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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> > 抑制單級(jí)PFC中儲(chǔ)能電容電壓的拓?fù)溲芯?/p> </div> </div> </div>   <script src="https://forum.eepw.com.cn/jscontent/wenzilian" type="text/javascript"></script>  <div class="uttjcvh" id="container"> <section> <article> <h1>抑制單級(jí)PFC中儲(chǔ)能電容電壓的拓?fù)溲芯?/h1> <div id="viysiyd" class="authorTimeSource"> <span>作者：</span> <span>時(shí)間：2012-03-11</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="hunopuv" 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="gspfgaf" 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="qoifnom" class="content" id="contentDiv" style="position:relative;"> <div id="uohpmyd" 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="yzlbcsx" class="Apple-style-span" style="font-family: Arial, Helvetica, sans-serif; font-size: 14px; line-height: 24px; background-color: rgb(255, 255, 255); ">1　引言<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">　　為了減小對(duì)交流電網(wǎng)的諧波污染，國(guó)內(nèi)外制訂了有關(guān)標(biāo)準(zhǔn)（如IEC 1000-3-2標(biāo)準(zhǔn)）來(lái)限制電流諧波。因此，要求交流輸入電源必須采取措施降低電流諧波含量，提高功率因數(shù)。目前廣泛采用的有源<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>方法有兩種，即兩級(jí)PFC和<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/單級(jí)"><em>單級(jí)</em></a>PFC。兩級(jí)PFC [1]將PFC級(jí)輸出端與DC/DC變換器相串聯(lián)。由于采用兩級(jí)結(jié)構(gòu)，電路復(fù)雜，裝置費(fèi)用高，效率低。在小功率應(yīng)用場(chǎng)合，兩級(jí)PFC很不適用。因此，研究<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/單級(jí)"><em>單級(jí)</em></a>PFC及變換技術(shù)成為電力電子領(lǐng)域中的一項(xiàng)重要課題。<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">　　<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/單級(jí)"><em>單級(jí)</em></a>PFC[2－3]將PFC級(jí)和DC/DC級(jí)組合在一起共用一個(gè)開(kāi)關(guān)管和一套控制電路，同時(shí)實(shí)現(xiàn)對(duì)輸入電流的整形和對(duì)輸出電壓的調(diào)節(jié)。它與兩級(jí)方案不同的是，控制電路只調(diào)節(jié)輸出電壓，保證輸出電壓的穩(wěn)定，在穩(wěn)態(tài)時(shí)，占空比恒定，因此要求PFC級(jí)的電流能自動(dòng)跟隨輸入電壓，雖然單級(jí)PFC變換器的輸入電流不是正弦波，PF值不如兩級(jí)方案高，但由于IEC1000-3-2標(biāo)準(zhǔn)只對(duì)電流諧波含量有要求，對(duì)PF值沒(méi)有嚴(yán)格的要求，單級(jí)PFC變換器的輸入電流諧波足以滿足IEC1000-3-2標(biāo)準(zhǔn)。由于采用單級(jí)結(jié)構(gòu)，電路簡(jiǎn)單，成本低，功率密度高。因此，單級(jí)PFC變換器在小功率場(chǎng)合得到了廣泛的應(yīng)用。<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">　　本文主要對(duì)單級(jí)PFC的<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/拓?fù)?><em>拓?fù)?/em></a>進(jìn)行了分析，抑制儲(chǔ)能電容電壓是單級(jí)<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>要解決的主要問(wèn)題，儲(chǔ)能電容電壓隨輸入電壓和負(fù)載的變化而變化，在輸入高壓或輕載時(shí)，電容電壓可能達(dá)到上千伏，而且變換器的效率低。介紹了幾種改進(jìn)的<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/拓?fù)?><em>拓?fù)?/em></a>結(jié)構(gòu)來(lái)降低電容電壓，分別討論了其優(yōu)缺點(diǎn)。通過(guò)對(duì)現(xiàn)有<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/拓?fù)?><em>拓?fù)?/em></a>的分析，得出了一種新型拓?fù)浣Y(jié)構(gòu)。<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">2 單級(jí)<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>的主要問(wèn)題<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">　　單級(jí)PFC將PFC級(jí)和DC/DC級(jí)組合在一起共用一個(gè)開(kāi)關(guān)管和一套控制電路，同時(shí)實(shí)現(xiàn)對(duì)輸入電流的整形和對(duì)輸出電壓的調(diào)節(jié)。它與兩級(jí)方案不同的是，控制電路只調(diào)節(jié)輸出電壓，保證輸出電壓的穩(wěn)定。對(duì)PFC級(jí)輸出功率恒定時(shí)，輸入功率是一個(gè)周期性變化的量，所以儲(chǔ)能電容用來(lái)解決瞬時(shí)輸入功率和輸出功率不平衡問(wèn)題。眾所周知，電流斷續(xù)模式（DCM）的boost變換器在固定占空比下電流自動(dòng)跟隨輸入電壓，因此PFC級(jí)工作在DCM下可以得到較高的功率因數(shù)。而為了提高變換器的效率，DC/DC變換器一般工作在電流連續(xù)模式（CCM）下。在CCM情況下，當(dāng)負(fù)載變輕時(shí)，輸出功率減小，由于占空比不隨負(fù)載變化而變化，PFC級(jí)輸入功率同重載時(shí)一樣，則充入儲(chǔ)能電容的容量大于從儲(chǔ)能電容抽走的能量，導(dǎo)致儲(chǔ)能電容電壓上升。為了保持輸出電壓一致，電壓反饋環(huán)調(diào)節(jié)輸出電壓，使占空比減小，輸入能量也相應(yīng)減小，這個(gè)動(dòng)態(tài)過(guò)程要到輸入和輸出功率平衡后才停止。負(fù)載減小帶來(lái)的后果是電容電壓明顯上升，甚至達(dá)到上千伏。<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">　　降低電容電壓通常有兩種方法：一種方法就是采用變頻控制[4]，可以使電容電壓低于450V，但是頻率變化范圍可能高達(dá)十倍，不利于磁性元件的優(yōu)化設(shè)計(jì)。另一種就是采用變壓器繞組實(shí)現(xiàn)負(fù)反饋。用變壓器繞組實(shí)現(xiàn)負(fù)反饋可以降低電容電壓，但同時(shí)降低了功率因數(shù)，增加了電流的諧波含量。本文通過(guò)對(duì)現(xiàn)有拓?fù)涞姆治?，得出了一種新型帶低頻輔助開(kāi)關(guān)的功率因數(shù)校正電路，不僅降低了電容電壓，而且提高了功率因數(shù)，減少了電流的諧波含量。<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">3 幾種改進(jìn)的拓?fù)浞治?br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">3.1　加變壓器繞組抑制電容電壓的單級(jí)PFC<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">　　加變壓器繞組抑制電容電壓的單級(jí)PFC變換器[5]如圖1所示。N1為變壓器耦合的繞組。<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><center style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><div align="center" style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" src="http://editerupload.eepw.com.cn/fetch/20140213/231028_1_0.jpg" border="0" style="margin-top: 5px; margin-right: 10px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; "></div></center><br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><center style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; 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