The effect of capacitance on drive current of general lighting LED luminaires

A. N. Padmasali, J. E. Noronha, S. G. Kini

Research output: Contribution to journalArticle

Abstract

The reliability of a LED luminaire depends on the reliability of each of its subsystems. Experience suggests that, of these subsystems, it is the LED driver that tends to fail earliest. Any LED driver has an electrolytic capacitor to limit the ripple current, which helps the luminaire to function appropriately. This paper describes the effects on ripple current of changes in the capacitance and thus on LED luminaire performance. A capacitor bank is developed containing electrolytic capacitor combinations to obtain 27 capacitance values in the range 0.017 to 1570 µF. Two commercially available LED downlighter luminaires of the same model and manufacturer were used for this study. The ripple current and lumen output values are observed after connecting each capacitance from the bank, and the percentage flicker is calculated. LED light output shows visible flicker for low capacitances up to 0.1 µF with percentage flicker above 100%, while percentage flicker for capacitors up to 100 µF is more than 50%. For capacitance values of 220 µF and more, the percentage flicker is less than 50%. For the LED driver the capacitor decides the amount of ripple in the output current, so this work helps in formulating metrics for determining the service life of LED luminaires.

Original languageEnglish
JournalLighting Research and Technology
DOIs
Publication statusAccepted/In press - 01-01-2017

Fingerprint

Lighting fixtures
Light emitting diodes
Capacitance
Lighting
Electrolytic capacitors
Capacitors
Service life

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Cite this

@article{dbea20a98797418383431379da7564ce,
title = "The effect of capacitance on drive current of general lighting LED luminaires",
abstract = "The reliability of a LED luminaire depends on the reliability of each of its subsystems. Experience suggests that, of these subsystems, it is the LED driver that tends to fail earliest. Any LED driver has an electrolytic capacitor to limit the ripple current, which helps the luminaire to function appropriately. This paper describes the effects on ripple current of changes in the capacitance and thus on LED luminaire performance. A capacitor bank is developed containing electrolytic capacitor combinations to obtain 27 capacitance values in the range 0.017 to 1570 µF. Two commercially available LED downlighter luminaires of the same model and manufacturer were used for this study. The ripple current and lumen output values are observed after connecting each capacitance from the bank, and the percentage flicker is calculated. LED light output shows visible flicker for low capacitances up to 0.1 µF with percentage flicker above 100{\%}, while percentage flicker for capacitors up to 100 µF is more than 50{\%}. For capacitance values of 220 µF and more, the percentage flicker is less than 50{\%}. For the LED driver the capacitor decides the amount of ripple in the output current, so this work helps in formulating metrics for determining the service life of LED luminaires.",
author = "Padmasali, {A. N.} and Noronha, {J. E.} and Kini, {S. G.}",
year = "2017",
month = "1",
day = "1",
doi = "10.1177/1477153517732811",
language = "English",
journal = "Lighting Research and Technology",
issn = "1477-1535",
publisher = "SAGE Publications Ltd",

}

The effect of capacitance on drive current of general lighting LED luminaires. / Padmasali, A. N.; Noronha, J. E.; Kini, S. G.

In: Lighting Research and Technology, 01.01.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The effect of capacitance on drive current of general lighting LED luminaires

AU - Padmasali, A. N.

AU - Noronha, J. E.

AU - Kini, S. G.

PY - 2017/1/1

Y1 - 2017/1/1

N2 - The reliability of a LED luminaire depends on the reliability of each of its subsystems. Experience suggests that, of these subsystems, it is the LED driver that tends to fail earliest. Any LED driver has an electrolytic capacitor to limit the ripple current, which helps the luminaire to function appropriately. This paper describes the effects on ripple current of changes in the capacitance and thus on LED luminaire performance. A capacitor bank is developed containing electrolytic capacitor combinations to obtain 27 capacitance values in the range 0.017 to 1570 µF. Two commercially available LED downlighter luminaires of the same model and manufacturer were used for this study. The ripple current and lumen output values are observed after connecting each capacitance from the bank, and the percentage flicker is calculated. LED light output shows visible flicker for low capacitances up to 0.1 µF with percentage flicker above 100%, while percentage flicker for capacitors up to 100 µF is more than 50%. For capacitance values of 220 µF and more, the percentage flicker is less than 50%. For the LED driver the capacitor decides the amount of ripple in the output current, so this work helps in formulating metrics for determining the service life of LED luminaires.

AB - The reliability of a LED luminaire depends on the reliability of each of its subsystems. Experience suggests that, of these subsystems, it is the LED driver that tends to fail earliest. Any LED driver has an electrolytic capacitor to limit the ripple current, which helps the luminaire to function appropriately. This paper describes the effects on ripple current of changes in the capacitance and thus on LED luminaire performance. A capacitor bank is developed containing electrolytic capacitor combinations to obtain 27 capacitance values in the range 0.017 to 1570 µF. Two commercially available LED downlighter luminaires of the same model and manufacturer were used for this study. The ripple current and lumen output values are observed after connecting each capacitance from the bank, and the percentage flicker is calculated. LED light output shows visible flicker for low capacitances up to 0.1 µF with percentage flicker above 100%, while percentage flicker for capacitors up to 100 µF is more than 50%. For capacitance values of 220 µF and more, the percentage flicker is less than 50%. For the LED driver the capacitor decides the amount of ripple in the output current, so this work helps in formulating metrics for determining the service life of LED luminaires.

UR - http://www.scopus.com/inward/record.url?scp=85042521757&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85042521757&partnerID=8YFLogxK

U2 - 10.1177/1477153517732811

DO - 10.1177/1477153517732811

M3 - Article

AN - SCOPUS:85042521757

JO - Lighting Research and Technology

JF - Lighting Research and Technology

SN - 1477-1535

ER -