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href="http://www.ex-cimer.com" target="_blank">EEPW首頁(yè)</a> > <a href="/info/industry/special/power">電源與新能源</a> > <a href="/info/articlelist/special/power/type/5">設(shè)計(jì)應(yīng)用</a> > 如何把電源的功率限制變?yōu)殡娏飨拗?/p> </div> </div> </div>   <script src="https://forum.eepw.com.cn/jscontent/wenzilian" type="text/javascript"></script>  <div class="bectvje" id="container"> <section> <article> <h1>如何把電源的功率限制變?yōu)殡娏飨拗?/h1> <div id="asjxdcb" class="authorTimeSource"> <span>作者：</span> <span>時(shí)間：2012-03-14</span> <span>來(lái)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="qqwypoy" 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(chē)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(chē)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="llgxonx" 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="jyaofto" class="content" id="contentDiv" style="position:relative;"> <div id="ahnmonx" 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(gè)重要功能。幾乎所有應(yīng)用都要求使用過(guò)載保護(hù)。對(duì)于峰值<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電流"><em>電流</em></a>模式控制器而言，可以通過(guò)<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/限制"><em>限制</em></a>最大峰值<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電流"><em>電流</em></a>來(lái)輕松實(shí)現(xiàn)這個(gè)功能。在非連續(xù)反向結(jié)構(gòu)中，為峰值<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電流"><em>電流</em></a>設(shè)置<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/限制"><em>限制</em></a>可最終<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/限制"><em>限制</em></a><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<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/功率"><em>功率</em></a>。但是，限制輸入<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/功率"><em>功率</em></a>不會(huì)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(guò)載故障時(shí)輸入<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/功率"><em>功率</em></a>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(shí)，這會(huì)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(gè)額外組件，為您介紹<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/如何"><em>如何</em></a>對(duì)一個(gè)簡(jiǎn)單的峰值電流限制進(jìn)行改進(jìn)，將電源<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/變?yōu)?><em>變?yōu)?/em></a>一個(gè)恒定電流源，而非一個(gè)恒定功率源。</p>本文引用地址：<a href="http://www.ex-cimer.com/article/177747.htm">http://www.ex-cimer.com/article/177747.htm</a><p>圖1對(duì)比了理想輸出電壓與恒定功率和恒定電流限制的電流。這兩種情況下，過(guò)載故障保護(hù)都在120%最大額定負(fù)載時(shí)起作用。在一個(gè)使用功率限制的系統(tǒng)中，輸出電流隨負(fù)載增加電壓反向而增加。在現(xiàn)實(shí)系統(tǒng)中，有功率限制的反向控制器會(huì)在某個(gè)點(diǎn)關(guān)閉，原因是控制器的偏壓損耗。相比之下，一旦超出過(guò)載閾值，有電流限制的系統(tǒng)便會(huì)立刻關(guān)閉。可以通過(guò)直接檢測(cè)隔離邊界二次側(cè)的負(fù)載電流，實(shí)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(huì)高得離譜。</p><p><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" alt="Figure 1.jpg" width="388" height="296" src="http://editerupload.eepw.com.cn/fetch/20131009/177747_1_0.jpg" /></p><p>圖 1 理想功率限制產(chǎn)生強(qiáng)電流，觸發(fā)故障保護(hù)。</p><p>圖2顯示了移動(dòng)設(shè)備充電器所使用的一個(gè)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，擁有功率限制功能。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(jì)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" alt="方程式 1.jpg" width="214" height="37" src="http://editerupload.eepw.com.cn/fetch/20131009/177747_1_1.jpg" />方程式 1</p><p>由于變壓器電感（L）和開(kāi)關(guān)頻率（f）均固定不變，因此可以通過(guò)控制峰值一次電流（IPK）對(duì)輸出電壓（VOUT）進(jìn)行調(diào)節(jié)。隨著輸出電流（IOUT）增加，電壓開(kāi)始下降，但是反饋環(huán)路要求更高的峰值電流來(lái)維持電壓調(diào)節(jié)。<br /><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" alt="Figure 2.jpg" width="341" height="225" src="http://editerupload.eepw.com.cn/fetch/20131009/177747_1_2.jpg" /></p><p>圖 2 這種5V/5W反向通過(guò)限制峰值變壓器電流實(shí)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(guò)R15檢測(cè)該峰值電流，并使用R13和C12對(duì)其進(jìn)行濾波。如果電流檢測(cè)電壓達(dá)到過(guò)1V，則單獨(dú)過(guò)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(guò)程一樣。如果功率保持恒定不變，則可以將方程式1改寫(xiě)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(shí)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" alt="方程式2.jpg" width="153" height="59" src="http://editerupload.eepw.com.cn/fetch/20131009/177747_1_3.jpg" />方程式2</p><p>一些控制器還包含有一個(gè)第二級(jí)比較器。峰值電流高出第一級(jí)比較器時(shí)，第二級(jí)比較器跳閘斷開(kāi)。這種第二級(jí)比較器觸發(fā)控制器完全關(guān)閉，并發(fā)起一個(gè)重啟周期。設(shè)計(jì)這種額外保護(hù)級(jí)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(huì)超出該閾值。</span>  <div class="mxdflku" id="coverDiv" class="article_reg" style="width:100%;overflow:hidden;display:none;z-index:10;position:absolute;left:0;background:#fff;"> <center> <img 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