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<article> <h1>無源無損緩沖電路及其新拓?fù)?/h1> <div id="mxvtnxs" 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="gfscscx" 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="okfoilz" 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="gcegpdn" class="content" id="contentDiv" style="position:relative;"> <div id="mpgudym" 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">摘要：在分析無源<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/無損"><em>無損</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/緩沖"><em>緩沖</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電路"><em>電路</em></a>的<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/拓?fù)?><em>拓?fù)?/em></a>分類和硬開關(guān)轉(zhuǎn)換過程中開關(guān)損耗的基礎(chǔ)上，總結(jié)了無源<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/無損"><em>無損</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/緩沖"><em>緩沖</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電路"><em>電路</em></a>的結(jié)構(gòu)原理和一般實(shí)現(xiàn)方法。重點(diǎn)介紹了其在DC/DC變換器中兩種新穎的<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/拓?fù)?><em>拓?fù)?/em></a>結(jié)構(gòu)，并簡要地分析了它們的工作原理和優(yōu)缺點(diǎn)。 </span></p>本文引用地址：<a href="http://www.ex-cimer.com/article/179409.htm">http://www.ex-cimer.com/article/179409.htm</a><p><span style="color: #000000">關(guān)鍵詞：無源<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/無損"><em>無損</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/緩沖"><em>緩沖</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電路"><em>電路</em></a>；DC/DC變換器；功率因數(shù)校正 </span></p><p><span style="color: #000000">　　 </span></p><p><span style="color: #000000">1 概述 </span></p><p><span style="color: #000000"> 在硬開關(guān)電路中，有源開關(guān)器件連接在剛性的電壓源或電流源上，開關(guān)損耗大、電磁干擾嚴(yán)重、可靠性低，且隨著開關(guān)頻率的提高，這種現(xiàn)象更為嚴(yán)重。為了克服這些缺陷，軟開關(guān)技術(shù)被廣泛采用。 </span></p><p><span style="color: #000000"> 有源緩沖電路、RCD緩沖電路、諧振變換器、無源無損緩沖電路是常用的軟開關(guān)技術(shù)。其中，有源緩沖電路通過增添輔助開關(guān)以減少開關(guān)損耗，但這也增加了主電路和控制電路的復(fù)雜程度，從而增大了性價(jià)比，也降低了可靠性；RCD緩沖電路雖然結(jié)構(gòu)最簡單，價(jià)格最便宜，但由于電阻消耗了能量，效率較低，在各種軟開關(guān)技術(shù)中性能最差；而諧振變換器雖然實(shí)現(xiàn)了ZVS或ZCS，減少了開關(guān)損耗，但諧振能量必須足夠大，才能創(chuàng)造ZVS或ZCS條件，而且諧振電路中循環(huán)電流較大，還必須在特定的軟開關(guān)控制器的控制信號(hào)下工作，增加了通態(tài)損耗、增加了成本、降低了可靠性。與這三種方法不同，無源無損緩沖電路既不使用有源器件，也不使用耗能元件，因而兼具以上三種方法的優(yōu)點(diǎn)。其結(jié)構(gòu)與RCD緩沖電路一樣簡單，效率與有源緩沖電路、諧振變換器一樣高，電磁干擾小、造價(jià)低、性能好、可靠性高，因而獲得了廣泛的應(yīng)用。 </span></p><p><span style="color: #000000"> 目前，無源無損緩沖技術(shù)雖已比較成熟，但在國內(nèi)外仍不時(shí)有新的<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/拓?fù)?><em>拓?fù)?/em></a>和研究成果發(fā)表。本文在參考了最近20多年中無源無損緩沖電路研究成果的基礎(chǔ)上，總結(jié)了無源無損緩沖電路的結(jié)構(gòu)原理和一般實(shí)現(xiàn)方法。此外，重點(diǎn)介紹了其在PWM DC/DC變換器中兩種最新的拓?fù)浣Y(jié)構(gòu)，分析了它們的工作原理，并比較了它們的優(yōu)缺點(diǎn)。 </span></p><p><span style="color: #000000">2 拓?fù)浞诸?</span></p><p><span style="color: #000000"> 在過去的幾十年里，出現(xiàn)了許多不同的無源無損緩沖電路的拓?fù)浣Y(jié)構(gòu)，它們可以用一套屬性來描述[1]。為此，可劃分為兩類：一類是最小電壓應(yīng)力單元（MVS），如圖1（a），圖1（b）所示；另一類是非最小電壓應(yīng)力單元（Non-MVS）,如圖1（c），圖1（d），圖1（e），圖1(f)所示。最小電壓應(yīng)力單元<sup>[2]</sup>僅使用一個(gè)電感和電容值較小的電容就能使主開關(guān)管電壓應(yīng)力最小，但實(shí)現(xiàn)軟開關(guān)的范圍不大；非最小電壓應(yīng)力單元<sup>[3]</sup>增加了一個(gè)電感，同時(shí)也增加了主開關(guān)管的電壓應(yīng)力，但與最小電壓應(yīng)力單元相比，在同樣的電感和電容下，其軟開關(guān)范圍較大。而且，在小功率情況下，具有較高的效率。 </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="141" src="http://editerupload.eepw.com.cn/fetch/20131009/179409_1_0.jpg" width="350" border="0" style="zoom: 1" alt="" /> </span></p><p align="center"><span style="color: #000000">(a) MVS (b) MVS </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="144" src="http://editerupload.eepw.com.cn/fetch/20131009/179409_1_1.jpg" width="372" border="0" style="zoom: 1" alt="" /> </span></p><p align="center"><span style="color: #000000">(c)Non-MVS (d)Non-MVS </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="109" src="http://editerupload.eepw.com.cn/fetch/20131009/179409_1_2.jpg" width="374" border="0" style="zoom: 1" alt="" /> </span></p><p align="center"><span style="color: #000000">(e)Non-MVS (f)Non-MVS </span></p><p align="center"><span style="color: #000000">圖 1 無源無損緩沖電路拓撲結(jié) 構(gòu) </span></p><p><span style="color: #000000">3 結(jié)構(gòu)原理與實(shí)現(xiàn)方法 </span></p><p><span style="color: #000000"> 硬開關(guān)電路在開關(guān)時(shí)，存在3種損耗： </span></p><p><span style="color: #000000"> 1）開通時(shí)，由續(xù)流二極管的反向恢復(fù)電流引起的浪涌電流，會(huì)導(dǎo)致較大的導(dǎo)通損耗； </span></p><p><span style="color: #000000"> 2）開通時(shí)，MOSFET的寄生結(jié)電容放電會(huì)引起損耗； </span></p><p><span style="color: #000000"> 3）關(guān)斷時(shí)，MOSFET的結(jié)電容電壓的快速增加，會(huì)導(dǎo)致較大的關(guān)斷損耗。 </span></p><p><span style="color: #000000"> 針對硬開關(guān)電路的上述損耗構(gòu)成，一個(gè)基本的無源無損緩沖電路一般都包含3個(gè)功能電路： </span></p><p><span style="color: #000000"> 1）開通緩沖電路； </span></p><p><span style="color: #000000"> 2）關(guān)斷緩沖電路； </span></p><p><span style="color: #000000"> 3）饋能電路。 </span></p><p><span style="color: #000000"> 常用的方法是用電感（<i>L</i>）與功率管串聯(lián)，開通時(shí)電流只能從零增加，因而“零電流”使開通得到軟化；用電容（<i>C</i>）與功率管并聯(lián)，關(guān)斷時(shí)功率管兩端電壓只能從零增大，因而“零電壓”使關(guān)斷得到軟化；用二極管（D）經(jīng)過一定的拓?fù)渚W(wǎng)絡(luò)，在功率管開關(guān)過程中，將<i>L</i>，<i>C</i>中的存儲(chǔ)能量反饋到電源或饋送給負(fù)載。根據(jù)變換器電路的不同，電容可直接并聯(lián)于功率管，也可跨接于功率管輸出與負(fù)載之間，或跨接于功率管輸入端與電源正端之間。后兩種跨接方式都要求功率管關(guān)斷之前，電容<i>C</i>已充電到電源電壓的大小。饋能電路常用的方法有：當(dāng)要求一個(gè)電容的充電終了電壓要大于電源電壓時(shí)，則電源可通過電感給電容充電，如忽略損耗，充電終了電壓將達(dá)到2倍電源電壓；如一個(gè)充好電的電容，在工作中需要改變電壓極性，則可通過串聯(lián)一個(gè)電感實(shí)現(xiàn)振蕩放電來完成；電感還可用于將一個(gè)電容的儲(chǔ)能轉(zhuǎn)移到另一個(gè)電容中去，當(dāng)然這里還必須有二極管組成的電路配合；能量的存儲(chǔ)或轉(zhuǎn)移還可采用互感的方法等等。 </span></p><p><span style="color: #000000"> 無源無損緩沖電路的三功能電路結(jié)構(gòu)特點(diǎn)，雖然無法象有源軟開關(guān)方案那樣，在超前或滯后主開關(guān)的控制時(shí)序下吸收能量或供給能量，以創(chuàng)造出真正的ZVS或ZCS條件，但它通過將開關(guān)期間的電壓與電流波形錯(cuò)開，使二者的重疊面積最小，可以顯著降低前述1）和3）項(xiàng)開關(guān)損耗。雖然對2）項(xiàng)的開關(guān)器件內(nèi)寄生結(jié)電容的放電損耗，無法被無源無損緩沖電路所消除，但此種損耗較其它開關(guān)損耗低得多，對于提高整體效率作用較小。考慮到無源無損緩沖電路沒有引入輔助有源器件，和其它軟開關(guān)方案相比，它沒有增加額外的輔助有源器件損耗，因此，在同樣的開關(guān)損耗功率降低情況下，無源無損緩沖電路可以獲得更高的效率提高[4]。所以，無源無損緩沖電路被廣泛地應(yīng)用于PWM變換器中。 </span></p><p><span style="color: #000000">4 無源無損緩沖電路在DC/DC變換器中的應(yīng)用 </span></p><p><span style="color: #000000"> 隨著電力電子技術(shù)、計(jì)算機(jī)技術(shù)、通信技術(shù)的發(fā)展，無源無損緩沖電路不僅廣泛應(yīng)用于PWM DC/DC變換器，PWMAC/DC整流器[5]和PWM DC/AC逆變器<sup>[6]</sup>中，而且與多電平變換器和PFC也有著密切的聯(lián)系<sup>[7]</sup>。以下介紹兩種無源無損緩沖電路在PWM DC/DC變換器中的最新拓?fù)浣Y(jié)構(gòu)。 </span></p><p><span style="color: #000000">4.1 再生式的無源無損緩沖電路 </span></p><p><span style="color: #000000"> 圖2為文獻(xiàn)[8]提出的一種無源再生式的軟開關(guān)Boost變換器，它是傳統(tǒng)的<i>L</i>＋RCD復(fù)合型緩沖電路的改進(jìn)。其改進(jìn)點(diǎn)包括： </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="162" src="http://editerupload.eepw.com.cn/fetch/20131009/179409_1_3.jpg" width="238" border="0" style="zoom: 1" alt="" /> </span></p><p align="center"><span style="color: #000000">圖 2 再生式無源無損緩沖電路 </span></p><p><span style="color: #000000"> 1）去掉放電電阻<i>R</i>； </span></p><p><span style="color: #000000"> 2）去掉專門的功率電感器L，巧妙地用一個(gè)同輸入電感<i>L</i><sub>p</sub>耦合的小功率繞組<i>L</i><sub>a</sub>代替。 </span></p><p><span style="color: #000000"> 下面分析圖2電路的工作過程。分析中假設(shè)： </span></p><p><span style="color: #000000"> 1）輸入電壓<i>V</i><sub>i</sub>恒定，主電感<i>L</i><sub>p</sub>遠(yuǎn)大于緩沖電感<i>L</i><sub>s</sub>，以致輸入電流<i>I</i><sub>s</sub>恒定； </span></p><p><span style="color: #000000"> 2）輸出電容<i>C</i><sub>o</sub>足夠大，以致輸出電壓<i>V</i><sub>o</sub>恒定； </span></p><p><span style="color: #000000"> 3）只考慮續(xù)流二極管D的反向恢復(fù)電流和主開關(guān)S的開關(guān)過渡時(shí)間，其它元器件均為理想的； </span></p><p><span style="color: #000000"> 4）初始狀態(tài)為S關(guān)斷，D開通，<i>i</i><sub>D</sub>=<i>I</i><sub>s</sub>。 </span></p><p><span style="color: #000000"> 則對感性負(fù)載CCM工作情況，穩(wěn)態(tài)時(shí)每個(gè)周期可以分為以下6個(gè)模態(tài)，相應(yīng)的等效電路圖和主要波形圖如圖3及圖4所示。 </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="126" src="http://editerupload.eepw.com.cn/fetch/20131009/179409_1_4.jpg" width="176" border="0" style="zoom: 1" alt="" /> </span></p><p align="center"><span style="color: #000000">(a) 模態(tài)1(<i>t</i><sub>1</sub>～<i>t</i><sub>2</sub>)等效電路 </span>  <div class="ilrxrfl" 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" 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