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<h1>低壓大電流DC/DC變換器拓?fù)浞治?/h1> <div id="hrvxjjz" class="authorTimeSource"> <span>作者：</span> <span>時間：2013-08-11</span> <span>來源：網(wǎng)絡(luò)</span> <link rel="stylesheet" type="text/css"/> <span style="float:right; width:150px;margin-right:0px; text-align:right;"> <div id="vvxbddj" class="nav0"> <ul> <li style="width:150px;"><a href="javascript:void(0);"><img src="http://www.ex-cimer.com/event/action/images/icon_add_4.png" width="20" border="0" align="absmiddle" />英飛凌汽車電子生態(tài)圈</a> <ul> <li style="width:150px;text-align:center;"><img src="http://www.ex-cimer.com/event/company/images/code_2.jpg" width="150"><br />掃碼關(guān)注<br />獲取最新最全汽車電子<br />技術(shù)方案與實用技巧</li> </ul> </li> </ul> </div> </span> <span style="float:right; width:30px;margin-right:0px; text-align:right;"><a rel="nofollow">收藏</a></span> </div> <div id="nnbvfvl" class="hAd4_Afinal20a_back">  <iframe id='a890e388' name='a890e388' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='660' height='60'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE&n=a635e61e' border='0' alt='' /></a></iframe> </div> <div style="margin-top:28px;"></div> <div id="dlfbvlj" class="content" id="contentDiv" style="position:relative;"> <div id="xpjvhnd" class="ad_300x180_Afinal13_back">  <iframe id='a225770a' name='a225770a' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='300' height='200'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE&n=a576c0a2' border='0' alt='' /></a></iframe> </div> <span id="contentlabels" style="font-size:14px;"><span id="pbtprhp" class=Apple-style-span style="WORD-SPACING: 0px; FONT: 14px/30px 宋體; TEXT-TRANSFORM: none; COLOR: rgb(17,17,17); TEXT-INDENT: 0px; WHITE-SPACE: normal; LETTER-SPACING: normal; BACKGROUND-COLOR: rgb(255,255,255); TEXT-ALIGN: left; orphans: 2; widows: 2; webkit-text-decorations-in-effect: none; webkit-text-size-adjust: auto; webkit-text-stroke-width: 0px"><P style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 15px; MARGIN: 0px; PADDING-TOP: 0px; BORDER-RIGHT-WIDTH: 0px"><FONT face=Verdana>摘要：目前對<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/低壓大電流"><em>低壓大電流</em></a>DC/ DC 變換器的研究方興未艾。如何選擇合適的拓?fù)潆娐肥瞧涫滓蝿?wù)。從拓?fù)洹?yīng)用方面系統(tǒng)地論述了<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/低壓大電流"><em>低壓大電流</em></a>技術(shù)近期的發(fā)展，闡述了各種拓?fù)潆娐返奶攸c及用途并進行了分析比較。同時，詳細(xì)地介紹了其關(guān)鍵的同步整流技術(shù)及其各種驅(qū)動方法。</FONT></P><P style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 15px; MARGIN: 0px; PADDING-TOP: 0px; BORDER-RIGHT-WIDTH: 0px"><FONT face=Verdana>　　<STRONG><FONT size=3>1 引言</FONT></STRONG></FONT></P><P style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 15px; MARGIN: 0px; PADDING-TOP: 0px; BORDER-RIGHT-WIDTH: 0px"><FONT face=Verdana>　　隨著電子技術(shù)的迅速發(fā)展，以及各種微處理器、IC 芯片和數(shù)字信號處理器的普及應(yīng)用，對<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/低壓大電流"><em>低壓大電流</em></a>輸出的低壓變換器的研究與應(yīng)用成為日益重要的課題。在低電壓輸出的情況下，一般的二極管整流很難達(dá)到較高效率，需采用同步整流技術(shù)，這就使得同步整流成為低壓大電流技術(shù)中的關(guān)鍵技術(shù)。另外，如何選擇合適的拓?fù)?，使變換器的性能最優(yōu)化，也是一個極其重要的問題。</FONT></P><P style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 15px; MARGIN: 0px; PADDING-TOP: 0px; BORDER-RIGHT-WIDTH: 0px"><FONT face=Verdana>　　首先分別從變壓器的初級和次級對各種基本拓?fù)溥M行分析比較，分別得出初級和次級適合于低壓大電流的優(yōu)化拓?fù)?，然后進行組合，列舉了3 種典型的拓?fù)洌詈髮?yōu)化的組合作進一步的比較分析。</FONT></P><P style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 15px; MARGIN: 0px; PADDING-TOP: 0px; BORDER-RIGHT-WIDTH: 0px"><FONT face=Verdana>　　<STRONG><FONT size=3>2 基本拓?fù)浼捌鋬?yōu)缺點分析</FONT></STRONG></FONT></P><P style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 15px; MARGIN: 0px; PADDING-TOP: 0px; BORDER-RIGHT-WIDTH: 0px"><FONT face=Verdana>　　以變壓器為界，此類變換器的初級拓?fù)淇蓮钠渌軅魉偷墓β室约巴負(fù)浣Y(jié)構(gòu)的復(fù)雜程度等方面進行分析。在提高低壓大電流變換器的效率中顯得尤為重要的是其次級的拓?fù)?。本文首先從提高效率的角度對其進行分析，然后綜合考慮其結(jié)構(gòu)復(fù)雜性和驅(qū)動方式等的問題。</FONT></P><P style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 15px; MARGIN: 0px; PADDING-TOP: 0px; BORDER-RIGHT-WIDTH: 0px"><FONT face=Verdana>　　<STRONG>2. 1 變壓器初級拓?fù)涞膬?yōu)選</STRONG></FONT></P><P style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 15px; MARGIN: 0px; PADDING-TOP: 0px; BORDER-RIGHT-WIDTH: 0px"><FONT face=Verdana>　　相對于升壓型變換器來說，降壓型變換器更加適用于低壓大電流變換器。其變壓器初級的基本拓?fù)渲饕捎谜な?、反激式、推挽式、半橋式和全橋式? 種。但是，其中的反激式變換器顯然不適合低壓大電流的要求，因為它的輸出紋波較大，變壓器漏感引起較大的電壓尖峰，功率不大（150W 以下） ,變換器效率不高，因而只能在電壓和負(fù)載調(diào)整率要求不高的場合使用。</FONT></P><P style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 15px; MARGIN: 0px; PADDING-TOP: 0px; BORDER-RIGHT-WIDTH: 0px"><FONT face=Verdana>　　<STRONG>2. 2 變壓器次級拓?fù)涞膬?yōu)選</STRONG></FONT></P><P style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 15px; MARGIN: 0px; PADDING-TOP: 0px; BORDER-RIGHT-WIDTH: 0px"><FONT face=Verdana>　　2. 2. 1 同步整流技術(shù)基本原理</FONT></P><P style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 15px; MARGIN: 0px; PADDING-TOP: 0px; BORDER-RIGHT-WIDTH: 0px"><FONT face=Verdana>　　同步整流技術(shù)旨在實現(xiàn)同步整流管柵極和源極之間的驅(qū)動信號與同步整流管漏極和源極之間開關(guān)同步。理想的同步整流技術(shù)可使同步整流管起到和整流二極管同樣的作用，即正向電壓導(dǎo)通，反向電壓關(guān)斷。在輸出為低電壓大電流的情況下，整流二極管的使用會引起很大的能量損耗，大大地降低電源效率。而用于同步整流的低電壓功率MOSFET 導(dǎo)通電阻非常小，正向?qū)▔航岛艿?，例?5A 時只有0. 1V ,因此用低電壓功率MOSFET 代替整流二極管勢在必行。</FONT></P><P style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 15px; MARGIN: 0px; PADDING-TOP: 0px; BORDER-RIGHT-WIDTH: 0px"><FONT face=Verdana>　　2. 2. 2 變壓器次級3 種結(jié)構(gòu)的比較</FONT></P><P style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 15px; MARGIN: 0px; PADDING-TOP: 0px; BORDER-RIGHT-WIDTH: 0px"><FONT face=Verdana>　　適用于低壓大電流輸出的變壓器次級結(jié)構(gòu)有3種：正激式結(jié)構(gòu)、中心抽頭式結(jié)構(gòu)和倍流整流式結(jié)構(gòu)（拓?fù)浼捌洳ㄐ稳鐖D1 、2 、3 所示）。</FONT></P><P style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 15px; MARGIN: 0px; PADDING-TOP: 0px; BORDER-RIGHT-WIDTH: 0px" align=center><FONT face=Verdana><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; DISPLAY: block; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 0px; MARGIN: 20px auto; PADDING-TOP: 0px; BORDER-RIGHT-WIDTH: 0px; max-width: 600px" alt="低壓大電流DC/DC變換器拓?fù)浞治?" src="http://editerupload.eepw.com.cn/fetch/20140213/228365_1_0.jpg" border=0></FONT></P><P style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 15px; MARGIN: 0px; PADDING-TOP: 0px; BORDER-RIGHT-WIDTH: 0px" align=center><FONT face=Verdana>圖1 正激式結(jié)構(gòu)與波形圖</FONT></P><P style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 15px; MARGIN: 0px; PADDING-TOP: 0px; BORDER-RIGHT-WIDTH: 0px" align=center><FONT face=Verdana><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; DISPLAY: block; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 0px; MARGIN: 20px auto; PADDING-TOP: 0px; BORDER-RIGHT-WIDTH: 0px; max-width: 600px" alt="低壓大電流DC/DC變換器拓?fù)浞治?" src="http://editerupload.eepw.com.cn/fetch/20140213/228365_1_1.jpg" border=0></FONT></P><P style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 15px; MARGIN: 0px; PADDING-TOP: 0px; BORDER-RIGHT-WIDTH: 0px" align=center><FONT face=Verdana>圖2 中心抽頭式結(jié)構(gòu)與波形圖</FONT></P><P style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 15px; MARGIN: 0px; PADDING-TOP: 0px; BORDER-RIGHT-WIDTH: 0px" align=center><FONT face=Verdana><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; DISPLAY: block; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 0px; MARGIN: 20px auto; PADDING-TOP: 0px; BORDER-RIGHT-WIDTH: 0px; max-width: 600px" alt="低壓大電流DC/DC變換器拓?fù)浞治?" src="http://editerupload.eepw.com.cn/fetch/20140213/228365_1_2.jpg" border=0></FONT></P><P style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 15px; MARGIN: 0px; PADDING-TOP: 0px; BORDER-RIGHT-WIDTH: 0px" align=center><FONT face=Verdana>圖3 倍流整流式結(jié)構(gòu)與波形圖</FONT></P><span id="tdvzbrz" class=Apple-style-span style="WORD-SPACING: 0px; FONT: 14px/30px 宋體; TEXT-TRANSFORM: none; COLOR: rgb(17,17,17); TEXT-INDENT: 0px; WHITE-SPACE: normal; LETTER-SPACING: normal; BACKGROUND-COLOR: rgb(255,255,255); TEXT-ALIGN: left; orphans: 2; widows: 2; webkit-text-decorations-in-effect: none; webkit-text-size-adjust: auto; webkit-text-stroke-width: 0px"><P style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 15px; MARGIN: 0px; PADDING-TOP: 0px; BORDER-RIGHT-WIDTH: 0px"><FONT face=Verdana>正激式結(jié)構(gòu)相對于其它兩者結(jié)構(gòu)最簡單，而且適用于低壓大電流的情況。與源于Buck 變換器的正激變換器類似，中心抽頭式結(jié) </span>  <div class="vnzdffv" id="coverDiv" class="article_reg" style="width:100%;overflow:hidden;display:none;z-index:10;position:absolute;left:0;background:#fff;"> <center> <img src="https://webstorage.eepw.com.cn/images/display/reg.jpg" border="0" usemap="#Map" /> <map name="Map" id="Map"> <area shape="rect" coords="133,235,319,253" target="_blank" /> <area shape="rect" coords="132,315,319,335" /> </map> </center> </div>  <span id="tlnhljr" class="hAd8"> <br></span>  <div id="rbxzdjp" 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href="http://www.ex-cimer.com/tech/s/k/MSP430" title="MSP430" target="_blank">MSP430</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/Multisim" title="Multisim" target="_blank">Multisim</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/濾波器" title="濾波器" target="_blank">濾波器</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/CAN總線" title="CAN總線" target="_blank">CAN總線</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/開關(guān)電源" title="開關(guān)電源" target="_blank">開關(guān)電源</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/單片機" title="單片機" target="_blank">單片機</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/PCB" title="PCB" target="_blank">PCB</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/USB" title="USB" target="_blank">USB</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/ARM" title="ARM" target="_blank">ARM</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/CPLD" title="CPLD" target="_blank">CPLD</a></li> <li><a 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target="_blank">Verilog</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/穩(wěn)壓電源" title="穩(wěn)壓電源" target="_blank">穩(wěn)壓電源</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/RAM" title="RAM" target="_blank">RAM</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/AVR" title="AVR" target="_blank">AVR</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/傳感器" title="傳感器" target="_blank">傳感器</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/可控硅" title="可控硅" target="_blank">可控硅</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/IGBT" title="IGBT" target="_blank">IGBT</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/嵌入式開發(fā)" title="嵌入式開發(fā)" target="_blank">嵌入式開發(fā)</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/逆變器" title="逆變器" target="_blank">逆變器</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/Quartus" title="Quartus" target="_blank">Quartus</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/RS-232" title="RS-232" target="_blank">RS-232</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/Cyclone" title="Cyclone" target="_blank">Cyclone</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/電位器" title="電位器" target="_blank">電位器</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/電機控制" title="電機控制" target="_blank">電機控制</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/藍(lán)牙" title="藍(lán)牙" target="_blank">藍(lán)牙</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/PLC" title="PLC" target="_blank">PLC</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/PWM" title="PWM" target="_blank">PWM</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/汽車電子" title="汽車電子" target="_blank">汽車電子</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/轉(zhuǎn)換器" title="轉(zhuǎn)換器" target="_blank">轉(zhuǎn)換器</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/電源管理" title="電源管理" target="_blank">電源管理</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/信號放大器" title="信號放大器" 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