利用脈波頻率調變之升壓轉換器積體化的設計與實現

Design and Implementation of Integrated Boost Converter with Pulse-Frequency Modulation Technique

魏道康(Dao-Kang Wei)

指導教授 ： 陳厚銘

國立虎尾科技大學/電機資訊學院/電機工程研究所/碩士(2013年)

https://doi.org/10.6827/NFU.2013.00071

摘要

本論文針對電子產品電源供應所需的直流轉直流升壓轉換驅動電路(Boost Converter)提出設計與實現，例如: 行車紀錄器、LED照明驅動…等可攜式產品。
本文直流轉直流升壓轉換器驅動電路，採用電流模式脈波頻率調變技術(Pulse
Frequency Modulation,PFM)來實現控制迴路，此直流轉直流升壓轉換器電路內包含了遲滯比較器(hysteresis comparator)、電流感測電路(current sensor)、截止時間控制電路(off-time generator)、誤差放大器(error amplifier)、閘級驅動電路(buffer)、參考電壓0.7V的帶差參考電路(bandgap refences)、數位邏輯控制電路及取代傳統整流二極體的金氧半場效電晶體(Mp)，而轉換效率對於直流轉直流轉換器是很重要的，所以本文提出了兩種改善方式:防止電感電流下降至零以下的改善電路、針對隨著負載電流的改變進而調整電感電流的峰值，來提升直流轉直流升壓轉換器之轉換效率，模擬結果顯示轉換效率在負載電流5mA達至88.3%。
其輸入電壓為1.8V、輸出電壓為3.5V，此直流轉直流升壓轉換器晶片是使用台積電 0.18μm 1P6M 1.8V/3.3V CMOS製程來實現，面積大小為1.152×1.1657mm2。

關鍵字

直流轉直流升壓轉換驅動電路 ； 脈波頻率調變技術 ； 零電流偵測

並列摘要

The paper is directed against the DC to DC boost converter which the power supply system needs. It brings up the design and practice it, such as the event data recorder, LED lighten drive, portable device and so on.
The DC to DC boost converter in this article uses Pulse-Frequency Modulation(PFM) to practice controlling circuit. The DC to DC boost converter includes Hysteresis Comparator, Current Sensor, Off-Time Generator, Error Amplifier, Buffer, 0.7V Bandgap References, digital logic control circuit, and the MOSFET which replaces the traditional diode. The input voltage is 1.8V, and converting efficiency is very important to the DC to DC converter; therefore, in the paper, we propose two ways to reform:The modify circuit which can protect inductor current not to descent below 0, For increasing the converting efficiency of DC to DC boost converter, the peak value of the inductor current we be adjusted through the load current’s change. The post simulation results show that power conversion efficiency is achieve 88.3% for 5mA load current.
The output voltage is 3.5V. To manufacture this process, I use TSMC 0.18μm 1P6M 1.8V/3.3V CMOS technology as its DC to DC boost converter chip, and its measure is 1.152×1.1657mm2.

並列關鍵字

DC to DC Boost Converter ； Pulse-Frequency Modulation ； Zero current detector

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