AC direct multiple-string LED driver with low THD and minimum components

Yutsung Yeh, Minjie Chen, Xutao Li, Hirofumi Shinohara, Tsutomu Yoshihara

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

5 Citations (Scopus)


A multiple-string LED driver with low total harmonic distortion (THD) by sinusoid-like reference and minimum components is presented in this paper. The proposed commutating method is able to control the source-coupled-pair by simplest circuitry and without passive components. The reference voltage is divided from rectifier in order to minimize the THD. The simulated 4-strings LED driver is able to achieve high power factor 99.95% and very low THD 3.16% under a 10W/100V AC condition. And the proposed circuit is implemented by differential pair and diodes to replace op-amp and bias voltage.

Original languageEnglish
Title of host publicationISOCC 2015 - International SoC Design Conference
Subtitle of host publicationSoC for Internet of Everything (IoE)
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages2
ISBN (Electronic)9781467393089
Publication statusPublished - 2016 Feb 8
Event12th International SoC Design Conference, ISOCC 2015 - Gyeongju, Korea, Republic of
Duration: 2015 Nov 22015 Nov 5

Publication series

NameISOCC 2015 - International SoC Design Conference: SoC for Internet of Everything (IoE)


Other12th International SoC Design Conference, ISOCC 2015
Country/TerritoryKorea, Republic of


  • commutation
  • low THD
  • multiple-string
  • source-coupled-pair

ASJC Scopus subject areas

  • Hardware and Architecture
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials


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