低電磁干擾之高效率脈波寬度調變穩壓器設計

The Design of a Low EMI High Efficiency PWM Regulator

陳靜惠(CHen, Ching-Hui)

指導教授 ： 劉萬榮 ； 黃淑絹

國立臺北大學/電機資訊學院/電機工程研究所/碩士(2011年)

摘要

本論文提出低電磁干擾、直流對直流降壓切換式穩壓器/轉換器，轉換器在高負載電流的情況下會切換至脈衝寬度調變模式。在負載電流3mA~400mA 之間運作時，轉換效率皆可達到90%~95%的高效率，且加入軟啟動電路操作，限制當穩壓器啟動時瞬間過大的啟動電流。故本論文提出低電磁干擾之高效率脈波寬度調變穩壓器設計，在鋸齒波時脈產生器加入展頻技術，使脈波寬度調變訊號微幅調動，平均分散主基頻，降低電磁干擾。
最後本論文使用台灣積體電路公司0.35μm 2P4M 3.3V/5V CMOS製程來實現，其整體轉換效率可以達到95%，總晶片面積為2.39186×2.39024 mm2。

關鍵字

脈波寬度調變 ； 穩壓器 ； 電磁干擾 ； 降壓 ； 展頻

並列摘要

This paper presents low EMI and high efficiency DC to DC stepdown (Buck) switching regulator/converter. The regulator can be switched to pulse-width modulation mode as the load current is high. Conversion efficiency of this work can reach for 90-95% when load current from 3 to 400 mA. Soft start circuit operation is designed to eliminate the excess large current at the start up of the regulator. And Spread spectrum techniques are adopted in Sawtooth Oscillator that make the frequency of PWM signal influctuating slightly, and separate the energy in the fundamental frequency averagely for EMI reduction.
The circuit is designed with tsmc 0.35μm 2P4M 3.3V/5V mixed-signal CMOS process. The best total power efficiency of this integrated circuit achieves 95%, and the chip area is 2.39186×2.39024 mm2.

並列關鍵字

PWM ； Regulator ； EMI ； Buck ； Spread spectrum

參考文獻

[7] C. C. Tseng, "Design of a Low EMI Synchronous Dual-Mode Boost Regulator," M.S.Thesis, National Taipei University, Jul. 2010.

[16] A. Hastings and R. A. Hastings, The art of analog layout: Prentice Hall, 2001.

[3] H. H. Yang, "A Step-Down Regulated Charge-Pump DC-DC Converter," 2008.

[4] A. I. Pressman, et al., Switching power supply design: McGraw-Hill Professional, 2009.

[5] R. W. Erickson, "DC-DC power converters."