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<a href="/info/articlelist/special/led/type/5">設(shè)計(jì)應(yīng)用</a> > 建議收藏！汽車LED驅(qū)動(dòng)器功率轉(zhuǎn)換拓?fù)渲改?/p> </div> </div> </div>   <script src="https://forum.eepw.com.cn/jscontent/wenzilian" type="text/javascript"></script>  <div class="6666616" id="container"> <section> <article> <h1>建議收藏！汽車LED驅(qū)動(dòng)器功率轉(zhuǎn)換拓?fù)渲改?/h1> <div id="6161616" class="authorTimeSource"> <span>作者：</span> <span>時(shí)間：2022-07-27</span> <span>來源：ADI</span> <link rel="stylesheet" type="text/css"/> <span style="float:right; width:130px;margin-right:0px; text-align:right;"> <div id="6116111" class="nav0"> <ul> <li><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" />加入技術(shù)交流群</a> <ul> <li style="text-align:center;"><img src="http://www.ex-cimer.com/event/company/images/code_1.jpg" width="130"><br />掃碼加入<br />和技術(shù)大咖面對(duì)面交流<br />海量資料庫(kù)查詢</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="1116616" 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="1661611" class="content" id="contentDiv" style="position:relative;"> <div id="1111616" 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="text-indent: 2em; text-align: left;">在很多系統(tǒng)中（包括汽車動(dòng)力輸出系統(tǒng)中部署的眾多調(diào)節(jié)器），功率轉(zhuǎn)換控制器的設(shè)計(jì)都是一項(xiàng)困難而復(fù)雜的工作。本文說明了<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/LED"><em>LED</em></a>驅(qū)動(dòng)器使用的不同開關(guān)拓?fù)涞膬?yōu)勢(shì)、權(quán)衡取舍和應(yīng)用，旨在簡(jiǎn)化選擇過程。</p>本文引用地址：<a href="http://www.ex-cimer.com/article/202207/436692.htm">http://www.ex-cimer.com/article/202207/436692.htm</a><p><br/></p><p style="text-indent: 2em; text-align: left;"><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/LED"><em>LED</em></a>不同于傳統(tǒng)的帶有燈絲或氣體成分的電燈。利用特定的半導(dǎo)體結(jié)，<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/LED"><em>LED</em></a>制造商可以生成整個(gè)可見光范圍的特定顏色的光，以及紅外線和紫外線。在汽車應(yīng)用中，LED可以提高白天和夜間駕駛的安全性。效率的提高可以延長(zhǎng)電動(dòng)汽車的電池壽命，而在單個(gè)系統(tǒng)中使用多個(gè)LED可以避免單一部件的故障問題。</p><p><br/></p><p style="text-indent: 2em; text-align: left;">由于其多功能性，LED能夠以多種不同的方式驅(qū)動(dòng)。由于LED的輸出有良好的照明控制，因此LED負(fù)載與電力系統(tǒng)的傳統(tǒng)負(fù)載不同。LED只靠通過半導(dǎo)體結(jié)的精確控制電流來發(fā)光，而端口到系統(tǒng)接地（或汽車系統(tǒng)中的底盤）的相對(duì)電壓則與此無關(guān)。因此，LED系統(tǒng)可以利用開關(guān)技術(shù)提供的不同拓?fù)洹?/p><p><br/></p><p style="text-indent: 2em; text-align: left;">如何為汽車LED系統(tǒng)選擇正確的開關(guān)拓?fù)?/p><p><br/></p><p style="text-indent: 2em; text-align: left;">汽車系統(tǒng)中特定開關(guān)拓?fù)涞倪x擇關(guān)系到整個(gè)系統(tǒng)設(shè)計(jì)；應(yīng)考慮最小輸入電壓、最大串電壓、底盤回路能力、短路輸出能力、最大輸入電流、輸出/LED電流和PWM調(diào)光。</p><p><br/></p><p style="text-indent: 2em; text-align: left;">降壓(Buck)轉(zhuǎn)換器</p><p><br/></p><p style="text-indent: 2em; text-align: left;">降壓LED驅(qū)動(dòng)器通過高于LED串總電壓的電壓調(diào)節(jié)LED串中的電流。降壓LED驅(qū)動(dòng)器可以安全地短接到系統(tǒng)地，確保其本質(zhì)安全。它們具有底盤回流的能力（一條線用于供電），并且可以輕松適應(yīng)矩陣或動(dòng)畫應(yīng)用。圖1和圖2中的示例原理圖顯示了控制器調(diào)節(jié)高壓側(cè)開關(guān)進(jìn)行電流控制的基本系統(tǒng)圖。</p><p><br/></p><p style="text-align:center"><img src="http://editerupload.eepw.com.cn/fetch/202207/91571ae04b225323323ae01637e449be.png" title="1657802426662518.png" alt="21.png"/></p><p>圖1.降壓轉(zhuǎn)換器</p><p><br/></p><p>降壓LED驅(qū)動(dòng)器需要具備幾個(gè)關(guān)鍵特性：固定頻率操作、通過出色的開關(guān)控制和低電阻開關(guān)實(shí)現(xiàn)高效率、在整個(gè)模擬調(diào)光范圍內(nèi)提供高精度，以及為獲得出色的EMI，適當(dāng)設(shè)計(jì)擴(kuò)頻調(diào)頻。</p><p><br/></p><p>升壓(BOOST)轉(zhuǎn)換器</p><p><br/></p><p>升壓LED驅(qū)動(dòng)器通過低于LED串總電壓的電壓調(diào)節(jié)LED串中的電流。這在很多汽車系統(tǒng)中很有用，其中很多LED都需要在單個(gè)串中導(dǎo)通。典型的12 V汽車系統(tǒng)的工作電壓范圍為6 V至18 V，這需要將LED驅(qū)動(dòng)器的電壓降到6 V，從而為L(zhǎng)ED提供較大的升壓比，以保持點(diǎn)亮。圖3和圖4中的示例原理圖顯示了控制器調(diào)節(jié)低壓側(cè)開關(guān)進(jìn)行電流控制的基本系統(tǒng)圖。</p><p><br/></p><p><img src="http://editerupload.eepw.com.cn/202207/1658886350197466.png" title="1657802331292705.png" alt="22.png"/></p><p>圖2.降壓轉(zhuǎn)換器示例: LT3932 </p><p><br/></p><p><img src="http://editerupload.eepw.com.cn/202207/1658886351549613.png" title="1657802322900090.png" alt="23.png"/></p><p>表1使用降壓轉(zhuǎn)換器作為L(zhǎng)ED驅(qū)動(dòng)器的優(yōu)勢(shì)和權(quán)衡取舍</p><p><br/></p><p><img src="http://editerupload.eepw.com.cn/202207/1658886351604729.png" title="1657802313605315.png" alt="24.png"/></p><p>圖3.升壓轉(zhuǎn)換器</p><p><br/></p><p><img src="http://editerupload.eepw.com.cn/202207/1658886352135131.png" title="1657802299224939.png" alt="1657802299224939.png" width="680" height="388"/></p><p>圖4.升壓轉(zhuǎn)換器示例：LT8356-1</p><p><br/></p><p><img src="http://editerupload.eepw.com.cn/202207/1658886352865353.png" title="1657802292189822.png" alt="26.png"/></p><p>表2使用升壓轉(zhuǎn)換器作為L(zhǎng)ED驅(qū)動(dòng)器的優(yōu)勢(shì)和權(quán)衡取舍</p><p><br/></p><p>使用升壓轉(zhuǎn)換器進(jìn)行升壓-降壓</p><p><br/></p><p>一些升壓LED驅(qū)動(dòng)器可配置為將LED陰極返回電源。這種配置稱為降壓-升壓?？傒敵鲭妷簽閂IN (VBATTERY)，該電壓加到LED串總電壓中。這種拓?fù)浣Y(jié)構(gòu)的優(yōu)點(diǎn)是能夠驅(qū)動(dòng)一個(gè)高于、低于或等于電源電壓的LED串。這種拓?fù)浣Y(jié)構(gòu)的局限性是只受轉(zhuǎn)換器的限制--低端受控制器IC的最小電源電壓限制，高端受控制器IC的最大輸出電壓限制。</p><p><br/></p><p><img src="http://editerupload.eepw.com.cn/202207/1658886352406799.png" title="1657802281189088.png" alt="27.png"/></p><p>圖5.升壓-降壓轉(zhuǎn)換器</p><p><br/></p><p><img src="http://editerupload.eepw.com.cn/202207/1658886353352011.png" title="1657802269750164.png" alt="1657802269750164.png" width="680" height="545"/></p><p>圖6.升壓-降壓轉(zhuǎn)換器 LT8386</p><p><br/></p><p><img src="http://editerupload.eepw.com.cn/202207/1658886353112205.png" title="1657802263424545.png" alt="29.png"/></p><p>表3使用升壓-降壓轉(zhuǎn)換器作為L(zhǎng)ED驅(qū)動(dòng)器的優(yōu)勢(shì)和權(quán)衡取舍</p><p><br/></p><p>使用升壓轉(zhuǎn)換器的降壓模式</p><p><br/></p><p>一些升壓LED驅(qū)動(dòng)器可配置為從電源降壓（而不是在標(biāo)準(zhǔn)降壓模式下以地為參考），從而構(gòu)成降壓模式配置。這種配置與降壓模式具有同樣的局限性，即LED串的總電壓必須低于輸入電源電壓。</p><p><br/></p><p><img src="http://editerupload.eepw.com.cn/202207/1658886353979038.png" title="1657802252510150.png" alt="30.png"/></p><p>圖7.降壓模式轉(zhuǎn)換器</p><p><br/></p><p><img src="http://editerupload.eepw.com.cn/202207/1658886354279404.png" title="1657802237786781.png" alt="1657802237786781.png" width="680" height="468"/></p><p>圖8.降壓模式示例: LT3756-2</p><p><br/></p><p><img src="http://editerupload.eepw.com.cn/202207/1658886354974350.png" title="1657802231284511.png" alt="32.png"/></p><p>表4使用降壓模式轉(zhuǎn)換器作為L(zhǎng)ED驅(qū)動(dòng)器的優(yōu)勢(shì)和權(quán)衡取舍</p><p><br/></p><p>降壓-升壓轉(zhuǎn)換器</p><p><br/></p><p>降壓-升壓LED驅(qū)動(dòng)器通過高于或低于LED串總電壓的電源調(diào)節(jié)LED電流。該轉(zhuǎn)換器在降壓模式下調(diào)節(jié)連接到輸入電壓的高壓側(cè)開關(guān)，在升壓模式下調(diào)節(jié)輸出側(cè)的低壓側(cè)開關(guān)。這種拓?fù)浣Y(jié)構(gòu)最復(fù)雜，但也是最靈活的。VIN和VOUT的范圍僅受控制器IC的限制。對(duì)于矩陣型應(yīng)用，這是一種不錯(cuò)的選擇。</p><p><br/></p><p><img src="http://editerupload.eepw.com.cn/202207/1658886354263130.png" title="1657802222876256.png" alt="33.png"/></p><p>圖9.降壓-升壓轉(zhuǎn)換器。</p><p><br/></p><p><img src="http://editerupload.eepw.com.cn/202207/1658886355528460.png" title="1657802210726299.png" alt="1657802210726299.png" width="680" height="307"/></p><p>圖10.降壓升壓示例: LT8391</p><p><br/></p><p><img src="http://editerupload.eepw.com.cn/202207/1658886355604316.png" title="1657802203841357.png" alt="35.png"/></p><p>表5使用降壓-升壓轉(zhuǎn)換器作為L(zhǎng)ED驅(qū)動(dòng)器的優(yōu)勢(shì)和權(quán)衡取舍</p><p><br/></p><p>結(jié)論</p><p><br/></p><p>汽車LED照明系統(tǒng)可通過多種不同的方式使用開關(guān)穩(wěn)壓器驅(qū)動(dòng)。根據(jù)應(yīng)用的不同，照明設(shè)計(jì)人員可通過選擇開關(guān)拓?fù)浜团渲?，針?duì)整個(gè)汽車的不同照明要求，設(shè)計(jì)完整的子系統(tǒng)。為系統(tǒng)選擇正確的功率轉(zhuǎn)換開關(guān)拓?fù)浜团渲每蓛?yōu)化復(fù)雜性、效率、EMI和安全性等要求。</p><p><br/></p></span>  <div class="1661661" 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="1166116" class="hAd8"> <br></span>   </div> </article> <div id="1111166" 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