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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>上海工程LED導(dǎo)軌射燈,LED</p><p><span>***更新：</span>2021-01-14 07:10:25</p><p><span id="click" >瀏覽次數(shù)：1次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="bhneqh7" 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="p4s8znj" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="rv7fcoa" class="box"><p><p> 也有設(shè)計(jì)的非常好的隔離驅(qū)動(dòng)，也是可以做到效率高達(dá)92-93%計(jì)算：設(shè)定電源效率是85%，那么100W的電功率算上損耗是100/，那么實(shí)際光效就是：10000/。光學(xué)器件：一般照明燈具，特別是窄光束角的光源，需要用二次光學(xué)設(shè)計(jì)，以達(dá)到所需求的配光要求。一般有反光杯，透鏡，防眩光杯這些光學(xué)器件。光學(xué)器件這個(gè)行業(yè)設(shè)計(jì)需要很專(zhuān)業(yè)的光學(xué)設(shè)計(jì)軟件，難度非常高。一般的光學(xué)級(jí)透鏡或者反光杯的透光率，都不超過(guò)90%。一些防眩光高的，或者光束角窄的光學(xué)器件，透光率會(huì)更低一些，上海工程LED導(dǎo)軌射燈。計(jì)算：設(shè)定光學(xué)透鏡的光透率是90%，那么通過(guò)電源和光學(xué)透鏡這兩個(gè)組成部分得出的光效為：10000*。熱效率：燈具外殼對(duì)LED光源的熱管理的效率。通常燈具將PCB板，燈殼用來(lái)做散熱通道，實(shí)現(xiàn)熱失散，對(duì)燈具有一系統(tǒng)熱阻的設(shè)計(jì)問(wèn)題，也就是好的散熱系統(tǒng)。LED的PN結(jié)上溫度Tj與燈具環(huán)境溫度Ta之間的溫度梯度越小越好。燈具的系統(tǒng)熱阻=燈具外殼（或者內(nèi)部平均溫度）與環(huán)境溫度之差，與燈具功率之比，上海工程LED導(dǎo)軌射燈。Rthsystem=(Tscase?Ta)/Pin(℃/w)Rthsystem=(Tscase-Ta)/Pin(℃/w)Rthsystem=(Tscase?Ta)/Pin(℃/w)假設(shè):LED的熱阻為8℃/w，則一個(gè)LED上加1w電功率后，LEDPN結(jié)上的溫度Tj與底座散熱底板之間溫差為8℃，上海工程LED導(dǎo)軌射燈。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！上海工程LED導(dǎo)軌射燈</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="上海工程LED導(dǎo)軌射燈,LED" src="https://tyunfile.71360.com/WaterMark/UploadFile/shxiansheng/637402596032623473/7450815.png"></div><p>LED路燈與常規(guī)路燈不同的是，LED光源采用低壓直流供電、由GaN基功率型藍(lán)光LED與黃色合成的高效白光，LED路燈是指用LED燈具制作的路燈，具有高效、安全、節(jié)能、環(huán)保、壽命長(zhǎng)、響zhi應(yīng)速度快、顯色指數(shù)高等優(yōu)點(diǎn)，對(duì)城市節(jié)能照明具有十分重要的意義。優(yōu)點(diǎn)1、LED路燈本身的特性——光的單向性，沒(méi)有光的漫射，可以很好的保證光照效率。LED體積小，重量輕，采用環(huán)氧樹(shù)脂封裝，不僅可以保護(hù)內(nèi)部芯片，還具有聚光透光的能力，其使用壽命大多在50000-100000小時(shí)之間。2、獨(dú)特的二次光學(xué)設(shè)計(jì)，將光照射到所需照明的區(qū)域，進(jìn)一步提高了光照效率，以達(dá)到節(jié)能目的。3、LED的已達(dá)110-130lm/W，很大的發(fā)展空間，理論值達(dá)360lm/W。高壓鈉燈的發(fā)光效率是隨功率增加才會(huì)有所增加，總體光效LED路燈比高壓鈉燈強(qiáng)；(這個(gè)總體光效是理論上的，實(shí)際上250W以上高壓鈉燈的光效高于LED燈）。4、LED路燈的光顯色性比高壓鈉燈高許多，高壓鈉燈顯色指數(shù)只有23左右，而LED路燈顯色指數(shù)達(dá)到75以上，從視覺(jué)心理角度考慮，達(dá)到同等亮度。5、光衰小，一年的光衰不到3%，使用10年仍達(dá)到道路要求，而高壓鈉燈光衰大，一年左右已經(jīng)下降30%以上，因此，LED路燈在使用功率的設(shè)計(jì)上可以比高壓鈉燈低。上海家用LED用途上海先盛照明電器有限公司致力于提供LED，期待您的光臨！</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="上海工程LED導(dǎo)軌射燈,LED" src="https://tyunfile.71360.com/WaterMark/UploadFile/shxiansheng/637402595981588241/3608375.png"></div><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，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，并且由于供電直流電壓較太小，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。</p><p>平角的LED燈珠直插可以做到90-110度。角度越小，聚光性越好，光線(xiàn)越集中，光線(xiàn)射得更遠(yuǎn)。缺點(diǎn)是照射范圍有限。LED燈珠貼片，一般角度都是平面120度，因?yàn)榻嵌却螅l(fā)光均勻，通常在照常照明產(chǎn)品上大量使用。比如，日光燈管，球泡燈，面板燈，很多照明產(chǎn)品上用的都是SMDLED貼片燈珠。LED燈珠貼片可以上高速SMD，過(guò)回流焊的溫度可以達(dá)到260度，重要的是LED燈珠貼片可以批量上高速貼片燈，批量工業(yè)化生產(chǎn)，照明產(chǎn)品上的話(huà)，省人工，機(jī)器貼裝，效率更高，焊接不良率更低。而LED燈珠（LED燈珠直插式）因?yàn)榻嵌刃?，聚光性好，但是因?yàn)橹挥袃蓚€(gè)引腳散熱，所以，一般只能過(guò)波峰焊。或者，手工電烙鐵焊接，焊接要求焊接時(shí)間短，對(duì)焊接工人的焊接技術(shù)有要求，否則會(huì)產(chǎn)生較多的不良率。LED燈珠和LED貼片哪個(gè)更好？其實(shí)重要的，還是要看你是用在什么產(chǎn)品上的，如果是用在大功率，或者大瓦數(shù)的照明產(chǎn)品上，一般是建議使用LED燈珠貼片式的，成本更低，效率更高。而如果是用在指示燈上，或者要求聚光，高亮的，小功率的，一般可以選用上海先盛照明電器有限公司LED燈珠直插式的。因此，LED燈珠和LED貼片兩種發(fā)光二極管，本質(zhì)上就沒(méi)有太大的區(qū)別，都是LED燈珠的封裝方式。上海先盛照明電器有限公司致力于提供LED，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="上海工程LED導(dǎo)軌射燈,LED" src="https://tyunfile.71360.com/WaterMark/UploadFile/shxiansheng/637402596555670259/3880999.png"></div><p>我們可以在噴頭下方用一個(gè)盆接住噴頭噴出的水。而這個(gè)盆有固定的面積，它可以接到多少水，就著這個(gè)位置所得到的照度。光強(qiáng)：光強(qiáng)是發(fā)光強(qiáng)度的簡(jiǎn)稱(chēng)。表示光源在單位立體角內(nèi)光通量的多少。發(fā)光強(qiáng)度是指光源在指定方向上的單位立體角內(nèi)發(fā)出的光通量，也就是說(shuō)光源向空間某一方向輻射的光通密度。符號(hào)用I表示，國(guó)際單位是candela（坎德拉）簡(jiǎn)寫(xiě)cd。光強(qiáng)了光源在不同方向上的輻射能力。通俗的說(shuō)發(fā)光強(qiáng)度就是光源所發(fā)出的光的強(qiáng)弱程度。亮度：亮度是指發(fā)光體（反光體）表面發(fā)光（反光）強(qiáng)弱的物理量。人眼從一個(gè)方向觀察光源，在這個(gè)方向上的光強(qiáng)與人眼所“見(jiàn)到”的光源面積之比，定義為該光源單位的亮度，即單位投影面積上的發(fā)光強(qiáng)度。亮度用符號(hào)L表示，亮度的單位是坎德拉/平方米（cd/m2）。光源的明亮程度與發(fā)光體表面積有關(guān)系，同樣的光強(qiáng)的情況下，發(fā)光面積大，則暗，反之則亮。亮度與發(fā)光面的方向也有關(guān)系，同一發(fā)光面在不同的方向上其亮度值也是不同的，通常是按垂直于視線(xiàn)的方向進(jìn)行計(jì)量的。相關(guān)閱讀光通量是啥意思？上海先盛照明電器有限公司為您提供LED。上海原裝LED單價(jià)</p><p style="text-indent:25px">上海先盛照明電器有限公司致力于提供LED，竭誠(chéng)為您服務(wù)。上海工程LED導(dǎo)軌射燈</p><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(xiàn)包括正向特性與反向特性。通常，反向特性曲線(xiàn)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?？捎梅聪驌舸╇妷?，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(xiàn)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(xiàn)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(huà)，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(lèi)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>上海工程LED導(dǎo)軌射燈</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/2840982.html</p></div></div></div></div></div><div id="jiz83iz" class="page-right twoColRt"><div id="otolnu3" class="box01 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