Journal of the Korean Institute of Illuminating and Electrical Installation Engineers (조명전기설비학회논문지)

The Korean Institute of IIIuminating and Electrical Installation Engineers (한국조명전기설비학회)
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Novel LCD CCFL-backlight Electronic Ballast using the Phase-shift Full-bridge Inverter

위상천이 풀브리지 인버터를 이용한 새로운 LCD CCFL 백라이트 전자식 안정기

  • 정강률 (순천향대학교 전자정보공학과)
  • Received : 2009.12.30
  • Accepted : 2010.04.15
  • Published : 2010.06.30
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Abstract

This paper proposes a novel LCD CCFL-backlight electronic ballast using the phase-shift full-bridge inverter. The proposed electronic ballast reduces the ignition voltage and eliminates current spikes using the new digital dimming control applied with soft-starting. Thus the electronic ballast improves ignition behavior of the CCFL and hence increases the CCFL's life span. For this, this paper analyzes the full-bridge inverter topology of the proposed electronic ballast and explains the new digital dimming control algorithm applied to the ballast, briefly. And this paper shows a design example of the prototype circuit and explains an implementation method of the digital dimming control which is implemented on a single-chip microcontroller with software. This was implemented as actual prototype electronic ballast, and its experimental results showed that the proposed electronic ballast operates correctly. The ignition voltage of the prototype in the digital dimming operation was reduced about 30[%] compared with the conventional electronic ballast and there were not any current spikes.

본 논문에서는 위상천이 풀브리지 인버터를 이용한 새로운 LCD CCFL 백라이트 전자식 안정기를 제안한다. 제안한 전자식 안정기는 소프트스타팅이 적용된 새로운 형태의 디지털 디밍제어를 이용하여 CCFL의 점화전압을 감소시키고 전류스파이크를 제거함으로써, CCFL의 점화 특성을 향상 시키며 나아가 CCFL의 수명을 연장시킨다. 이를 위하여 본 논문은 제안한 전자식 안정기의 풀브리지 인버터 토폴로지를 간략하게 분석하고 여기에 적용된 새로운 디지털 디밍제어 알고리즘을 간단하게 설명한다. 그리고 본 논문은 프로토타입 회로의 설계예를 보이고 단일칩 마이크로컨트롤러 상에 소프트웨어적으로 구현되는 디지털 디밍제어의 구현 방식을 설명한다. 이것은 실제 프로토타입 전자식 안정기로 구현되었으며, 그 실험 결과를 통하여 제안한 전자식 안정기가 정확하게 동작함을 보였다. 제안한 전자식 안정기 프로토타입의 디지털 디밍제어 동작 시의 점화전압은 기존의 전자식 안정기와 비교하여 약 30[%] 정도 감소되었으며 어떠한 전류스파이크도 나타나지 않았다.

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References

  1. C. H. Lin, “The design and implementation of a new digital dimming controller for the backlight resonant inverter,” IEEE Trans. Power Elec., vol. 20, no. 6, pp. 1459-1466, Nov. 2005. https://doi.org/10.1109/TPEL.2005.857562
  2. Y. L. Lin and A. F. Witsulski, “Analysis and design of current-fed push-pull resonant inverters-cold cathode fluorescent lamp drivers,” in Proc. IEEE IAS Annu. Meeting, pp. 2149-2152, 1996. https://doi.org/10.1109/IAS.1996.563872
  3. M. Jordan and J. A. O'Connor, “Resonant fluorescent lamp converter provides efficient and compact solution,” in Proc. IEEE APEC, pp. 424-431, 1993. https://doi.org/10.1109/APEC.1993.290695
  4. G. H. Kweon, Y. C. Lim, and S. H. Yang, “An analysis of the backlight inverter by topology,” in Proc. IEEE ISIE Conf., vol.1, pp. 869-900, 2001. https://doi.org/10.1109/ISIE.2001.931588
  5. M. Gulko and S. B. Yaakov, “Current-sourcing push-pullparallel-resonance inverter (CS-PPRI): theory andapplication as a discharge lamp driver,” IEEE Trans. Ind.Electron., vol. 41, no. 3, pp. 285-291, Jun. 1994. https://doi.org/10.1109/41.293898
  6. M. S. Lin, W. J. Ho, F. Y. Shih, D. Y. Chen, and Y. P.Wu, “A cold-cathode fluorescent lamp driver circuit withsynchronous primary-side dimming control,” IEEE Trans.Ind. Electron., vol. 45, no. 2, pp. 249-255, Apr. 1998. https://doi.org/10.1109/41.681223
  7. G. C. Hsieh, C. H. Lin, C. H. Lin, and H. I. Hsieh, “Primary-side charge-pump dimming controller for the cold-cathode fluorescent lamp ballast,” IEEE TENCON'01, vol. 2, pp. 717-723, 2001. https://doi.org/10.1109/TENCON.2001.949685
  8. S. W. Lee, D. Y. Ko, D. Y. Huh, and Y. I. Yoo, “Simplified control technique for LCD backlight inverter systems using the mixed dimming method,” IEEE APEC'01, pp. 447-453, 2001. https://doi.org/10.1109/APEC.2001.911685
  9. F. Raiser, “Problem with lamp current using a PWM signal,” IEEE IAS'01, vol. 1, pp. 499-503, 2001. https://doi.org/10.1109/IAS.2001.955466
  10. C. H. Lin and K. J. Pai, “Differential-integral controllerfor the single-stage back-lighting electronic ballast,” IEEEPESC’03, vol. 2, pp. 1000-1005, 2003.
  11. C. H. Lin and K. J. Pai, “Digital-dimming controller with current spikes elimination technique for LCD backlight electronic ballast,” IEEE APEC'04, pp. 496-501, 2004. https://doi.org/10.1109/APEC.2004.1295803
  12. G. C. Hsieh and C. H. Lin, “Modeling and estimation of the fluorescent lamp and its pre-heating control,” J. Light Vis. Environ. Vol. 23, no. 1, pp. 1-9, 1999. https://doi.org/10.2150/jlve.23.1_1
  13. K. I. Hwu and Y. H, Chen, “A novel dimming technique for cold cathode fluorescent lamp,” IEEE PEDS2007, pp. 1085-1090, 2007. https://doi.org/10.1109/PEDS.2007.4487839
  14. S. Y. Ron Hui, L. M. Lee, H. S. Chung, and Y. K. Ho,“An electronic ballast with wide dimming range, high PF,and low EMI,” IEEE Trans. Power Elec., vol. 16, no. 4, pp.465-472, July 2001. https://doi.org/10.1109/63.931047