近年來，由於發光二極體(Light Emitting Diode, LED)擁有低耗電量、元件壽命長、體積小、耐震以及容易驅動等優點，隨著發光效率與綠色能源的概念，因此被視為取代傳統照明光源，成為新一代照明系統之主流光源。本論文主要針對高亮度發光二極體（High Brightness LED）所需之驅動及調光控制電路進行研究。常見的LED驅動電路包含功率因數修正器(Power Factor Corrector, PFC)和直流/直流轉換器(DC/DC Converter)來實現高功率因數跟均流控制。本論文研究以單級返馳式功率因數修正器來縮減元件數與提高轉換效率，並發展雙匯流排(Twin-Bus)調光電路來達到節能。本論文除了詳細分析研究電路的動作原理以及設計考量之外，並實現一雛型電路驗證此架構與控制策略之可行性，根據實驗的驗證，整體轉換效率能有效地改善。

In recent years, due to the advance on the light-emitting diode (Light Emitting Diode, LED) with low power consumption, long life-time components, small size, shock, and easy to drive, etc., with luminous efficiency and the concept of green energy, LEDs gradually replace traditional lamps to be the next generation of lighting systems. This thesis aims to study the driving and dimming circuits for high-brightness LED lamps. Conventional LED driver circuits of a power factor corrector and a DC/DC converter to achieve high power factor and well current regulation. This thesis studies a single-stage Flyback PFC converter to reduce the component count and raise the conversion efficiency. Twin-bus dimming circuit is also developed to achieve energy saving. The operation principles and design considerations of the studied LED driver are analyzed and discussed. A laboratory prototype is designed and tested to verify the feasibility. According the experimental verifications, the overall conversion efficiency can be effectively improved.

[1] http://alger751225.pixnet.net/blog/post/21880195
[2] 江建成，「單級功因修正返馳式電源轉換器之製作」，國立中山大學電機工程學系碩士論文，民國九十六年七月。
[3] L. Moran, P. Werlinger, J. Dixon and R. Wallance, “A Series Active Power Filter which Compensates Current Harmonics and Voltage Unbalance Simultaneously,” in Proc. IEEE PESC Conf., pp. 222-227, 1995
[4] C. K. Tse, Y. M. Lai, R. J. Xie, and M. H. L. Chow, “Application of Duality Principle to Synthesis of Single-stage Power-factor-correction Voltage Regulators”, International Journal of Circuit Theory and Applications, Jun. 2003, pp. 555-570.
[5] C. Souvik, K. Rajaganesh and V. Ramanarayanan, “Impedance Emulation Method for a Single Phase Shunt Active Filter,” In Proc. IEEE APEC Conf., vol. 2, 2003, pp. 907-912.
[6] Laszlo Huber, Brian T. Irving, and Milan M. Jovanovic´, “Open-loop Control Methods for Interleaved DCM/CCM Boundary Boost PFC Converters,” IEEE Trans. Power Electronics., vol. 23, no. 4, pp. 1649-1657, July 2008.
[7] J. Zou, X. Ma, C. K. Tse, and D. Dai, “Fast-scale Bifurcation in Power-factor-correction Buck-boost Converter and Effects of Incompatible Periodicities,” International Journal of Circuit Theory and Applications, Vol. 34, No. 3, pp.251 -264, Mar 2006.
[8] H. Wei and I. Batarseh, “Comparison of Basic Converter Topologies for Power Factor Correction,” in Proc. IEEE Southeastcon Conf., 1998, pp 348-353.
[9] T. F. Wu, C. C. Chen, C. H. Lee, C. L. Shen and Y. C. Wu, “Analysis, Design and Practical Consideration of a 500 W Power Factor Corrector with Soft Switching Feature,” in Proc. IEEE IAC Conf., vol. 4, 2000, pp. 2418-2425.
[10] H. J. Chiu, H. M. Huang, H. T. Yang, and S. J. Cheng “An improved single-stage Flyback PFC Converter for High-luminance Lighting LED Lamps,” International Journal of Circuit Theory and Applications, Vol. 32, No. 2, pp. 205-210, Mar 2008
[11] M. Rico-Secades, A. J. Calleja, J. Ribas, E. L. Corominas, J. M. Alonso, J. Cardesin, and J. Garcia-Garcia, “Evaluation of a Low-cost Permanent Emergency Lighting System Based on High-efficiency LEDs,” IEEE Transactions on Industry Applications, Vol. 41, No. 5, Sept.-Oct. 2005, pp.1386-1390.
[12]“高亮度發光二極體市場發展趨勢與展望”，%2