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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>湖南LED吸頂燈,LED</p><p><span>***更新：</span>2020-12-03 05:10:28</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="c32wewy" 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(huà): </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(xiàn)] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="zboldf7" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="k39z2lc" class="box"><p><p style="text-indent:25px">常用調(diào)光方法的工作原理 1、脈沖寬度調(diào)制（PWM）調(diào)光法這種調(diào)光控制法是利用調(diào)節(jié)高頻逆變器**率開(kāi)關(guān)管的脈沖占空比，從而實(shí)現(xiàn)燈輸出功率的調(diào)節(jié)。半橋逆變器的比較大占空比為0.5，以確保半橋逆變器中的兩個(gè)功率開(kāi)關(guān)管之間有一個(gè)死時(shí)間，以避免兩個(gè)功率開(kāi)關(guān)管由于共態(tài)導(dǎo)通而損壞。這種調(diào)光控制法能使功率開(kāi)關(guān)管導(dǎo)通時(shí)工作在零電壓開(kāi)關(guān)（ZVS）狀態(tài)，關(guān)斷瞬間需采用吸收電容以達(dá)到ZCS工作條件，這樣即可進(jìn)入ZVS工作方式，這是它的優(yōu)點(diǎn)，同時(shí)EMII和功率開(kāi)關(guān)管的電應(yīng)力可以明顯降低，然而，湖南LED吸頂燈，如果脈沖占空比太小，以致電感電流不連續(xù)，將會(huì)失去ZVS工作特性，湖南LED吸頂燈，并且由于供電直流電壓較太小，湖南LED吸頂燈，以致電感電流不連續(xù)，將會(huì)失去ZVS工作特性，并且由于供電直流電壓較的工作可靠性降低并加大EMI輻射。上海先盛照明電器有限公司是一家專(zhuān)業(yè)提供LED的公司，有想法可以來(lái)我司咨詢(xún)！湖南LED吸頂燈</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="湖南LED吸頂燈,LED" src="https://tyunfile.71360.com/WaterMark/UploadFile/shxiansheng/637402596358599967/471457.png"></div><p> 本篇文章介紹如何判斷燈珠類(lèi)型，燈珠的串并數(shù)，以及判斷燈珠板的額定輸入電壓和電流；另外，還介紹了市面上常見(jiàn)的LED驅(qū)動(dòng)器的類(lèi)型，參數(shù)規(guī)格，以及如何配套好你想要的燈珠板。LED燈珠L(zhǎng)ED燈珠的類(lèi)型，從草帽燈珠，食人魚(yú)這些都已經(jīng)消失的封裝開(kāi)始，到SMD，COB，CSP，日新月異，還需要適時(shí)補(bǔ)充。LED燈珠的組成LED燈珠由以下幾個(gè)部分組成：晶片，基板支架，導(dǎo)線(xiàn)，熒光粉，光學(xué)透鏡，支架塑料，如下圖：也有CSP就是沒(méi)有導(dǎo)線(xiàn)的對(duì)比，如：發(fā)光原理從物理學(xué)角度來(lái)理解：當(dāng)電流通過(guò)晶片時(shí)，N型半導(dǎo)體內(nèi)的電子與P型半導(dǎo)體內(nèi)的空穴在發(fā)光層劇烈地碰撞復(fù)合產(chǎn)生光子，以光子的形式發(fā)出能量（即大家看見(jiàn)的光）。不同材料的半導(dǎo)體會(huì)產(chǎn)生不同顏色的光色，如紅光、綠光、藍(lán)光等等。所以，沒(méi)有熒光粉的，直接就是晶片本身發(fā)光顏色，一般彩色燈珠都是這種類(lèi)型。但是，到目前為止還沒(méi)有任何一種半導(dǎo)體材料能發(fā)出白色的光。這里就需要提到一位諾貝爾獎(jiǎng)獲得者——中村修二博士。他發(fā)明出了藍(lán)光LED，由此也為白光LED奠定了一定的基礎(chǔ)?；谶@項(xiàng)重大的貢獻(xiàn)在2014年授予他諾貝爾物理學(xué)獎(jiǎng)。至于藍(lán)光LED是如何轉(zhuǎn)變?yōu)榘坠釲ED，大的原因在于晶片中多了一層熒光粉。湖南LED吸頂燈上海先盛照明電器有限公司為您提供手持機(jī)，有想法可以來(lái)我司咨詢(xún)！</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="湖南LED吸頂燈,LED" src="https://tyunfile.71360.com/WaterMark/UploadFile/shxiansheng/637402597764566974/7165671.png"></div><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+）=℃?，F(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)，燈殼與環(huán)境等溫。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(xiàn)。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。</p><p>應(yīng)用范圍比較廣，可以在線(xiàn)性燈具，燈帶，筒燈，面光源等全系列的燈具應(yīng)用上。這些燈珠封裝形式的功率，一般設(shè)計(jì)為，，，不過(guò)后來(lái)因?yàn)榫夹g(shù)和散熱支架（PCT，紅銅）等，功率可以上升到1W,甚至2W?，F(xiàn)在甚至出現(xiàn)有5050，7070等SMD，功率能到3W以上。大功率表面貼裝性第三種燈珠也是表貼型，它與小功率表貼在本質(zhì)上很類(lèi)似，只不過(guò)大功率、體積都大一點(diǎn);在細(xì)微結(jié)構(gòu)上，多了一個(gè)透鏡，可以將光線(xiàn)更好地匯聚在一起。這些類(lèi)型功率都偏大，一般屬于國(guó)外大芯片公司壟斷了技術(shù)，一般封裝形式有：大功率芯片，3535；電壓一般還是3V-5V，額定電流可以從300mA-1500mA之間；集成封裝性（COB)它是將很多燈珠芯片封裝在同一塊板上，晶片是通過(guò)一定形式的串并數(shù)，用金線(xiàn)連接的。一般的串并數(shù)都是10串，或者12串的設(shè)計(jì)，因?yàn)槎际窃O(shè)計(jì)在特低安全SELV42V以下。一般基板材料有：鋁基板，陶瓷板；例如CREE的COB一般是陶瓷基板；注意：安裝時(shí)候，不能用手或者其他工具觸摸，按壓熒光粉表面。上海先盛照明電器有限公司LED獲得眾多用戶(hù)的認(rèn)可。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="湖南LED吸頂燈,LED" src="https://tyunfile.71360.com/WaterMark/UploadFile/shxiansheng/637402595906998428/7665052.png"></div><p>隨著近幾年LED應(yīng)用的發(fā)展，各種替代傳統(tǒng)熒光燈的LED照明產(chǎn)品快速發(fā)展并不斷完善。LED日光燈管產(chǎn)品，性能不斷提升，價(jià)格不斷下降，已經(jīng)達(dá)到替代傳統(tǒng)熒光燈管的地步。LED格柵燈是我們?nèi)粘W(xué)習(xí)、工作和生活的常見(jiàn)照明燈具之一。它既節(jié)能又光亮，給我們帶來(lái)了極大的便利。今期小編就和大家分享關(guān)于LED格柵燈的安裝和注意事項(xiàng)問(wèn)題。LED格柵燈安裝說(shuō)明取下燈盤(pán)上之格柵反光罩，注意取格柵反光罩時(shí)輕拿輕放，不要刮傷，將燈具本體放置已預(yù)留好的天花龍骨上。放置時(shí)請(qǐng)注意四邊的位置，讓其燈具四邊完全擱置龍骨條上，以免燈具掉落，注意當(dāng)燈具較重時(shí)，請(qǐng)用線(xiàn)絲將燈具吊裝在天花板上。將電源線(xiàn)從出線(xiàn)孔穿入，正確地接于接線(xiàn)端子臺(tái)處，請(qǐng)注意L標(biāo)識(shí)處接火線(xiàn)，N標(biāo)識(shí)處接零線(xiàn)，地標(biāo)識(shí)處接地線(xiàn)。正確地裝入光源，裝光源時(shí)請(qǐng)注意將光源卡入燈頭槽內(nèi)，聽(tīng)到啪的一聲后，表示光源與燈頭銅片處接觸良好。將格柵反光罩的吊帶一端栓在燈具本體吊帶孔內(nèi)，以方便后續(xù)更換光源，將格柵反光罩卡入燈具本體內(nèi)。注意彈片須與格柵反光罩良好地接觸，以免格柵反光罩脫落。上海先盛照明電器有限公司致力于提供LED，歡迎新老客戶(hù)來(lái)電！湖南室外LED報(bào)價(jià)表</p><p style="text-indent:25px">LED，就選上海先盛照明電器有限公司，讓您滿(mǎn)意，歡迎您的來(lái)電哦！湖南LED吸頂燈</p><p> 這個(gè)黑體加熱的溫度稱(chēng)之為該光源的顏色溫度，簡(jiǎn)稱(chēng)色溫。其單位用“K”開(kāi)爾文表示。CorrelatedColorTemperature:但實(shí)際上，絕大多數(shù)照明光源的光色并不能恰好在黑體輻射線(xiàn)上，于是RaymondDavis等人提出了相關(guān)色溫的概念，其思想是在均勻色品圖上用距離短的溫度來(lái)表示光源的相關(guān)色溫，用K氏溫度表示。CIE1931色度圖相關(guān)色溫，以及u,v坐標(biāo)，x,y坐標(biāo)對(duì)比：明白相關(guān)色溫的概念，色溫可以用積分球測(cè)定，以及可以知道坐標(biāo)，SDCM，CRI，光通量等，機(jī)器如下：色容差SDCM同樣的相關(guān)色溫，坐標(biāo)不同，給人的感覺(jué)是完全不同的，如：同樣是3000K相關(guān)色溫的兩個(gè)LED燈珠色容差：表征光色電檢測(cè)系統(tǒng)軟件計(jì)算的X，Y值（uv)與標(biāo)準(zhǔn)光源之間的差別，數(shù)值越小，準(zhǔn)確度越高，光的顏色就越**。圈圈可以理解為步長(zhǎng)（step)，分7步，5步，3步，2步，1步。CREE燈珠一般出廠(chǎng)都在4步以?xún)?nèi)；我們現(xiàn)在的SMD2835燈珠，一般都在5步以?xún)?nèi)，一般為2-3步不等；色漂，隨著電流不同，溫度或者時(shí)間不同，色溫出線(xiàn)飄逸的現(xiàn)象。越小越好。光品質(zhì)：色容差與色溫的關(guān)系，你真的懂？光品質(zhì)：色容差與色溫的關(guān)系，你真的懂？/content/17/0720/09/27356145_tml燈珠電壓以上圖表燈珠電壓都是按3V的倍數(shù)計(jì)算。湖南LED吸頂燈</p></p><br /><p>文章來(lái)源地址: 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