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<span>時間：2024-03-27</span> <span>來源：Digikey</span> <link rel="stylesheet" type="text/css"/> <span style="float:right; width:150px;margin-right:0px; text-align:right;"> <div id="j9z11dj" class="nav0"> <ul> <li style="width:150px;"><a href="javascript:void(0);"><img src="http://cafeforensic.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://cafeforensic.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="xd19vxn" 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 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left;">在設(shè)計(jì)電源時，首先要回答的問題是「是否需要電流隔離？」使用電流隔離可以使電路更安全，抗干擾能力較強(qiáng)，容易實(shí)現(xiàn)升降壓轉(zhuǎn)換，及較易實(shí)現(xiàn)多路輸出和很寬的輸入電壓范圍。兩種最常見隔離電源的拓?fù)湫问绞恰阜醇ぁ购汀刚颉?。但是為了獲得更高的功率輸出，可以使用其他隔離拓?fù)淙纭竿仆臁?、「半橋」和「全橋」。?shí)際上，如果不需要電流隔離，工程師會盡量使用非隔離電源，因?yàn)楦綦x的拓?fù)湫问娇偸切枰儔浩骰蝾~外的線路，而且這種設(shè)備往往會增加成本和體積較大，通常很難滿足定制電源的需求。</p>本文引用地址：<a href="http://cafeforensic.com/article/202403/456906.htm">http://cafeforensic.com/article/202403/456906.htm</a><h2 style="text-align: left;">較常見的<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/非隔離拓?fù)?><em>非隔離拓?fù)?/em></a></h2><p style="text-align: left;">降壓轉(zhuǎn)換器 (Buck)</p><p style="text-align: left;">最常見非隔離式開關(guān)電源的拓?fù)浣Y(jié)構(gòu)是降壓轉(zhuǎn)換器。它將正輸入電壓轉(zhuǎn)換為低于輸入電壓的輸出電壓。其結(jié)構(gòu)簡單，只需要兩個開關(guān)、一個電感器和兩個電容器，如圖 1 所示。高側(cè)開關(guān)從輸入端產(chǎn)生脈沖電流并產(chǎn)生一個開關(guān)節(jié)點(diǎn)電壓，該電壓在輸入電壓和地之間來回震蕩。之后，使用LC 濾波器產(chǎn)生直流輸出電壓。根據(jù)控制高端開關(guān)PWM信號的占空比，產(chǎn)生不同電平的直流輸出電壓。這種 DC-DC 降壓轉(zhuǎn)換器非常省電，設(shè)計(jì)亦相對簡單，并且需要的元器件很少。</p><div style="text-align: left;"><p style="text-align:center"><img src="http://editerupload.eepw.com.cn/202403/1711526675944948.png" alt="image" width="636" height="172"/></p><p style="text-align: left;"><br/></p></div><div><p>圖 1. 降壓轉(zhuǎn)換器的概覽圖 ( 圖片來源 : ADI)</p></div><p>設(shè)計(jì)低噪聲系統(tǒng)時要留意，降壓轉(zhuǎn)換器在輸入側(cè)產(chǎn)生脈沖電流，而輸出側(cè)有來自電感器的連續(xù)電流。這就是降壓穩(wěn)壓器在輸入端噪聲很大而在輸出端噪聲不大的原因。</p><p>升壓轉(zhuǎn)換器 (Boost)</p><p>除了降壓外，另一種常見拓?fù)涫巧龎?。它的拓?fù)浣Y(jié)構(gòu)由五個基本功率元件組成，與降壓轉(zhuǎn)換器的拓?fù)溆悬c(diǎn)不同，如圖 2所示。</p><div><p><img src="http://editerupload.eepw.com.cn/202403/1711526676686840.png" alt="image" width="616" height="154"/></p></div><div><p>圖 2. 升壓轉(zhuǎn)換器的概覽圖 ( 圖片來源 : ADI)</p></div><p>選擇升壓轉(zhuǎn)換器時，需要留意數(shù)據(jù)表上較普遍列出最大額定開關(guān)電流而不是最大輸出電流。在降壓轉(zhuǎn)換器中，最大開關(guān)電流與可實(shí)現(xiàn)的最大輸出電流直接相關(guān)，但與輸入電壓和輸出電壓之間的電壓比無關(guān)。在升壓穩(wěn)壓器中，電壓比是根據(jù)固定的最大開關(guān)電流而直接影響可能的最大輸出電流。所以在選擇合適的升壓穩(wěn)壓器時，工程師不僅需要了解所需的輸出電流，還需要了解系統(tǒng)需要的輸入和輸出電壓。</p><p>升壓轉(zhuǎn)換器的輸入端噪聲非常低，因?yàn)榕c輸入端連接的電感可防止電流快速變化。然而，輸出端噪聲較大，因?yàn)長C濾波器位于輸入端，我們會看到脈沖電流流向外部開關(guān)，造成輸出紋波。因此與降壓拓?fù)湎啾?，輸出紋波更受關(guān)注。</p><p>反相降壓 - 升壓穩(wěn)壓器 (Inverting)</p><p>第三種常見拓?fù)涫欠聪嘟祲?升壓轉(zhuǎn)換器，由這五個元件組成。該名稱源于該轉(zhuǎn)換器采用正輸入電壓并將其轉(zhuǎn)換為負(fù)輸出電壓的事實(shí)。除此之外，輸入電壓可能大于或少于反相輸出電壓的絕對值。例如，輸入端的 5V 或 24V 可能會產(chǎn)生 -12V 輸出電壓。這是可行而無需進(jìn)行任何特殊的電路修改，如下圖 3所示。</p><div><p><img src="http://editerupload.eepw.com.cn/202403/1711526677782822.png" alt="image" width="604" height="158"/></p></div><div><p>圖 3. 反相降壓 - 升壓轉(zhuǎn)換器的概覽圖 ( 圖片來源 : ADI)</p></div><p>在反相降壓-升壓拓?fù)渲?，電感從開關(guān)節(jié)點(diǎn)連接到地。轉(zhuǎn)換器的輸入端和輸出端都看到脈沖電流，輸出電流是不連續(xù)的，使反相降壓/升壓轉(zhuǎn)換器的輸出電壓往往噪聲較大，所以在低噪聲應(yīng)用中，可以通過增加額外的輸入和輸出濾波來補(bǔ)償。</p><p>反相降壓-升壓拓?fù)湓?a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/電源設(shè)計(jì)"><em>電源設(shè)計(jì)</em></a>中有一個好處，就是任何降壓穩(wěn)壓器均可應(yīng)用此拓?fù)?。?ADI 的 ADP2441 或 ADP2442 ，為了將降壓穩(wěn)壓器轉(zhuǎn)換為反相降壓-升壓拓?fù)浣Y(jié)構(gòu)，電感和輸出電容應(yīng)以與降壓拓?fù)浣Y(jié)構(gòu)相似的方式連接，如圖4所示。</p><div><p><img src="http://editerupload.eepw.com.cn/202403/1711526678964484.png" alt="image" width="555" height="367"/></p></div><div><p>圖 4. ADP2441/ADP2442 實(shí)現(xiàn)的反相降壓 - 升壓拓?fù)浣Y(jié)構(gòu) ( 圖片來源 : ADI)</p></div><h2>專業(yè)的拓?fù)浣Y(jié)構(gòu)</h2><p>除了以上三種常見非隔離開關(guān)電源拓?fù)渲猓€有更多的拓?fù)淙鏢EPIC、Zeta、?uk 和 4 開關(guān)降壓-升壓。相比以上三種開關(guān)電源拓?fù)涠?，這些拓?fù)浣Y(jié)構(gòu)都需要額外置多一些有電源組件，會增加產(chǎn)品成本，功率轉(zhuǎn)換效率亦會降低。一般而言，在電路中添加額外元器件會增加損耗。以下簡單列出這四款不同拓?fù)涞囊恍┳钪匾δ堋?/p><p>SEPIC</p><p>單端初級電感轉(zhuǎn)換器(SEPIC)允許輸出電壓大于或小于輸入電壓的電壓轉(zhuǎn)換，輸出電壓由主控開關(guān)（三極管或MOS管）的占空比控制。升壓穩(wěn)壓器升壓穩(wěn)壓器 IC 可用于設(shè)計(jì) SEPIC 電源電路。要留意，這種拓?fù)湓陔娐分行枰矶囝~外元件(電感和電容)，如圖 7所示.</p><p>Zeta</p><p>Zeta轉(zhuǎn)換器與SEPIC轉(zhuǎn)換器類似，如 LT8471 Zeta 和 SEPIC 拓?fù)涞暮喕韴D (圖 5) 所示，都需要兩個電感(L1A和、兩L1B)、兩個開關(guān)（Q1 和 D1 ）和一個電容器（CF）。 Zeta轉(zhuǎn)換器能夠產(chǎn)生正或負(fù)輸出電壓，此外，它沒有右半平面零 (RHPZ) 問題存在，從而簡化了調(diào)節(jié)回路。</p><blockquote><p>右半平面零 (RHPZ)<br/>含有右半平面零點(diǎn)（RHPZ）的開關(guān)DC-DC變換器發(fā)生占空比突變時，暫態(tài)過程會出現(xiàn)負(fù)調(diào)現(xiàn)象，該現(xiàn)象會導(dǎo)致系統(tǒng)暫態(tài)性能變差，負(fù)調(diào)持續(xù)時間段系統(tǒng)易形成正反饋而出現(xiàn)不穩(wěn)定現(xiàn)象，傳統(tǒng)的頻域法無法直接進(jìn)行控制器設(shè)計(jì)，因此對其進(jìn)行控制較最小相位系統(tǒng)困難的多。</p></blockquote><div><p><img src="http://editerupload.eepw.com.cn/202403/1711526679204773.png" alt="image" width="596" height="238"/></p></div><div><p>圖 5. Zeta 和 SEPIC 拓?fù)浣Y(jié)構(gòu) ( 圖片來源 : ADI)</p></div><p>?uk</p><p>?uk 轉(zhuǎn)換器可將正輸入電壓轉(zhuǎn)換為負(fù)輸出電壓。它使用兩個電感器，一個在輸入側(cè)，一個在輸出側(cè)，因此輸入和輸出側(cè)的噪聲非常低，可是，支持這種拓?fù)浣Y(jié)構(gòu)的開關(guān)電源轉(zhuǎn)換器的器件并不多，因?yàn)檎{(diào)節(jié)環(huán)路需要一個負(fù)電壓反饋引腳。如 ADI 的 LT8331，它需要在輸入和輸出之間使用兩個電感器和一個耦合電容器 (C5)。耦合或阻塞電容器從電路的輸入側(cè)接收能量并將其傳輸?shù)诫娐返妮敵鰝?cè)。在穩(wěn)態(tài)條件下（即上電后），該電容器兩端的電壓是恒定的，大約等于 VIN，如圖6所示。</p><div><p><img src="http://editerupload.eepw.com.cn/202403/1711526680920573.png" alt="image" width="568" height="317"/></p></div><div><p>圖 6. LT8331 實(shí)現(xiàn)的 ?uk 拓?fù)浣Y(jié)構(gòu) ( 圖片來源 : ADI)</p></div><p>四開關(guān)降壓 - 升壓</p><p>這種類型的轉(zhuǎn)換器近年來變得非常流行。四開關(guān)降壓-升壓從正輸入電壓中提供正輸出電壓，該輸入電壓可能高于或低于調(diào)整后的輸出電壓。這類型的轉(zhuǎn)換器能夠提供更高的電源轉(zhuǎn)換效率并且只需要一個電感器，所以該轉(zhuǎn)換器可以取代了 SEPIC 的設(shè)計(jì)。如 ADI 的 LT8705 ，它是一款同步四開關(guān)降壓-升壓控制器，運(yùn)用輸入和輸出側(cè)各兩個開關(guān)，使用穩(wěn)健的同步開關(guān)拓?fù)浣Y(jié)構(gòu)，以高效率為恒壓或恒流應(yīng)用提供高功率輸出。如圖7所示。</p><div><p><img src="http://editerupload.eepw.com.cn/202403/1711526681328024.png" alt="image" width="580" height="346"/></p></div><div><p>圖 7. LT8705 實(shí)現(xiàn)的四開關(guān)降壓 - 升壓拓?fù)浣Y(jié)構(gòu) ( 圖片來源 : ADI)</p></div></span>  <div class="1xlvvvp" 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" target="_blank" /> <area shape="rect" coords="132,315,319,335" /> </map> </center> </div>  <span id="9pn19h9" class="hAd8"> <br></span>   </div> </article> <div id="vbh9rrj" class="clear"></div> <br/> <div id="znd19n9" class="hAd6"> <div class="tzdfl9t" id="relA" style="width:auto;height:auto;"> <ul> <li>  <iframe id='af71d594' name='af71d594' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=114&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='650' height='30'><a target='_blank'><img 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