Sine-Reference Band (SRB)-Controlled Average Current Technique for Phase-Cut Dimmable AC-DC Buck LED Lighting Driver without Electrolytic Capacitor

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 μm 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.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2018-08
Language
English
Article Type
Article
Keywords

HIGH-POWER-FACTOR; CURRENT-ACCURACY; CONDUCTION MODE; PFC CONVERTER; LAMPS; PEAK

Citation

IEEE TRANSACTIONS ON POWER ELECTRONICS, v.33, no.8, pp.6994 - 7009

ISSN
0885-8993
DOI
10.1109/TPEL.2017.2758167
URI
http://hdl.handle.net/10203/242322
Appears in Collection
EE-Journal Papers(저널논문)
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