電流模式同步整流降壓轉換器-使用新型死區控制電路

Current mode Synchronism Buck Converter with a New Non-overlap Circuit

王偉(Wang, Wei)

指導教授 ： 郭建宏

淡江大學/工學院/電機工程學系碩士在職專班/碩士(2011年)

https://doi.org/10.6846/TKU.2011.00615

摘要

本論文之內容為設計及實現一個高頻切換的直流對直流同步整流降壓轉換器，其中高速切換的特性能縮小電源轉換器的輸出端濾波電感及電容的大小，能迎合現代科技講究的輕薄短小可攜性趨勢而訂定。非常適合用在MP3、PDA及手機等可攜式電子產品上。
高速切換雖然能縮小電源轉換器的輸出端濾波電感及電容的大小，但相對的每單位時間內死區發生的次數也增加。從另一角度分析，當每一週期時間縮短而死區長度不變，也代表死區時間所佔整個週期時間比例變大，這對於整體效率有某種程度的影響，而且隨著切換頻率繼續提升，此一影響也會越來越大。針對此一問題，論文裡提出一個可以偵測死區發生的偵測電路，當死區發生時能傳送出訊號並結束死區狀態。但若轉換器工作在非連續導通模式時，上述方式就不能正常工作，所以提出一個新型死區控制電路，結合新型及傳統的工作方式，使的轉換器能在連續導通模式及非連續導通模式狀態下都能正常動作。
此新型死區偵測電路及新型死區控制電路將透過CIC，使用台灣積體電路(TSMC)的CMOS 0.35um 2P4M 3.3V/5V mixed-mode製程投片驗證，此佈局面積約為1.46mm x 1.46mm，工作電壓範圍為2.4V至3.6V固定輸出1.8V，設計最大輸出電流為600mA。

關鍵字

降壓 ； 同步整流 ； 死區 ； 切換式電源 ； 交換式電源

並列摘要

The content of this paper is to design and implement a high-frequency switching DC-DC synchronous rectifier buck converter, which features that high-speed switching power converters can reduce the output filter inductor and capacitor size and that can pay attention to the light of modern technology to meet portability trend short set. Very suitable for MP3, PDA and mobile phones and other portable electronic products.

Although high-speed switching power converters can reduce the output filter inductor and capacitor size, the relative dead zone per unit time also increases the frequency of occurrence. From another perspective, if each cycle the length of time by the same die area, also on behalf of the dead time percentage share of the larger cycle time, which for the overall efficiency of a certain degree of impact, and continue with the switching frequency upgrade, this impact will grow. For this problem, the thesis proposes a place that can detect dead zone detection circuit when the death occurred can transmit a signal and end when the dead state. However, if the converter operates in discontinuous conduction mode, the method will not work. It presents a new dead zone control circuit, with new and traditional ways of working to make the conversion device in a continuous conduction mode and discontinuous conduction mode state can both operate normally.

The new dead zone detection circuit and the new dead-time control circuit through the CIC, using Taiwan Semiconductor (TSMC) in CMOS 0.35um 2P4M 3.3V5V mixed-mode chip verification process to vote, this layout area of about 1.46mm x 1.46mm, operating voltage range of 2.4V to 3.6V fixed output of 1.8V, maximum output current of the design 600mA.

並列關鍵字

DC/DC ； Buck ； Synchronism ； Dead-time ； PWM ； Current-mode

參考文獻

[2] Marty Brown, “Power Supply Cookbook”, 2nd Ed, Newnes, 2001.

[3] Behzad Razavi, “Design of Analog CMOS Integrated Circuit”, Mc Graw Hill, june 2002.

[5] 簡峯偉，高效率且廣範圍之雙模式降壓轉換器，碩士論文，國立中興大學電機工

[6] Ridley, RB., “A new continuous-time model for current-mode control”, PowerElectronics, IEEE Transaction on Volume 6, Issue 2, April 1991.

[7] Ridley, RB., “A new Continuous-time model for current-mode control with constant