Parallel Energy Buffering LED Driver Achieves Electrolytic Capacitor-Less and Flicker-Free Operation

Peng Fang, Bo Sheng, Wen Bo Liu, Yan Fei Liu, Paresh C. Sen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

AC powered LED drivers experience imbalanced energy, between input and output, in a half line cycle. To achieve flicker-free operation, the imbalanced energy needs to be buffered, and often by energy-dense electrolytic capacitors. However, electrolytic capacitors are also well-known for short lifespan and the limiting factor of LED drivers' life. High voltage film capacitors and Buck converter had been used in the proposed LED driver to buffer imbalanced energy. When \mathbf{P}-{\mathbf{in}} > \mathbf{P}-{\mathbf{LED}}, the extra energy is transferred from AC input directly to the high voltage film capacitors. When P in < PLED, the shortage energy is transferred from the high voltage film capacitors to the output by the Buck converter. The imbalanced energy goes through two times power conversion in the proposed LED driver, which is one time less than other comparable electrolytic capacitor-less designs. Therefore, an improved efficiency can be achieved. A 28W Flyback topology based experimental prototype had been built and tested to verify the proposed design.

Original languageEnglish (US)
Title of host publication2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages5117-5124
Number of pages8
ISBN (Electronic)9781479973118
DOIs
StatePublished - Dec 3 2018
Externally publishedYes
Event10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018 - Portland, United States
Duration: Sep 23 2018Sep 27 2018

Publication series

Name2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018

Other

Other10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018
Country/TerritoryUnited States
CityPortland
Period9/23/189/27/18

Keywords

  • Electrolytic capacitor-less
  • Energy buffering
  • Energy imbalance
  • Flicker-free LED driving

Fingerprint

Dive into the research topics of 'Parallel Energy Buffering LED Driver Achieves Electrolytic Capacitor-Less and Flicker-Free Operation'. Together they form a unique fingerprint.

Cite this