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      首頁 » 寫作素材 » 寫作經(jīng)驗(yàn) » 關(guān)于LED論文范文(關(guān)于LED燈的有關(guān)論文范文)

      關(guān)于LED論文范文(關(guān)于LED燈的有關(guān)論文范文)

      分類：寫作經(jīng)驗(yàn) 日期：2022-10-30 06:40 瀏覽：2 次

      關(guān)于LED論文范文

      關(guān)于LED論文范文

      固態(tài)照明正迅速成為機(jī)電工程與設(shè)計(jì)領(lǐng)域的熱點(diǎn)之一。LED實(shí)現(xiàn)了靈活性與高效性的結(jié)合，這是傳統(tǒng)照明技術(shù)無法比擬的。LED可以長時(shí)間提供穩(wěn)定可靠的照明，而且采用小型封裝，因此正在建筑和舞臺照明應(yīng)用領(lǐng)域得到廣泛采用。但是，每種不同的照明應(yīng)用都有其獨(dú)特性，不同的市場領(lǐng)域需要具有不同特性的產(chǎn)品。因此，市場中集成電路的'專業(yè)化趨勢不斷加強(qiáng)，也導(dǎo)致本來已經(jīng)種類繁多的產(chǎn)品型號變得更加豐富多彩。可編程混合信號微控制器正得到快速采用，因?yàn)閱蝹€(gè)微控制器能集成脈寬調(diào)制器(PWM)、通信接口、放大器、比較器及數(shù)據(jù)轉(zhuǎn)換器等多種外設(shè)。 通過將上述外設(shè)的完美組合，可實(shí)現(xiàn)對功能豐富而強(qiáng)大的可調(diào)光降壓轉(zhuǎn)換器等器件的控制。用于LED驅(qū)動(dòng)器應(yīng)用的降壓轉(zhuǎn)換器應(yīng)為電流模式調(diào)節(jié)器，因?yàn)長ED是電流模式器件。我們從LEDV-I曲線可以看出，正向電壓稍有變化，就會對電流產(chǎn)生較大影響。因此，任何LED驅(qū)動(dòng)器電路的反饋都應(yīng)視為電流。

      此外，我們應(yīng)使用恒定電流，因?yàn)橹圃焐虝鶕?jù)正向電流電平設(shè)定LED的顏色與強(qiáng)度。上述特性相當(dāng)重要，因?yàn)槲覀円ㄟ^有關(guān)特性值來確保系統(tǒng)符合整體規(guī)范的要求。 圖1給出了典型的LED系統(tǒng)，包括通信接口、不同顏色的LED(每種顏色都代表一個(gè)通道)、智能化功能以及每個(gè)通道的恒定電流驅(qū)動(dòng)器。通信接口可以為DMX512或DALI，這是兩種標(biāo)準(zhǔn)的照明協(xié)議，此外也可以為ZigBee或無線USB接口。智能化功能可通過內(nèi)置模數(shù)轉(zhuǎn)換器(ADC)與LED調(diào)光外設(shè)的微控制器實(shí)現(xiàn)。ADC用于監(jiān)控溫度與LED電流等系統(tǒng)變量，完成系統(tǒng)監(jiān)控與色彩混合任務(wù)。驅(qū)動(dòng)器為通道中的每個(gè)LED提供恒定電流。驅(qū)動(dòng)器的復(fù)雜性與質(zhì)量決定了驅(qū)動(dòng)器的價(jià)格。

      磁滯降壓控制器在微控制器上集成LED驅(qū)動(dòng)器有助于減小整體系統(tǒng)解決方案的尺寸。現(xiàn)在，幾乎沒有什么解決方案將開關(guān)模式電源(SMPS)這樣的高功率元件與微控制器的智能化功能完美結(jié)合在一起。退而求其次，就是將SMPS的反饋與控制電路完美集成在微控制器中。

      磁滯控制器 啟動(dòng)時(shí)，通過電感的電流開始上升，直至比較器正輸入的電壓大于比較器負(fù)輸入的電壓。隨后，轉(zhuǎn)換器將作為自由運(yùn)行的振蕩器，電流會在兩個(gè)層面間充電和放電。 ITH_HIGH與ITH_LOW的大小可由并聯(lián)電阻、RIN與RHYST反饋電阻以及DAC輸出電壓通過下列等式計(jì)算得出。我們可以看到，RHYST值越大，ITH_HIGH與ITH_LOW的差就越小。

      關(guān)于LED論文范文(關(guān)于LED燈的有關(guān)論文范文)

      關(guān)于LED燈的有關(guān)論文范文

      關(guān)于LED燈的有關(guān)論文范文

      現(xiàn)代建筑裝飾，不僅注重室內(nèi)空間的構(gòu)成要素，更加重視照明對室內(nèi)外環(huán)境所產(chǎn)生的美學(xué)效果以及由此而產(chǎn)生的心理效應(yīng)。因此，燈光照明不僅僅是延續(xù)自然光，而是在建筑裝飾中充分利用明與暗的搭配，光與影的組合創(chuàng)造一種舒適、優(yōu)美的光照環(huán)境。所以，人們對室內(nèi)裝修的燈飾選擇越來越重視。在裝潢中，依據(jù)不同建筑室內(nèi)空間環(huán)境中所需照度，應(yīng)正確選用照明方式與燈具類型來為人們提供良好的光照條件，以使人們在建筑室內(nèi)空間環(huán)境中能夠獲得最佳的視覺效果，同時(shí)還能夠獲得某種氣氛和意境，增強(qiáng)其建筑室內(nèi)空間表現(xiàn)效果及審美感受。照明設(shè)計(jì)具有二個(gè)特性：一是它的藝術(shù)性；二是它的功能性。 藝術(shù)性是指，用各種不同的照明手法和色彩會產(chǎn)生各種不同的心理效果。各種形狀的顯示和立體感、境深及不同的建筑風(fēng)格都需要通過照明設(shè)計(jì)來產(chǎn)生不同的效果。功能性是指，在不同類型的建筑中的使用功能不一樣，它需要按使用者在生理上的需要，來選擇不同的燈具和照度。如我們在看書和休息時(shí)的照度是不一樣的。這在國內(nèi)至國際上有根據(jù)視覺健康面推薦各應(yīng)用場所和活動(dòng)形式的照度標(biāo)準(zhǔn)，有各工作場合的亮度分布值，有各類眩光評價(jià)等級，有頻閃影響的研究數(shù)據(jù)等等，供我們查尋。而我們有時(shí)候進(jìn)行室內(nèi)裝潢照明設(shè)計(jì)時(shí)，單純地追求藝術(shù)性，而往往忽略了人們生理上的需要。 就此，列出十條注意事項(xiàng)，簡述如何選擇正確燈具的技巧，供朋友們參考。 這十項(xiàng)技巧可解決裝潢中出現(xiàn)的一般室內(nèi)燈光的問題，以達(dá)到使用者的所有需求和提供有效的工作條件環(huán)境：

      1、人類的視力非常依賴周遭視界的.亮度。當(dāng)環(huán)境的亮度增加時(shí)，人類的動(dòng)力和整體視力也相對地增加；而發(fā)生錯(cuò)誤的可能性也降低。簡單來說，我們可以把照度分為7級：定向與簡單視覺作業(yè)30、50、100lx；普通視覺作業(yè)300、500、1000 lx；特殊視覺作業(yè)3000~10000 lx 。可以按照不同的室內(nèi)要求來選擇燈具的照度。

      2. 光線的分布 —— 分布在室內(nèi)不同平面的柔和燈光，能給予空間舒適感。相反地，不適合或過多的燈光將會造成視力的損傷和疲勞。

      3. 適當(dāng)?shù)姆垂饪刂?—— 室內(nèi)的反光雖然不至于引響視力，但可能會對視力造成刺激和傷害。

      4. 良好的對比校正 ——對比的重要是能使得眼睛分辨實(shí)物和背景。一個(gè)燈光系統(tǒng)內(nèi)，良好的對比校正不會引起反光，甚至是發(fā)亮的平面和文件。既使是光滑的紙張也不會影響閱讀。

      5. 投射方向的正確 —— 燈具投射方向的位置對對比校正而言是重要的。同時(shí)，它也影響光線和陰影的分布。 6. 適當(dāng)?shù)年幱盃顟B(tài) —— 陰影可加強(qiáng)立體視線和指引的功能。有效的散布光和直接光組合可產(chǎn)生良好的陰影狀態(tài)。

      7. 適當(dāng)顏色的呈現(xiàn) —— 白晝時(shí)，自然光源的光線會更換。因此，人工光源可呈現(xiàn)不同的顏色和光線表現(xiàn)，以支援不同的照明功能和情境。

      8. 自然顏色校正 ——僅有入射光內(nèi)的頻譜性色彩可被物體反射和被肉眼察覺。顏色校正為人造光源能力的測量，以表現(xiàn)物體的天然顏色。有條件的話，推薦使用LED類光源產(chǎn)品，顯色性以及色溫、節(jié)能方面都表現(xiàn)出眾。

      9. 有效的照明環(huán)境 ——光能影響人的心情和感覺。對室內(nèi)和燈光的感受是一種主觀且無意識的印象。近年來，大眾越來越注意工作場所的正面照明環(huán)境的重要性。

      10. 有效的控制能源消耗 ——現(xiàn)代燈具設(shè)計(jì)的基本要求是能源的再利用和節(jié)省。節(jié)能、環(huán)保和健康是綠色照明的基本宗旨。1991年美國環(huán)保署倡導(dǎo)的綠色照明已普及全球，深入人心，對照明設(shè)計(jì)有深刻影響。目前對于燈具的安裝，和舊式低效率的系統(tǒng)的再改造和重整已經(jīng)有許多解決方案。

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       蜀ICP備2020033479號-4  Copyright ? 2016  學(xué)習(xí)鳥. 頁面生成時(shí)間：0.249秒

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