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

Polin, Dmitrij ; Klir, Stefan ; Wagner, Max ; 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
[Artikel], (2016)

Kurzbeschreibung (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.

Typ des Eintrags: Artikel
Erschienen: 2016
Autor(en): Polin, Dmitrij ; Klir, Stefan ; Wagner, Max ; Khanh, Tran Quoc
Titel: Reducing the stroboscopic effects of LED luminaires with pulse width modulation control
Sprache: Englisch
Kurzbeschreibung (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.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Lighting Research and Technology (LRT)
(Heft-)Nummer: online first
Fachbereich(e)/-gebiet(e): 18 Fachbereich Elektrotechnik und Informationstechnik > Institut für Elektromechanische Konstruktionen > Lichttechnik
Hinterlegungsdatum: 16 Apr 2017 20:58
Zusätzliche Informationen:

doi 10.1177/1477153515615934

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