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width:130px;margin-right:0px; text-align:right;"> <div id="7hlpbrn" 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 />和技術大咖面對面交流<br />海量資料庫查詢</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="9bfrn99" 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="vdxtxnz" class="content" id="contentDiv" style="position:relative;"> <div id="frdz9rb" 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>今天，<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/LED"><em>LED</em></a>照明將成為主流技術。技術的成熟，眾多功能之一<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/LED"><em>LED</em></a>照明標準和法規(guī)已提出。嚴格的效率要求已經存在很長一段時間，并會繼續(xù)增長。但最近，<strong><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/LED"><em>LED</em></a>照明</strong>設計師的作品是比較困難的，因為要滿足兩個要求：白熾燈<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/調光"><em>調光</em></a>器<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/調光"><em>調光</em></a>控制使用來實現(xiàn)，并實現(xiàn)高功率因數(shù)LED<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/調光"><em>調光</em></a>性能，電流-模擬調光和PLEDzatemneniemdelenie有關情況介紹如下。</p>本文引用地址：<a href="http://www.ex-cimer.com/article/200344.htm">http://www.ex-cimer.com/article/200344.htm</a><p>隨著LED的應用市場將繼續(xù)快速增長，LED的產品范圍的不斷增長，增加高端產品的需求上顯示的LED亮度控制功能也是十分必要的。出席會議的，例如，LED燈及顯示器等應該注意的環(huán)節(jié)。</p><p>調光是照明系統(tǒng)非常常見的功能。對于白熾燈來說，它可以以低成本輕易實現(xiàn)。LED<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/燈具"><em>燈具</em></a>的調光卻存在一定難度，但對于建筑師和住宅用戶來說，在轉換到LED照明時可不愿失去調光控制應有的優(yōu)勢。這就涉及到LED照明類的許多相關知識。</p><p>功率因數(shù)是非常重要的因素，因為高功率因數(shù)可降低配電網絡的損耗。降低電力使用對環(huán)境所造成影響的最有效方式是減少浪費，因此世界各地的監(jiān)管機構都在進一步嚴格他們的功率因數(shù)規(guī)范。其中一個例子就是能源之星固態(tài)照明能效規(guī)范(09/12/07)，它規(guī)定住宅照明產品的功率因數(shù)(PF)應大于0.7，商用照明產品的功率因數(shù)(PF)應大于0.9。</p><p><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/燈具"><em>燈具</em></a>的調光方法最主要、常見的有三種，這三種調光<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/技能"><em>技能</em></a>都是根據LED驅動電流輸入的變化來進行調光的。按照不同的電路系統(tǒng)也能夠分為模仿調光和PWM調光。</p><p>第一種：這種調光方法為通過調制LED驅動電流來完成LED燈的調光，由于LED芯片的亮度與LED驅動電流成一定的比例干系，所以我們調節(jié)LED驅動電流就可以控制LED燈的明暗。</p><p>第二種：這種調光方法稱之為脈沖寬度調制(PWM)。該種方法是經過調節(jié)使驅動電流呈方波狀，其脈沖寬度可變，經過對脈沖寬度的調制轉變?yōu)檎{制LED燈連續(xù)點亮的時間，也同時轉變了輸入功率，從而到達節(jié)能、調光的目標。頻率跟平常一樣大概在200Hz~10KHz；因為人的眼睛視覺的滯后性，不會感覺得到光源在調光過程中產生的閃耀現(xiàn)象。此種調光方法的好處是能改善LED的散熱性能，缺陷是驅動電流的過沖對LED芯片的壽命肯定有一定的影響中國<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/燈具"><em>燈具</em></a>之鄉(xiāng)”余姚地區(qū)燈具企業(yè)依托本地產業(yè)優(yōu)勢，充分借力“節(jié)能環(huán)保”特色，在產品的設計開發(fā)中大打“節(jié)能”牌，不斷應用新型節(jié)能環(huán)保技術開發(fā)產品以適應市場需求。據統(tǒng)計，今年前四月余姚出口節(jié)能燈具2230批次，貨值5006萬美元，同比分別增長32.5%和18.4%，…。</p><p>第三：這種方法稱為模仿停電停電停電或直線法metod.Vid調光方法的優(yōu)點在于當驅動電流線性增長或下降，減少過程中的LED芯片壽命的驅動電流的排放量，著色計劃較強的抗nepriyatnost.Nedostatkom是磁盤的大小目前的變化過程，當然，在一定程度的LED芯片的色溫。</p></span>  <div class="1h9fhz9" 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="9v9p991" class="hAd8"> <p><strong><span style="font-family:宋體;font-size:14px;"><strong><strong><span 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