免斜率補償之單電感二階型高轉換比之平均電流模式降壓轉換器

電源管理IC一直以來都是科技發展的重要項目之一，在現今電子產品除了要求輕、薄，短、小、省電及效率高之外，更要求其反應速度要快速、穩定。為因應這樣的需求，電源管理IC的設計也偏向低輸入電壓，低輸出電壓的發展，因此一個可以提供高轉換比的二階型降壓轉換器將是一個可行的方向。本研究為了能夠擁有快速暫態特性反應，將利用平均電流模式控制電路來達成此目的。另外使用了電流感測電路可以全時感測電感電流，並利用電壓-電流轉換器、電流比較器與積分電路來完成平均電流模式控制。在電壓迴路的部分，利用PID控制器可調整系統的增益與相位的特性，對系統的速度與穩定性做適當的調整，並結合電流模式控制，利用脈波寬度調變的方式來進行控制；且外部零件僅需要一個電感兩個電容。此晶片是以台灣積體電路公司零點三五微米兩層多晶矽四層金屬互補式金屬氧化物半導體製程來實現。此晶片面積為1917 2334 ；在正常工作範圍之下所模擬的結果為：最大負載電流200mA；輸入電壓範圍2.5V~5.0V；輸出電壓範圍1.0V∼0.5V；頻率範圍400KHz~800KHz。

關鍵字

二階型；高轉換比；平均電流模式；降壓轉換器

並列摘要

Power management ICs have been one of the most important development in technology. Nowadays electronic devices must be small-sized, with low-power consumption, high efficiency and high speed as well. The power supply of power manage IC also use low-input voltage and low-output voltage. In this thesis a quadratic high-conversion-ratio buck converter with an average current-mode control is used to perform fast-response. Besides, an active current sensing circuit is provided to sense full-time inductor current; an v-i converter, a current comparator and an integral circuit are used to compose average current mode control. In Voltage loop structure, PID Controller, which can modify the phase and gain in the system, is used to make sure the speed and stability. The quadratic high-conversion-ratio buck converter consist voltage loop, current loop and pluse width modulation, which is needed only a inductor and two capacitor. The chip is implemented with a TSMC 3.3V 0.35um CMOS DPQM process and the chip area is 1917*2334um including I/O PADs. In general, maximum output current is 200mA, input voltage is 2.5V~5.0V, output voltage is 1.0V~0.5V, switch frequency is 400KHz~800KHz.

並列關鍵字

Quadratic ； High-Conversion-Ratio ； Average-Current-Mode ； Buck Converter

參考文獻

[1] X. Jinwen, A. V. Peterchev, Z. Jianhui, and S. R. Sanders, “A 4-μa quiescent-current dual-mode digitally controlled buck converter IC for cellular phone applications,” IEEE J. Solid-State Circuits, vol. 39, no. 12, pp. 2342-2348, Dec. 2004.

[2] H. W. Huang, C. C. Chien, K. H. Chen, and S. Y. Kuo, “Highly efficient tri-mode control of buck converters with load sensing technique,” in IEEE Power Electronics Specialists Conf., Jun. 2006, pp. 1-4.

[4] B. Sahu and G. A. Rincon-Mora, “A high-efficiency, dual-mode, dynamic, buck-boost power supply IC for portable applications,” in Int. Conf. on VLSI Design, Jan. 2005, pp. 858-861.

[5] W. R. Liou, M. L. Yeh, and Y. L. Kuo, “A high efficiency dual-mode buck converter IC for portable applications,” IEEE Trans. on Power Electronics, vol. 23, no. 2, pp. 667-677, Mar. 2008.

[6] M. Belloni, E. Bonizzoni, and F. Maloberti, “On the design of single-inductor multiple-output DC-DC buck converters,” in IEEE Int. Symp. on Circuits and Systems, May 2008, pp. 3049-3052.

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免斜率補償之單電感二階型高轉換比之平均電流模式降壓轉換器

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