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      新聞動態
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      首頁 > 新聞動態>>行業新聞 >>只有效率高達99%的線性恒流源才能夠做出高性能的LED光引擎

      只有效率高達99%的線性恒流源才能夠做出高性能的LED光引擎


      1. 什么是光引擎?
      光引擎就是把恒流源和光源做到同一塊鋁基板上,只要固定到散熱器和焊兩根電源線就變成燈具。

      2. 光引擎有哪些優點?
      可以說推廣光引擎的最大好處有以下幾個方面。

      ? 降低 LED照明燈具廠家研發費用,縮短產品生產周期
      因為所有LED燈具的光學和電氣指標都由光引擎生產廠家制定了。甚至還推薦了相應的散熱器。燈具廠家只要把光引擎安裝到散熱器里面去就可以了。燈具廠商甚至不需要經驗豐富的光學、電子工程師,也不需要購買昂貴的光學和電子儀器設備。換句話說,光引擎可以大大降低LED燈具廠的準入門限,但卻不會因此降低LED燈具的產品質量。當然這要求光引擎的生產廠家本身就要有極高的水平才行。

      ? 推廣光引擎可以大大加速LED燈具的推廣
      最近幾年隨著白熾燈的禁產、禁銷,LED燈具即將迎來爆炸式的增長。LED燈具廠如雨后春筍般的大量涌出。這雖然是一種必然趨勢,但是也帶來了很多問題,尤其是表現在LED燈具的質量上的良莠不齊和大量廠商之間的無序價格戰。LED光引擎的出現可以在很大程度上解決這類問題。因為質量是由幾家生產光引擎的大廠決定,價格也不可能有太大的出入。這就大大地減少了由無序競爭而引起的內耗。有助于LED燈具產業的高速發展。

      ? 提升了LED燈具的整體性能
      例如提高了整體光效(lm/W),這里是指包括電源效率在內的整體光效,又如色溫,顯色指數,等也可以按需生產。而且在同樣的光通量時還可能降低功耗,進一步節能。

      ? 降低了成本
      至少可以省去了恒流驅動源的模塊,及其生產成本。實際上,由于采用COB LED,不但省去封裝。生產還可以高度自動化,這就會大大降低生產成本。

      3. 開關恒流源不適合做成光引擎
      因為開關電源的元件數目太多,做到鋁基板上就會擋去很大一部分光線。而且因為元件數目多,焊接麻煩,發生故障的幾率也高,可靠性降低!
       

       

      4. 普通線性恒流源雖然元件數很少但是效率太低
       


       

      在220V時效率只有85%,市電電壓越高,效率越低?,F在市面上很多所謂“交流ACLED光引擎”和“去電源光引擎”都是采用了這種普通的線性恒流源。

      5. 低效恒流源集成到鋁基板上會增加很多熱量,使得其結溫升高
      以10WLED為例,恒流源效率85%,所以只有8.5W功率提供給LED點亮,LED本身發光效率只有40%,有60%(8.5x0.6=5.1W)都轉換為熱量?,F在還要加上恒流源的1.5W的熱量,使得鋁基板上的熱量增加了1.5/5.1=0.3,也就是增加了30%的熱量。近似地說,LED的結溫也會增高30%。

      6. LED結溫升高后,會降低發光效率,縮短壽命
      LED的結溫升高會導致內量子效率降低,從而使光效降低,熒光粉的發光效率也會隨溫升增高而降低。
      任何一個設計得好的燈具,必須使得其在熱穩定以后的結溫為85度左右,這樣可以保證其壽命(衰減至70%)在三萬小時。
      而至于光效的降低,有人做了一些實驗,得出了接近線性降低的曲線。
       

       

      從25度室溫升高到85度的溫度結溫時其光效降低15%左右。通常我們把剛開始時的光效稱為冷光效,溫度穩定以后的光效稱為熱光效。
      現在結溫增加了30%,也就是達到110度,從這個曲線可以外推,得到這時候的光效大約是冷光效的75%,也就是降低了25%,或者比原來的熱光效降低了10%。
      而其壽命的降低也可以從Cree公司提供的壽命和結溫關系曲線中得出:
       

       

      我們可以看出,如果原來的結溫是85度,那么壽命就是30,000小時;而如果結溫升高到110度,那么壽命就連10,000小時也不到了。

      7. 埃菲萊公司發明了效率高達99%的線性恒流源
      這種高效線性恒流源的實測效率如下圖所示:
       

       

      藍色為恒流源本身的效率,紅色為加上整流器以后的總效率,在175V-265V內效率不變。
      它的溫度穩定性也很好,當環境溫度從35度增高到85度時,總效率不變。
       

       

      而且,在采用這種高效率恒流源做成光引擎以后,它在輸入交流電壓改變時,輸出的功率不變,流明數不變,光效不變。

       



       

      這樣穩定的性能是任何線性恒流源無法做到的!

      8. 用這種高效率恒流源做成的高光效光引擎
      在2013年初把這種高效率恒流源做成了高光效光引擎,其外形照片如下:
       

       

      把這個光引擎做成球泡燈以后送到國家電光源質量監督檢驗中心(上海)去檢測,測得結果如下:功率:7.93W,流明數:1001.2,光效:126.3lm/W,色溫:6121K,顯色指數:84.5,如果去掉光罩0.9的透過率,那么光引擎本身的光效為140.3lm/W.
      2015年埃菲萊公司已經做出功率為60W光效為145lm/W的D80H光引擎和160W光效為129lm/W的D80A光引擎
       

      圖片說明

      圖片說明

       

      9. 高效光引擎的十大優點
      這種高效光引擎的優點可以歸結如下十點:
      1. 把恒流源放到鋁基板上,不會增加鋁基板的熱量,既不會降低光效,也不會縮短壽命。
      2. 去掉了電源模塊,減小了空間,電源芯片也不需要帶散熱片的封裝,甚至也可以不用封裝,降低了成本。
      3. 恒流源的高效率,可將整燈光效(lm/W)提高至少10%左右
      4. 提高電源效率,也減小了10%能耗,進一步節能
      5. 減少了整燈的熱量,如果采用同樣的散熱器,可以進一步降低LED結溫,延長LED壽命
      6.恒流源一共只有5個元件,提高了電源的可靠性
      7.采用環形COB LED,也進一步改進了散熱,提高了光效
      8.因為是線性電源,整燈不存在電磁干擾EMI的問題
      9.對外機械接口只有鋁基板尺寸和三顆螺釘位置,甚至于還可以不用螺釘而采用導熱膠來固定,電氣接口只有兩根220V電源線,很容易標準化
      10.簡化了生產過程,降低了生產成本,連同BOM成本的總成本降低30%左右。

      所以只有采用這樣高效率(99%)的線性恒流驅動源,才能夠做成高性能的光引擎!

      結束語
      現在埃菲萊公司已經生產出了從10W到160W的各種功率的高光效光引擎,這些光引擎可以應用于從球泡燈、軌道燈、筒燈、到投光燈、路燈等各種類型的LED燈具里,可以說這種高光效LED光引擎的出現將會改變整個LED行業的格局。而且如果能夠組織起來充分發揮這種高效率的光引擎的作用,使得所有LED都能采用這種高效率的光引擎,那么又可以對節能減排提供極其驚人的節能效果。中國的照明用電量為總用電量的14.5%,2014年總發電量為56496億度電,即照明用電量為8191.9億度電。采用埃菲萊的光引擎以后至少可以節約10%的能量,也就是819.2億度電,而三峽發電站的年發電量為847億度電,所以也就能夠節約出一個三峽發電站來。而全球照明用電量占總用電量的19%,2014全球總發電量為238670億度電,所以照明用電量為45350億度電,采用埃菲萊的光引擎以后就可以節約4535億度電,相當于5個三峽電站的發電量。

      `
    3. 更新時間:2016-06-01
    4. 發布者:王先生
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