Analysis of supply parameters of single- and double-string LED lamps with integrated AC direct capacitorless drivers

Thanks to a very high luminous efficacy of LED lamps (over 160 lm/W) they are the most preferred light sources in lighting applications today. The useful lifetime of LED modules exceeds 50,000 hours. Chromatic parameters of lamps making use of SSL (Solid State Lighting) have already equalled classic...

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Bibliographic Details
Published inBulletin of the Polish Academy of Sciences. Technical sciences Vol. 68; no. 4; pp. 819 - 827
Main Authors Chęciński, J., Filus, Z.
Format Journal Article
LanguagePolish
English
Published Warsaw Polish Academy of Sciences 01.08.2020
Subjects
Capacitors
Conformity
Converters
Design optimization
Efficiency
Electrical engineering
Electrolytic capacitors
Flicker
Lamps
led
led ac direct driver
led-cob
Light emitting diodes
Light sources
Lighting
Luminous efficacy
Modules
Parameters
Power
Power factor
pwm
sm2082
ssl
Strings
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Summary:Thanks to a very high luminous efficacy of LED lamps (over 160 lm/W) they are the most preferred light sources in lighting applications today. The useful lifetime of LED modules exceeds 50,000 hours. Chromatic parameters of lamps making use of SSL (Solid State Lighting) have already equalled classic solutions, although they were noticeably worse not so long ago. High values of the Colour Rendering Index (CRI) and ease of control over the luminous flux cause that lamps with LEDs have become very attractive solutions. Today, the most important problem concerns LED drivers supplied from the 230 VAC mains. The lifetime of switched-mode converters, including electrolytic capacitors, is considerably shorter than that of LEDs. This paper discusses the features of alternative drivers for LED modules which are supplied directly from the 230 VAC mains and do not contain any electrolytic capacitors. In particular, power factor and efficiency of lamps with one or two LED strings are analysed and some hints concerning optimal design of such lamps are given. A unique feature of this work is a detailed analysis of harmonics contents in the supply current of such drivers, proving their conformity with the relevant standard. Finally, some problems associated with flicker resulting from the considered type of supply are mentioned.
ISSN:2300-1917
0239-7528
2300-1917
DOI:10.24425/bpasts.2020.134188