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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> > 如何選擇功率因數(shù)校正（PFC）拓?fù)洌?/p> </div> </div> </div>   <script src="https://forum.eepw.com.cn/jscontent/wenzilian" type="text/javascript"></script>  <div class="6661666" id="container"> <section> <article> <h1>如何選擇功率因數(shù)校正（PFC）拓?fù)洌?/h1> <div id="6666616" class="authorTimeSource"> <span>作者：</span> <span>時(shí)間：2013-12-30</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="6161161" 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="6116161" 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="6661666" class="content" id="contentDiv" style="position:relative;"> <div id="6661661" 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 style="margin: 0px; padding: 0px; word-wrap: break-word; text-indent: 2em; line-height: 24px; color: rgb(62, 62, 62); font-family: Tahoma, Arial, sans-serif; font-size: 14px; text-align: justify; "><strong>引言</strong></p>本文引用地址：<a href="http://www.ex-cimer.com/article/227150.htm">http://www.ex-cimer.com/article/227150.htm</a><p style="margin: 0px; padding: 0px; word-wrap: break-word; text-indent: 2em; line-height: 24px; color: rgb(62, 62, 62); font-family: Tahoma, Arial, sans-serif; font-size: 14px; text-align: justify; ">隨著減小諧波標(biāo)準(zhǔn)的廣泛應(yīng)用，更多的電源設(shè)計(jì)結(jié)合了<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/功率因數(shù)校正"><em>功率因數(shù)校正</em></a> (PFC) 功能。設(shè)計(jì)人員面對(duì)著實(shí)現(xiàn)適當(dāng)?shù)腜FC段，并同時(shí)滿足其它高效能標(biāo)準(zhǔn)的要求及客戶預(yù)期成本的艱巨任務(wù)。許多新型PFC<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/拓?fù)?><em>拓?fù)?/em></a>和元件選擇的涌現(xiàn)，有助設(shè)計(jì)人員優(yōu)化其特定應(yīng)用要求的設(shè)計(jì)。</p><p align="center" style="margin: 0px; padding: 0px; word-wrap: break-word; text-indent: 2em; line-height: 24px; color: rgb(62, 62, 62); font-family: Tahoma, Arial, sans-serif; font-size: 14px; "><span style="text-align: justify; text-indent: 2em; ">由于有源PFC設(shè)計(jì)可以讓設(shè)計(jì)人員以最少的精力滿足高效能規(guī)范的要求，因此在近年來(lái)取得了好的發(fā)展。通過(guò)簡(jiǎn)化主功率轉(zhuǎn)換段的設(shè)計(jì)和減少元件數(shù)目，包括用于通用操作的波段轉(zhuǎn)換開(kāi)關(guān)和若干占用電容，此設(shè)計(jì)也附帶了一些優(yōu)勢(shì)。</span></p><p style="margin: 0px; padding: 0px; word-wrap: break-word; text-indent: 2em; line-height: 24px; color: rgb(62, 62, 62); font-family: Tahoma, Arial, sans-serif; font-size: 14px; text-align: justify; "><strong><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/拓?fù)?><em>拓?fù)?/em></a>選擇</strong></p><p style="margin: 0px; padding: 0px; word-wrap: break-word; text-indent: 2em; line-height: 24px; color: rgb(62, 62, 62); font-family: Tahoma, Arial, sans-serif; font-size: 14px; text-align: justify; ">由于輸入端存在電感，升壓轉(zhuǎn)換器是提供達(dá)至高功率因數(shù)的方法。此電感使輸入電流整形與線路電壓同相。但是，可以采用不同的方案來(lái)控制電感電流的瞬時(shí)值，以獲得<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/功率因數(shù)校正"><em>功率因數(shù)校正</em></a>。圖1為這些方案的簡(jiǎn)要概述。</p><p align="center" style="margin: 0px; padding: 0px; word-wrap: break-word; text-indent: 2em; line-height: 24px; color: rgb(62, 62, 62); font-family: Tahoma, Arial, sans-serif; font-size: 14px; "><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" src="http://editerupload.eepw.com.cn/fetch/20140213/227150_1_0.jpg" width="500" style="border: none; vertical-align: middle; float: none; "></p><p align="center" style="margin: 0px; padding: 0px; word-wrap: break-word; text-indent: 2em; line-height: 24px; color: rgb(62, 62, 62); font-family: Tahoma, Arial, sans-serif; font-size: 14px; ">圖1 PFC工作模式概述</p><p style="margin: 0px; padding: 0px; word-wrap: break-word; text-indent: 2em; line-height: 24px; color: rgb(62, 62, 62); font-family: Tahoma, Arial, sans-serif; font-size: 14px; text-align: justify; ">a. 臨界導(dǎo)電模式 (CRM) PFC - 由于控制的設(shè)計(jì)較為簡(jiǎn)單，而且可與較低速升壓二極管配合使用，所以在較低功率應(yīng)用中通常采用這方法。近年來(lái)，此方法獲創(chuàng)新的改進(jìn)，提升了效率，MC33260 PFC 控制器提供跟隨升壓選項(xiàng)，通過(guò)使升壓轉(zhuǎn)換器的輸出電壓隨著線路電壓的變化而變化，降低了33%的 MOSFET 導(dǎo)電損耗，減小了43%的升壓電感尺寸。此外，專為CRM和DCM應(yīng)用而設(shè)計(jì)的升壓二極管可提供更佳的正向壓降(MUR450, MUR550)。然而，CRM PFC仍受到一些限制，如較難過(guò)濾的可變頻率和接近零交叉的高開(kāi)關(guān)頻率。<span style="text-indent: 2em; ">b. 不連續(xù)導(dǎo)電模式(DCM) PFC -此創(chuàng)新的方案延承了CRM的優(yōu)點(diǎn)，并消除了若干限制，安森美半導(dǎo)體的NCP1601 DCM/CRM控制器便是一例。此器件可完全在DCM中工作并保持恒頻，也可以部分在CRM模式中工作。在第二種情況下，峰值電流與CRM維持在同一水平，但最高頻率明顯降低，減輕了濾波負(fù)擔(dān)。降低開(kāi)關(guān)頻率的另一大優(yōu)點(diǎn)是有助降低輕載或空載功耗，以滿足各種高能效標(biāo)準(zhǔn)。NCP1601 [3] 具有專利控制架構(gòu)，通過(guò)模式轉(zhuǎn)換保持PFC，提供比其它方法更為卓越的性能。圖2顯示了NCP1601A在100 W中的應(yīng)用，這種方法簡(jiǎn)單且有效 - 110 Vac 和滿載時(shí)的功率因數(shù)超過(guò)0.99且效率高達(dá) 94%。</span></p><p align="center" style="margin: 0px; padding: 0px; word-wrap: break-word; text-indent: 2em; line-height: 24px; color: rgb(62, 62, 62); font-family: Tahoma, Arial, sans-serif; font-size: 14px; "><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" src="http://editerupload.eepw.com.cn/fetch/20140213/227150_1_1.jpg" width="500" style="border: none; vertical-align: middle; float: none; "></p><p align="center" style="margin: 0px; padding: 0px; word-wrap: break-word; text-indent: 2em; line-height: 24px; color: rgb(62, 62, 62); font-family: Tahoma, Arial, sans-serif; font-size: 14px; ">圖2 NCP1601A DCM PFC 控制器用于100 W 應(yīng)用圖3 NCP1653 CCM PFC 控制器用于300 W應(yīng)用</p><p style="margin: 0px; padding: 0px; word-wrap: break-word; text-indent: 2em; line-height: 24px; color: rgb(62, 62, 62); font-family: Tahoma, Arial, sans-serif; font-size: 14px; text-align: justify; ">c. 連續(xù)導(dǎo)電模式 (CCM) PFC - 由于這種方案恒頻且峰值電流較小，是較高功率 (>250 W) 應(yīng)用的首選方案。但是，傳統(tǒng)的控制解決方案較為復(fù)雜，牽涉到多個(gè)環(huán)路，以及以不精確著稱的模擬乘法器，并需在控制集成電路周圍放許多元件。隨著NCP1653(簡(jiǎn)單且穩(wěn)固的8引腳CCM PFC控制器)的推出，此方案得以簡(jiǎn)化。NCP1653并提供全套保護(hù)特性和跟隨升壓功能。如圖3所示，雖然NCP1653所需元件極少，但其性能卻并不比任何CCM 控制器遜色 (110 Vac, 300 W 時(shí)的THD為4 %，效率高達(dá)93%)。</p><p align="center" style="margin: 0px; padding: 0px; word-wrap: break-word; text-indent: 2em; line-height: 24px; color: rgb(62, 62, 62); font-family: Tahoma, Arial, sans-serif; font-size: 14px; "><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" src="http://editerupload.eepw.com.cn/fetch/20140213/227150_1_2.jpg" width="500" style="border: none; vertical-align: middle; float: none; "></p><p align="center" style="margin: 0px; padding: 0px; word-wrap: break-word; text-indent: 2em; line-height: 24px; color: rgb(62, 62, 62); font-family: Tahoma, Arial, sans-serif; font-size: 14px; ">圖3 NCP1653 CCM PFC 控制器用于300W 應(yīng)用<strong style="text-align: justify; text-indent: 2em; ">選擇標(biāo)準(zhǔn)</strong></p><p style="margin: 0px; padding: 0px; word-wrap: break-word; text-indent: 2em; line-height: 24px; color: rgb(62, 62, 62); font-family: Tahoma, Arial, sans-serif; font-size: 14px; text-align: justify; ">既然實(shí)行<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/功率因數(shù)校正"><em>功率因數(shù)校正</em></a>有多種新興方案可供選擇，那么應(yīng)該如何決定選擇哪種方案呢？以下是簡(jiǎn)要的指南，幫助設(shè)計(jì)人員選擇適合的方案。</p><p style="margin: 0px; padding: 0px; word-wrap: break-word; text-indent: 2em; line-height: 24px; color: rgb(62, 62, 62); font-family: Tahoma, Arial, sans-serif; font-size: 14px; text-align: justify; "><strong>1. 功率水平</strong></p><p style="margin: 0px; padding: 0px; word-wrap: break-word; text-indent: 2em; line-height: 24px; color: rgb(62, 62, 62); font-family: Tahoma, Arial, sans-serif; font-size: 14px; text-align: justify; ">a. 如果功率水平低于150 W，最好采用CRM或DCM方案。至於__CRM或DCM，取決于你是想優(yōu)化滿載效率(請(qǐng)采用CRM)；而如欲減少EMI問(wèn)題(請(qǐng)選擇DCM)。如上所述，NCP1601提供集兩種方案優(yōu)點(diǎn)于一身的極佳選擇方案。</p><p style="margin: 0px; padding: 0px; word-wrap: break-word; text-indent: 2em; line-height: 24px; color: rgb(62, 62, 62); font-family: Tahoma, Arial, sans-serif; font-size: 14px; text-align: justify; ">b. 如功率水平高于250 W，CCM是首選方案。此方案雖然可保持峰值電流和RMS電流，但必須解決二極管反向恢復(fù)問(wèn)題。</p><p style="margin: 0px; padding: 0px; word-wrap: break-word; text-indent: 2em; line-height: 24px; color: rgb(62, 62, 62); font-family: Tahoma, Arial, sans-serif; font-size: 14px; text-align: justify; ">c. 如功率水平在150 W與250 W之間，方案的選擇則取決于設(shè)計(jì)人員的磁件設(shè)計(jì)水平(CRM和DCM方案的升壓電感更具挑戰(zhàn)性)，但CCM方案雖然較為昂貴，但較有把握。隨著NCP1653的推出，成本問(wèn)題已獲解決。</p><p style="margin: 0px; padding: 0px; word-wrap: break-word; text-indent: 2em; line-height: 24px; color: rgb(62, 62, 62); font-family: Tahoma, Arial, sans-serif; font-size: 14px; text-align: justify; "><strong>2. 其它系統(tǒng)要求</strong></p><p style="margin: 0px; padding: 0px; word-wrap: break-word; text-indent: 2em; line-height: 24px; color: rgb(62, 62, 62); font-family: Tahoma, Arial, sans-serif; font-size: 14px; text-align: justify; "><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/拓?fù)?><em>拓?fù)?/em></a>的選擇還取決于其它系統(tǒng)要求。例如，如果需要使系統(tǒng)中的頻率同步，則不能采用CRM。此外，如果第二個(gè)功率段可處理較大范圍(在某些功率序列安排中可能需要)的輸入電壓，則應(yīng)選擇跟隨升壓。最后，如果電源的輸出電壓未有嚴(yán)格規(guī)定，則最好采用NCP1651提供的單段隔離PFC解決方案。</p><p style="margin: 0px; padding: 0px; word-wrap: break-word; text-indent: 2em; line-height: 24px; color: rgb(62, 62, 62); font-family: Tahoma, Arial, sans-serif; font-size: 14px; text-align: justify; "><strong>結(jié)語(yǔ)</strong></p><p style="margin: 0px; </span>  <div class="6116666" id="coverDiv" class="article_reg" 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