DocumentCode
1766267
Title
Self-adaptive load technology for multiplestring LED drivers
Author
Ning Ning ; Wen Bin Chen ; De Jun Yu ; Chun Yi Feng ; Cheng Bi Wang
Author_Institution
State Key Lab. of Electron. Thin Films & Integrated Devices, Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Volume
49
Issue
18
fYear
2013
fDate
August 29 2013
Firstpage
1170
Lastpage
1171
Abstract
A self-adaptive load technology for multiple-string LED drivers is presented. Directly operating from an AC voltage, the proposed technology realises soft switching with a self-adaptive load resistor, so that the LED avoids the current glitch during current switching. Thus, the quality of lighting, the lifetime and the performance of the LED are improved. An AC LED driver using the proposed technology was fabricated in a 0.25 μm BCDMOS process and tested with a five-string LED. The measured results show that the power factor is 0.998 (0.997) with 5.1% (7.2%) total harmonic distortion under 19 W 110 V/AC (220 V/AC) condition.
Keywords
driver circuits; harmonic distortion; light emitting diodes; AC voltage; BCDMOS process; current switching; multiple-string LED drivers; power 19 W; self-adaptive load resistor; self-adaptive load technology; size 0.25 mum; total harmonic distortion;
fLanguage
English
Journal_Title
Electronics Letters
Publisher
iet
ISSN
0013-5194
Type
jour
DOI
10.1049/el.2013.2093
Filename
6587662
Link To Document