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src="https://forum.eepw.com.cn/jscontent/wenzilian" type="text/javascript"></script>  <div class="wkjdfhr" id="container"> <section> <article> <h1>一種新型LED顯示模組供電拓?fù)?/h1> <div id="qdjtgbp" class="authorTimeSource"> <span>作者：</span> <span>時(shí)間：2010-11-17</span> <span>來(lái)源：網(wǎng)絡(luò)</span> <link rel="stylesheet" type="text/css"/> <span style="float:right; width:130px;margin-right:0px; text-align:right;"> <div id="nizpjih" 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="hravmlv" 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="kgpgxsk" class="content" id="contentDiv" style="position:relative;"> <div id="nuedsqx" 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>摘要：設(shè)計(jì)了一種LED顯示屏模組的全新的<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電源"><em>電源</em></a>供電拓?fù)洹?20 V／50 Hz(或110V／60HZ)交流<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電源"><em>電源</em></a>經(jīng)過(guò)濾波、整流、PFC矯正后產(chǎn)生一個(gè)400V的電壓；400V的電壓通過(guò)總線傳輸?shù)侥＝M內(nèi)的輔助<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電源"><em>電源</em></a>模塊和多個(gè)高效電源模塊；輔助電源模塊接收控制命令開(kāi)關(guān)PFC電路和高效電源模塊，并給小信號(hào)電路提供電能；高效電源模塊再將400 V的電壓轉(zhuǎn)換成LED點(diǎn)陣模塊所需電壓。這種拓?fù)涔╇娛筁ED顯示模組的電磁兼容符合相關(guān)的標(biāo)準(zhǔn)規(guī)定限值(GBl7625．1-2003或兼容IECl000-3-2)，模組PF值可以達(dá)到98％以上；同時(shí)，LED顯示屏的整個(gè)電能的轉(zhuǎn)換效率可以達(dá)到82％以上，與傳統(tǒng)拓?fù)湎啾葴p少了整個(gè)顯示屏功耗。<br />關(guān)鍵詞：開(kāi)關(guān)電源模塊；諧波；總諧波失真；有源；無(wú)源；功率因數(shù)矯正；NCPl653；NCPl207<br /><br /><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/ LED"><em> LED</em></a>全彩顯示屏是一種新型的室內(nèi)外大尺寸的電子傳播媒體，具有尺寸大、環(huán)境適應(yīng)性好、亮度高、動(dòng)態(tài)播放等特點(diǎn)。隨著LED性價(jià)比的進(jìn)一步提高，它可廣泛應(yīng)用于廣告、舞臺(tái)、招牌、交通設(shè)施、公眾場(chǎng)所等領(lǐng)域。LED作為一種新興的發(fā)光器件，具有公認(rèn)節(jié)能特點(diǎn)。但是，由大量LED燈管組成的LED全彩顯示屏應(yīng)用卻耗能巨大；同時(shí)，大量LED模組構(gòu)成LED顯示屏，而LED模組內(nèi)是由若干的開(kāi)關(guān)電源供電，這種大量傳統(tǒng)開(kāi)關(guān)電源(不帶PFC矯正)產(chǎn)生的諧波失真很容易污染公共電網(wǎng)；所以，電磁兼容性和低能耗設(shè)計(jì)是LED顯示屏技術(shù)一個(gè)重要的發(fā)展方向。<br /><br />1<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/ LED"><em> LED</em></a>顯示屏模組的供電拓?fù)浣Y(jié)構(gòu)<br /> 采用傳統(tǒng)的全彩LED顯示屏模組拓?fù)浼軜?gòu)供電(不帶PFC矯正)，諧波失真對(duì)電網(wǎng)的影響非常嚴(yán)重。通過(guò)工程部門(mén)對(duì)多項(xiàng)實(shí)際工程的觀測(cè)，LED顯示屏系統(tǒng)對(duì)供電網(wǎng)絡(luò)的影響主要有：1)主要諧波電流為3／5／7／9／11次；2)諧波疊加后，造成系統(tǒng)綜合功率因素低下，通常低于0.75，遠(yuǎn)遠(yuǎn)低于國(guó)家標(biāo)準(zhǔn)的要求；3)電壓電流波形畸變嚴(yán)重，不是標(biāo)準(zhǔn)的正弦波形。諧波失真可能對(duì)電網(wǎng)上其他敏感設(shè)備造成不良影響，甚至使其工作異常，帶來(lái)關(guān)聯(lián)的法律責(zé)任問(wèn)題，例如，諧波導(dǎo)致同樓中某公司的網(wǎng)絡(luò)服務(wù)器因突然停電，造成損失。所以，全彩LED顯示屏模組的電源供電拓?fù)浣Y(jié)構(gòu)，采用PFC的技術(shù)是大勢(shì)所趨，是整個(gè)行業(yè)技術(shù)升級(jí)的必然結(jié)果。<br /> 如圖1所示，傳統(tǒng)的全彩LED顯示屏的電源供電拓?fù)湟话闶遣捎萌舾蓚€(gè)(m個(gè))開(kāi)關(guān)電源的并聯(lián)輸出，然后采用5 V的直流總線的方式給LED點(diǎn)陣模塊進(jìn)行供電。譬如，一個(gè)靜態(tài)的P16全彩LED模組，一般使用4個(gè)標(biāo)準(zhǔn)電源S-350-5，并在5 V輸出端采用并聯(lián)方式組成供電總線，然后各個(gè)LED點(diǎn)陣模塊分別通過(guò)總線分支取電。這種總線供電方式，使得5 V電源在傳輸?shù)絃ED器件過(guò)程中，消耗電能浪費(fèi)。通常，5 V直流電總線的電流比較大，在傳輸?shù)倪^(guò)程中，部分電能通過(guò)傳輸線阻變成了熱量(P=(ILED)2R線)，散發(fā)到環(huán)境中。另一方面，受負(fù)載變化(像素點(diǎn)信號(hào)的變化)，LED導(dǎo)通電流也變化，根據(jù)分壓原理：VLED=5 V-(ILEDR線)，雖然開(kāi)關(guān)電源模塊S-350-5輸出5 V+1％、但是傳輸?shù)絃ED點(diǎn)陣模塊部分的電壓卻是一個(gè)變化的電壓值，并且隨著LED電流ILED變化越大，傳輸?shù)絃ED點(diǎn)陣模塊的電壓值也變化越大。當(dāng)負(fù)載電流增大到一定值后，傳輸?shù)絃ED像素點(diǎn)電壓可能低于LED的完全導(dǎo)通的必須電壓值，甚至于影響LED大屏幕的正常顯示功能。</p>本文引用地址：<a href="http://www.ex-cimer.com/article/169149.htm">http://www.ex-cimer.com/article/169149.htm</a><p><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" height="376" alt="a.JPG" width="350" border="0" src="http://editerupload.eepw.com.cn/fetch/20130906/169149_1_0.jpg" /><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" height="393" alt="b.JPG" width="450" border="0" src="http://editerupload.eepw.com.cn/fetch/20130906/169149_1_1.jpg" /></p><p><br /> 經(jīng)過(guò)眾多實(shí)驗(yàn)數(shù)據(jù)分析，為了克服傳統(tǒng)顯示屏模組的諸多缺點(diǎn)，提出了一種全新的LED顯示屏模組的供電拓?fù)浣Y(jié)構(gòu)，如圖2所示。該拓?fù)浣Y(jié)構(gòu)包括：<br /> 1)交流輸入端采用一個(gè)公共的交流濾波和PFC矯正電路，產(chǎn)生400 V的直流電壓，然后400 V直流電壓通過(guò)模組內(nèi)電源總線傳輸能量；因?yàn)椴捎昧?00 V的直流電源傳輸，所以在整個(gè)傳輸總線上的電流較小。譬如，一個(gè)P16(像素點(diǎn)間距是16mm)的LED顯示屏模組的電源功率需要輸入400W，那么在400 V直流總線上傳輸?shù)碾娏髦挥? A，而總線上的線阻只有0．1 Ω，計(jì)算傳輸?shù)膿p耗只有O．01 W，可忽略不計(jì)。<br /> 2)輔助開(kāi)關(guān)電源模塊，該供電模塊也是從400 V電源總線中提取能量。經(jīng)過(guò)變換提供+5 V直流電源給模組的信號(hào)控制模塊供電．提供+12 V直流電源給模組的各種輔助電路(電氣檢測(cè)電路、溫濕度檢測(cè)電路、環(huán)境亮度檢測(cè)電路，降溫舉措電路等)供電，并且該輔助電源模塊還支持通信接口與信號(hào)處理電路接口，用于控制PFC電路及其他開(kāi)關(guān)電源模塊的啟動(dòng)和關(guān)閉。這樣有助于整個(gè)LED顯示系統(tǒng)的智能化管理。<br /> 3)若干分布在模組內(nèi)的小型開(kāi)關(guān)電源，這些開(kāi)關(guān)電源從400 V直流總線上取得必要的電能，然后有效地變換輸出LED點(diǎn)陣模塊所需的供電電壓(VrVg和Vb)；因?yàn)椴捎眉t綠藍(lán)3路分別供電的拓?fù)浣Y(jié)構(gòu)，可以根據(jù)輸出的LED器件的實(shí)際所需電壓要求來(lái)設(shè)置特定電壓輸出值。所以，這種供電方式可以給LED點(diǎn)陣模塊提供更穩(wěn)定可靠的電源，為高品質(zhì)的LED顯示提供保證。</p><p></span>  <div class="epvtcmw" 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" 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