Comparative analysis of power LEDs dimming methods

Light emitting diodes (LEDs) have many features that make them very attractive for use in lighting. The main features that stand out is its small size compared to incandescent and fluorescent lamps. Also, they have high luminous efficiency, long lifetime and are resistant to shocks and vibrations, w...

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Published inIECON 2011 - 37th Annual Conference of the IEEE Industrial Electronics Society pp. 2907 - 2912
Main Authors Rodrigues, W.A., Morais, L.M.F., Donoso-Garcia, P.F., Cortizo, P.C., Seleme, S.I.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.11.2011
Subjects
Inductors
Light emitting diodes
Lighting
Pulse width modulation
Switching frequency
Temperature
Temperature measurement
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Summary:Light emitting diodes (LEDs) have many features that make them very attractive for use in lighting. The main features that stand out is its small size compared to incandescent and fluorescent lamps. Also, they have high luminous efficiency, long lifetime and are resistant to shocks and vibrations, which contributes to increasing their reliability. This paper presents a current source for Power LEDs. As the luminous intensity of LEDs is directly related to the direct current flowing through them, this source must have characteristics of current source. Two methods of dimming LEDs are analyzed: continuous variation of current and pulse width modulation (PWM). These methods are implemented, tested and compared. A current loop to control the current through the LEDs is designed to keep the current in the LEDs always constant, so that the luminous flux emitted by them does not change.
ISBN:9781612849690
1612849695
ISSN:1553-572X
DOI:10.1109/IECON.2011.6119614