Single-Stage LED Driver Achieves Electrolytic Capacitor-Less and Flicker-Free Operation with Unidirectional Current Compensator

Peng Fang, Samuel Webb, Yan Fei Liu, Paresh C. Sen

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

AC-connected light emitting diode (LED) drivers experience imbalanced energy between input and output in a half-line cycle. To achieve the flicker-free operation, the imbalanced energy needs to be buffered, often by energy-dense electrolytic capacitors. However, electrolytic capacitors are also well-known for their short lifespan. These capacitors are the limiting factor of an LED drivers' lifespan. High voltage film capacitors and a buck converter have been used in the proposed LED driver to buffer the imbalanced energy. When P in > P LED , the extra energy is transferred from the ac input directly to the high voltage film capacitors. When P in < P LED , the energy is transferred from the high voltage film capacitors to the output by the buck converter. The imbalanced energy goes through two power conversion steps in the proposed LED driver, which is one time less than other comparable electrolytic capacitor-less designs, enabling a higher efficiency to be achieved. A 28 W flyback topology based experimental prototype had been built and tested to verify the proposed design.

Original languageEnglish (US)
Article number8486664
Pages (from-to)6760-6776
Number of pages17
JournalIEEE Transactions on Power Electronics
Volume34
Issue number7
DOIs
StatePublished - Jul 1 2019
Externally publishedYes

Fingerprint

Electrolytic capacitors
Light emitting diodes
Electric potential
Capacitors
Topology
Film capacitor

Keywords

  • AC-connected light emitting diode (LED) driver
  • electrolytic capacitor-less
  • energy buffering
  • flicker-free operation
  • high power factor

Cite this

Single-Stage LED Driver Achieves Electrolytic Capacitor-Less and Flicker-Free Operation with Unidirectional Current Compensator. / Fang, Peng; Webb, Samuel; Liu, Yan Fei; Sen, Paresh C.

In: IEEE Transactions on Power Electronics, Vol. 34, No. 7, 8486664, 01.07.2019, p. 6760-6776.

Research output: Contribution to journalArticle

@article{85c6e727d91c4a4993b334b95ae4b155,
title = "Single-Stage LED Driver Achieves Electrolytic Capacitor-Less and Flicker-Free Operation with Unidirectional Current Compensator",
abstract = "AC-connected light emitting diode (LED) drivers experience imbalanced energy between input and output in a half-line cycle. To achieve the flicker-free operation, the imbalanced energy needs to be buffered, often by energy-dense electrolytic capacitors. However, electrolytic capacitors are also well-known for their short lifespan. These capacitors are the limiting factor of an LED drivers' lifespan. High voltage film capacitors and a buck converter have been used in the proposed LED driver to buffer the imbalanced energy. When P in > P LED , the extra energy is transferred from the ac input directly to the high voltage film capacitors. When P in < P LED , the energy is transferred from the high voltage film capacitors to the output by the buck converter. The imbalanced energy goes through two power conversion steps in the proposed LED driver, which is one time less than other comparable electrolytic capacitor-less designs, enabling a higher efficiency to be achieved. A 28 W flyback topology based experimental prototype had been built and tested to verify the proposed design.",
keywords = "AC-connected light emitting diode (LED) driver, electrolytic capacitor-less, energy buffering, flicker-free operation, high power factor",
author = "Peng Fang and Samuel Webb and Liu, {Yan Fei} and Sen, {Paresh C.}",
year = "2019",
month = "7",
day = "1",
doi = "10.1109/TPEL.2018.2874999",
language = "English (US)",
volume = "34",
pages = "6760--6776",
journal = "IEEE Transactions on Power Electronics",
issn = "0885-8993",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "7",

}

TY - JOUR

T1 - Single-Stage LED Driver Achieves Electrolytic Capacitor-Less and Flicker-Free Operation with Unidirectional Current Compensator

AU - Fang, Peng

AU - Webb, Samuel

AU - Liu, Yan Fei

AU - Sen, Paresh C.

PY - 2019/7/1

Y1 - 2019/7/1

N2 - AC-connected light emitting diode (LED) drivers experience imbalanced energy between input and output in a half-line cycle. To achieve the flicker-free operation, the imbalanced energy needs to be buffered, often by energy-dense electrolytic capacitors. However, electrolytic capacitors are also well-known for their short lifespan. These capacitors are the limiting factor of an LED drivers' lifespan. High voltage film capacitors and a buck converter have been used in the proposed LED driver to buffer the imbalanced energy. When P in > P LED , the extra energy is transferred from the ac input directly to the high voltage film capacitors. When P in < P LED , the energy is transferred from the high voltage film capacitors to the output by the buck converter. The imbalanced energy goes through two power conversion steps in the proposed LED driver, which is one time less than other comparable electrolytic capacitor-less designs, enabling a higher efficiency to be achieved. A 28 W flyback topology based experimental prototype had been built and tested to verify the proposed design.

AB - AC-connected light emitting diode (LED) drivers experience imbalanced energy between input and output in a half-line cycle. To achieve the flicker-free operation, the imbalanced energy needs to be buffered, often by energy-dense electrolytic capacitors. However, electrolytic capacitors are also well-known for their short lifespan. These capacitors are the limiting factor of an LED drivers' lifespan. High voltage film capacitors and a buck converter have been used in the proposed LED driver to buffer the imbalanced energy. When P in > P LED , the extra energy is transferred from the ac input directly to the high voltage film capacitors. When P in < P LED , the energy is transferred from the high voltage film capacitors to the output by the buck converter. The imbalanced energy goes through two power conversion steps in the proposed LED driver, which is one time less than other comparable electrolytic capacitor-less designs, enabling a higher efficiency to be achieved. A 28 W flyback topology based experimental prototype had been built and tested to verify the proposed design.

KW - AC-connected light emitting diode (LED) driver

KW - electrolytic capacitor-less

KW - energy buffering

KW - flicker-free operation

KW - high power factor

UR - http://www.scopus.com/inward/record.url?scp=85054631003&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85054631003&partnerID=8YFLogxK

U2 - 10.1109/TPEL.2018.2874999

DO - 10.1109/TPEL.2018.2874999

M3 - Article

VL - 34

SP - 6760

EP - 6776

JO - IEEE Transactions on Power Electronics

JF - IEEE Transactions on Power Electronics

SN - 0885-8993

IS - 7

M1 - 8486664

ER -