切換式直流對直流升壓控制器之設計

Design of The Switched-Mode Boost DC-to-DC Controller

蘇育正(Yu-Cheng Su)

指導教授 ： 宋國明

國立臺北科技大學/機電學院/電機工程系所/碩士(2006年)

摘要

本論文提出不需鋸齒波產生器和誤差放大器的架構，利用比較器和輸出固定責任比的振盪器來控制開關的動作，完成升壓式直流電壓控制器，以提供小尺寸液晶顯示器(Liquid Crystal Display, LCD)所需的15V高直流偏壓。該架構有別於利用脈衝寬度調變(Pulse Width Modulation, PWM)或脈衝頻率調變(Pulse Frequency Modulation, PFM)的切換式直流升壓電源轉換器的電路架構。在脈衝寬度調變或脈衝頻率調變的架構下，需要一個鉅齒波訊號和一個誤差放大器輸出誤差訊號做比較，藉以控制開關的動作。

此晶片利用TSMC 0.35um 2P4M 混合信號製程來設計，面積為1.15×1.27mm2。輸入電壓範圍為3.0V~3.6V，工作頻率在200KHz~880KHz，負載在20mA~50mA變動下，輸出電壓均可維持15V 1%內，效率仍可維持80%以上。

關鍵字

直流對直流轉換器 ； 脈衝寬度調變 ； 脈衝頻率調變 ； 升壓

並列摘要

The thesis proposes a switched-mode boost DC-DC converter, which doesn’t need a sawtooth wave generator and a error amplifier. By using a comparator and a fixed-duty-cycle oscillator, the proposed controller will offer a high DC voltage of 15V, for the small size, Liquid Crystal Display (LCD).The proposed structure is different from those who are made with Pulse Width Modulation (PWM) or Pulse Frequency Modulation (PFM) techniques. In traditional PWM or PFM structure, they need to control switch by comparing the sawtooth wave signal with an error signal that provided by an error amplifier.

This design is implemented with TSMC 0.35 2P4M mixed-mode process, the area is 1.15×1.27mm2. The chip delivers regulated 15V 1% output voltage from a supply voltage of 3.0V~3.6V, frequency varies from 200KHz to 880KHz, and the power efficiency is greater than 80%, while provided 20mA~50mA of loading current.

並列關鍵字

DC to DC Converter ； Pulse Width Modulation ； Pulse Frequency Modulation ； Boost

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