Cost-effective single switch multi-channel LED driver

In this paper, we propose a cost-effective single switch multi-channel LED (light emitting diode) driver. While conventional LED drivers require as many non-isolated DC/DC converters as the number of LED channels, 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 simpler structure, with lower cost, and higher efficiency. In particular, because its power switch can be turned off under the zero current switching condition, it has very desirable advantages such as improved electromagnetic interference characteristics and high efficiency. Moreover, it uses only a small number of DC blocking capacitors with no additional active devices for current balancing of multi-channel LEDs, so the proposed driver exhibits high reliability and is cost effective. 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.

[1]  Shih-Chi Chang,et al.  The Future Development of Global LCD TV Industry , 2007, PICMET '07 - 2007 Portland International Conference on Management of Engineering & Technology.

[2]  Wu Yan,et al.  Research and analysis of the design development and perspective technology for LED lighting products , 2009, 2009 IEEE 10th International Conference on Computer-Aided Industrial Design & Conceptual Design.

[3]  G. Levin,et al.  A new secondary side post regulator (SSPR) PWM controller for multiple output power supplies , 1995, Proceedings of 1995 IEEE Applied Power Electronics Conference and Exposition - APEC'95.

[4]  Jee-Hoon Jung,et al.  Design Methodology for Transformers Including Integrated and Center-tapped Structures for LLC Resonant Converters , 2009 .

[5]  D.S. Zinger,et al.  Parallel connected LEDs operated at high to improve current sharing , 2004, Conference Record of the 2004 IEEE Industry Applications Conference, 2004. 39th IAS Annual Meeting..

[6]  Feng Tian,et al.  High Efficiency Parallel Post Regulator for Wide Range Input DC–DC Converter , 2008, IEEE Transactions on Power Electronics.

[7]  Robert W. Erickson,et al.  Fundamentals of Power Electronics , 2001 .

[8]  Heinz van der Broeck,et al.  Power driver topologies and control schemes for LEDs , 2007, APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition.

[9]  Regan Zane,et al.  Digital Architecture for Driving Large LED Arrays with Dynamic Bus Voltage Regulation and Phase Shifted PWM , 2007, APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition.