定頻控制之電子式安定器中，其功因修正電路輸出之直流鏈電壓載有兩倍市電頻率的低頻漣波，此直流鏈電壓漣波經過換流器之後，將會在螢光燈管電壓和功率產生兩倍市電頻率之低頻變化，造成光輸出之低頻閃爍。在需要穩定光源之場合，如影像檢測系統，若無法取得穩定之光源，將會降低判斷之準確度。因此，本文提出一低光源閃爍螢光燈電子式安定器，其操作原理為偵測直流鏈電壓作為前饋信號，並依據直流鏈電壓之大小，調整換流器之切換頻率，以改變燈管電壓之電壓增益，降低燈管電壓之低頻變化，使螢光燈管之光輸出為固定。最後，以電腦模擬與實作驗證此方法為可行。

　　In electronic ballast for fluorescent lamp with constant-frequency control, the DC-bus voltage fed by a power-factor corrector has a low frequency ripple, which is two times of the utility-line frequency, and the low-frequency DC-bus voltage ripple can cause lighting flicker on fluorescent lamps. In application of a precise image-detecting system, a lighting source, such as a fluorescent lamp, with low lighting flicker is needed. An electronic ballast circuit for fluorescent lamp with low lighting flicker is proposed in this thesis. The operating principle of the ballast is to detect the DC-bus voltage ripple as a feed-forward signal in order to change the switching frequency of the inverter. Thus, the voltage gain of the resonant tank is adjustable. As a result, the lighting flicker caused by the DC-bus voltage ripple can be decreased. Finally, the experimental results are in agreements with simulation ones, verifying the functionality of the proposed circuit.

[1] W. Elenbass, Fluorescent Lamps and Lighting, The MacMillan Company, New York, 1959.
[2] E.E. Hammer, “Fluorescent Lamp Starting Voltage Relationships at 60Hz and High Frequency,” Journal of the Illuminating Engineering Society, PP.36-46, Oct. 1983.
[3] American Nation Standards for Fluorescent Lamp-Rapid-start Types-Dimensional and Electrical Characteristics, American National Standards Institute. Inc.
[4] C. S. Moo, W. M. Chen, and H. C. Yen, ”A series-resonant electronic ballast for rapid-start fluorescent lamps with programmable starting,” Power Conversion Conference, in Proc. PCC Osaka 2002, pp.95 –99, 2002.
[5] H. Wei and I. Batarseh, “Comparison of basic converter topologies for power factor correction,” in Proc. IEEE Southeastcon '98, pp.348 –353, 24-26 Apr. 1998.
[6] J. Sebastian, M. Jaureguizar, and J. Uceda, “An overview of power f actor correction in single-phase off-line power supply systems,” in Conf. Rec. IEEE IECON'94, 1994, pp.1688 –1693.
[7] K.-H. Liu and Y.-L. Lin, “Current waveform distortion in power factor correction circuits employing discontinuous-mode boost converters,” in Conf. Rec. IEEE PESC '89, 1989, pp.825 –829.
[8] A. Kandianis and S.N. Manias, “A comparative evaluation of single-phase SMR converters with active power factor correction," in Conf. Rec. IEEE IECON '94, 1994, pp.244 –249.
[9] M. Kazerani, P. D. Ziogas, and G. Joos, ”A novel active current waveshaping technique for solid-state input power factor conditioners,” IEEE Trans. Ind. Electron., vol.38, pp.72 –78, Feb. 1991.
[10] M. K. Kazimierczuk and D. czarkowski, ”Resonant Power Converters,” New York: John Wiley&Sons, INC., 1995.
[11] W. R. Alling “Important design parameters for solid-state ballasts, ” IEEE Trans. Ind. Applicat., vol.25, pp.203 –207, Mar./Apr. 1989.
[12] J. S. Subjak and J. S. Mcquilkin, “Harmonics-Causes. Effects,Measurements, and Analysis: An Updata,” IEEE Transaction on Industry Applications, Vol.26, No. 6, pp. 1034-1042, Nov./Dec.1990.
[13] R. P. Stratford, “Harmonic Pollution on Power Systens-A Change in Philosophy,” IEEE Transactions on Industry Applications, Vol. 16, No. 5, Sep./Oct. 1980.
[14] H. Endo, T. Yamashita, and T. Sugiura, “A High-Power-Factor Buck Converter,” Conference Record in IEEE Power Electronics Specialists Conference, pp. 1071-1076, 1992.
[15] J. C. Salmon, “Techniques for Minimizing the Input Current Distortion of Current-Controlled Single-Phase Boost Rectifiers,” IEEE Trans. Power Electron., Vol. 8, No. 4, pp. 509-520, Oct. 1993.
[16] C. Zhou, R. B. Ridley, and F. C. Lee, “Design and Analysis of a Hysteretic Boost Power Factor Correction Circuit,” in Conference Record of Power Electronics Specialist Conference, pp. 800-807, 1990.
[17] R. Prasad, P. D. Ziogas, and S. Manias, “A New Active Power Factor Correction Method for Single-Phase Buck-Boost AC-DC Converter,” Conference Record of the 1992 IEEE Industry Application Society Annual Meeting, pp.814-820, 1992.
[18] 吳財福，余德鴻， “電子式安定器綜論”全華科技圖書股份有限公司出版86年6月。
[19] R. Severns, “Topologies for Three-Element Resonant Converter,” IEEE Transactions on Power Electronics, Vol. 7, No. 1, pp. 89-98, Jan. 1992.
[20] STMicroelectronics, Design Equation of High Power Factor Converters Based on the L6561, L6561, 2000.
[21] C. Y. Lin, ”Design and Analysis of Piezoelectric Transformer converters,” Ph.D. dissertation,Dept. Elect. Eng. , Virginia Polytechnic Institute and State Univ. , Blacksburg,Virginia,1997.
[22] STMicroelectronics, Regulating pulse width mudulator, SG3525A, 1998.
[23] 黃建銘， “變頻填谷濾波返馳式轉換器”，國立成功大學電機工程學系碩士論文，中華民國九十二年。
[24] J. A. Alves, A. J. Perin, and I. Barbi, ”An electronic ballast with high power factor for compact fluorescent lamps,” in Conf. Rec. IEEE-IAS Annu. Meeting, 1996,pp.2129-2135