本論文之研究為一種可調光LED之驅動電路，所提出之LED驅動器採用以輸出疊接式為主的返馳式PFC轉換器，其利用定電壓返馳式PFC轉換器疊接定電流升壓型轉換器以驅動LED。本論文將對返馳式轉換器及升壓型轉換器之操作原理以及設計參數進行分析與討論，最後實作一額定輸出功率為87.5 W、額定輸出電流為0.35 A之可調光LED驅動電路，以驗證本論文所提架構之可行性。

This thesis aims to study a novel dimmable LED driver circuit. The proposed LED driver is based on flyback PFC converter with cascode-output design. Each LED string is driven by a constant-voltage controlled flyback circuit and a constant-current controlled boost converter in cascode. The operating principles and design considerations of the proposed LED driver are analyzed and discussed in detail. A 87.5- W/0.35-A prototype converter was implemented and tested. The experimental results are shown to verify the feasibility of the proposed scheme.

[1] S. H. Cha, D. K. Park, Y. J. Lee, C. S. Lee, J. H. Choi, J. S. Lee, and H. B. Lee, “AC/DC Converter Free LED Driver for Lightings,” in Proc. ICCE, pp. 706-708, 2012.
[2] W. Chen and S. Y. R. Hui, “A Dimmable Light-Emitting Diode (LED) Driver with Mag-Amp Post Regulators for Multistring Applications,” IEEE Transactions on Power Electronics, vol. 26, no. 6, pp. 1714-1722, Jun. 2011.
[3] Y. T. Hsieh and Y. Z. Juang, “Analysis and Suppression of Overcurrent in Boost LED Drivers,” Journal of Display Technology, vol. 9, no. 5, pp. 388-395, May 2013.
[4] 鄭世仁，「一般照明應用高效率可調光LED驅動器之研製」，國立台灣科技大學電子工程系博士論文，2010年。
[5] C. Y. Lin, S. J. Cheng, J. Y. Lin, H. J. Chiu, and Y. K. Lo, “Analysis and Design of a Push-Pull Quasi-Resonate Boost Power Factor Corrector,” in Proc. SPEEDAM, pp. 460-465, 2010.
[6] EPARC，電力電子學綜論，第一版，全華出版社，2007年。
[7] 張心樺，「一般室內照明可調光LED驅動電路之研製」，國立台灣科技大學電子工程系碩士論文，2011年。
[8] 蘇俊傑，「高效率200瓦LED路燈驅動電源研製」，國立台灣科
技大學電子工程系碩士論文，2011年。
[9] 廖國廷，「LED桌燈照明之高效率Twin-Bus調光技術」，國立台灣科技大學電子工程系碩士論文，2011年。
[10] 吳義利，「切換式電源轉換器原理與實用設計技術」，第一版，文笙書局，2012年。
[11] ST Microelectronics, “L6561, Enhanced Transition Mode Power Factor Correction,” Application Note, AN966, 2003.
[12] Y. Q. Hu, L. Huber, and M. M. Jovanovic, “Universal-Input Single-Stage PFC Flyback with Variable Boost Inductance for High-Brightness LED Applications,” IEEE-APEC, pp. 203-209, Feb. 2010.
[13] 鍾四維，「高效率LED路燈之輸出疊加式單級驅動電源研製」，國立台灣科技大學電子工程系碩士論文，2013年。
[14] 賴怡男，「具功因修正之單級器順向式LED驅動研製」，國立台灣科技大學電子工程系碩士論文，2011年。
[15] C. Adragna, “Design of Fixed-Off-Time-Control LED PFC Pre-Regulators with the L6562,” Application Note, AN1792, 2003.
[16] C. Adragna, S. De Simone, and G. Gattavari, “New Fixed-Off-Time PWM Modulator Provides Constant Frequency Operation in Boost PFC Pre-regulators,” in Proc. SPEEDAM, pp. 656-661, Jun. 2008.
[17] ST Microelectronics, “Solution for Designing a 400-W Fixed -Off-Time Controlled PFC Pre-Regulator with the L6562A” Application Note, AN2782, Aug. 2008.
[18] C. A. Yeh and Y. S. Lai, “Novel Hybrid Control Technique with Constant On/Off Time Control for DC/DC Converter to Reduce the Switching Losses,” in Proc. PEDS, pp. 848-853, Nov. 2009
[19] C. Adragna, “Design Equations of High-Power-Factor Flyback Converters Based on the L6561,” Application Note, AN1059, Jun. 1998.
[20] 梁適安，「交換式電源供應器之理論與實務設計」，第二版，全華圖書，2011年。
[21] 徐家康，「主僕式降壓型功率因數修正器之研製」，國立台灣科
技大學電子工程系碩士論文，2010年。