Buck–Boost–Buck-Type Single-Switch Multistring Resonant LED Driver With High Power Factor and Passive Current Balancing

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

14 Scopus Citations
View graph of relations

Author(s)

  • Xueshan Liu
  • Yuyang Wan
  • Zheng Dong
  • Mingzhi He
  • Qun Zhou

Detail(s)

Original languageEnglish
Article number8845669
Pages (from-to)5132-5143
Journal / PublicationIEEE Transactions on Power Electronics
Volume35
Issue number5
Online published19 Sep 2019
Publication statusPublished - May 2020
Externally publishedYes

Abstract

An integrated buck-boost-buck-type single-switch multistring resonant light-emitting diode (LED) driver is proposed and analyzed. It combines buck-boost and buck converters to achieve passive current balancing and power factor correction. With this circuit configuration, the proposed LED driver employs only one low-side connection active switch, resulting in a very simple control requirement involving one closed-loop controller for regulating one output current. Other output currents can be balanced automatically by resonant capacitor and storage capacitors, making the control strategy economical. In addition, high efficiency is achieved due to single-stage power conversion. Taking three-string LED driver as an example, the proposed buck-boost-buck-type single-switch LED driver is studied in terms of operating principle, current balancing principle, power factor (PF) analysis, voltage gain, and key circuit parameter design. Finally, an 84-W high-PF three-string LED driver prototype with 94.3% peak efficiency is built to verify the analytical results.

Research Area(s)

  • Buck-boost-buck, light-emitting diode (LED) driver, multistring, passive current balancing, power factor correction (PFC), single switch

Citation Format(s)

Buck–Boost–Buck-Type Single-Switch Multistring Resonant LED Driver With High Power Factor and Passive Current Balancing. / Liu, Xueshan; Wan, Yuyang; Dong, Zheng et al.

In: IEEE Transactions on Power Electronics, Vol. 35, No. 5, 8845669, 05.2020, p. 5132-5143.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review