LED Driver Achieves Electrolytic Capacitor-Less and Flicker-Free Operation with an Energy Buffer Unit

Peng Fang, Bo Sheng, Samuel Webb, Yan Zhang, Yan Fei Liu

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Electrolytic capacitors are often needed to provide the high-density energy storage required by ac-powered LED drivers; however, they are also well known for their short lifespans. Eliminating electrolytic capacitors in ac-dc LED driver design has become a very important target to improve LED driver technology. In this paper, a cycle-by-cycle energy buffering LED driver has been proposed to achieve electrolytic capacitor-less flicker-free operation. An energy buffering unit, with high-voltage film capacitors being the energy storage device, is introduced in the design to buffer the imbalanced energy in every switching cycle. The switching current can be controlled to meet high power factor correction requirement, while maintaining dc LED output current at the same time. Compared to previous electrolytic capacitor-less designs, this technology can reduce circulating power and, therefore, power conversion loss. A 15-W experimental prototype had been built and tested to verify the proposed LED driving method.

Original languageEnglish (US)
Article number8493279
Pages (from-to)6777-6793
Number of pages17
JournalIEEE Transactions on Power Electronics
Volume34
Issue number7
DOIs
StatePublished - Jul 1 2019
Externally publishedYes

Fingerprint

Electrolytic capacitors
Light emitting diodes
Energy storage
Electric potential

Keywords

  • Cycle-by-cycle energy buffering
  • Electrolytic capacitor-less design
  • Flicker-free operation
  • LED driver

Cite this

LED Driver Achieves Electrolytic Capacitor-Less and Flicker-Free Operation with an Energy Buffer Unit. / Fang, Peng; Sheng, Bo; Webb, Samuel; Zhang, Yan; Liu, Yan Fei.

In: IEEE Transactions on Power Electronics, Vol. 34, No. 7, 8493279, 01.07.2019, p. 6777-6793.

Research output: Contribution to journalArticle

Fang, Peng ; Sheng, Bo ; Webb, Samuel ; Zhang, Yan ; Liu, Yan Fei. / LED Driver Achieves Electrolytic Capacitor-Less and Flicker-Free Operation with an Energy Buffer Unit. In: IEEE Transactions on Power Electronics. 2019 ; Vol. 34, No. 7. pp. 6777-6793.
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