臺灣博碩士論文加值系統

本文旨在研製一全數位化高功因高效率AC/DC轉換器，作為LCD-TV之供應電源，系統架構包含前級為無橋式功因修正器，減少橋式整流器的導通損失，電流控制迴路使用預測電流模式控制使輸入電流追隨輸入電壓，並達到單功因目標，電壓控制迴路使用PI控制器達到輸出穩壓;後級為LLC諧振轉換器，利用變頻控制器調節輸出電壓，一次側利用諧振元件達成零電壓切換以減少切換損失，二次側加入同步整流技術以減少導通損失增加效率。

本文電路使用PSIM模擬軟體對設計結果進行分析。系統採用數位信號處理器TMS320F28035作為控制核心，發展電壓及電流迴路控制，並完成300W之系統，輸入電壓為110V/60Hz，輸出電壓為24V。滿載情況下，效率達91.8%，功率因數為0.996。

This thesis present the design and implementation of a Fully-digitalized AC/DC converter with high power factor and high efficiency for LCD-TV power system. The front stage is a bridgeless power factor corrector, the conduction loss in the rectifier bridge can be reduced. The predictive current control with constant switching frequency is used for current loop to force the input current and voltage in phase and raise the power factor to unity, the PI control law is used for voltage loop to stabilize output voltage; The second stage is LLC resonant converter, a variable frequency controller is used to regulate output voltage, the resonant component which makes the switch of primary side to achieve zero voltage switching and reduce switching loss, a synchronous rectifier is added in the secondary side to reduce conduction loss and improve efficiency.
In this thesis, the proposed circuit is simulated by PSIM to analyze the performance of the design results. The digital signal processor TMS320F28035 is used to develop the control functions of voltage and current loop. An experimental system of 300W output power with 24Vdc for AC110V/60Hz input is constructed, experimental data show that the power factor and the efficiency is 0.996 and 91.8% under full load condition.

中文摘要 i
英文摘要 ii
誌謝 iii
目錄 iv
表目錄 vi
圖目錄 vii
第1章 緒論 1
1.1 研究背景與動機 1
1.2 文獻回顧 2
1.2.1 功因校正技術 2
1.2.2 半橋式諧振轉換器 4
1.3 本文架構簡介 6
1.4 本文大綱 7
第2章 系統架構之分析與設計 8
2.1 無橋式功因修正器之設計 8
2.2 無橋式功因修正器之模擬 12
2.3 LLC諧振轉換器之系統分析 15
2.3.1 增益分析 15
2.3.2 操作區域分析 17
2.3.3 轉換器動作原理 19
2.4 諧振槽參數設計 23
2.5 LLC諧振轉換器之控制 27
2.6 LLC諧振轉換器之模擬 28
第3章 系統電路設計與軟體規劃 32
3.1 系統整體架構 32
3.2 無橋式功因修正器之硬體電路 33
3.2.1 電壓回授電路及零交越點偵測電路 33
3.2.2 電流回授電路 34
3.2.3 閘極驅動電路 35
3.3 LLC諧振轉換器之硬體電路 36
3.3.1 電壓回授電路 36
3.3.2 閘極驅動電路 37
3.3.3 同步整流控制IC 37
3.4 數位信號處理器 40
3.4.1 TMS320F28035簡介 40
3.4.2 軟體流程規劃 41
3.4.3 數位控制器 43
第4章 實驗結果分析 45
4.1 實驗目標 45
4.2 無橋式功因修正器之實驗結果 45
4.3 LLC諧振轉換器之實驗結果 51
4.4 結果討論 57
第5章 結論與未來展望 58
5.1 結論 58
5.2 未來展望 58
參考文獻 59

[1] K. N. Sakthivel, S. K. Das, and K. R. Kini, “Importance of Quality AC Power Distribution and Understanding of EMC Standards IEC61000-3-2, IEC61000-3-3 and Distribution and Understanding of EMC Standards IEC61000-3-2, IEC61000-3-3 and IEC 61000-3-11, ” in Proc. IEEE INCEMIC, 2003, pp. 423-430.
[2] G. Hua and F. C. Lee, “Soft-Switching Techniques in PWM Converters, ” IEEE Transactions on Industrial Electronics, vol. 42, no.6, pp. 595-603, Dec. 1995.
[3] K. H. Liu and F. C. Lee, “Zero-voltage switching technique in DC/DC converters,” IEEE Transactions on Power Electronics, vol. 5, no. 3, pp. 293-304, Jul. 1990.
[4] R. L. Steigerwald, “A comparison of half-bridge resonant converter topologies , ”IEEE transaction on Power Electronics, vol. 3, no. 2, pp. 174-182, Apr. 1988.
[5] V. Vorperian and R. B. Ridley, “A simple scheme for unity power-factor rectification for high frequency AC buses,” IEEE Transactions on Power Electronics, vol. 5, no. 1, pp. 77-87, Jan. 1990.
[6] H. Wei and I. Batarseh, “Comparison of basic converter topologies for power factor correction,” in Proc. IEEE Southeastcon’98, 1998, pp. 348-353.
[7] L. H. Dixon , “High power factor preregulators for off line power supplies,” Unitrode Application Note, 2003.
[8] R. Srinivasan and R. Oruganti, “A Unity Power Factor Converter Using Half-Bridge Boost Topology,” IEEE Transactions on Power Electronics, vol. 13,no. 3, pp. 487 -500, May 1998.
[9] Y. K. Lo, S. Y. Ou, and H. J. Chiu, “On Evaluating the Current Distortion of the Single-Phase Switch-Mode Rectifiers With Current Slope Maps,” IEEE Transactions on Industrial Electronics, vol. 49, no. 5, pp. 1128-1137, Oct. 2002.
[10] 陳雅君，LLC諧振轉換器之設計與研製，國立成功大學電機工程學系碩士論文，2009
[11] B. Yang, Topology investigation for front end DC/DC power conversion for distributed power system, Ph. D. Dissertation, Virginia Tech, 2003.
[12] B. Yang, F. C. Lee, and A. J. Zhang, “LLC resonant converter for front end DC/DC conversion, ” in Proc. IEEE APEC’02 vol. 2, 2002, pp. 1108-1112.
[13] B. Lu, W. liu, Y. Liang, F. C. Lee, and J. D. van Wyk “Optimal Design Methodology for LLC Resonant Converter, ” in Proc. IEEE APEC’06, 2006, pp. 533-538.
[14] B. Yang, R. Chen, and F.C. Lee, “Integrated Magnetic for LLC resonant converter,” in Proc. IEEE APEC’02, vol. 1, 2002, pp. 346-351.
[15] V. Leonavicius, M. Duffy, U. Boeke, and S.C.O.Mathuna , “Comparison of realization techniques for PFC inductor operating in discontinuous conduction mode,” IEEE Transactions on Power Electronics, vol. 19, no. 2, pp. 531-541, Mar. 2004.
[16] Z. Yang and P. C. Sen, “ Power Factor Correction Circuit with Robust Current Control Technique,” IEEE Transactions on Aerospace and Electronic System, vol. 38, no. 4, pp. 1210-1219, Oct. 2002.
[17] R. W. Erickson and D. Maksimovic, Fundamentals of Power Electronics, Kluwer Academic Publishers, 2nd edition, 2000.
[18] H. Z. Azazi, E. E. EL-Kholy , S. A. Mahmoud, and S.S.Shokralla , “Digital Control of Boost PFC AC-DC Converters with Predictive Control ,” in Proc. MEPCON’10,2010, pp.721-727.
[19] T.Duerbaum, “First harmonic approximation including design constraints, ” in Proc. IEEE TELEC’98, 1998, pp.321-328.
[20] J. H. Jung and J. G. Kwon, “Theoretical analysis and optimal design of LLC resonant converter,” in Proc. IEEE APEC’07, 2007, pp. 1-10.
[21] G. C. Hsieh, C. Y. Tasi, and W. L. Hsu, “Synchronous rectification LLC series-resonant converter,” in Proc. IEEE APEC, 2007, pp. 1003–1009.
[22] D. Fu, F. C. Lee, and M. Xu, “A Novel Driving Scheme for Synchronous Rectifiers in LLC Resonant Converters,” IEEE Transactions on Power Electronics, vol. 24, no. 5, pp. 1321-1329, May 2009.
[23] J. F. Lazar and R. Martinelli, “Steady-state analysis of the LLC series resonant converter,” in Proc. IEEE APEC’01, vol. 2, 2001, pp. 728-735.
[24] Fairchild Semiconductor, “Half-bridge LLC resonant converter design using FSFR-series Fairchild power switch,” Application Note AN-4151, 2007.
[25] ST Microelectronics, “LLC resonant half-bridge converter design guideline,” Application Note AN-2450, 2007.
[26] NXP semiconductor, “TEA1795T GreenChip synchronous rectifier controller, ” Application Note TEA1795T,2010.
[27] A. V. Oppenheim, R. W. Schafer, and J. R. Buck, Discrete-Time Signal Processing, 2nd ed. New Jersey: Prentice Hall, 1999.