Design and Experimental Verification of 400-W Class LED Driver with Cooperative Control Method for Two-Parallel Connected DC/DC Converters

Tomoharu Yada, Yuta Katamoto, Hiroaki Yamada, Toshihiko Tanaka, Masayuki Okamoto and Tsuyoshi Hanamoto
Additional contact information
Tomoharu Yada: New Japan Radio Co., Ltd., 3-10, Nihonbashi Yokoyama-cho, Chuo-ku, Tokyo 103-8456, Japan
Yuta Katamoto: Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 2-16-1, Tokiwadai, Ube city, Yamaguchi 755-8611, Japan
Hiroaki Yamada: Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 2-16-1, Tokiwadai, Ube city, Yamaguchi 755-8611, Japan
Toshihiko Tanaka: Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 2-16-1, Tokiwadai, Ube city, Yamaguchi 755-8611, Japan
Masayuki Okamoto: Department of Electrical Engineering, National Institute of Technology, Ube College, 2-14-1, Tokiwadai, Ube city, Yamaguchi 755-8555, Japan
Tsuyoshi Hanamoto: Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4, Hibikino, Wakamatsu, Kitakyushu city, Fukuoka 808-0196, Japan

Energies, 2018, vol. 11, issue 9, 1-20

Abstract: This paper deals with a design and experimental verification of 400-W class light-emitting diode (LED) driver with cooperative control method for two-parallel connected DC/DC converters. In the cooperative control method, one DC/DC converter is selected to supply the output current for the LED, based on the reference value of the LED current. Thus, the proposed cooperative-control strategy achieves wide dimming range operation. The discontinuous current conduction mode (DCM) operation improves the total harmonic distortion (THD) value on the AC side of the LED driver. The standard of Electrical Applications and Materials Safety Act in Japan has defined the flicker frequency and minimum optical output. The smoothing capacitors are designed by considering the power flow and LED current ripple for satisfying the standard. A prototype LED driver is constructed and tested. Experimental results demonstrate that a wide dimming operation range from 1 to 100% is achieved with a THD value less than 10% on the AC side, by the proposed control strategy. The authors compare the power conversion efficiency between Si- and SiC-metal-oxide-semiconductor field-effect transistors (MOSFETs) based LED driver. The maximum power conversion efficiency by using SiC-MOSFETs based LED driver is 91.4%. Finally, the variable switching frequency method is proposed for improving the power conversion efficiency for a low LED current region.

Keywords: LED driver; wide dimming operation; single-stage; parallel-connected DC/DC converter topology; cooperative control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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