전기학회논문지 (The Transactions of The Korean Institute of Electrical Engineers)

  • 제61권4호
  • /
  • Pages.612-616
  • /
  • 2012
  • /
  • 1975-8359(pISSN)
  • /
  • 2287-4364(eISSN)
대한전기학회 (The Korean Institute of Electrical Engineers)
권호 표지
DOI QR코드

DOI QR Code

LED 구동 IC를 위한 능동 전류 조절기의 설계

Design of an Active Current Regulator for LED Driver IC

  • 윤성진 (강원대 공대 전기전자공학과) ;
  • 오택준 (강원대 공대 전기전자공학과) ;
  • 조아라 (강원대 공대 전기전자공학과) ;
  • 기석립 (강원대 공대 전기전자공학과) ;
  • 황인철 (강원대 전기전자공학과)
  • 투고 : 2011.12.14
  • 심사 : 2012.03.08
  • 발행 : 2012.04.01
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

This paper presents an active current regulator for LED driver IC. The proposed driver circuit is consists of DC-DC converter for supplying constant DC voltage to LED, active current regulator for compensating channel-to-channel current error from LED strings and feedback circuit for controlling duty ratio of the converter. The proposed active current regulator senses current of LED channels by equalizing both $V_{DS}$ and $V_{GS}$ at LED current control transistor. Because the proposed circuit directly measures the LED channel current without a sensing resistor and regulates all channel with same regulation loop, the power consumption and the current error are much small compared with previous works. The measured maximum efficiency of overall LED driver IC is approximately 94% and current error of LED channel-to-channel is under ${\pm}1.3%$. The proposed LED driver IC is fabricated Dongbu 0.35um BCD process.

키워드

참고문헌

  1. Y. Hu and M. M. Jovanovic, "A New Current-Balancing Method for Paralleled LED Strings," IEEE Applied Power Electronics Conference and Exposition(APEC), pp. 705-712, March, 2011.
  2. H. Mu, G. Li and J. Liu, "A High Precision Constant Current Source Applied in LED Driver," Symposium on Photonics and Optoelectronics, pp. 1-4, May. 2011.
  3. Y. Hu and M. M. Jovanovic, "LED Driver with Self-Adaptive Drive Voltage," IEEE Transactions on Power Electronics, vol. 23, no. 6, pp. 3116-3125, Nov. 2008. https://doi.org/10.1109/TPEL.2008.2004558
  4. M. Doshi and R. Zane, "Digital Architecture for Driving Large LED Arrays with Dynamic Bus Voltage Regulation and Phase Shifted PWM," IEEE Applied Power Electronics Conference(APEC), pp. 287-293, Feb. 2007.
  5. E. C. Kang, D. K. Kwon, J. E. Yeon, D. S. Kim and W. Oh, "A New Low Voltage Detecting Method for Multi-String LED BLU Circuit," European Conference on Power Electronics and Applications(EPE '09), sept. 8-10, 2009.
  6. K. I. Hwu and Y. T. Yau, "Applying One-Comparator Counter-Based Sampling to Current Sharing Control of Multi-Channel LED Strings," IEEE Applied Power Electronics Conference(APEC), pp. 737-742, Feb. 21-25, 2010.
  7. J. H. Lee, L. Y. Jin, L. Z. Li, P. B. Ha, and Y. H. Kim, "Design of Parallel Backlight LED Driver IC," IEEE International conference on ASIC(ASICON), pp. 1125-1128, Oct. 2009.
  8. 박재현, 윤형도, 황성민, "자기 최적화된 능동 정전류원을 갖는 다중 채널 LED 드라이버의 설계," LED 학회지 제1권, 1호, pp. 70-78, 2009. 12.
  9. R. W. Erickson, and D. Maksimovic, "Fundamentals of Power Electronics," 2nd ed. Boston, MA:Kluwer, 2001.

피인용 문헌

  1. Simple LED driver with Constant Current Control vol.3, pp.4, 2014, https://doi.org/10.11142/jicems.2014.3.4.422