AC-DC LED Driver with an Additional Active Rectifier and a Unidirectional Auxiliary Circuit for AC Power Ripple Isolation

Zhenyu Shan, Xiaomei Chen, Juri Jatskevich, Chi Kong Tse

Research output: Journal article publicationJournal articleAcademic researchpeer-review

18 Citations (Scopus)


Single-phase ac light-emitting diode (LED) lamps require long-lifespan and high-efficiency ac-dc power converters for power factor correction (PFC) and current regulation. In such converters, the inherent double-line-frequency ripple power from the ac source is isolated from the load by large electrolytic capacitors (E-caps) or E-cap-less active circuits to improve reliability and lifespan. This paper presents an ac-dc LED driver with an additional active rectifier and a unidirectional auxiliary circuit for ripple power isolation. As compared with other similar designs, the proposed LED driver operates with reduced redundant power processing and a lower voltage on the storage capacitor, and the additional active circuits include fewer power components. The prototype with small polymer-hybrid capacitors and ceramic capacitors is separately tested in the experiment.

Original languageEnglish
Article number8306898
Pages (from-to)685-699
Number of pages15
JournalIEEE Transactions on Power Electronics
Issue number1
Publication statusPublished - 1 Jan 2019


  • AC-DC converters
  • auxiliary circuit
  • LED driver
  • light-emitting diode (LED)
  • power factor correction (PFC)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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