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<h1>小尺寸兼?zhèn)涓唠妷汗╇姽δ艿膯涡酒?/h1> <div id="sackasa" class="authorTimeSource"> <span>作者：</span> <span>時間：2010-11-22</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="46uiqa8" 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="4k6uguu" 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' 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class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電壓"><em>電壓</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/供電"><em>供電</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/功能"><em>功能</em></a>的<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/單芯片"><em>單芯片</em></a></p>本文引用地址：<a href="http://www.ex-cimer.com/article/180206.htm">http://www.ex-cimer.com/article/180206.htm</a><p>　　摘要：該電路包括磁隔離，允許您配置一個積極的，消極的，或浮動輸出。啟用浮動輸出由一個單獨的繞組，產(chǎn)生一個反饋<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電壓"><em>電壓</em></a>成正比，但比輸出<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電壓"><em>電壓</em></a>低，從而消除了大值電阻器電阻反饋分壓器的需求。</p><p>　　某些傳感器，靜電陷阱和其他應(yīng)用程序需要規(guī)范的高壓電源，提供了一個適度的量的輸出電流。簡單，低靜態(tài)電流，小<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/尺寸"><em>尺寸</em></a>可取的這類用品。圖1的電路符合這些要求，它的磁性隔離輸出允許您配置一個積極的，消極的，或浮動輸出。</p><p>　　圖1。獲取反饋從低電壓二次繞組，這種高電壓產(chǎn)生500V的低靜態(tài)電流。</p><p><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" alt="高電壓供電功能的單芯片 www.elecfans.com" hspace="0" src="http://editerupload.eepw.com.cn/fetch/20131009/180206_1_0.jpg" border="0" style="filter: ; width: 461px; zoom: 1; height: 329px" /></p><p>　　啟用浮動輸出由一個單獨的繞組，產(chǎn)生一個反饋電壓成正比的輸出電壓，但低。這一安排減少了對大值電阻器電阻反饋分壓器，這是否則，如果需要的高電壓(HV)的輸出進行采樣，直接的需要。如圖所示，低電壓分壓器包含值低得多，這耗散更少功率電阻。</p><p>　　一個IC(MAX1605)包含必要的開關(guān)穩(wěn)壓器，調(diào)制器，誤差放大器和電源開關(guān)。它推動了一個環(huán)形變壓器，其中包括一個反饋繞組幾個輸出。隨著元件值如圖所示，該電路可產(chǎn)生500V的。你可以改變輸出電壓±通過調(diào)整電阻反饋分壓器率30%。您還可以增加或減少輸出電壓中的步驟，通過添加或刪除/電容/輸出繞組模塊(BAV21)整流器。輸入電流和輸出電壓的變化如圖所示，輸入電壓(圖2)和負載電流(圖3)。</p><p>　　圖2。輸出電壓(上部跡線)和輸入電流(低跟蹤)與圖1電路的輸入電壓。</p><p><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" height="338" src="http://editerupload.eepw.com.cn/fetch/20131009/180206_1_1.jpg" width="450" border="0" style="zoom: 1" alt="" /></p><p>　　圖3。輸出電壓(上部跡線)和輸入電流(低跡線)與負載了圖1電路的電流。</p><p><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" height="360" src="http://editerupload.eepw.com.cn/fetch/20131009/180206_1_2.jpg" width="450" border="0" style="zoom: 1" alt="" /></p><p>　　至于所有的開關(guān)轉(zhuǎn)換器，電磁干擾和電路寄生可以提出問題。該電路板需要仔細布局，以及濾波，去耦和屏蔽的要求。高壓輸出的1%左右波動。您可以添加一個RC或LC濾波器串聯(lián)的輸出來達到降低輸出紋波。</p></span>  <div class="gsiiasq" 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="akm4swe" class="hAd8"> 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