NDLI: A 110-V AC, 17.1-W multi-segmented LED driver with 96.2% power factor

Content Provider	IEEE Xplore Digital Library
Author	Taehoon Jeong Jaeha Kim
Copyright Year	2015
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Inter-Univ. Semicond. Res. Center, Seoul, South Korea (Taehoon Jeong; Jaeha Kim)
Abstract	This paper presents an AC-powered, boostconverter LED driver that can be implemented with lowinductance inductor and low-voltage capacitors to reduce component costs. The proposed LED driver achieves this by segmenting the LED string into multiple sections and varying the number of LED sections connected in series and then to the charging inductor depending on the input AC voltage level, in a novel fashion to regulate the total current level as well as balancing the individual LED current levels. The switching schedule of the LED sections and pulse-widths are preprogrammed into a look-up table, which is played when it is triggered by an input's zero-crossing event. A digital feedback loop compensates the pulse-width schedule with an offset to address the parameter uncertainties and maintain high power factor levels. A prototype LED driver demonstrates 96.2% power factor and 86.1% power efficiency while delivering 17.1-W to three sections of high-brightness white LEDs and reducing the capacitor voltage stress by 66.7%.
Starting Page	896
Ending Page	899
File Size	975352
Page Count	4
File Format	PDF
ISBN	9781479967353
DOI	10.1109/APEC.2015.7104455
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-03-15
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Light emitting diodes Switches Inductors Reactive power Capacitors Prototypes
Content Type	Text
Resource Type	Article

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