Analysis, design, and experimentation of the active hybrid‐series‐parallel PWM dimming scheme for high‐efficient off‐line LED drivers

  1. Abdelmessih, Guirguis Z. 2
  2. Alonso, José Marcos 2
  3. Dalla Costa, Marco A. 1
  1. 1 Federal University of Santa MariaGroup of Intelligence in Lighting (GEDRE)Santa MariaBrazil
  2. 2 Electrical Engineering DepartmentUniversity of OviedoCampus de ViesquesGijonSpain
IET Power Electronics

ISSN: 1755-4543

Year of publication: 2019

Volume: 12

Issue: 7

Pages: 1697-1705

Type: Article

DOI: 10.1049/IET-PEL.2018.6142 GOOGLE SCHOLAR

More publications in: IET Power Electronics


Cited by

  • Scopus Cited by: 9 (19-09-2023)
  • Web of Science Cited by: 7 (15-09-2023)
  • Dimensions Cited by: 9 (15-03-2023)

JCR (Journal Impact Factor)

  • Year 2019
  • Journal Impact Factor: 2.672
  • Journal Impact Factor without self cites: 2.0
  • Article influence score: 0.628
  • Best Quartile: Q2
  • Area: ENGINEERING, ELECTRICAL & ELECTRONIC Quartile: Q2 Rank in area: 113/266 (Ranking edition: SCIE)

SCImago Journal Rank

  • Year 2019
  • SJR Journal Impact: 0.998
  • Best Quartile: Q1
  • Area: Electrical and Electronic Engineering Quartile: Q1 Rank in area: 132/1832

Scopus CiteScore

  • Year 2019
  • CiteScore of the Journal : 5.5
  • Area: Electrical and Electronic Engineering Percentile: 81

Journal Citation Indicator (JCI)

  • Year 2019
  • Journal Citation Indicator (JCI): 0.9
  • Best Quartile: Q2
  • Area: ENGINEERING, ELECTRICAL & ELECTRONIC Quartile: Q2 Rank in area: 101/318


(Data updated as of 15-03-2023)
  • Total citations: 9
  • Recent citations: 4
  • Field Citation Ratio (FCR): 3.1


This study presents a high power factor (PF) light-emitting diode (LED) driver featuring a pulse width modulation (PWM) dimming technique. The integrated buck-flyback-buck converter (IBFBC) is built by connecting a buck converter to the integrated buck-flyback converter's output. The IBFBC ensures a constant output current regulation as well as high PF at all dimming ratios. The purpose of the output buck converter is to clear up the discontinuous power operation created by the PWM dimming. This occurs when the buck converter absorbs the output power, at LED switched-off, and sends it back to the input. Thus, the IBFBC maintains the operational enhancement shown by the hybrid-series-parallel (HSP)-PWM technique, ensuring greater efficiency. This study explains the operating principles of the IBFBC using circuit diagrams as well as an average model for the entire converter. Moreover, the study presents a mathematical analysis of the IBFBC power flow. It provides guidance on how to select the optimum value for the output buck inductance. A 230V, 50Hz input, 160V output, 100W AC–DC converter operating at 100 kHz has been implemented. The prototype is fully tested to demonstrate the active HSP-PWM technique. An efficiency ranging 50–86% corresponding to the dimming ratio of 5–100% is reached, where 5% dimming refers to an output power of 4W.