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href="/info/industry/special/auto">汽車電子</a> > <a href="/info/articlelist/special/auto/type/5">設(shè)計(jì)應(yīng)用</a> > 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="xvtztjp" id="container"> <section> <article> <h1>汽車LED驅(qū)動(dòng)器功率轉(zhuǎn)換拓?fù)渲改?/h1> <div id="nlxrjd9" class="authorTimeSource"> <span>作者：ADI設(shè)計(jì)工程部總監(jiān)Joshua Caldwell</span> <span>時(shí)間：2022-09-19</span> <span>來(lái)源：電子產(chǎn)品世界</span> <link rel="stylesheet" type="text/css"/> <span style="float:right; width:150px;margin-right:0px; text-align:right;"> <div id="nltnvxn" 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="zr9lfhh" 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="pp9lf9f" class="content" id="contentDiv" style="position:relative;"> <div id="vnphlnp" 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;">LED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)，LED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(wèn)題。</p>本文引用地址：<a href="http://www.ex-cimer.com/article/202209/438328.htm">http://www.ex-cimer.com/article/202209/438328.htm</a><p style="text-indent: 2em;">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(guò)半導(dǎo)體結(jié)的精確控制電流來(lái)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(wú)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 style="text-indent: 2em;"><strong>如何為汽車</strong><strong>LED系統(tǒng)選擇正確的開關(guān)拓?fù)?/strong></p><p style="text-indent: 2em;">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 style="text-indent: 2em;"><strong>降壓</strong><strong>(Buck)轉(zhuǎn)換器</strong></p><p style="text-indent: 2em;">降壓LED驅(qū)動(dòng)器通過(guò)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)器可以安全地短接至系統(tǒng)接地，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 style="text-align: center;"><img src="http://editerupload.eepw.com.cn/202209/1663573599438840.png" title="1663573599438840.png" alt="image.png"/></p><p style="text-align: center;"><em>圖1 降壓轉(zhuǎn)換器</em></p><p style="text-align: center;"><img src="http://editerupload.eepw.com.cn/202209/1663573618191623.png" title="1663573618191623.png" alt="1663573618191623.png" width="600" height="444"/></p><p style="text-align: center;"><em>圖2 降壓轉(zhuǎn)換器示例:ADI LT3932</em></p><p style="text-indent: 2em;"><a>降壓</a>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(guò)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 style="text-align: center;"><strong>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</strong></p><table align="center"><tbody><tr style=";height:34px" class="firstRow"><td style="border-top-width: initial; border-style: none solid solid none; border-left-width: initial; border-bottom-width: 1px; border-right-width: 1px; background: rgb(130, 69, 155); padding: 0px;"><p><span style="color: rgb(255, 255, 255);">降壓LED驅(qū)動(dòng)器的優(yōu)點(diǎn)</span></p></td><td style="border-top-width: initial; border-style: none solid solid none; border-left-width: initial; border-bottom-width: 1px; border-right-width: 1px; background: rgb(130, 69, 155); padding: 0px;"><p><span style="color: rgb(255, 255, 255);">降壓LED驅(qū)動(dòng)器的權(quán)衡取舍</span></p></td><td style="border-top-width: initial; border-style: none solid solid none; border-left-width: initial; border-bottom-width: 1px; border-right-width: 1px; background: rgb(130, 69, 155); padding: 0px;"><p><span style="color: rgb(255, 255, 255);">應(yīng)用</span></p></td></tr><tr style=";height:33px"><td style="border-top-width: initial; border-style: none solid solid none; border-left-width: initial; border-bottom-width: 1px; border-right-width: 1px; background: rgb(241, 242, 245); padding: 0px;"><p>接地?zé)舸?底盤回路</p></td><td style="border-top-width: initial; border-style: none solid solid none; border-left-width: initial; border-bottom-width: 1px; border-right-width: 1px; background: rgb(241, 242, 245); padding: 0px;"><p>輸入電壓必須高于LED電壓</p></td><td style="border-top-width: initial; border-style: none solid solid none; border-left-width: initial; border-bottom-width: 1px; border-right-width: 1px; background: rgb(241, 242, 245); padding: 0px;"><p>遠(yuǎn)光燈/近光燈</p></td></tr><tr style=";height:45px"><td style="border-top-width: initial; border-style: none solid solid none; border-left-width: initial; border-bottom-width: 1px; border-right-width: 1px; background: rgb(225, 227, 233); padding: 0px;"><p>矩陣開關(guān)可以并聯(lián)整個(gè)燈串</p></td><td style="border-top-width: initial; border-style: none solid solid none; border-left-width: initial; border-bottom-width: 1px; border-right-width: 1px; background: rgb(225, 227, 233); padding: 0px;"><p>大多數(shù)汽車系統(tǒng)需要預(yù)升壓調(diào)節(jié)器</p></td><td style="border-top-width: initial; border-style: none solid solid none; border-left-width: initial; border-bottom-width: 1px; border-right-width: 1px; background: rgb(225, 227, 233); padding: 0px;"><p>轉(zhuǎn)向燈/動(dòng)畫</p></td></tr><tr style=";height:33px"><td style="border-top-width: initial; border-style: none solid solid none; border-left-width: initial; border-bottom-width: 1px; border-right-width: 1px; background: rgb(241, 242, 245); padding: 0px;"><p>更高的帶寬（>fSW的1/5）</p></td><td style="border-top-width: initial; border-style: none solid solid none; border-left-width: initial; border-bottom-width: 1px; border-right-width: 1px; background: rgb(241, 242, 245); padding: 0px;"><br/></td><td style="border-top-width: initial; border-style: none solid solid none; border-left-width: initial; border-bottom-width: 1px; border-right-width: 1px; background: rgb(241, 242, 245); padding: 0px;"><p>矩陣式前照燈</p></td></tr><tr style=";height:21px"><td style="border-top-width: initial; border-style: none solid solid none; border-left-width: initial; border-bottom-width: 1px; border-right-width: 1px; background: rgb(225, 227, 233); padding: 0px;"><p>出色的EMI性能</p></td><td style="border-top-width: initial; border-style: none solid solid none; border-left-width: initial; border-bottom-width: 1px; border-right-width: 1px; background: rgb(225, 227, 233); padding: 0px;"><br/></td><td style="border-top-width: initial; border-style: none solid solid none; border-left-width: initial; border-bottom-width: 1px; border-right-width: 1px; background: rgb(225, 227, 233); padding: 0px;"><p>短路安全系統(tǒng)</p></td></tr><tr style=";height:21px"><td style="border-top-width: initial; border-style: none solid solid none; border-left-width: initial; border-bottom-width: 1px; border-right-width: 1px; background: rgb(241, 242, 245); padding: 0px;"><p>最小電感尺寸</p></td><td style="border-top-width: initial; border-style: none solid solid none; border-left-width: initial; border-bottom-width: 1px; border-right-width: 1px; background: rgb(241, 242, 245); padding: 0px;"><br/></td><td style="border-top-width: initial; border-style: none solid solid none; border-left-width: initial; border-bottom-width: 1px; border-right-width: 1px; background: rgb(241, 242, 245); padding: 0px;"><br/></td></tr></tbody></table><p style="text-indent: 2em;"><strong>升壓</strong><strong>(BOOST)轉(zhuǎn)換器</strong></p><p style="text-indent: 2em;"><a>升壓</a>LED驅(qū)動(dòng)器通過(guò)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12V汽車系統(tǒng)的工作電壓范圍為6V至18V，這需要將LED驅(qū)動(dòng)器的電壓降到6V，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 style="text-align: center;"><img src="http://editerupload.eepw.com.cn/202209/1663573647813581.png" title="1663573647813581.png" alt="image.png"/></p><p style="text-align: center;"><em>圖3 升壓轉(zhuǎn)換器</em></p><p style="text-align: center;"><img src="http://editerupload.eepw.com.cn/202209/1663573665299728.png" title="1663573665299728.png" alt="1663573665299728.png" width="600" height="342"/></p><p style="text-align: center;"><em>圖4 升壓轉(zhuǎn)換器示例：LT8356-1</em></p><p style="text-align: center;"><strong>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</strong></p><table align="center"><tbody><tr style=";height:34px" class="firstRow"><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(130, 69, 155); padding: 0px;"><p><span style="color: rgb(255, 255, 255);">升壓LED驅(qū)動(dòng)器的優(yōu)勢(shì)</span></p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(130, 69, 155); padding: 0px;"><p><span style="color: rgb(255, 255, 255);">升壓LED驅(qū)動(dòng)器的權(quán)衡取舍</span></p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(130, 69, 155); padding: 0px;"><p><span style="color: rgb(255, 255, 255);">應(yīng)用</span></p></td></tr><tr style=";height:33px"><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(241, 242, 245); padding: 0px;"><p>接地-底盤回路</p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(241, 242, 245); padding: 0px;"><p>輸入電壓必須高于LED電壓</p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(241, 242, 245); padding: 0px;"><p>遠(yuǎn)光燈/近光燈</p></td></tr><tr style=";height:33px"><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(225, 227, 233); padding: 0px;"><p>通常情況下總值最小</p><p>解決方案尺寸</p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(225, 227, 233); padding: 0px;"><p>更低的帶寬（<fSW的1/20）</p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(225, 227, 233); padding: 0px;"><p>平視顯示器</p></td></tr><tr style=";height:33px"><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(241, 242, 245); padding: 0px;"><p>良好的EMI性能</p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(241, 242, 245); padding: 0px;"><p>更高的額定電感電流</p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(241, 242, 245); padding: 0px;"><p>背光</p></td></tr><tr style=";height:33px"><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(225, 227, 233); padding: 0px;"><p>電池直接向LED轉(zhuǎn)換</p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(225, 227, 233); padding: 0px;"><p>無(wú)法將輸出短接到地</p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(225, 227, 233); padding: 0px;"><br/></td></tr></tbody></table><p style="text-indent: 2em;"><strong>使用升壓轉(zhuǎn)換器進(jìn)行升壓-降壓</strong></p><p style="text-indent: 2em;">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 style="text-align: center;"><img src="http://editerupload.eepw.com.cn/202209/1663573702470431.png" title="1663573702470431.png" alt="image.png"/></p><p style="text-align: center;"><em>圖5 升壓-降壓轉(zhuǎn)換器</em></p><p style="text-align: center;"><img src="http://editerupload.eepw.com.cn/202209/1663573718529117.png" title="1663573718529117.png" alt="1663573718529117.png" width="600" height="491"/></p><p style="text-align: center;"><em>圖6 升壓-降壓轉(zhuǎn)換器ADI LT8386</em></p><p style="text-align: center;"><strong>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</strong></p><table align="center"><tbody><tr style=";height:34px" class="firstRow"><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(130, 69, 155); padding: 0px;"><p><span style="color: rgb(255, 255, 255);">升壓-降壓LED驅(qū)動(dòng)器的優(yōu)勢(shì)</span></p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(130, 69, 155); padding: 0px;"><p><span style="color: rgb(255, 255, 255);">升壓-降壓LED驅(qū)動(dòng)器的權(quán)衡取舍</span></p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(130, 69, 155); padding: 0px;"><p><span style="color: rgb(255, 255, 255);">應(yīng)用</span></p></td></tr><tr style=";height:33px"><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(241, 242, 245); padding: 0px;"><p>電池直接向LED轉(zhuǎn)換</p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(241, 242, 245); padding: 0px;"><p>效率較低</p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(241, 242, 245); padding: 0px;"><p>遠(yuǎn)光燈/近光燈</p></td></tr><tr style=";height:33px"><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(225, 227, 233); padding: 0px;"><p>LED電壓可能高于或低于電源電壓</p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(225, 227, 233); padding: 0px;"><p>更低的帶寬（<fSW的1/20）</p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(225, 227, 233); padding: 0px;"><p>轉(zhuǎn)向燈</p></td></tr><tr style=";height:33px"><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(241, 242, 245); padding: 0px;"><p>良好的EMI性能</p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(241, 242, 245); padding: 0px;"><p>更高的額定電感電流</p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(241, 242, 245); padding: 0px;"><p>日間行車燈</p></td></tr><tr style=";height:33px"><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(225, 227, 233); padding: 0px;"><p>可使用矩陣來(lái)短接整個(gè)燈串</p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(225, 227, 233); padding: 0px;"><p>無(wú)法將輸出短接到地</p></td><td style="border: 1px solid rgb(221, 221, 221); background: rgb(225, 227, 233); padding: 0px;"><p>同一輸出上有多個(gè)燈串</p></td></tr></tbody></table><p style="text-indent: 2em;"><strong>使用升壓轉(zhuǎn)換器的降壓模式</strong></p><p style="text-indent: 2em;">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 style="text-align: center;"><img src="http://editerupload.eepw.com.cn/202209/1663573750609892.png" title="1663573750609892.png" alt="image.png"/></p><p style="text-align: center;"><em>圖7 降壓模式轉(zhuǎn)換器</em></p><p style="text-align: center;"><img src="http://editerupload.eepw.com.cn/202209/1663573764306889.png" title="1663573764306889.png" alt="1663573764306889.png" width="600" height="412"/></p><p style="text-align: center;"><em>圖8 降壓模式示例:ADI LT3756-2</em></p><p style="text-align: center;"><strong>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</strong></p><table align="center"><tbody><tr style=";height:34px" class="firstRow"><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(130, 69, 155); padding: 0px;"><p><span style="color: rgb(255, 255, 255);">降壓模式LED驅(qū)動(dòng)器的優(yōu)勢(shì)</span></p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(130, 69, 155); padding: 0px;"><p><span style="color: rgb(255, 255, 255);">降壓模式LED驅(qū)動(dòng)器的權(quán)衡取舍</span></p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(130, 69, 155); padding: 0px;"><p><span style="color: rgb(255, 255, 255);">應(yīng)用</span></p></td></tr><tr style=";height:33px"><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(241, 242, 245); padding: 0px;"><p>良好的EMI性能</p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(241, 242, 245); padding: 0px;"><p>輸入電壓必須高于LED電壓</p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(241, 242, 245); padding: 0px;"><p>遠(yuǎn)光燈/近光燈</p></td></tr><tr style=";height:45px"><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(225, 227, 233); padding: 0px;"><p>可使用矩陣來(lái)短接整個(gè)燈串</p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(225, 227, 233); padding: 0px;"><p>大多數(shù)汽車系統(tǒng)需要預(yù)升壓調(diào)節(jié)器</p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(225, 227, 233); padding: 0px;"><p>轉(zhuǎn)向燈</p></td></tr><tr style=";height:33px"><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(241, 242, 245); padding: 0px;"><p>可將同一驅(qū)動(dòng)器用于多種應(yīng)用</p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(241, 242, 245); padding: 0px;"><p>無(wú)法將輸出（LED陰極）短接到地</p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(241, 242, 245); padding: 0px;"><p>日間行車燈</p></td></tr></tbody></table><p style="text-indent: 2em;"><strong>降壓-升壓轉(zhuǎn)換器</strong></p><p style="text-indent: 2em;">降壓-升壓LED驅(qū)動(dòng)器通過(guò)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 style="text-align: center;"><img src="http://editerupload.eepw.com.cn/202209/1663573785272763.png" title="1663573785272763.png" alt="image.png"/></p><p style="text-align: center;"><em>圖9 降壓-升壓轉(zhuǎn)換器</em></p><p style="text-align: center;"><img src="http://editerupload.eepw.com.cn/202209/1663573809255185.png" title="1663573809255185.png" alt="1663573809255185.png" width="600" height="269"/></p><p style="text-align: center;"><em>圖10 降壓升壓示例: LT8391</em></p><p style="text-align: center;"><strong>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</strong></p><table align="center"><tbody><tr style=";height:34px" class="firstRow"><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(130, 69, 155); padding: 0px;"><p><span style="color: rgb(255, 255, 255);">降壓-升壓LED驅(qū)動(dòng)器的優(yōu)勢(shì)</span></p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(130, 69, 155); padding: 0px;"><p><span style="color: rgb(255, 255, 255);">降壓-升壓LED驅(qū)動(dòng)器的權(quán)衡取舍</span></p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(130, 69, 155); padding: 0px;"><p><span style="color: rgb(255, 255, 255);">應(yīng)用</span></p></td></tr><tr style=";height:45px"><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(241, 242, 245); padding: 0px;"><p>最通用的拓?fù)?/p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(241, 242, 245); padding: 0px;"><p>至少需要兩個(gè)開關(guān)和兩個(gè)續(xù)流二極管</p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(241, 242, 245); padding: 0px;"><p>遠(yuǎn)光燈/近光燈</p></td></tr><tr style=";height:33px"><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(225, 227, 233); padding: 0px;"><p>可使用矩陣來(lái)短接整個(gè)燈串</p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(225, 227, 233); padding: 0px;"><p>通常情況下，轉(zhuǎn)換效率最低</p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(225, 227, 233); padding: 0px;"><p>轉(zhuǎn)向燈</p></td></tr><tr style=";height:33px"><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(241, 242, 245); padding: 0px;"><p>可將同一驅(qū)動(dòng)器用于多種應(yīng)用</p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(241, 242, 245); padding: 0px;"><p>通常情況下，EMI性能最低（差）</p></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(241, 242, 245); padding: 0px;"><p>日間行車燈</p></td></tr><tr style=";height:21px"><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(225, 227, 233); padding: 0px;"><br/></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(225, 227, 233); padding: 0px;"><br/></td><td style="border-width: 1px; border-style: solid; border-color: rgb(221, 221, 221); background: rgb(225, 227, 233); padding: 0px;"><p>短路安全系統(tǒng)</p></td></tr></tbody></table><p style="text-indent: 2em;"><strong>結(jié)論</strong></p><p style="text-indent: 2em;">汽車LED照明系統(tǒng)可通過(guò)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(guò)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)。顯然，為系統(tǒng)選擇正確的功率轉(zhuǎn)換開關(guān)拓?fù)浜团渲?，無(wú)疑會(huì)優(yōu)化復(fù)雜性、效率、EMI和安全性等要求。</p><p style="text-indent: 2em;"><strong>關(guān)于作者</strong></p><p style="text-indent: 2em;">Josh Caldwell曾在凌力爾特（現(xiàn)在為ADI公司的一部分）工作了10年，目前擔(dān)任設(shè)計(jì)工程部門主管，負(fù)責(zé)單芯片降壓、升壓和控制器LED驅(qū)動(dòng)器的定義、設(shè)計(jì)和開發(fā)工作。他擁有科羅拉多大學(xué)電氣工程學(xué)士學(xué)位。業(yè)余時(shí)間，他喜歡騎自行車和繪畫。</p></span>  <div class="llpvpft" 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 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