高增益轉換比之切換式電容升/降壓型直流轉換器的設計與實作

Design and Implementation of High-Conversion-Ratio Switched-Capacitor Step-Up/Down DC-DC Converter

李晨瑋(Chen-Wei Lee)

指導教授 ： 張原豪

朝陽科技大學/資訊學院/資訊工程系/碩士(2010年)

摘要

本論文提出一個閉迴路設計的高增益轉換比之切換式電容升/降壓型直流轉換器的設計與實作(Design and Implementation of High-Conversion-Ratio Switched-Capacitor Step-Up/Down DC-DC Converter)以脈波寬度調變方式進行升壓/降壓轉換和調節。在高增益轉換比之切換式電容，電源Vs和輸出電壓Vo間，總共有4個串-並聯切換式電容方塊，而每個方塊內都有著3顆電容。隨著電容週期性的並聯充電和串連放電/串聯充電和並聯放電，每個方塊將可以成為三個電壓增益的小型轉換器。藉由4個方塊的互補性工作，其主要的功能是去提升/降低Vs讓Vo電壓上升/下降到最多3x3倍。事實上，這個切換式電容轉換器不需要任何磁性元件，舉例來說像是電感/變壓器，所以在IC製程上將被有希望實現上VLSI應用上。此閉迴路高增益切換式電容使用OrCAD Spice來進行模擬，其中包含一些例子如下: 電壓轉換和輸出漣波百分比、輸出電壓對電源變動的抵抗能力和負載變動時轉換器的調節能力。

關鍵字

升/降壓 ； 脈波寬度調變 ； 高增益轉換比 ； 切換式電容

並列摘要

A closed-loop scheme of high-conversion-ratio switched-capacitor (HCRSC) converter is proposed based on pulse-width-modulation (PWM) control for step-up/down conversion and requlation. In the HCRSC, there are totally 4 sets of series-parallel SC cells between source Vs and output Vo, where each cell has 3 capacitors. With the capacitors charging in parallel and discharging in series/ charging in series and discharging in parallel cyclically, each cell will be a small converter of triple voltage gain. And by the 4 cells working complementarily, the main function is to boost/bulk Vo voltage up/down to 3x3 times of Vs at most. In addition, this SC converter needs no magnetic element, e.g. inductor/transformer, so I.C. fabrication will be promising for VLSI applications. Here, the closed-loop HCRSC is simulated by OrCAD Spice, and some cases are included as: voltage conversion and output ripple percentage, output robustness against source variation, and regulation capability of converter with loading variation.

並列關鍵字

High-conversion-ratio ； step-up/down ； pulse-width-modulation ； switched-capacitor

參考文獻

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