A Comparative Study of Efficient Offline Single-Stage AC-DC LED Lighting Drivers Across Various Output Ranges

Kunhee Cho

doi:10.23075/jicas.2024.10.1.004

Kunhee Cho Kyungpook National University

DOI: https://doi.org/10.23075/jicas.2024.10.1.004

Keywords: Averaged switch model, AC-DC converter, LED driver, peak current control

Abstract

A comparative study is presented on the efficiency of an offline single-stage AC-DC LED driver for various LED strings. To ensure a fair comparison among different types of power converters, averaged switch models of non-isolated LED drivers, based on peak current control, are employed for buck, buck-boost, and boost converters. The averaged switch model allows for easy determination of performance metrics, such as power factor (PF), total harmonic distortion (THD), and output power (POUT). Additionally, it provides a fair means of comparing performance by altering the number of LED strings used with different types of power converters. In this paper, the power boundary of LED strings for each type of power converter is clearly defined, given a constant AC input voltage.

Author Biography

Kunhee Cho, Kyungpook National University

Kunhee Cho received the B.S. and M.S. degrees in electrical and electronic engineering from Yonsei University, Seoul, South Korea, in 2007 and 2009, respectively, and the Ph.D. degree in electrical and computer engineering from the University of Texas at Austin, Austin, TX, USA, in 2016. From 2009 to 2012, he was with the Fairchild Semiconductor,

Bucheon, South Korea, where he designed power management integrated circuits (ICs). In 2015 and 2016, he was a Graduate Research Intern with the Texas Instruments Incorporated, Dallas, TX, USA, in the low-power RF team. From 2017 to 2019, he was with Qualcomm Technologies Incorporated, Santa Clara, CA, USA, where he designed power management ICs for battery charger systems. He is currently an Assistant Professor at the School of Electronics Engineering, Kyungpook National University, Daegu, South Korea. His research interests include power management ICs, gate drivers, class-D amplifiers, and RF power amplifiers. Dr. Cho was a recipient of the Texas Instruments Outstanding Student Design Award in 2013.

Homepage: https://sites.google.com/view/icslab/