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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> > 三電平軟開關(guān)直流變換器典型拓?fù)浞治?/p> </div> </div> </div>   <script src="https://forum.eepw.com.cn/jscontent/wenzilian" type="text/javascript"></script>  <div class="adjwulk" id="container"> <section> <article> <h1>三電平軟開關(guān)直流變換器典型拓?fù)浞治?/h1> <div id="ipyafwr" class="authorTimeSource"> <span>作者：</span> <span>時(shí)間：2011-03-19</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="onsmzut" 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="arivtdf" 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="ojdqgtd" class="content" id="contentDiv" style="position:relative;"> <div id="wzizizm" 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><span style="color: #000000">1 引言 </span></p>本文引用地址：<a href="http://www.ex-cimer.com/article/179404.htm">http://www.ex-cimer.com/article/179404.htm</a><p><span style="color: #000000"> 近年來，人們對(duì)電力電子裝置的電壓等級(jí)和功率等級(jí)的要求不斷提高，三<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電平"><em>電平</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/變換器"><em>變換器</em></a>作為順應(yīng)這一潮流的一種解決方案受到越來越多的關(guān)注。三<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電平"><em>電平</em></a><sup>[1]</sup>大大降低了<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/開關(guān)"><em>開關(guān)</em></a>管的電壓等級(jí)，這樣有利于減小<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/開關(guān)"><em>開關(guān)</em></a>損耗，提高效率，降低成本。為了減小<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/變換器"><em>變換器</em></a>的體積和重量，高頻化是電力電子學(xué)一直追求的目標(biāo)，伴隨著高頻化，功率器件的<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/開關(guān)"><em>開關(guān)</em></a>損耗問題成為一個(gè)日益突出的矛盾，由此軟開關(guān)技術(shù)應(yīng)運(yùn)而生，成為降低開關(guān)損耗，提高系統(tǒng)效率以及改善EMI問題的一個(gè)重要手段。 </span></p><p><span style="color: #000000"> 三<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電平"><em>電平</em></a>零電壓軟開關(guān)<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/直流"><em>直流</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/變換器"><em>變換器</em></a>即是由此應(yīng)運(yùn)而生的一種新型，實(shí)用的<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/拓?fù)?><em>拓?fù)?/em></a>，通過采用移相控制技術(shù)，利用開關(guān)管的結(jié)電容和變壓器漏感的諧振實(shí)現(xiàn)開關(guān)管的零電壓開關(guān)。通過高頻變壓器漏感儲(chǔ)能對(duì)功率開關(guān)管兩端輸出電容的充放電使開關(guān)管兩端電壓下降為零，使變換器4個(gè)開關(guān)管依次在零電壓下導(dǎo)通，在緩沖電容作用下零電壓關(guān)斷，從而有效地降低了電路的開關(guān)損耗和開關(guān)噪聲，減少了器件開關(guān)過程中的電磁干擾，為變換器提高開關(guān)頻率，提高效率，降低尺寸及重量提供了良好的條件。 </span></p><p><span style="color: #000000"> 但在實(shí)際應(yīng)用中，三電平零電壓軟開關(guān)（ZVS）變換器存在著幾個(gè)較難克服的問題，從而出現(xiàn)了一系列改進(jìn)<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/拓?fù)?><em>拓?fù)?/em></a>。為此，本文系統(tǒng)地總結(jié)和<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/分析"><em>分析</em></a>了目前較為實(shí)用和<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/典型"><em>典型</em></a>的三電平零電壓軟開關(guān)變換器<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/拓?fù)?><em>拓?fù)?/em></a>。 </span></p><p><span style="color: #000000">2 傳統(tǒng)三電平零電壓軟開關(guān)<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/直流"><em>直流</em></a>變換器優(yōu)缺點(diǎn) </span></p><p><span style="color: #000000"> 傳統(tǒng)的三電平ZVS軟開關(guān)<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/直流"><em>直流</em></a>變換器（three-level zero voltage switching DC/DC converter，簡(jiǎn)稱TL-ZVS DC/DC converter）如圖1所示。其拓?fù)涮攸c(diǎn)<sup>[2]</sup>是引入大容量飛跨電容<i>C</i><sub>ss</sub>，變換器工作時(shí)其電壓穩(wěn)定在<i>V</i><sub>in</sub>/2，使得超前管、滯后管實(shí)現(xiàn)軟開關(guān)的條件相互獨(dú)立，互不干擾；并且將移相技術(shù)與軟開關(guān)技術(shù)結(jié)合起來，能很好地降低電路中的損耗，提高效率。因此，非常適合高輸入電壓中大功率場(chǎng)合。 </span></p><p align="center"><span style="color: #000000"><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" height="222" src="http://editerupload.eepw.com.cn/fetch/20131009/179404_1_0.jpg" width="350" border="0" style="zoom: 1" alt="" /> </span></p><p align="center"><span style="color: #000000">圖1 傳統(tǒng)的三電平移相全橋ZVS變換器 </span></p><p></p><p><span style="color: #000000"> 但是，傳統(tǒng)的三電平ZVS軟開關(guān)直流變換器也存在不少問題。諸如 </span></p><p><span style="color: #000000"> 1）滯后臂在輕載情況下很難實(shí)現(xiàn)軟開關(guān)，使得它不適合應(yīng)用于負(fù)載大范圍變化的場(chǎng)合； </span></p><p><span style="color: #000000"> 2)環(huán)流能量大大增加，輸入<i>V</i><sub>in</sub>越高，變換器效率越低，因?yàn)椋?i>V</i><sub>in</sub>越高，零狀態(tài)時(shí)間越長(zhǎng)；在零狀態(tài)時(shí)，原邊電流處于自然續(xù)流狀態(tài)，一次側(cè)沒有能量傳遞到輸出級(jí)，而在變壓器，諧振電感和開關(guān)管中卻存在通態(tài)損耗； </span></p><p><span style="color: #000000"> 3）由于諧振電感的存在，使得變壓器副邊有占空比丟失現(xiàn)象，變壓器漏感<i>L</i><sub>1k</sub>越大，占空比損失<i>D</i><sub>loss</sub>越大，<i>D</i><sub>loss</sub>使次級(jí)占空比<i>D</i><sub>sec</sub>減?。?</span></p><p><span style="color: #000000"> 4）副邊整流二極管電壓尖峰大。 </span></p><p><span style="color: #000000">3 改進(jìn)拓?fù)?a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/分析"><em>分析</em></a> </span></p><p><span style="color: #000000">3.1 滯后臂輕載軟開關(guān)的實(shí)現(xiàn) </span></p><p><span style="color: #000000"> 參見圖1，為了改善傳統(tǒng)的三電平FB-ZVS變換器滯后臂的零電壓開關(guān)負(fù)載范圍，一個(gè)最直接的方法就是增加變壓器的漏感或在變壓器原邊串接一個(gè)電感<i>L</i><sub>r</sub>，以增大諧振電感的儲(chǔ)能，使之在輕載下也可以實(shí)現(xiàn)對(duì)滯后臂開關(guān)管并聯(lián)電容的完全充放電，實(shí)現(xiàn)滯后臂開關(guān)管的零電壓導(dǎo)通。但這樣做有以下缺點(diǎn)。 </span></p><p><span style="color: #000000"> 1)環(huán)流能量進(jìn)一步增加設(shè)變換器的零電壓導(dǎo)通負(fù)載范圍為<i>I</i><sub>o</sub>≥<i>I</i><sub>omin</sub>，<i>I</i><sub>omin</sub>=20％<i>I</i><sub>omax</sub>（<i>I</i><sub>omax</sub>為變換器滿載運(yùn)行時(shí)輸出電流值）。當(dāng)變換器以20％負(fù)載運(yùn)行時(shí)，滯后臂開關(guān)管關(guān)斷時(shí)的電感儲(chǔ)能為 </span></p><p><span style="color: #000000"> <i>E</i><sub>min</sub>=(<i>L</i><sub>lk</sub>＋<i>L</i><sub>r</sub>)<i>I</i><sub>omin</sub><sup>2</sup>/(2<i>n</i><sup>2</sup>) </span></p><p><span style="color: #000000"> 當(dāng)以滿載運(yùn)行時(shí)，電感儲(chǔ)能 </span></p><p><span style="color: #000000"> <i>E</i><sub>max</sub>=(<i>L</i><sub>lk</sub>＋<i>L</i><sub>r</sub>)<i>I</i><sub>omax</sub><sup>2</sup>/(2<i>n</i><sup>2</sup>) 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