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<section> <article> <h1>電壓雙象限BuckBoost電路拓?fù)浼胺治?/h1> <div id="yqii4qu" class="authorTimeSource"> <span>作者：</span> <span>時(shí)間：2011-03-22</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="so4sqig" 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(shí)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="amgq448" 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="88uwaki" class="content" id="contentDiv" style="position:relative;"> <div id="2w8s828" 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;"><p><font face="Verdana">0 引言 </font></p>本文引用地址：<a href="http://www.ex-cimer.com/article/179357.htm">http://www.ex-cimer.com/article/179357.htm</a><p><font face="Verdana"> 在直流變換中不產(chǎn)生電能形式變化，只產(chǎn)生直流電參數(shù)的變化。DC/DC變換器具有成本低、重量輕、可靠性高、結(jié)構(gòu)簡單等特點(diǎn)，因此，在工業(yè)領(lǐng)域和實(shí)驗(yàn)室得到了廣泛應(yīng)用。單<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/象限"><em>象限</em></a>直流<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電壓"><em>電壓</em></a>變換器<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電路"><em>電路</em></a>的特點(diǎn)是輸出<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電壓"><em>電壓</em></a>平均值Uo跟隨占空比D值而變，但不管D為何值，Uo的極性則始終不變，這對于直流開關(guān)穩(wěn)壓電源一類的應(yīng)用場所是能夠滿足要求的。但對于直流調(diào)速電源，負(fù)載為直流電動機(jī)時(shí)，上述性能便不能滿足要求，因而發(fā)展了多<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/象限"><em>象限</em></a>直流<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電壓"><em>電壓</em></a>變換<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電路"><em>電路</em></a>。 </font></p><p><font face="Verdana"> 雙<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/象限"><em>象限</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電路"><em>電路</em></a>分為輸出電流平均值Io極性可變的電路與輸出電壓平均值Uo極性可變的電路兩類，通常前一種電路稱為電流雙象限電路，后一種電路稱為電壓雙象限電路。電流雙象限電路是指輸出電流平均值Io的幅值和極性均隨控制信號us而變化，但輸出電壓平均值Uo的極性卻始終為正，即電路可運(yùn)行于第一和第二象限。電壓雙象限電路是指輸出電壓平均值Uo的幅值和極性均隨控制信號us而變化，但輸出電流平均值Io卻始終為正，即電路可運(yùn)行于第一和第四象限。本文將對電壓雙象限<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/Buck"><em>Buck</em></a>-<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/Boost"><em>Boost</em></a>電路進(jìn)行<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/分析"><em>分析</em></a>。 </font></p><p><font face="Verdana">1 <a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/Buck"><em>Buck</em></a>電路 </font></p><p><font face="Verdana">1.1 電路結(jié)構(gòu) </font></p><p><font face="Verdana"> 主電路如圖1所示。用電感、內(nèi)阻和等效電壓串聯(lián)電路表示有源負(fù)載，橋的直流輸入端并聯(lián)濾波電容。這是一個(gè)全橋電路結(jié)構(gòu)，橋的每臂用全控型器件（S1，S2）和不控型器件（D1，D2）組成。S1及S2的控制采用PWM控制，這樣可以調(diào)節(jié)D值，并且及時(shí)檢測負(fù)載的運(yùn)行狀況，由此控制開關(guān)的關(guān)斷和開通。此電路的元器件、電源、負(fù)載均假設(shè)為理想的。輸出濾波電感足夠大，可保證負(fù)載電流連續(xù)，且線性升降。 </font></p><p><font face="Verdana">1.2 工作原理 </font></p><p><font face="Verdana">1.2.1 運(yùn)行于第一象限 </font></p><p><font face="Verdana">這是指輸出端電壓平均值和電流平均值均為正的工作狀態(tài)。 </font></p><p><font face="Verdana">（0≤t≤DT） S1及S2均導(dǎo)通，等效電路如圖2(a)所示，輸出電壓Uo為Ud，輸入電流等于輸出電流，輸出電流線性增長，負(fù)載從電源吸取能量。 </font></p><p><font face="Verdana">(DT≤t≤T) S1導(dǎo)通，S2斷開，D1正偏續(xù)流，等效電路如圖2(b)所示，由于S1與D1導(dǎo)通，Uo的值為零。 </font></p><p><font face="Verdana"><p><br />(a) 0≤t≤DT</p><p>(b) DT≤t≤T</p><p><br />輸出電壓平均值為Uo=DUd</p><p>1.2.2 運(yùn)行于第四象限</p><p> 這是指輸出端電壓平均值為負(fù)而電流平均值為正的工作狀態(tài)。當(dāng)電路負(fù)載為電動機(jī)且驅(qū)動位能性負(fù)載，如卷揚(yáng)機(jī)的提升機(jī)構(gòu)，當(dāng)放下重物時(shí)，電機(jī)在重物作用下反轉(zhuǎn)，電樞感應(yīng)電勢反向，電磁轉(zhuǎn)矩成為制動轉(zhuǎn)矩，為了保證安全，必須改變控制信號的極性和幅值，使電路工作于第四象限，將位能經(jīng)過變換電路反饋到直流電源。具體工作過程如下。</p><p> (DT≤t≤T) S1及S2均斷開，電感端電壓反向，D1，D2正偏導(dǎo)通，等效電路如圖3(a)所示，輸出電壓Uo為－Ud，負(fù)載反饋能量。</p><p> （0≤t≤DT） S1斷開，S2導(dǎo)通，負(fù)載電流由D2換到S2中。等效電路如圖3(b)所示，Uo的值為零。</p><p> 輸出電壓平均值為Uo=－DUd</p><p><br /> 由以上<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/分析"><em>分析</em></a>可知此電路及其控制策略可以實(shí)現(xiàn)雙象限<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/Buck"><em>Buck</em></a>電路功能。</p><p>2 <a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/Boost"><em>Boost</em></a>電路</p><p>2.1 電路結(jié)構(gòu)</p><p> 主電路如圖4所示。圖中S1，S2，S3為全控型器件，D1及D2為不控型器件。負(fù)載依然為有源負(fù)載，直流輸入端串聯(lián)電感。S1，S2，S3的控制采用PWM控制，此電路的元器件、電源、負(fù)載同樣假設(shè)為理想的。輸出濾波電感足夠大，可保證負(fù)載電流連續(xù)，且線性升降?？梢钥闯觯倦娐返脑O(shè)計(jì)思想也是利用全橋?qū)崿F(xiàn)雙象限運(yùn)行，其好處在于簡單、可靠。</p><p><br />2.2 工作原理</p><p>2.2.1 運(yùn)行于第一象限</p><p> (DT≤t≤T) S1斷開，S2及S3均導(dǎo)通，等效電路如圖5(a)所示，電感電壓UL=Ud－Uo。</p><p> （0≤t≤DT） S1，S2，S3均導(dǎo)通，等效電路如圖5(b)所示，電感電壓UL=Ud。</p><p>輸出電壓平均值為Uo=Ud/（1－D）</p><p><br />2.2.2 運(yùn)行于第四象限</p><p> (DT≤t≤T) S1，S2，S3均斷開，電感端電壓反向，D1及D2正偏導(dǎo)通，等效電路如圖6(a)所示，電感電壓UL=Ud＋Uo。</p><p> （0≤t≤DT） S1導(dǎo)通，S2及S3均斷開，等效電路如圖6(b)所示，電感電壓UL=Ud。</p><p> 輸出電壓平均值為Uo=－Ud/（1－D）</p><p><br />3 Buck-<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/Boost"><em>Boost</em></a>電路</p><p>3.1 電路結(jié)構(gòu)</p><p> 主電路如圖7所示。圖中S0，S1，S2，S3，S4為全控型器件。負(fù)載依然為有源負(fù)載，直流輸入端并聯(lián)電感Lo。所有開關(guān)均采用PWM控制，此電路的元器件、電源、負(fù)載同樣假設(shè)為理想的。輸出濾波電感足夠大，可保證負(fù)載電流連續(xù)，且線性升降。此電路與雙象限Boost電路不同之處是主開關(guān)與電感相互交換位置。也是利用單象限Buck-Boost電路的主電路衍生出來的，并利用全橋全控電路實(shí)現(xiàn)雙象限功能。改變占空比D可以實(shí)現(xiàn)升壓或降壓功能。</p><p>3.2 工作原理</p><p>3.2.1 運(yùn)行于第一象限</p><p> （0≤t≤DT） S0，S1，S2均導(dǎo)通，S3及S4斷開，等效電路如圖8(a)所示，電感電壓UL=Ud。</p><p> (DT≤t≤T) S0，S1及S3斷開，S2及S4導(dǎo)通，等效電路如圖8(b)所示，電感電壓UL=－Uo。</p><p>3.2.2 運(yùn)行于第四象限</p><p> (DT≤t≤T) S0，S2，S4斷開，S1及S3導(dǎo)通，電感端電壓反向，等效電路如圖9(a)所示，電感電壓UL=Uo。</p><p> （0≤t≤DT） S0，S3，S4導(dǎo)通，S1及S2斷開，等效電路如圖9(b)所示，電感電壓UL=Ud。</p><p> 輸出電壓平均值為Uo=－DUd/（1－D）</p><p>4 結(jié)語</p><p> 本文在傳統(tǒng)的單象限Buck、Boost、 Buck-Boost電路的基礎(chǔ)上衍生了雙象限的Buck、Boost、 Buck-Boost電路，并且<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/分析"><em>分析</em></a>了其具體的工作過程。本文的分析為雙象限電路及直流變換電路的研究提供了新的思路。</p></font></p><p></p></span>  <div class="yw4iai4" id="coverDiv" class="article_reg" 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