Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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A Study on the Equivalent Model of an External Electrode Fluorescent Lamp Based on Equivalent Resistance and Capacitance Variation

  • Cho, Kyu-Min (Dept. of Electrical Engineering and Computer Science, Korea Advanced Institute of Science and Technology) ;
  • Oh, Won-Sik (Dept. of Electrical Engineering and Computer Science, Korea Advanced Institute of Science and Technology) ;
  • Moon, Gun-Woo (Dept. of Electrical Engineering and Computer Science, Korea Advanced Institute of Science and Technology) ;
  • Park, Mun-Soo (LCD Development Center, Samsung Electronics Co. Ltd.) ;
  • Lee, Sang-Gil (LCD Development Center, Samsung Electronics Co. Ltd.)
  • Published : 2007.01.20
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Abstract

An External Electrode Fluorescent Lamp (EEFL) has longer lifespan, higher power efficiency and higher luminance than a Cold Cathode Fluorescent Lamp (CCFL). Moreover, it is easy to drive them in parallel. Therefore, the EEFL is expected to quickly replace the CCFL in LCD backlight systems. However, the EEFL has more complex characteristics than the CCFL with a resistive component, because it has both a resistive component by plasma and a capacitive component by external electrode. In this paper, values of resistance and capacitance are measured at several power levels and at several operating frequencies. They are expressed by a numeral formula based on a linear approximation that represents the equivalent resistance and capacitance as a function of power. Then we made block diagram of the equivalent circuit model using numerical expressions. Simulation waveforms and experimental results are presented to verify the feasibility of the equivalent model.

Keywords

References

  1. T. S. Cho, N. O. Kwon, H. S. Kim, S. J. Kim, J. G. Kang, E. H. Choi, and Guangsup Cho, 'Capacitive coupled electrodeless discharge backlight driven by square pulses', IEEE Transactions on Plasma Science, Vol. 30, No.5, pp. 2005-2009, October 2002 https://doi.org/10.1109/TPS.2002.807501
  2. N. O. Kwon, 'Self-discharge synchronizing operations in the external electrode fluorescent multi-lamps backlight', Asia Display/IDW'01, Procedings, Nagyoya, Japan, pp. 625-628
  3. U. Mader, and P Horn, 'A Dynamic model for the electrical characteristics of fluorescent lamps', IEEE-IAS'92, Anais, pp. 1928-1934, 1992
  4. L. F. Weber and K. W. Warren, 'Power efficient sustain drivers and address drivers for plasma panel' U.S. Patent 4 866 349, Sept. 1989
  5. Guangsup Cho, J. Y. Lee, D. H. Lee, S. B. Kim, H. S. Song, Jeuan Koo, B.S. Kim, J. G. Kang, E. H. Choi, U. W. Lee, S. C. Yang, and J. P. Verboncoeur, 'Glow discharge in the external electrode fluorescent lamp', IEEE Transactions on Plama Science, Vol.33, No.4, pp. 1410-1415, August 2005 https://doi.org/10.1109/TPS.2005.852434
  6. M. Cervi, A. R. Seidel, F. E. Bisogno, and R. N. Prado, 'Fluorescent lamp model employing tangent approximation', IEEE-ISA'01 Annual Meeting Records
  7. T. F. Wu, J. C. Hung, and T. H. Yu, 'A PSpice model for fluorescent lamps operated at high frequencies', IEEE IECON'95 Proceedings, Vol.1, pp. 359-364, 1995