A Flicker-Free Single-Stage Offline LED Driver With High Power Factor

Peng Fang, Yan Fei Liu, Paresh C. Sen

Research output: Contribution to journalArticlepeer-review

79 Scopus citations


A conventional offline single-stage light-emitting diode (LED) driver with a high power factor usually produces a significant twice-line-frequency ripple LED current, where the ripple LED current is presented as flickering to human eye. This paper introduces a ripple cancellation method to remove the twice-line-frequency voltage ripple for an offline single-stage LED driver with a power factor correction. Consequently, a dc LED current can be produced to achieve flicker-free LED driving performance. At the same time, the required storage capacitor for the proposed LED driver can be greatly reduced, and the circuit implementation to achieve ripple cancellation is simple. Thus, the overall cost of the proposed LED driver is low. The proposed LED driver also features high efficiency because of its power structure. A 35-W Flyback experimental prototype and a 10-W Buck-Boost experimental prototype have been built to validate the proposed design and demonstrate its optimal performance.

Original languageEnglish (US)
Article number7111222
Pages (from-to)654-665
Number of pages12
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
Issue number3
StatePublished - Sep 30 2015
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2013 IEEE.


  • flicker-free LED driving
  • high power factor
  • ripple cancellation
  • single stage power conversion


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