A High-Efficiency Single-Stage Isolated Sepic-Flyback AC–DC Led Driver

Gürçam K., Almalı M. N.

ELECTRONICS (Cleveland), vol.12, no.24, pp.1-20, 2023 (Peer-Reviewed Journal)

  • Publication Type: Article / Article
  • Volume: 12 Issue: 24
  • Publication Date: 2023
  • Doi Number: 10.3390/electronics12244946
  • Journal Name: ELECTRONICS (Cleveland)
  • Journal Indexes: Academic Search Premier, Applied Science & Technology Source, Computer & Applied Sciences
  • Page Numbers: pp.1-20
  • Van Yüzüncü Yıl University Affiliated: Yes


Regulating LED current and voltage is critical to maintaining a constant luminous flux in AC- or DC-powered LED lighting circuits. Today, users require constant current drivers that can provide a wide range of output voltages to drive different numbers of series-connected LED arrays. This work proposes an LED driver by combining an isolated SEPIC converter operating in the continuous conduction mode (CCM) and a modified Vienna rectifier. The proposed LED driver offers a single-switch control structure by adding a Vienna rectifier to the integrated SEPIC-FLYBACK converter. This driver structure provides many advantages over traditional bridge rectifier structures. The prototype circuit was tested in an 18 W continuous current mode (CCM) to verify its feasibility. As a result of the values obtained from both simulation and prototype circuit models, it has been shown to provide many of the following advantages: 95% high efficiency, high reliability, 4% low total harmonic distortion, 97% high power factor, and 70 V low switching voltage. This work meets class C 3-2 and IEC 61000 standards.