width modulation method is described, implemented and validated in a visual experiment. The method is intended to minimize the stroboscopic effect on a reference surface by first optimizing the LED units of a single LED luminaire and then co-optimizing several of these luminaires. The optimized pulse width modulation waveforms are then compared to standard pulse width modulation dimming methods. In the visual experiment, 13 subjects rated the extent of the stroboscopic effect of standard and optimized waveforms in a white painted experimental room. The results indicate that the optimized waveforms are indistinguishable from constant light.

Item Type: Article
Erschienen: 2016
Creators: Polin, Dmitrij and Klir, Stefan and Wagner, Max and Khanh, Tran Quoc
Title: Reducing the stroboscopic effects of LED luminaires with pulse width modulation control
Language: English
Abstract:

Pulse width modulation for dimming the light output of LEDs has become common. When pulse width modulation is used at low frequencies unwanted visual artefacts including flicker perception and stroboscopic effects may occur. These artefacts need to be avoided or at least reduced to a minimum in order to obtain high user acceptance. In this paper, an optimized phase-shifted pulse width modulation method is described, implemented and validated in a visual experiment. The method is intended to minimize the stroboscopic effect on a reference surface by first optimizing the LED units of a single LED luminaire and then co-optimizing several of these luminaires. The optimized pulse width modulation waveforms are then compared to standard pulse width modulation dimming methods. In the visual experiment, 13 subjects rated the extent of the stroboscopic effect of standard and optimized waveforms in a white painted experimental room. The results indicate that the optimized waveforms are indistinguishable from constant light.

Journal or Publication Title: Lighting Research and Technology (LRT)
Number: online first
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: 16 Apr 2017 20:58
Additional Information:

doi 10.1177/1477153515615934

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