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研究生:江泙興
研究生(外文):Ping-hsing Chiang
論文名稱:柔性啟動之降壓直流轉換器設計
論文名稱(外文):BUCK CONVERTER WITH SOFT START
指導教授:黃淑絹黃淑絹引用關係
指導教授(外文):Shu-Chuan Huang
學位類別:碩士
校院名稱:大同大學
系所名稱:電機工程學系(所)
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2007
畢業學年度:95
語文別:英文
論文頁數:63
中文關鍵詞:降壓直流轉換器
外文關鍵詞:BUCK DC TO DC CONVERTER
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  • 被引用被引用:1
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本論文設計一具柔性啟動之降壓直流轉換器,並採用TSMC 0.35µm CMOS製程來作模擬。 整個電路是依據Lee及Mok [1]所提出之PWM電流模式直流電壓轉換器架構而設計的。此外,我們增加了柔性啟動電路,以避免電路在一開機時,因突波電流而造成電路損毀。模擬結果顯示,針對以電池供應在3V到5V為主的應用產品,此電路可操作在頻率300kHz到1MHz。在採用外部零件電容10-µF及電感4.7-µH的情況下,其輸出漣波電壓為20mV。此電路在供給電壓3V及負載電流200mA的狀態下,有最大功率效能94%。 line及load regulations分別約為0.24mV/mA及73.6mV/V。在典型輸出電壓為1.8V下,加入柔性啟動電路,可以將電源開啟時的峰值電感電流從1.14A減少到 749mA,因而證明該電路是有作用的。
A bulk DC-DC converter with soft start has been designed and simulated with TSMC 0.35µm CMOS models. The overall circuit is designed based on a current-mode PWM controlled converter proposed by Lee and Mok [1]. In addition, a soft-start circuit is added to avoid the instant surging current breaking down the circuit. Simulation results show that this converter with on-chip current sensor can operate from 300 kHz to 1 MHz with supply voltage from 3 to 5 V suitable for battery supply applications. The output ripple voltage is about 20 mV with a 10-µF off-chip capacitor and 4.7-µH off-chip inductor. The maximum power efficiency is 94% at load current 200mA and supply voltage 3V. The line and load regulations are 0.24mV/mA and 73.6mV/V, respectively. With a soft-start circuit, the peak inductor current at power-on is reduced from 1.14A to 749mA for an output of 1.8V. It proves that the circuit of the soft start is effective.
TABLE OF CONTENTS
CHAPTER 1 Introduction P1
1.1 Motivation P1
1.2 Specifications P1
1.3 Organization of the Thesis P3
CHAPTER 2 Fundamentals of Switching Voltage Regulator P4
2.1 DC-DC Converter Basics P4
2.2 Operational Principles of Buck Topology P9
2.3 Stability Analysis of Feedback Loop P10
2.4 CCM(Continuous Conduction Mode ) versus DCM P15
2.5 Current-Mode versus Voltage-Mode P17
2.6 Sub-harmonic for current-mode switching converters P19
CHAPTER 3 Circuit structure P23
3.1. Circuit structure P23
3.2 Bandgap Reference P24
3.3 Oscillator and Ramp Generator P28
3.4 Oscillator and Ramp Generator with Soft Start P35
3.5 Buffer P40
3.6 PWM Generator P42
3.7 Modulator P44
3.8 Error AMP P46
3.9 V-to-I Converter P48
3.10 Current Sensing P50
3.11 Integrated Power MOS P51
3.12 Circuit Component Values. P52
CHAPTER 4 SYSTEM SIMULATION RESULT P53
4.1 Output Ripples P53
4.2. Efficiency calculation .P55
4.3 Line and Load regulation P56
4.4 Soft Start Simulation P 59
4.5 Performance summery P59
Chapter 5 Conclusions P61
REFERENCES P62
[1]C. F. Lee and P. K. T. Mok, “A monolithic current-mode CMOS DC–DC converter with on-chip current-sensing technique,” IEEE Journal of solid-state circuits, vol. 39, no. 1, Jan. 2004.
[2]W. L. Huang, “A high efficiency CMOS DC-DC switching voltage regulator for low voltage application,” M.S. Thesis, Cheng-Kung Univ., Taiwan (R.O.C), vol. 73, pp. 11-15, July 2004.
[3]R. Erickson and D. Maksimovic, Fundamentals of Power Electronics, 2nd ed., Kluwer Accademic Publishers Co., 2001.
[4]J. N. Ross, The essence of Power Electronics, 1st ed. London, U.K.: Prentice Hall, 1997.
[5]“Power supplies, power management, and battery management,” Maxim Integrated Products, Sunnyvale, CA, http://www.maxim-ic.com.
[6]R. Mammano, “Switching power supply topology: voltage mode vs. current mode,” in Unitrode Design Note DN-62.Dallas, TX: Texas Instruments Incorporated, 1994.
[7]P. T. Krein, Elements of Power Electronics, New York, NY: Oxford Univ. Press, 1998.
[8]M. Brown, Practical Switching Power Supply Design, New York: John Wiley & Sons, 1990.
[9]C. Deisch, “Simple switching control method changes power converter into a current source,” in Proc. IEEE Power Electronics Specialists Conf., 1978, pp. 300–306.
[10]S. Hsu, A. Brown, L. Rensink, and R. Middlebrook, “Modeling and analysis of switching Dc-to-Dc converters in constant frequency current programmed mode,” in Proc. IEEE Power Electronics Specialists Conf., 1979, pp. 284–301.
[11]P. E. Allen and D. R.Holberg, CMOS Analog Circuit Design, 2nd ed., Oxford Univ. Press, 2002.
[12]G. Spiazzi, P. Mattavelli, L.Rossetto, “Sliding mode control of DC-DC converters,” http://www.dei.unid.it/el/Articoli/1997/Cobe/Cobe97.f, Feb. 2004.
[13]P. K. T. Mok, “Design of Power –Management Integrated-Circuit” in mixed-signal IC design consortium, Hsinchu, Taiwan (R.O.C), pp. 2-5. June 2005.
[14]R. Gregorian, Introduction to CMOS Op-Amps and Comparators, New York: Wiley, 1999.
[15]W. H. Ki, “Current sensing technique using MOS transistors scaling with matched bipolar current sources,” US Patent 5,757,174, May 26, 1998.
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