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id="d7ld9ce" class="proBig"><div id="lxjdrl8" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/shxiansheng/637269781569589844/2953538.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="f2okelv" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/shxiansheng/637269781569589844/2953538.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="nol3wyb" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>上海市</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>廣東大功率投光燈廠家,投光燈</p><p><span>***更新：</span>2021-01-24 07:07:26</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="lp732sk" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">上海先盛照明電器有限公司</a></p><p><span>聯(lián)系人：</span>顧勇軍</p><p><span>郵箱: </span>522366548@qq.com</p><p><span>電話: </span>13301861712</p><p><span>傳真: </span>021_</p><p><span>網(wǎng)址: </span></p><p><span>手機: </span>021-54169416</p><p><span>地址: </span>陶干路1199號</p><p>[當前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="klnxe8w" class="page-proshow02"><p class="title">詳細說明</p><div id="2pw78gn" class="box"><p><p style="text-indent:25px">LED的發(fā)光亮度正比于PWM的脈沖占空比，在這種調(diào)光控制方法下，可以在高度調(diào)光比范圍內(nèi)保持LED的發(fā)光顏色不變，采用PWM的LED調(diào)光控制的調(diào)光比范圍可達3000: 1。線性 LED調(diào)光控制方法就是采用模擬調(diào)光控制方法，在模擬調(diào)光控制下，通過調(diào)節(jié)LED的正向工作電流來實現(xiàn)LED的調(diào)光控制，調(diào)光控制范圍可達10:1。如果要進一步降低LED的正向工作電流則會產(chǎn)生LED發(fā)光顏色發(fā)生變化和不能準確調(diào)節(jié)控制LED的正向工作電流的問題。運作參數(shù)和效率 - -般zui常見的LED工作功率都是設(shè)定于30至60毫瓦電能以下。衰減特性除與紅，廣東大功率投光燈廠家、綠、藍LED本身特性相關(guān)外，廣東大功率投光燈廠家，使用電流，廣東大功率投光燈廠家、PCB板散熱設(shè)計、顯示屏使用環(huán)境溫度等均對衰減影響。廣東大功率投光燈廠家</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="廣東大功率投光燈廠家,投光燈" src="https://tyunfile.71360.com/WaterMark/UploadFile/shxiansheng/637269781569589844/2953538.png"></div><p style="text-indent:25px">2.LED應(yīng)用產(chǎn)品散熱難結(jié)構(gòu)設(shè)計在燈具中大概占20%,一直以來中困勤勞人民都會定價很低，20%成本認為很合理，zui大的問題是怎樣更有創(chuàng)新，設(shè)計更合理。―散熱成本要維持在5%,實際散熱設(shè)計很簡單，把住兩個方向:一是，LED芯片與外散熱器件路徑越短越好，越短你的散熱設(shè)計就越好;二是，散熱阻力，就是要有足夠的散熱傳到路徑同時也要有足夠的'散熱道路'.這部分成本主要在結(jié)構(gòu)，用于散熱成本并不多。3.LED應(yīng)用電源管理電源是LED燈具zui薄弱的環(huán)節(jié)，嚴重滯后LED燈具發(fā)展，品質(zhì)有待提高。河北飛利浦投光燈燈具靜電過大，也是造成led燈珠不亮的原因。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="廣東大功率投光燈廠家,投光燈" src="https://tyunfile.71360.com/WaterMark/UploadFile/shxiansheng/637269781919140625/8831194.png"></div><p style="text-indent:25px">通過施加一個PWM信號來控制LED亮度的做法允許不改變彩色的情況下完成LED的調(diào)光。人們常說的真正彩色(TrueColor)PWM調(diào)光是利用-一個PWM信號來調(diào)節(jié)LED的亮度。調(diào)節(jié)LED亮度有三種常用方法:(1)使用SET電阻，在LED驅(qū)動控制IC引腳RSET兩端并聯(lián)不同的轉(zhuǎn)換電阻，使用一個直流電壓設(shè)置LED驅(qū)動控制IC引腳RSET的電流，從而改變LED的正向工作電流，達到調(diào)節(jié)ALED(2)采用PWM技術(shù)，利用PWM控制信號，通過控制LED的正向工作電流的.占空比來調(diào)節(jié)AL .ED的發(fā)光亮度。<span style="display:none;"><span style="display:none;"><span style="display:none;"><span style="display:none;"><span style="display:none;"><span style="display:none;"><span style="display:none;"><span style="display:none;"><span style="display:none;"></span></span></span></span></span></span></span></span></span></p><p style="text-indent:25px">[3528]具有改善亮度的SMD二極管支架結(jié)構(gòu) 一種具有改善亮度的SMD二極管支架結(jié)構(gòu)及封裝構(gòu)造,包括膠體及多個金屬支架，膠體兩端形成功能區(qū)及凹槽，金屬支架各具有位于膠體中的基部，及延伸出膠體外的接腳部，且基部頂、底面顯露于功能區(qū)及凹槽以形成二極管支架結(jié)構(gòu)。功能區(qū)內(nèi)的基部頂面可固LED芯片，另- -基部底面可固接靜電防護芯片，而LED芯片、靜電防護芯片及基部_上連接有導(dǎo)線，且功能區(qū)覆蓋有***封膠，凹槽覆蓋有第二封膠，以構(gòu)成二極管封裝構(gòu)造。通過LED芯片固接于功能區(qū)內(nèi)，而靜電防護芯片固接于凹槽內(nèi)，使LED芯片的光線能均勻的于功能區(qū)內(nèi)反射，達到提升亮度均勻化的效果。LED在顯示屏整體成本中所占比例比較大，從30%至70%不等。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="廣東大功率投光燈廠家,投光燈" src="https://tyunfile.71360.com/WaterMark/UploadFile/shxiansheng/637269781806748047/1466494.png"></div><p style="text-indent:25px"><span style="display:none;"></span>雖然功率不大的單個用電器功率因素低一點對電網(wǎng)的影響不大，但晚上大家點燈，同類負載太集中，會對電網(wǎng)產(chǎn)生較嚴重的污染。對于30瓦~40瓦的LED驅(qū)動電源，據(jù)說不久的將來，也許會對功率因素方面有一定的指標要求。4. 驅(qū)動方式現(xiàn)在通行的有兩種:其一是一個恒壓源供多個恒流源，每個恒流源單獨給每路LED供電。這種方式，組合靈活，一路LED故障，不影響其他LED的工作，但成本會略高-一點。另一種是直接恒流供電，LED串聯(lián)或并聯(lián)運行。它的優(yōu)點是成本低一點，但靈活性差，還要解決某個LED故障，不影響其他LED運行的問題。這兩種形式，在-段時間內(nèi)并存。<span style="display:none;"><span style="display:none;"></span></span>led 頂燈短路也可能造成led頂燈不亮，這種情況可以是有部分小公司在led 頂燈生產(chǎn)工藝存在虛焊。上海批發(fā)投光燈具</p><p style="text-indent:25px">要用老化設(shè)備和檢測設(shè)備如果你把幾個廠家的LED放在老化儀上用大電流老化24小時或者更長時間。廣東大功率投光燈廠家</p><p style="text-indent:25px">有些元器件是因為自身內(nèi)部的接觸不良，也有元器件互連時的接觸不良，也有虛焊（一般為組件與PCB）產(chǎn)生的不良。下面以zui常見的連接器（接插件）之間的接觸為實例分析接觸不良問題，之后大家可以觸類旁通。連接器一般是針接觸件和孔接觸件之間的連接。我們知道，元器件的引腳或端子，一般是有一層鍍層，比如鍍鉛錫合金、鍍純錫、鍍鎳、鍍銀、鍍銀鈀合金、鍍金、等等。所以組件之間的接觸，其實就是這些鍍層金屬之間的接觸。當然，不同的鍍層金屬的導(dǎo)電率是不同的，對應(yīng)產(chǎn)生的接觸電阻也有所不同。廣東大功率投光燈廠家</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2985416.html</p></div></div></div></div></div><div id="b3spbi2" class="page-right twoColRt"><div id="xgncyfh" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="q2qsugi" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" alt="福建ZF配件哪家強信息推薦自業(yè)物資供應(yīng)" class="vcenter" 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