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              PLC企業資訊
                1784-U2DHP /A
                發布者:gw0002  發布時間:2018-09-06 09:46:49

                1784-U2DHP /A

                1784-U2DHP /A

                1784-U2DHP /A

                1784-U2DHP /A


                《聯系人;歐先生》
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                有趣的事實還在于,對于直流電壓來說,電流越大,保險絲的熔斷表現就越關鍵。普通的集成式保險絲只能用在不超過4A額定的交/直流輸入環境下。若電流更大,150VDC以上的直流運行是不允許的。輸入為230VAC時,整流后的電壓已在320VDC左右,三相應用的變頻器中間電路電壓在360至900VDC之間,具體取決于源電壓。

                該問題已被重視。在當前的UL安規文檔(實際應用指導手冊)中已經精確描述了能夠使用DC電壓輸入的電源的定義。其所使用的熔斷保險絲必須能夠及時熔斷短路電流和過載電流,否則電源所處的環境就會產生危險的高溫。


                一臺適用于高壓直流電輸入的電源必須滿足以下兩點:

                配備合適的輸入濾波器,能夠過濾對地的高共模電壓;

                安裝的熔斷保險絲必須具備UL和IEC安規認證.

                在15W到480W功率級別范圍內,PULS普爾世可提供豐富的電源產品,這其中也包括經驗證的允許直流輸入的可靠電源產品。這些電源無論是在電氣間隙及爬電距離的設計方面,還是在直流操作時的輸入保險絲選擇方面,均獲得了許可。

                為了接入三相逆變器的中間直流總線電壓,電源需要的輸入電壓最大為900VDC。普爾世QS系列電源不再適用。能夠勝任的是普爾世概念型電源產品——DC/DC轉換器QTD20.241,它所配備的輸入級別大大增強了(圖6)。QTD20.241是標準電源QT20.241的修改版,它允許的直流輸入電壓范圍是360-900VDC。

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