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http://dx.doi.org/10.6109/jkiice.2014.18.9.2280

A Design and Implementation of Circuit for Efficient Power LED Dimming Control  

Kim, Doo-Hyun (Department of Computer Engineering, Chosun University)
Choi, Jae-Ho (Department of Computer Information, Songwon University)
Cho, Beom-Joon (Department of Computer Engineering, Chosun University)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.18, no.9, 2014 , pp. 2280-2288 More about this Journal
Abstract
The conventional dimming control methods of LED (Light-emitting dioades) include Analog, PWM (Pulse Width Modulation), and FM (Frequency Modulation) Control. Analog dimming is controlled by adjusting forward current of Power LED. Although Analog dimming is possible to control linearly the brightness levels on a whole range (0%~100%), it comes into existence a variation of wavelength by changing the Power LED's forward current. PWM dimming has achieved by varying in duty of full current flowing to the Power LED. Generally, PWM dimming doesn't make variation of wavelength but have difficulty with adjusting the linear brightness level between 0% and 10%. FM dimming method is on the same wavelength as PWM dimming, however, it has problem of flickering at low level of dimming. This paper propose a efficient dimming control method of Power LED in order to overcome the disadvantages of the above mentioned methods. We apply to Analog method in low level of dimming control and use PWM method in dimming range from 10% to 100%. For the experiment, we design and implement a circuit and test the proposed method. Consequently, we can control the linear brightness of Power LED across the whole range and get the constant wave at different dimming level. The experimental results show the benefits of the proposed method.
Keywords
Dimming Control Circuit; PWM; FM; Analog Control;
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1 A. Gulati. Modulation Techniques for LED Dimming. Cypress Application Note [Online]. AN49262, Document No. 001-49262 Rev. Oct. 2008. Available: http://www.cypress.com/
2 L. Svilainis, "LED PWM dimming linearity investigation," International Journal of Display, vol. 29, issue 3, pp. 243-249, July 2008.   DOI   ScienceOn
3 T. K. Kim, M. Rylander, E. J. Powers, W. M. Grady, and A. Arapostathis, "LED Lamp Flicker Caused by Interharmonics," in Proceeding of Instrumentation and Measurement Technology Conference, Victoria, BC, pp. 1920 - 1925, 2008.
4 A. Polydoros and C. L. Weber, "A Unified Approach to Serial Search Spread-Spectrum code acquisition--PART I: General Theory," IEEE Transaction on Communications, vol. 32, issue 5, pp. 542-549, May. 1984.   DOI
5 R. Rosen. DimmingTechniques for Switched-Mode LED Drivers. Power Designer-Texas Instrument [Online]. Literature Number: SNVA605, pp. 1-6, 2011. Available: http://www.ti.com/general/docs/lit/getliterature.tsp
6 M. Dyble, N. Narendran, A. Bierman, and T. Klein, "Impact of dimming white LEDs: chromaticity shifts due to different dimming methods," in Proceedings of the SPIE, vol. 5941, pp. 291-299, 2005.
7 S. H. Lee, "LED and DC power supply technology for LED lighting systems," The Korean Institute of Power Electronics, vol.14, no. 3, pp. 29-35, 2009.
8 X. Xu, X. Wu, M. Zhao, and X. Yan, "Design and implementation of a high dimming ratio LED drive controller," Journal of Semiconductors, vol. 30, no. 2, pp 025010-1-025010-6, Feb. 2009.   DOI
9 L. Svilainis, "Considerations of the Driving Electronics of LED Video Display Information Technology Interfaces," in Proceeding of the 29th International Conference on Information Technology Interfaces, pp. 431-436, 2007.
10 N. Prathyusha, D. S. Zinger, "An effective LED dimming approach," in Industry Applications Conference, vol. 3, pp. 1671-1676, 2004.