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id="dpffdlt" class="leftbox clearfix"><h1>戶外LED燈泡歡迎咨詢上海先盛照明電器供應(yīng)</h1><div id="xldddbz" class="proBig"><div id="hfn9tzh" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/shxiansheng/637402596297770001/2735169.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="xvltbrz" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/shxiansheng/637402596297770001/2735169.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="bpxnvdt" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)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>戶外LED燈泡,LED</p><p><span>***更新：</span>2020-12-18 00:18:25</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="djrhpnt" 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(jī): </span>021-54169416</p><p><span>地址: </span>陶干路1199號(hào)</p><p>[當(dāng)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="9hzzd9p" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="ltrpv5b" class="box"><p><p> 而LED基板與PCB之間的熱阻一般是℃/w（鋁基板的熱阻一般小于℃/w),那么Tj與PCB板之間溫差為8+℃。燈具散熱材料，一般壓鑄鋁（鋁合金的熱阻一般*為℃/w)，那么燈殼到LEDPN結(jié)之間的溫差約為：（8+）=℃。現(xiàn)在問(wèn)題是：燈殼Tscase與燈周邊環(huán)境溫度Ta的溫度差多少？這是由燈具的系統(tǒng)熱阻決定的。加入用于熱失散的燈殼接觸環(huán)境空間的面積為A，此面積大小就決定了兩者之間的溫差。當(dāng)A趨于無(wú)窮大時(shí)，戶外LED燈泡，燈殼與環(huán)境等溫，戶外LED燈泡，戶外LED燈泡。這是做不到的。日本西鐵城等公司，測(cè)算出散熱器面積與Tj的關(guān)系曲線。一個(gè)，要使Tj從100℃下降到80℃，散熱器與空氣接觸面積要增加60平方里面以上，由此可估算：60cm2/；每增加1W電功率的LED，若用60平方厘米以上的散熱器時(shí)，其Tj結(jié)溫將下降20℃。計(jì)算：那么用約用℃。那么，燈具系統(tǒng)熱阻Rthsystem=20/℃/w；于是對(duì)燈具施加，在Ta=25℃時(shí)，燈殼上的溫度應(yīng)該是：Tscase=25℃+℃；此時(shí)，通過(guò)前面的計(jì)算，我們可以知道LEDPN結(jié)溫是：Tj=45+℃；PN結(jié)溫Tj比起光效值100lm/WTj=25℃的時(shí)候，高了（）=℃；也就是一個(gè)100lm的LED光通量較Tj=25℃的時(shí)候要低：；100個(gè)LED等于比Tj=25℃時(shí)候，低；由此可以得知燈具的熱效率=（1-735/10000)=。所以：三個(gè)部分疊加后。LED，就選上海先盛照明電器有限公司，讓您滿意，歡迎新老客戶來(lái)電！戶外LED燈泡</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="戶外LED燈泡,LED" src="https://tyunfile.71360.com/WaterMark/UploadFile/shxiansheng/637402596297770001/2735169.png"></div><p> 中等黃綠色；R5，淡藍(lán)綠色；R6，淡藍(lán)色；R7，淡紫藍(lán)色；R8，淡紅紫色；R9，飽和紅色；R10，飽和黃色；R11，飽和綠色；R12，飽和藍(lán)色；R13，白種人膚色；R14，樹(shù)葉綠；R15，黃種人膚色。其中R9的飽和紅色，是現(xiàn)階段白光燈珠的主要考核指標(biāo)。Ra:前面8種顏色的平均值；Re：全部15種顏色的平均值；同樣的晶片大小，如果想要得到的CRI越高，就需要在熒光粉上面增加R9的紅粉，但是會(huì)造成總體光通量的變小?？破召N丨顯色指數(shù)CRI到底是什么你真的懂嗎？/a/_729145ra（顯色指數(shù)(Ra)）_百度百科ra是顯色指數(shù)。為了對(duì)光源的顯色性進(jìn)行定量的評(píng)價(jià)，引入顯色指數(shù)的概念。以標(biāo)準(zhǔn)光源為準(zhǔn)，將其顯色指數(shù)定為100，其余光源的顯色指數(shù)均低于100。...baike./item/ra/2870726眩光UGR待整理。[圖文]眩光指數(shù)(UGR)介紹-百度文庫(kù)在線互動(dòng)式文檔分享平臺(tái)，在這里，您可以和千萬(wàn)網(wǎng)友分享自己手中的文檔，全文閱讀其他用戶的文檔，同時(shí)，也可以利用分享文檔獲取的積分下載文檔wenku./view/LED燈珠的串并方式串聯(lián)用電器首尾依次連接在電路中。特點(diǎn):電路只有一條路徑,任何一處開(kāi)路都會(huì)出現(xiàn)開(kāi)路。同樣LED燈珠串聯(lián)時(shí)：電壓疊加，額定電流不變。戶外LED燈泡LED，就選上海先盛照明電器有限公司，用戶的信賴之選，歡迎您的來(lái)電！</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="戶外LED燈泡,LED" src="https://tyunfile.71360.com/WaterMark/UploadFile/shxiansheng/637402595791627408/1170035.png"></div>據(jù)不徹底統(tǒng)計(jì)分析，現(xiàn)階段銷售市場(chǎng)上仍是存在一些LED面板燈有側(cè)邊緣透光的問(wèn)題出現(xiàn)，那樣的難題不但是面板燈的品質(zhì)可想而知，并且還會(huì)危害面板燈的美觀大方性和質(zhì)量，因此，下邊來(lái)分析一下LED面板燈側(cè)漏光線難題及解決方案。 <p> 首先，必須弄清楚LED面板燈怎么會(huì)涌起側(cè)漏光線難題呢?關(guān)鍵有下列幾個(gè)因素： </p> <p> 1. 開(kāi)展安裝時(shí)沒(méi)有扭緊，沒(méi)有擰結(jié)子些。 </p> <p> 2. 內(nèi)嵌燈源部位有難題，導(dǎo)致燈源亮度過(guò)強(qiáng)，好像側(cè)邊透光。 </p> <p> 3. 在走向市場(chǎng)的那時(shí)候，必須根據(jù)質(zhì)量檢驗(yàn)，從視覺(jué)到表層必須查驗(yàn)發(fā)亮狀況是不是優(yōu)良。 </p> <p> 對(duì)于上面幾個(gè)問(wèn)題，處理LED面板燈側(cè)漏光線難題解決方案： </p> <p> <br /> </p> <p> <br /> </p><p style="text-indent:25px">在正弦波的正半周（即О~北區(qū)間）角常用α表示;而在 wtl~T的相位區(qū)間可控硅導(dǎo)通，這一范圍稱為可控硅的導(dǎo)通角，常用p表示。同樣在正弦交流電的負(fù)半周，對(duì)處于反向聯(lián)接的另一只可控硅（相對(duì)于兩個(gè)單向可控硅的反向并聯(lián)而言），在t2時(shí)刻(即相位角wt2）施加觸發(fā)脈沖，使其導(dǎo)通。如此周而復(fù)始，對(duì)正弦波的每一半周期控制其導(dǎo)通，獲得相同的導(dǎo)通角。如果改變觸發(fā)脈沖的觸發(fā)時(shí)間（或相位），即改變可控硅導(dǎo)通角p(或控制角α）的大小。導(dǎo)通角越大電路的輸出電壓越高，相應(yīng)燈負(fù)載的發(fā)光越亮。可見(jiàn)，在可控硅調(diào)光電路中，電路輸出的電壓波形已經(jīng)不再是正弦波了，除非調(diào)光電路工作在全導(dǎo)通狀態(tài)，即導(dǎo)通角為180°(或?qū)ㄏ辔粸門(mén)）。LED，就選上海先盛照明電器有限公司，歡迎客戶來(lái)電！</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="戶外LED燈泡,LED" src="https://tyunfile.71360.com/WaterMark/UploadFile/shxiansheng/637402596473062897/9399623.png"></div><p> 半導(dǎo)體的物理伏安特性伏安特性所謂伏安特性，即是流過(guò)P-N結(jié)的電流隨電壓變化的特性，在示波器上能十分形象地展示這種變化。一根完整的伏安曲線包括正向特性與反向特性。通常，反向特性曲線變化較為陡峭，當(dāng)電壓超過(guò)某個(gè)閾值時(shí)，電流會(huì)出現(xiàn)指數(shù)式上升。通常可用反向擊穿電壓，反向電流和正向電壓三個(gè)參數(shù)來(lái)進(jìn)行伏安特性曲線的描述。所以，LED的工作前提：LED屬于半導(dǎo)體，有單向?qū)щ娦?，流過(guò)的電流和電壓不成線性正比。LED光通量隨電流增大而增大，但也不成正比。工作在低壓的直流電下，一般電壓在2-5VDC之間，紅光一般工作低壓低，藍(lán)光（白光）工作電壓在3-4V，而紫外光電壓在4-5V之間；電壓不能過(guò)高，大于某個(gè)閾值的時(shí)候，電流會(huì)指數(shù)式上升，沒(méi)有保護(hù)電路的話，一般會(huì)擊穿晶片；反向電壓一般為10V左右，大不得超過(guò)15V，否則會(huì)反向擊穿燈珠。（接反會(huì)導(dǎo)致反向電壓，過(guò)高會(huì)造成損壞）LED各類型封裝芯片的一般額定電壓，額定電流表格SMD中小功率SMD中小功率封裝形式的電壓，電流都不一定的。一般是3-5V，不過(guò)也有特意幾個(gè)晶片串聯(lián)一起的高壓燈珠，有6V，9V，18V，24V等。<span style="display:none;"></span>上海先盛照明電器有限公司LED服務(wù)值得放心。上海安裝LED模組</p><p style="text-indent:25px">LED，就選上海先盛照明電器有限公司，讓您滿意，期待您的光臨！戶外LED燈泡</p><p style="text-indent:25px">除了小的脈沖占空比外，當(dāng)燈電路發(fā)生故障時(shí)，也會(huì)出現(xiàn)功率開(kāi)關(guān)管的不連續(xù)電流工作狀態(tài)，當(dāng)燈負(fù)載出現(xiàn)開(kāi)路故障時(shí)，電感電流將流過(guò)諧振電容，由于這個(gè)電容的容量較小，所以阻抗較大，而在這個(gè)諧振電容上產(chǎn)生較高的電壓。除非兩個(gè)功率開(kāi)關(guān)管有吸收保護(hù)電路，否則這時(shí)功率開(kāi)關(guān)管將承受很大的電壓應(yīng)力。2、改變半橋逆變器供電電壓調(diào)光法利用改變半橋逆變器供電電壓的方法實(shí)現(xiàn)調(diào)光有以下優(yōu)點(diǎn):①利用調(diào)節(jié)半橋逆變器供電電壓來(lái)實(shí)現(xiàn)調(diào)光。①脈沖占空比（約0.5）固定，使半橋逆變器工作在軟開(kāi)關(guān)工作狀態(tài)，并可在鎮(zhèn)流電感電流連續(xù)的工作條件下實(shí)現(xiàn)寬調(diào)光范圍的調(diào)光（這也可使開(kāi)關(guān)控制電路簡(jiǎn)化）。①由于開(kāi)關(guān)工作頻率固定，所以可以針對(duì)給定的熒光燈型號(hào)簡(jiǎn)化控制電路設(shè)計(jì)。戶外LED燈泡</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/2445420.html</p></div></div></div></div></div><div id="zfv9jd9" class="page-right twoColRt"><div id="l97rfnt" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="h9v9rzp" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img 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