• LED驅動電源的設計與測試要求

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    LED驅動電源的設計與測試要求

    發布時間:2017-11-06

    LED驅動電源隨著電力與照明行業的發展,它的設計要求也在不斷發生變化,現在也是各大半導體廠商爭奪的重點。LED驅動電源是把電源供應轉換為特定的電壓電流以驅動LED發光的電源轉換器。通常情況下,LED驅動電源的輸入包括高壓工頻交流(即市電)、低壓直流、高壓直流、低壓高頻交流(如電子變壓器的輸出)等。而LED驅動電源的輸出則大多數為可隨LED正向壓降值變化而改變電壓的恒定電流源。  

    隨著LED的應用日益廣泛,LED驅動電源的性能將越來越適合LED的要求。在選擇和設計LED驅動電源時要考慮到以下幾點:

    1.高效率。LED是節能產品,驅動電源的效率要高。對于電源安裝LED驅動電源在燈具內的結構,尤為重要。因為LED的發光效率隨著LED溫度的升高而下降,所以LED的散熱非常重要。電源的效率高,它的耗損功率小,在燈具內發熱量就小,也就降低了燈具的溫升。對延緩LED的光衰有利。

    2.高可靠性。特別像LED路燈的驅動電源,裝在高空,有防水鋁殼驅動電源,質量好的話不容易壞,減少維修次數。

    3.高功率因數。功率因數是電網對負載的要求。一般70瓦以下的用電器,沒有強制性指標。雖然功率不大的單個用電器功率因素低一點對電網的影響不大,但晚上大家點燈,同類負載太集中,會對電網產生較嚴重的污染。對于30瓦~40瓦的LED驅動電源,據說不久的將來,也許會對功率因數方面有一定的指標要求。

    4.驅動方式。現在通行的有兩種:其一是一個恒壓源供多個恒流源,每個恒流源單獨給每路LED供電。這種方式,組合靈活,一路LED故障,不影響其他LED的工作,但成本會略高一點。另一種是直接恒流供電,LED串聯或并聯運行。它的優點是成本低一點,但靈活性差,還要解決某個LED故障,不影響其他LED運行的問題。這兩種形式,在一段時間內并存。多路恒流輸出供電方式,在成本和性能方面會較好。也許是以后的主流方向。

    5.浪涌保護。LED抗浪涌的能力是比較差的,特別是抗反向電壓能力。加強這方面的保護也很重要。有些LED燈裝在戶外,如LED路燈。由于電網負載的啟甩和雷擊的感應,從電網系統會侵入各種浪涌,有些浪涌會導致LED的損壞。因此LED驅動電源要有抑制浪涌的侵入,保護LED不被損壞的能力。

    6.保護功能。電源除了常規的保護功能外,最好在恒流輸出中增加LED溫度負反饋,防止LED溫度過高、燈具外安裝型,電源結構要防水、防潮,外殼要耐曬。  

    7.驅動電源的壽命要與LED的壽命相適配。

    8.要符合安規和電磁兼容的要求。

    另一方面,LED驅動電源是應用式電源,其品質和安全性都要經過專業的電源測試系統來進行檢驗,例如LED驅動是否是恒流或者恒壓,不同的LED驅動電流和電壓都不一定相同,它的功率保護,超載保護,輸入輸出上升波形、下降波形,輸入輸出電流,峰值等電源數據必須有精準的測試依據,以作產品品質優劣的判斷。


    LED驅動電源有哪些分類? | LED電源測試系統日常如何保養? | LED驅動電源測試系統生產線安裝步驟 | LED驅動電源常見難題 | LED驅動和驅動電路首要技能概況 | LED電源測試系統的優勢有哪些? | LED燈具老化架用什么做負載? |


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