本論文針對返馳式架構之市電驅動LED燈之驅動器，進行改良與晶片實現，為了達到良好的隔離，並除去傳統光耦合器的缺點。本論文設計係用於返馳式LED設備的初級側輸出電流估算，原因是精確度是初級側輸出電流估算系統中最關鍵者。因此本論文提出的架構中，包含了二極體導通週期偵測電路及LED電流估算電路，前述二極體導通週期偵測電路負責偵測正確的二次側放電時間，而前述LED電流估算電路則鎖定初級側峰值電流，並產生正比於輸出電流的電壓。經量測結果證實LED電流估算電壓鎖定的最大誤差為10.28%。
另外，本論文進一步結合初級側輸出電流估算電路與準諧振邊界導通模式控制器，並整合在同一個晶片。準諧振模式最重要的是偵側波谷訊號，需要偵測輔助繞組電壓在二次側放電完畢震盪到第一個波谷的訊號，以供脈衝寬度調變(PWM)控制電路決定開關關閉的時間。然而波谷訊號非常容易誤判，本論文加入三項防誤判機制避免偵測錯誤，可避免交流電過零點時，能量太小無法耦合到二次側而造成無波谷訊號，開關再也無法啟動的問題。
本論文之LED驅動器輸出電壓可達到6~60 V，及4.2~42 W的輸出功率。而轉換器架構為單級的功率因數校正，並配合準諧振邊界導通模式控制器使用電壓隨耦控制法達到高功率因數，模擬結果功率因數達到0.991，總諧波失真為12.48%。

The main contribution of this thesis is aimed to the power efficiency enhancement of flyback-based LED drivers by using the proposed quasi-resonant flyback controller.
A primary side output current estimator for a flyback LED driver is firstly designed on silicon to achieve good isolation and avoid the shortcomings of using the traditional optocouplers. A LED current estimator and a diode conduction period detector are needed. The former samples and holds the primary side peak current to generate a voltage proportional to the LED current. The later is in charge of estimating the discharge time for the secondary side to prevent misjudgment of the period. The worst voltage locking error of LED current estimation is 10.28% by measurement.
Moreover, we then combine the primary side output current estimator with the quasi-resonant flyback converter to detect the valley signals of auxiliary winding voltage after the secondary-side discharge. This detected signal is for PWM (pulse width modulation) control circuit to determine the switch-off time of power MOSFET. However, the valley signal is very easy to be misjudged due to zero-crossing from AC power lines. Three anti-misjudge mechanisms are proposed to prevent such a problem. The key approach is to prevent the scenario that the energy is too small to be coupled to the secondary-side when the voltage of the AC power line crosses the zero and the switch is not turned on.
The output voltage range of the proposed driver is 6~60 V, and the output power is 4.2~42 W. The driver is basically a single-stage power factor correction. It combines the proposed quasi-resonant flyback controller with a voltage follower to achieve high power factor. The power factor is 0.991, while the total harmonic distortion is 12.48% by simulations.

論文審定書 i
論文摘要 iii
Abstract iv
目錄 v
圖目錄 ix
表目錄 xiv
1 研究背景與動機 1
1.1 前言 1
1.2 相關文獻與研究探討 5
1.2.1 隔離元件 5
1.2.2 柔性切換 9
1.3 研究動機 14
1.4 論文大綱 14
2 返馳式LED驅動器與初級側輸出電流估算電路 15
2.1 簡介 15
2.2 系統架構 15
2.3 返馳式轉換器設計 16
2.3.1 返馳式轉換器介紹 16
2.3.2 主動功因修正 22
2.4 初級側電流估算電路設計 29
2.4.1 二極體導通時間偵測電路設計 29
2.4.2 LED電流估算電路設計 31
2.5 電路模擬與預計規格 35
2.5.1 二極體導通時間偵測電路模擬 36
2.5.2 LED電流估算電路模擬 39
2.6 晶片實作與量測結果 44
2.6.1 返馳式轉換器系統量測結果 44
2.6.2 晶片量測結果 47
2.7 結果與討論 50
3 準諧振邊界導通模式之返馳式LED驅動器 51
3.1 簡介 51
3.2 系統架構 51
3.3 準諧振邊界導通模式之返馳式LED驅動器電路設計 53
3.3.1 波谷偵測電路設計 53
3.3.2 PWM 控制電路設計 57
3.3.3 補償電路設計 60
3.3.4 過電流保護電路設計 67
3.3.5 高壓緩衝器設計 68
3.4 電路模擬與預計規格 69
3.4.1 晶片佈局 69
3.4.2 波谷偵測電路模擬 70
3.4.3 PWM 控制電路模擬 72
3.4.4 補償電路模擬 73
3.4.5 過電流保護電路模擬 74
3.4.6 高壓緩衝器模擬 74
3.4.7 輸入LC濾波電路模擬 76
3.5 晶片實作與量測結果 77
3.5.1 晶片照相 77
3.5.2 晶片量測結果 78
3.6 結果與討論 80
4 結論與未來研究方向 81
4.1 研究成果與結論8 1
4.2 未來研究方向 82
參考文獻 85

[1] Cree Inc., Cree XLamp XP-G2 LEDs. [Online]. Available: http://www.cree.com/~/media/Files/Cree/LED-Components-and-Modules/XLamp/Data-and-Binning/XLampXPG2.pdf.
[2] Cree Inc., Durham, NC, USA, Cree Sets New R&D Performance Record with 254 Lumen-Per-Watt Power LED, 2012. [Online]. Available: http://www.cree.com/news-and-events/cree-news/press-releases/2012/april/120412-254-lumen-per-watt.
[3] United States Department of Energy, Solid-State Lighting R&D Multi-Year Program Plan, May 2014. [Online]. Available: http://apps1.eere.energy.gov/buildings/publications/pdfs/ssl/ssl_mypp2014_web.pdf.
[4] Richtek Inc., Guidelines for the RT7321 Off-line Linear LED Driver. [Online]. Available: http://www.richtek.com/Design Support/Technical Document/AN016.aspx.
[5] J. Kim and S. Park, “Synchronized floating current mirror for maximum LED utilization in multiple-string linear LED drivers,” in Proc. 2016 IEEE International Solid-State Circuits Conference (ISSCC), pp. 232–233, Feb. 2016.
[6] 阻容降壓原理. [Online]. Available: http://cocdig.com/docs/show-post-11473.html.
[7] 小型多通道光耦合器的關鍵技術： 堆疊LED結構. [Online]. Available: http://archive.eettaiwan.com/www.eettaiwan.com/ART_8800363813_480202_AN_d052ed69.HTM.
[8] 蘇鈺勛, “應用於電池管理系統之低功率跨域高壓資料傳送電路與補償讀取迴轉率之5T靜態隨機存取記憶體,” Master’s thesis, 國立中山大學, Jul. 2015.
[9] 蔡秉修, “用一個電流感測器量測同一條迴路上多個電器的方法,” Master’s thesis, 大同大學, Jul. 2013.
[10] C. Adragna, “Primary-controlled high-PF flyback converters deliver constant DC output current,” in Proc. 2011 14th European Conference on Power Electronics and Applications (EPE), pp. 1–10, Aug. 2011.
[11] J.-S. Li, T.-J. Liang, K.-H. Chen, Y.-J. Lu, and J.-S. Li, “Primary-side controller IC design for quasi-resonant flyback LED driver,” in Proc. 2015 IEEE Energy Conversion Congress and Exposition (ECCE), pp. 5308–5315, Sept. 2015.
[12] R. L. Steigerwald, “High-frequency resonant transistor DC-DC converters,” IEEE Transactions on Industrial Electronics, vol. IE-31, no. 2, pp. 181–191, May 1984.
[13] F. C. Lee, “High-frequency quasi-resonant converter technologies,” Proceedings of the IEEE, vol. 76, no. 4, pp. 377–390, Apr. 1988.
[14] 盧明志, “準諧振型返馳式電源轉換器之智慧型模糊比例積分型控制器,” Master’s thesis, 國立臺北科技大學, Jul. 2011.
[15] 陳鍾榮, “準諧振零電壓切換返馳式轉換器之研製,” Master’s thesis, 國立臺灣海洋大學, Jun. 2010.
[16] J. Baek, J. Shin, P. Jang, and B. Cho, “A critical conduction mode bridgeless flyback converter,” in Proc. 2011 IEEE 8th International Conference on Power Electronics and ECCE Asia (ICPE 2011-ECCE Asia), pp. 487–492, May 2011.
[17] J. T. Hwang, M. S. Jung, D. H. Kim, J. H. Lee, M. H. Jung, and J. H. Shin, “Off-theline primary side regulation LED lamp driver with single-stage PFC and TRIAC dimming using LED forward voltage and duty variation tracking control,” IEEE Journal of Solid-State Circuits, vol. 47, no. 12, pp. 3081–3094, Dec. 2012.
[18] J. Park, Y.-J. Moon, M.-G. Jeong, J.-G. Kang, S.-H. Kim, J.-C. Gong, and C. Yoo, “Quasi-resonant (QR) controller with adaptive switching frequency reduction scheme for flyback converter,” IEEE Transactions on Industrial Electronics, vol. 63, no. 6, pp. 3571–3581, Jun. 2016.
[19] G.-B. Koo, S.-C. Moon, and J.-T. Kim, “A new valley-detection method for the quasi-resonance switching,” in Proc. 2010 Twenty-Fifth Annual IEEE Applied Power Electronics Conference and Exposition (APEC), pp. 540–543, Feb. 2010.
[20] 吳益宏, “適用於脊髓電刺激系統之16 通道高壓電刺激產生器與脈衝頻率調變升壓轉換器,” Master’s thesis, 國立中山大學, Jun. 2013.
[21] 吳義利, 切換式電源轉換器：原理與實用設計技術（實例設計導向）. Taipei, Taiwan (R.O.C.): 文笙書局股份有限公司, 2015.
[22] 蕭英男, “返馳式轉換器之功因修正電路模組並聯運轉,” Master’s thesis, 國立中山大學, Jun. 2006.
[23] R. J. Baker, CMOS: Circuit Design, Layout, and Simulation (3rd Edition). Hoboken, NJ, USA: Wiley-IEEE Press, 2010.
[24] R. Hogervorst, J. P. Tero, R. G. H. Eschauzier, and J. H. Huijsing, “A compact powerefficient 3 V CMOS rail-to-rail input/output operational amplifier for VLSI cell libraries,” IEEE Journal of Solid-State Circuits, vol. 29, no. 12, pp. 1505–1513, Dec. 1994.
[25] 陳致霖, “適用於低ISM頻帶之自動取樣ASK解調變器與同步自動校正數位類比轉換器,” Master’s thesis, 國立中山大學, Jul. 2010.
[26] C.-L. Chen, Y. Hu, W. Luo, C.-C. Wang, and C.-Y. Juan, “A high voltage analog multiplexer with digital calibration for battery management systems,” in Proc. 2012 IEEE International Conference on IC Design and Technology (ICICDT), pp. 1–4, May 2012.
[27] Coilcraft Inc., Coilcraft GA0007-AL Flyback Transformer for ON Semiconductor NCP1351. [Online]. Available: http://www.coilcraft.com/ga0007.cfm.
[28] Cree Inc., Cree XLamp XM-L EasyWhite LEDs. [Online]. Available: http://www.cree.com/~/media/Files/Cree/LED-Components-and-Modules/XLamp/Data-and-Binning/XLampXML_EZW.pdf.
[29] R. W. Erickson and D. Maksimovic, Fundamentals of Power Electronics (2nd Edition). New York, NY, USA: Springer, 2001.
[30] Y.-C. Li and C.-L. Chen, “A novel single-stage high-power-factor AC-to-DC LED driving circuit with leakage inductance energy recycling,” IEEE Transactions on Industrial Electronics, vol. 59, no. 2, pp. 793–802, Feb. 2012.
[31] Q. T. Nha, M. M. Alam, H.-J. Chiu, and Y.-K. Lo, “Single-stage quasi z-source flyback power factor correction converter,” in Proc. 2012 International Conference on Anti-counterfeiting, Security, and Identification (ASID), pp. 1–5, Aug. 2012.
[32] X. Xie, J. Wang, C. Zhao, Q. Lu, and S. Liu, “A novel output current estimation and regulation circuit for primary side controlled high power factor single-stage flyback LED driver,” IEEE Transactions on Power Electronics, vol. 27, no. 11, pp. 4602–4612, Nov. 2012.
[33] K. Naraharisetti and P. B. Green, “Primary side regulated flyback AC-DC converter for LED’s,” in Proc. 2015 IEEE International Conference on Electro/Information Technology (EIT), pp. 117–121, May 2015.
[34] G. G. Pereira, M. F. de Melo, M. A. D. Costa, and J. M. Alonso, “High-Power-Factor LED Driver based on Input Current Shaper using a Flyback Converter,” in Proc. 2015 IEEE Industry Applications Society Annual Meeting (IAS), pp. 1–6, Oct. 2015.
[35] C.-C. Wang, Z.-Y. Hou, and T.-W. Huang, “A flyback driver with adaptive switching frequency control for smart lighting,” in Proc. 2016 IEEE International Conference on Consumer Electronics (ICCE), pp. 105–106, Jan. 2016.
[36] Z.-Y. Hou, T.-W. Huang, and C.-C. Wang, “On-chip accurate primary-side output current estimator for flyback LED driver control,” in Proc. 2016 International Conference on IC Design and Technology (ICICDT), pp. 1–4, Jun. 2016.
[37] Y.-T. Lin, T.-J. Liang, and K.-H. Chen, “IC design of primary-side control for flyback converter,” in Proc. 2013 1st International Future Energy Electronics Conference (IFEEC), pp. 449–453, Nov. 2013.