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<h1>故障保護(hù)：將電源的功率限制變?yōu)殡娏飨拗频耐?/h1> <div id="fhjdxxn" class="authorTimeSource"> <span>作者：</span> <span>時間：2012-03-20</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="prdfzpd" 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="dvprtbp" 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="zhlfjzp" class="content" id="contentDiv" style="position:relative;"> <div id="xfzlfnd" 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>　　故障保護(hù)是所有<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電源"><em>電源</em></a>控制器都有的一個重要功能。幾乎所有應(yīng)用都要求使用過載保護(hù)。對于峰值電流模式控制器而言，可以通過限制最大峰值電流來輕松實現(xiàn)這個功能。在非連續(xù)反向結(jié)構(gòu)中，為峰值電流設(shè)置限制可最終限制<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電源"><em>電源</em></a>從輸入源獲得的功率。但是，限制輸入功率不會限制<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電源"><em>電源</em></a>的輸出電流。如果出現(xiàn)過載故障時輸入功率保持不變，則隨著輸出電壓下降，輸出電流增加（P=V*I）。發(fā)生短路故障時，這會讓輸出整流器或者系統(tǒng)配電出現(xiàn)難以接受的高損耗。本文利用一些小小的創(chuàng)新和數(shù)個額外組件，為您介紹如何對一個簡單的峰值<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電流限制"><em>電流限制</em></a>進(jìn)行改進(jìn)，將電源變?yōu)橐粋€恒定電流源，而非一個恒定功率源。</P><P>　　圖1對比了理想輸出電壓與恒定功率和恒定<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電流限制"><em>電流限制</em></a>的電流。這兩種情況下，過載故障保護(hù)都在120%最大額定負(fù)載時起作用。在一個使用<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/功率限制"><em>功率限制</em></a>的系統(tǒng)中，輸出電流隨負(fù)載增加電壓反向而增加。在現(xiàn)實系統(tǒng)中，有<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/功率限制"><em>功率限制</em></a>的反向控制器會在某個點關(guān)閉，原因是控制器的偏壓損耗。相比之下，一旦超出過載閾值，有<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電流限制"><em>電流限制</em></a>的系統(tǒng)便會立刻關(guān)閉。可以通過直接檢測隔離邊界二次側(cè)的負(fù)載電流，實現(xiàn)電流限制。但是，這樣做需要使用更多的電路，效率降低，而且成本一般會高得離譜。</P><P>　　圖2顯示了移動設(shè)備充電器所使用的一個5V/5W非連續(xù)反向電源的原理圖。在范例中，我們使用了UCC28C44控制器，它是大多數(shù)經(jīng)濟(jì)型峰值電流模式控制器的代表，擁有<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/功率限制"><em>功率限制</em></a>功能。在非連續(xù)反向結(jié)構(gòu)中，如果忽略效率影響，可使用方程式1計算負(fù)載功率（P）的大小。</P><P>　　<img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" border=0 alt="故障保護(hù)：將電源的功率限制變?yōu)殡娏飨拗频耐?" src="http://editerupload.eepw.com.cn/fetch/20140213/230882_1_0.jpg" width=315 height=36></P><P>　　由于變壓器電感（L）和開關(guān)頻率（f）均固定不變，因此可以通過控制峰值一次電流（IPK）對輸出電壓（VOUT）進(jìn)行調(diào)節(jié)。隨著輸出電流（IOUT）增加，電壓開始下降，但是反饋環(huán)路要求更高的峰值電流來維持電壓調(diào)節(jié)。</P><P>　　<img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" border=0 alt=將電源的功率限制變?yōu)殡娏飨拗频耐緩剑娮庸こ虒］嫞?src="http://editerupload.eepw.com.cn/fetch/20140213/230882_1_1.jpg" width=600 height=396></P><P>　　圖2：這種5V/5W反向通過限制峰值變壓器電流實現(xiàn)功率限制。</P><P>　　在反向轉(zhuǎn)換器內(nèi)部，引腳1（COMP）的反饋電壓與峰值電流比較。通過R15檢測該峰值電流，并使用R13和C12對其進(jìn)行濾波。如果電流檢測電壓達(dá)到過1V，則單獨過電流比較器終止脈沖。這種峰值電流限制方法與大多數(shù)脈寬調(diào)制（PWM）控制器中的功率限制過程一樣。如果功率保持恒定不變，則可以將方程式1改寫為方程式2。在該方程式中，我們可以清楚地看到功率限制時輸出電流同輸出電壓成反比。</P><P>　　<img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" border=0 alt="故障保護(hù)：將電源的功率限制變?yōu)殡娏飨拗频耐?" src="http://editerupload.eepw.com.cn/fetch/20140213/230882_1_2.jpg" width=315 height=46></P><P>　　一些控制器還包含有一個第二級比較器。峰值電流高出第一級比較器時，第二級比較器跳閘斷開。這種第二級比較器觸發(fā)控制器完全關(guān)閉，并發(fā)起一個重啟周期。設(shè)計這種額外保護(hù)級的目的是防止電源本身發(fā)生災(zāi)難性故障，例如：短路變壓器繞組或者短路輸出二極管。但是，涉及短路負(fù)載的大多數(shù)情況一般都不會超出該閾值。</P><P>　　輸出V-I特性非常接近于圖1所示理想情況。負(fù)載電流達(dá)到約1.3A時開始功率限制。隨著負(fù)載增加，輸出電壓開始下降。由于偏置電壓是輸出電壓的反映，因此它也開始下降。偏置電壓降至9V關(guān)閉水平以下時，PWM控制器關(guān)閉。</P><P>　　在該例子中，盡管在負(fù)載超出1.3A時峰值電流限制激活，但是在轉(zhuǎn)換器關(guān)閉以前負(fù)載電流會為額定負(fù)載的兩倍以上。在某些應(yīng)用中，這是不可接受的。反之，一種更加方形的V-I曲線則較為理想。負(fù)載增加超出功率限制點后偏置電壓隨之下降，利用這一特性，我們可以非常輕松地獲得這種V-I曲線。只需增加數(shù)個組件，便可利用不斷降低的偏置電壓在功率限制期間折疊開關(guān)頻率。這樣做以后，開關(guān)頻率被強(qiáng)制與輸出電壓成正比關(guān)系，如方程式3所示。將方程式3代入方程式2后我們發(fā)現(xiàn)，理論上講功率限制期間輸出電流不再依賴于輸出電壓的大小，參見方程式4。</P><P>　　<img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" border=0 alt="故障保護(hù)：將電源的功率限制變?yōu)殡娏飨拗频耐?" src="http://editerupload.eepw.com.cn/fetch/20140213/230882_1_3.jpg" width=315 height=114></P><P>　　用于創(chuàng)建這種改進(jìn)型電流限制而增加的一些組件突出顯示在圖4所示原理圖中。對內(nèi)部振蕩器編程，通過R10、R8和C11設(shè)置反向轉(zhuǎn)換器的開關(guān)頻率。一個內(nèi)部5V源通過R10和R8對C11充電。隨著偏置電壓下降，R7和R11的電阻分壓器開啟Q1，并優(yōu)先于內(nèi)部5V源進(jìn)行控制，從而降低開關(guān)頻率。偏置二極管（D4）現(xiàn)在必須為一種雙串聯(lián)二極管，這樣R7和R11才不會在啟動期間使控制器的電流改道。需正確選擇R7和R11的值，以便讓Q1在正常運行期間處于關(guān)閉狀態(tài)，僅在偏置電壓降至約12V以下時才開啟。</P><P>　　<img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" border=0 alt=將電源的功率限制變?yōu)殡娏飨拗频耐緩剑娮庸こ虒］嫞?src="http://editerupload.eepw.com.cn/fetch/20140213/230882_1_4.jpg" width=600 height=395></P><P>　　圖4：增加5個離散式組件可增強(qiáng)功率限制功能并降低最大故障電流。</P><P>　　添加這些組件的結(jié)果如圖5所示。同前面一樣，電源進(jìn)入功率限制時輸出電壓和偏置電壓均開始下降。一旦偏置電壓降至足以開啟Q1的程度，負(fù)載電流的任何繼續(xù)增加都會使開關(guān)頻率降低，其反過來又會降低供給負(fù)載的有效功率。這會加快過電流關(guān)閉過程。注意，在輸出電流和輸出電壓之間仍然存在一定程度的相互關(guān)系，這是因為變壓器內(nèi)部的偏置繞組耦合和有限的Q1增益。盡管存在這些缺點，但是增加的電路還是極大地改善了V-I特性。實際上，電源現(xiàn)在不會向故障負(fù)載提供1.5A以上的電流。</P><P>　　總之，擁有功率限制保護(hù)的電源仍然可以為過載輸出提供大量的電流。如本文所述，只需在一次側(cè)控制器周圍添加少數(shù)幾個組件，便可輕松且低成本地實現(xiàn)精確的電流限制功能。盡管它針對的反向轉(zhuǎn)換器，但是這種方案也可以減少降壓轉(zhuǎn)換器的多余電流。</P> </span>  <div class="pbvpdtr" 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="hhbnfxv" class="hAd8"> <br></span>   </div> </article> 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