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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> > 為節(jié)能式電源選擇正確的拓?fù)?/p> </div> </div> </div>   <script src="https://forum.eepw.com.cn/jscontent/wenzilian" type="text/javascript"></script>  <div class="cudpflc" id="container"> <section> <article> <h1>為節(jié)能式電源選擇正確的拓?fù)?/h1> <div id="nxyoenl" class="authorTimeSource"> <span>作者：</span> <span>時(shí)間：2010-05-06</span> <span>來(lái)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="ediyoir" 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="zysiapu" 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="rjztnev" class="content" id="contentDiv" style="position:relative;"> <div id="tdijdfd" 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>世界各地有關(guān)降低電子系統(tǒng)能耗的各種倡議，正促使單相交流輸入<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電源"><em>電源</em></a>設(shè)計(jì)人員采用更先進(jìn)的<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電源"><em>電源</em></a>技術(shù)。為了獲得更高的功率級(jí)，這些倡議要求效率達(dá)到87% 及以上。由于標(biāo)準(zhǔn)反激式 (flyback) 和雙開(kāi)關(guān)正激式等傳統(tǒng)<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電源"><em>電源</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/拓?fù)?><em>拓?fù)?/em></a>都不支持這些高效率級(jí)，所以正逐漸被軟開(kāi)關(guān)諧振和準(zhǔn)諧振<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/拓?fù)?><em>拓?fù)?/em></a>所取代。<br /></p>本文引用地址：<a href="http://www.ex-cimer.com/article/180874.htm">http://www.ex-cimer.com/article/180874.htm</a><p><b>工作原理</b><br /></p><p>圖1所示為采用三種不同<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/拓?fù)?><em>拓?fù)?/em></a> (準(zhǔn)諧振反激式拓?fù)?、LLC諧振拓?fù)浜褪褂密涢_(kāi)關(guān)技術(shù)的非對(duì)稱半橋拓?fù)? 的開(kāi)關(guān)的電壓和電流波形。<br /></p><div><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" style="FLOAT: none; BORDER-TOP-STYLE: none; ZOOM: 1; BORDER-RIGHT-STYLE: none; BORDER-LEFT-STYLE: none; BORDER-BOTTOM-STYLE: none" height="244" src="http://editerupload.eepw.com.cn/fetch/20131009/180874_1_0.jpg" width="450" /><br /></div><p style="TEXT-ALIGN: center">圖1：準(zhǔn)諧振、LLC和非對(duì)稱半橋拓?fù)涞谋容^</p><p>輸出二極管電流降至零<br /></p><p>當(dāng)初級(jí)端耦合回次級(jí)端時(shí)的斜坡變化<br /></p><p>體二極管導(dǎo)通，直到MOSFET導(dǎo)通<br /></p><p style="TEXT-ALIGN: center" done0="11"><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" style="FLOAT: none; BORDER-TOP-STYLE: none; ZOOM: 1; BORDER-RIGHT-STYLE: none; BORDER-LEFT-STYLE: none; BORDER-BOTTOM-STYLE: none" height="85" src="http://editerupload.eepw.com.cn/fetch/20131009/180874_1_1.jpg" width="450" /><br /></p><br /><p><br /></p><p>這三種拓?fù)洳捎昧瞬煌募夹g(shù)來(lái)降低MOSFET的開(kāi)通損耗，導(dǎo)通損耗的計(jì)算公式如下：<br /></p><p style="TEXT-ALIGN: center" done0="10"><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" style="FLOAT: none; BORDER-TOP-STYLE: none; ZOOM: 1; BORDER-RIGHT-STYLE: none; BORDER-LEFT-STYLE: none; BORDER-BOTTOM-STYLE: none" height="42" src="http://editerupload.eepw.com.cn/fetch/20131009/180874_1_2.jpg" width="297" /><br /></p><p>在這一公式中，ID 為剛導(dǎo)通后的漏電流， VDS 為開(kāi)關(guān)上的電壓， COSSeff 為等效輸出電容值(包括雜散電容效應(yīng))，tON 為導(dǎo)通時(shí)間，fSW 為開(kāi)關(guān)頻率。.<br /></p><p>如圖1所示，準(zhǔn)諧振拓?fù)渲械?MOSFET 在剛導(dǎo)通時(shí)漏極電流為零，因?yàn)檫@種轉(zhuǎn)換器工作在不連續(xù)傳導(dǎo)模式下，故開(kāi)關(guān)損耗由導(dǎo)通時(shí)的電壓和開(kāi)關(guān)頻率決定。準(zhǔn)諧振轉(zhuǎn)換器在漏電壓最小時(shí)導(dǎo)通，從而降低開(kāi)關(guān)損耗。這意味著開(kāi)關(guān)頻率不恒定：在負(fù)載較輕時(shí)，第一個(gè)最小漏電壓來(lái)得比較早。以往的設(shè)計(jì)總是在第一個(gè)最小值時(shí)導(dǎo)通，輕負(fù)載下的效率隨開(kāi)關(guān)頻率的增加而降低，抵消了導(dǎo)通電壓較低的優(yōu)點(diǎn)。在飛兆半導(dǎo)體的e-Series 準(zhǔn)諧振電源開(kāi)關(guān)中，控制器只需等待最短時(shí)間 (從而設(shè)置頻率上限)，然后在下一個(gè)最小值時(shí)導(dǎo)通 MOSFET。<br /></p><p>其它拓?fù)涠疾捎昧汶妷洪_(kāi)關(guān)技術(shù)。在這種情況下，上面公式里的電壓VDS將從一般約400V的總線電壓降至1V左右，這有效地消除了導(dǎo)通開(kāi)關(guān)損耗。通過(guò)讓電流反向經(jīng)體二極管流過(guò)MOSFET，再導(dǎo)通MOSFET，可實(shí)現(xiàn)零電壓開(kāi)關(guān)。二極管的壓降一般約為1V。<br /></p><p>諧振轉(zhuǎn)換器通過(guò)產(chǎn)生滯后于電壓波形相位的正弦電流波形來(lái)實(shí)現(xiàn)零電壓開(kāi)關(guān)，而這需要在諧振網(wǎng)絡(luò)上加載方波電壓，該電壓的基頻分量促使正弦電流流動(dòng) (更高階分量一般可忽略)。通過(guò)諧振，電流滯后于電壓，從而實(shí)現(xiàn)零電壓開(kāi)關(guān)。諧振網(wǎng)絡(luò)的輸出通過(guò)整流提供DC輸出電壓，最常見(jiàn)的諧振網(wǎng)絡(luò)由一個(gè)帶特殊磁化電感的變壓器、一個(gè)額外的電感和一個(gè)電容構(gòu)成，故名曰LLC。<br /></p><p>非對(duì)稱半橋轉(zhuǎn)換器則是通過(guò)軟開(kāi)關(guān)技術(shù)來(lái)實(shí)現(xiàn)零電壓開(kāi)關(guān)。這里，橋產(chǎn)生的電壓為矩形波，占空比遠(yuǎn)低于50%。在把這個(gè)電壓加載到變壓器上之前，需要一個(gè)耦合電容來(lái)消除其中的DC分量，而該電容還作為額外的能量存儲(chǔ)單元。當(dāng)兩個(gè)MOSFET都被關(guān)斷時(shí)，變壓器的漏電感中的能量促使半橋的電壓極性反轉(zhuǎn)。這種電壓擺幅最終被突然出現(xiàn)初級(jí)電流的相關(guān)MOSFET體二極管鉗制。<br /></p><p><b><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/選擇"><em>選擇</em></a>標(biāo)準(zhǔn)</b><br /></p><p>這些能源優(yōu)化方面的成果帶來(lái)了出色的效率。對(duì)于75W/24V的電源，準(zhǔn)諧振轉(zhuǎn)換器設(shè)計(jì)可以獲得超過(guò)88%的效率。利用同步整流 (加上額外的模擬控制器和一個(gè)PFC前端)，更有可能在90W/19V電源下把效率提高到90% 以上。在該功率級(jí)，雖然LLC諧振和非對(duì)稱半橋轉(zhuǎn)換器可獲得更高的效率，但由于這兩種方案的實(shí)現(xiàn)成本較高，所以這個(gè)功率范圍普遍采用準(zhǔn)諧振轉(zhuǎn)換器。對(duì)于從1W輔助電源到30W機(jī)頂盒電源乃至50W的工業(yè)電源的應(yīng)用范圍，e-Series集成式電源開(kāi)關(guān)系列都十分有效。在此功率級(jí)之上，建議使用帶外部MOSFET的FAN6300準(zhǔn)諧振控制器，它可以提供處理超高系統(tǒng)輸入電壓的額外靈活性，此外，由于外部MOSFET的<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/選擇"><em>選擇</em></a>范圍廣泛而有助于優(yōu)化性價(jià)比。<br /></p><p>準(zhǔn)諧振反激式拓?fù)涫褂靡粋€(gè)低端MOSFET；而另外兩種拓?fù)湓谝粋€(gè)半橋結(jié)構(gòu)中需要兩個(gè)MOSFET。因此，在功率級(jí)較低時(shí)，準(zhǔn)諧振反激式是最具成本優(yōu)勢(shì)的拓?fù)?。在功率?jí)較高時(shí)，變壓器的尺寸增加，效率和功率密度下降，這時(shí)往往考慮采用兩種零電壓開(kāi)關(guān)拓?fù)洹?br /></p><p>系統(tǒng)設(shè)計(jì)會(huì)受到四個(gè)因素所影響：分別是輸入電壓范圍、輸出電壓、是否易于實(shí)現(xiàn)同步整流，以及漏電感的實(shí)現(xiàn)。</p><p>圖2比較了兩種拓?fù)涞脑鲆媲€。為便于說(shuō)明，我們假設(shè)需要支持的輸入電壓為110V 和 220V。對(duì)于非對(duì)稱半橋拓?fù)?，這不是問(wèn)題。在我們?cè)O(shè)定的工作條件下，220V 和110V 時(shí)其增益分別為0.2和0.4 。在220V時(shí)，效率較低，因?yàn)榇呕疍C電流隨占空比減小而增大。對(duì)于LLC諧振轉(zhuǎn)換器來(lái)說(shuō)，最大增益為1.2，要注意的是滿負(fù)載曲線非常接近諧振。0.6的增益將導(dǎo)致頻率極高，系統(tǒng)性能很差?？傃灾?，LLC 轉(zhuǎn)換器不適合于較寬的工作范圍。通過(guò)對(duì)漏電感進(jìn)行外部調(diào)節(jié)，LLC 轉(zhuǎn)換器可以用于歐洲的輸入范圍，但代價(jià)是磁化電流較大；若采用了PFC前端，它的工作最佳。而非對(duì)稱半橋結(jié)構(gòu)在輸入端帶有PFC級(jí)，因此電路可工作在很寬的輸入電壓范圍上。<br /></p><div><img onload="if(this.width>620)this.width=620;" 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target="_blank">濾波器</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/CAN總線" title="CAN總線" target="_blank">CAN總線</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/開(kāi)關(guān)電源" title="開(kāi)關(guān)電源" target="_blank">開(kāi)關(guān)電源</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/單片機(jī)" title="單片機(jī)" target="_blank">單片機(jī)</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/PCB" title="PCB" target="_blank">PCB</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/USB" title="USB" target="_blank">USB</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/ARM" title="ARM" target="_blank">ARM</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/CPLD" title="CPLD" target="_blank">CPLD</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/連接器" title="連接器" target="_blank">連接器</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/MEMS" title="MEMS" target="_blank">MEMS</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/CMOS" title="CMOS" target="_blank">CMOS</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/MIPS" title="MIPS" target="_blank">MIPS</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/EMC" title="EMC" target="_blank">EMC</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/EDA" title="EDA" target="_blank">EDA</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/ROM" title="ROM" target="_blank">ROM</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/陀螺儀" title="陀螺儀" target="_blank">陀螺儀</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/VHDL" title="VHDL" target="_blank">VHDL</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/比較器" title="比較器" target="_blank">比較器</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/Verilog" title="Verilog" target="_blank">Verilog</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/穩(wěn)壓電源" title="穩(wěn)壓電源" target="_blank">穩(wěn)壓電源</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/RAM" title="RAM" target="_blank">RAM</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/AVR" title="AVR" target="_blank">AVR</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/傳感器" title="傳感器" target="_blank">傳感器</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/可控硅" title="可控硅" target="_blank">可控硅</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/IGBT" title="IGBT" target="_blank">IGBT</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/嵌入式開(kāi)發(fā)" title="嵌入式開(kāi)發(fā)" target="_blank">嵌入式開(kāi)發(fā)</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/逆變器" title="逆變器" target="_blank">逆變器</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/Quartus" title="Quartus" target="_blank">Quartus</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/RS-232" title="RS-232" target="_blank">RS-232</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/Cyclone" title="Cyclone" target="_blank">Cyclone</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/電位器" title="電位器" target="_blank">電位器</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/電機(jī)控制" title="電機(jī)控制" target="_blank">電機(jī)控制</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/藍(lán)牙" title="藍(lán)牙" target="_blank">藍(lán)牙</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/PLC" title="PLC" target="_blank">PLC</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/PWM" title="PWM" target="_blank">PWM</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/汽車電子" title="汽車電子" target="_blank">汽車電子</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/轉(zhuǎn)換器" title="轉(zhuǎn)換器" target="_blank">轉(zhuǎn)換器</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/電源管理" title="電源管理" target="_blank">電源管理</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/信號(hào)放大器" title="信號(hào)放大器" target="_blank">信號(hào)放大器</a></li> </ul> </div>  </div>  <script> //先得到cookie function getCookie(cookie_name) { var allcookies = document.cookie; var cookie_pos = allcookies.indexOf(cookie_name); // 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