Title page for 945201021


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Student Number 945201021
Author Hsin-Hsin Ko(柯欣欣)
Author's Email Address No Public.
Statistics This thesis had been viewed 10088 times. Download 5867 times.
Department Electrical Engineering
Year 2007
Semester 1
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title A High Efficiency Synchronous CMOS Switching Buck Regulator with Accurate Current Sensing Technique
Date of Defense 2007-10-03
Page Count 107
Keyword
  • current sensing circuit
  • DC to DC converter
  • regulator
  • switching regulator
  • Abstract The fast growing demand of portable and battery-operated electronic systems has driven the efforts to reduce power consumption or to improve the efficiency of these electronic equipments. Regulators are essential for most electrically powered systems which include the prevalent portable equipments. Regulators are required to reduce the voltage variations of the battery. Besides, regulators are often utilized to provide a lower voltage from a higher input voltage for power reduction. Current trend in portable or battery-powered electronics demands ultra-low-power consumption or high operating efficiency to prolong the service time of these battery-operated equipments.
    In this thesis, the proposed current mode buck converter senses the inductor current variation to accelerate response time, and applies the mechanism of feedback-loop theory to control the output voltage at the desired value. Compared with the voltage mode buck converter, the current mode buck converter has better load regulation, better line regulation and faster transient response. The proposed buck converter has high efficiency, and, therefore, it is suitable for the application of portable products.
    This current mode switching regulator is fabricated with TSMC 0.18um 3.3V CMOS process. In the proposed buck converter, the operation voltage is form 2.4V to 4.6V, the loading current is form 0.05A to 0.5A, and the efficiency is 91.16%. The line regulation and load regulation are 6.27mV/V and 0.0107mV/mA respectively. The core area is 0.711mm2.
    Table of Content 摘要i
    Abstractii
    誌謝iv
    目錄v
    圖目錄viii
    表目錄xi
    第1章 緒論1
    1.1 背景簡介1
    1.2 研究動機2
    1.3 論文架構3
    第2章 直流轉直流穩壓器概論5
    2.1 穩壓器分類5
    2.1.1 線性穩壓器簡介(Linear Regulator)6
    2.1.2 切換式穩壓器簡介(Switching Regulator)7
    2.1.3 切換式電容穩壓器簡介(Switching Capacitance )8
    2.2 切換式穩壓器分類10
    2.2.1 降壓切換式穩壓器(Buck Converter or Step-Down Converter)10
    2.2.2 其他類型穩壓器13
    2.3 控制電路分類15
    2.3.1 電壓模式控制(Voltage Mode Control)15
    2.3.2 電流模式控制(Current Mode Control)17
    2.4 切換式穩壓器規格說明20
    2.4.1 轉換效能(Efficiency)20
    2.4.2 線性調節度(Line Regulation)22
    2.4.3 負載調節度(Load Regulation)22
    2.4.4 暫態響應(Transient Response)22
    第3章 降壓切換式穩壓器電路設計25
    3.1 系統架構25
    3.2 小訊號分析26
    3.2.1 電壓模式模型分析26
    3.2.2 電流模式模型分析37
    3.3 帶差參考電路(Bandgap Reference)47
    3.4 誤差放大器(Error Amplifier )49
    3.5 脈衝寬度寬度控制電路(PWM Control Circuit)51
    3.5.1 比較器電路(Comparator Circuit)51
    3.5.2 時脈產生器(Clock Generator)53
    3.6 緩啟動電路(Soft-Start Circuit)54
    3.7 電流偵測電路(Current Sensing Circuit)55
    3.7.1 偵測電感電流電路(L_sensing)55
    3.7.2 偵測感測電阻電流(R_sensing)61
    3.7.3 電壓轉電流轉換器(V-I Converter)61
    第4章 模擬結果65
    4.1 帶差參考電路模擬結果65
    4.2 降壓切換式穩壓器模擬結果67
    4.2.1 暫態模擬68
    4.2.2 規格模擬70
    第5章 低壓降切換式穩壓器佈局與量測75
    5.1 佈局考量75
    5.2 低壓降切換式穩壓器量測設定77
    5.3 量測結果81
    第6章 結論89
    第7章 參考文獻91
    Reference [1]National Semiconductor, ”Power ”High-Performance Analog Seminar 2007
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    [3]C. Y. Wang “A Current-Mode Buck Regulator with an Adjusted-Slope Compensation Ramp , ” NCKU MS. Thesis, 2005
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    [5]C.F.Lee and P.K.T. Mok ”A monolithic current-mode CMOS DC-DC Converter with On-Chip Current Sensing Technique,” IEEE JSSC Vol. 39, Issue 1, pp.3-14, Jan. 2004
    [6]C. Y. Leung; Mok, P.K.T.; K. N. Leung “A 1.2V buck converter with a novel on-chip low-voltage current-sensing scheme,” IEEE ISCAS Vol 5, pp. :V-824 - V-827 May 2004
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    IEEE Transactions on Power Electronics, pp. 271-280, April, 1991
    [10]Ridley, R. B., “A New Continuous-Time Model for Current-Mode Control with Constant On-Time, Constant Off-Time, and Discontinuous Conduction Mode,” IEEE Power Electronics Specialists Conference Record, San Antonio, Texas, June 1990, pp. 382-389
    [11]K. N. Leung, Philip K. T. Mok, “A Sub-1-V 15-ppm/ C CMOS Bandgap Voltage Reference Without Requiring Low Threshold Voltage Device,’’ IEEE J. Solid-State Circuits , Vol 37,pp.526-530, April 2002
    [12]D.J. Allstot, “A precision Variable-Supply CMOS Comparator,” IEEE J. Solid-State Circuits,Vol.SC-17,pp1080-1087,Dec.1982
    [13]Marshall, A. and Devore, J., “Dual Switch-Mode Regulator IC, ” Dig. Tech. papers ISSCC, pp.52-33,1995
    [14]W. H. Ki, “Current Sensing Technique using MOS Transistor Scaling with Matched Bipolar Current Sources,” U.S Patent 5,757,174 May 26 1998
    [15]R. Lenk, “Application bulletin AB-20 optimum current-sensing techniques in CPU converters,” Fairchild Semiconductor Application Notes, 1999
    [16]H. P. Forghani-zadeh and G. A. Rincón-Mora, “Current-sensing techniques for DC-DC converters,” in Proc. 2002 Midwest Symp. Circuits and Systems (MWSCAS), vol. 2 pp. 577–580. Aug. 2002
    [17]P. Midya, M Greuel and P. Krein, “Sensorless Current Mode Control-An Observer Technique for DC- DC Converters,” IEEE Trans. Power Electronics, vol. 16, pp. 522 –526, July 2001
    [18]E. Dallago, M. Passoni, and G. Sassone, “Lossless current-sensing in low-voltage high-current dc-dc modular supplies,” IEEE Trans. on Industrial Electronics, vol. 47, Dec. 2000, pp. 1249-1252
    [19]C. Y. Leung; Mok, P.K.T.and K. N. Leung “An integrated CMOS current-sensing circuit for low-Voltage current-mode buck regulator,” Circuits and Systems II: Express Briefs, IEEE Transactions on, vol. 52, pp. 394-397, 2005
    [20]B. Razavi, Design of Analog CMOS Integrated Circuits. New York: McGraw-Hill, 2001
    [21]T. Y. Yu “A High-Efficiency Synchronous CMOS Switching Regulator with PWM/PFM-Mode Operation, ” NCTU MS. Thesis, 2003
    [22]S. Y. Wang “ Improved Light- Load Frequency for Switched Mode Buck Converter Using PWM Operated Power-Save Mode,” NTHU MS. Thesis, 2004
    [23]Forghani-zadeh, H. P.and Rincon-Mora, G. A. “An Accurate, Continuous, and Lossless Self-Learning CMOS Current-Sensing Scheme for Inductor-Based DC-DC Converters ” IEEE JSSC Vol.42,pp 665-679, March 2007
    [24]Ridley Engineering, Inc.“ Current-Mode Control Modeling,” professional engineering seminar taught semiannually
    Advisor
  • Kuo-Hsing Cheng(鄭國興)
  • Files
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  • approve in 2 years
    Date of Submission 2007-10-15

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