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http://dx.doi.org/10.6113/TKPE.2016.21.4.320

Multi-channel Current Balancing Single Switch LED Driver for LED Backlight  

Hwang, Sang-Soo (School of Electrical Engineering, College of Electrical Engineering and Computer Science, Kookmin University)
Han, Sang-Kyoo (School of Electrical Engineering, College of Electrical Engineering and Computer Science, Kookmin University)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.21, no.4, 2016 , pp. 320-327 More about this Journal
Abstract
We propose a multi-channel current-balancing single switch light-emitting diode (LED) driver for a 3D TV. Conventional LED drivers require non-isolated DC/DC converters as many as the number of LED channels, whereas the proposed LED driver needs only one power switch and several balancing capacitors instead of expensive non-isolated DC/DC converters. Therefore, the proposed driver features a simple structure with low cost and high efficiency. In particular, because its power switch can be turned off under the zero-current switching condition, the proposed driver has desirable advantages, such as improved electromagnetic interference characteristics and high efficiency. Moreover, it only uses a small number of DC blocking capacitors with no additional active devices for the current balancing of multi-channel LEDs. Therefore, the proposed driver exhibits high reliability and cost effectiveness. To confirm the validity of the proposed driver, we perform a theoretical analysis and present design considerations and experimental results obtained from a prototype that is applicable to a 46" LED TV.
Keywords
Multi-channel LED driver; Current balancing;
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  • Reference
1 L. J. Hang, Y. L Gu., Z. Y. Lu., and Z. M. Qian., "Multi-output LLC resonant converter with symmetrical auxiliary output structure," in Proc. of IEEE INTELEC, pp. 1-5, Sep. 2006.
2 S. H. Lee, S. H. Cho, S. S. Hong, C. W. Roh, S. K. Han, H. B. Lee, and D. S. Oh, "A new current-balancing multi-channel LED driver using single transformer," 2010 Power Electronics Annual Conference, pp. 337-338, July 2010.
3 S. H. Lee, S. H. Cho, C. W. Roh, S. S. Hong, and S. K. Han, "A new current-balancing multi-channel LED driver for a larger screen LCD backlight driver for a large screen LCD backlight unit," Transactions of the Korea Institute of Power Electronics, Vol. 12, No. 2, pp. 111-118, Apr. 2010.
4 X. Wang, F. Tian., and I. Batarseh., "High efficiency parallel post regulator for wide range input dc-dc converter," IEEE Trans. on Power Electronics, Vol. 23, issue 2, pp. 852-858, Mar. 2008.   DOI
5 R. W. Erickson and D. Maksinmovic, Fundamentals of power electronics; 2nd edition, Kluwer Academic, pp. 705-721, 2001.
6 L. Y. Pan, S. C. Chang, M. Y. Liao, and Y. T Lin, " The future development of global LCD TV industry," in Proceeding of PICMET, pp. 1818-1821, Aug. 2007.