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Design of Adaptive Current Control Circuits for LEDs

LED 정전류 적응 제어 회로 설계

  • Received : 2015.08.27
  • Accepted : 2015.11.09
  • Published : 2015.12.31

Abstract

An effective way to ensure that LEDs produce wanted light output is to use a current driving topology, because the brightness of LEDs is directly related to their current. However, this topology may lead to the lifetime shortening of a illumination system because over-currents may flow through non-damaged LEDs in case some LEDs are damaged. This paper presents an adaptive current control circuits for LEDs, which protect LEDs in a good state by limiting the driving currents according to the number of damaged ones. The proposed control circuits consist of a simple constant-current driver and a micro-controller which monitors the voltage of LED array without any auxiliary current sensors for fault diagnosis. And the driving current is automatically controlled into 6-levels according to the number of failures.

Keywords

LED Drive;Linear Current Regulator;Over-Current Protection;Failure Detection of LED

References

  1. S. J. Choi, K. C. Lee, and B. H. Cho, "Design of fluorescent lamp ballast with PFC using a power piezoelectric transformer," IEEE Trans. Ind. Electron., vol. 52, no. 6, pp. 1573-1581, Dec. 2005. https://doi.org/10.1109/TIE.2005.858726
  2. C. H. Lin, "Digital-dimming controller with current spikes elimination technique for LCD backlight electronic ballast," IEEE Trans. Ind. Electron., vol. 53, no. 6, pp. 1881-1888, Dec. 2006. https://doi.org/10.1109/TIE.2006.885143
  3. C. Y. Wu, T. F. Wu, J. R. Tsai, Y. M. Chen, and C. C. Chen, "Multistring LED backlight driving system for LCD panels with color sequential display and area control," IEEE Trans. Ind. Electron., vol. 55, no. 10, pp. 3791-3800, Oct. 2008. https://doi.org/10.1109/TIE.2008.921206
  4. Min-Woo Jung, Seong Woo Kwak, Chang-dong Kim, In-Soo Nam, Sang-Hyun Park, "Development of a Digital Controller for LED Lighting System with Adjustable Illuminance and Chromaticity." Proceeding of KIIS Spring Conference 2013, vol. 23, no. 1, pp. 223-224.
  5. Kim, Eung-Seok, and Young-Tae Kim. "A Study on the Mathematical Modeling and Constant Current Adaptive Controller Design for Power LEDs." Journal of the Korean Institute of Illuminating and Electrical Installation Engineers 25.9 (2011): 8-13.
  6. Chiu, Huang-Jen, et al. "A high-efficiency dimmable LED driver for low-power lighting applications." Industrial Electronics, IEEE Transactions on 57.2 (2010): 735-743. https://doi.org/10.1109/TIE.2009.2027251
  7. Hu, Yuequan, and Milan Jovanovic. "LED driver with self-adaptive drive voltage." Power Electronics, IEEE Transactions on 23.6 (2008): 3116-3125. https://doi.org/10.1109/TPEL.2008.2004558
  8. Jong-Woo Choi, Jung-Sik Sung, Seong-Hee Park, Hyun-Chul Kang, Hyun-Joo Kang, Tae-Gyu Kang "The Active Radiant-heat Control of LED Lighting based on Driving Current and LED Temperature Sensing." The Korean Institute of Illuminating and electrical Installation Engineers, Proceedings of KIIEE Annual Conference , 2014. 5, pp.123-124.

Acknowledgement

Supported by : 울산과학대학교