Sine-Reference Band (SRB)-Controlled Average Current Technique for Phase-Cut Dimmable AC-DC Buck LED Lighting Driver Without Electrolytic Capacitor
- Authors
- Shin, Changsik; Lee, Wonji; Lee, Se-Won; Lee, Sang-Han; Bang, Jun-Suk; Hong, Sung-Wan; Cho, Gyu-Hyeong
- Issue Date
- Aug-2018
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- AC-DC; buck LED driver; current regulation; dimming compatibility; electrolytic capacitor (E-Cap); phase-cut dimming control; power factor (PF); rectified sine-average (RSA) current control; visible flicker
- Citation
- IEEE TRANSACTIONS ON POWER ELECTRONICS, v.33, no.8, pp 6994 - 7009
- Pages
- 16
- Journal Title
- IEEE TRANSACTIONS ON POWER ELECTRONICS
- Volume
- 33
- Number
- 8
- Start Page
- 6994
- End Page
- 7009
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/4401
- DOI
- 10.1109/TPEL.2017.2758167
- ISSN
- 0885-8993
1941-0107
- Abstract
- This paper presents a phase-cut dimmable ac-dc buck LED driver for electrolytic capacitor-less LED lighting applications. In the driver, the sine-reference band (SRB)-controlled average current technique is proposed to perform rectified sine-average current control and phase-cut dimming control. The rectified sine-average current control can regulate the average value of sine-wave LED current, maintaining a high power factor (PF) over a wide range of ac input voltage and output LED load. The phase-cut dimming control not only makes the LED driver compatible with two types of phase-cut dimmers, namely, leading-edge and trailing-edge dimming types, but also eliminates visible dimming flicker at the ac line frequency. Fabricated in a 0.35 mu m CMOS process, experimental results show the line regulation of +/- 2.36% over 90 to 260 VAC and the load regulation of +/- 0.65% within the load range of 10 to 36 LEDs. The PF exceeds 0.95 under all conditions, and the peak efficiency of 90.7% is achieved. The analysis of the flicker frequency verifies that the proposed dimmable LED driver completely eliminates visible flicker owing to the phase dimming variations without an output electrolytic capacitor.
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