A flexible mode electrolytic capacitor-free LED driver with high efficiency over a wide range of input voltage

Jun Zeng, Feng Liu, Junfeng Liu, K. W.Eric Cheng

Research output: Journal article publicationJournal articleAcademic researchpeer-review

4 Citations (Scopus)


The conventional ac-dc LED drivers fail to achieve high efficiency and optimized bus voltage over a wide range of input voltage. In order to obtain the better performance in high-line and low-line conditions simultaneously, a flexible mode LED driver is proposed. The proposed driver can operate in half-voltage input mode at high-line input to achieve relatively low-bus voltage and high efficiency. Meanwhile, the proposed driver can operate in full-voltage input mode at low-line input to cut down the diode loss and switch loss; thus, high efficiency can be also achieved. Meanwhile, zero-voltage switching characteristic of the active switches can be fulfilled in both modes. In addition, the proposed LED driver can achieve electrolytic capacitor free. The detail structure, operational principle, and design considerations are examined in detail. Finally, the feasibility and the effectiveness of the proposed LED driver are verified by an experimental prototype with rated power of 100 W.

Original languageEnglish
Article number8944151
Pages (from-to)8490-8500
Number of pages11
JournalIEEE Transactions on Power Electronics
Issue number8
Publication statusPublished - Aug 2020


  • Electrolytic capacitor free
  • flexible mode
  • high efficiency
  • LED driver
  • optimized bus voltage
  • wide range of input voltage

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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