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UPS即(ji)不間斷(duan)電(dian)(dian)(dian)(dian)(dian)源，是將(jiang)蓄電(dian)(dian)(dian)(dian)(dian)池(chi)（多為鉛酸免維護(hu)(hu)蓄電(dian)(dian)(dian)(dian)(dian)池(chi)）與主(zhu)機(ji)相連(lian)接，通過主(zhu)機(ji)逆變器等模塊電(dian)(dian)(dian)(dian)(dian)路將(jiang)直流電(dian)(dian)(dian)(dian)(dian)轉(zhuan)換(huan)成市(shi)電(dian)(dian)(dian)(dian)(dian)的(de)(de)系統設(she)備(bei)。主(zhu)要(yao)用(yong)于給單臺計算(suan)機(ji)、計算(suan)機(ji)網絡系統或其它(ta)電(dian)(dian)(dian)(dian)(dian)力電(dian)(dian)(dian)(dian)(dian)子設(she)備(bei)如(ru)電(dian)(dian)(dian)(dian)(dian)磁閥、壓(ya)力變送器等提(ti)供穩定、不間斷(duan)的(de)(de)電(dian)(dian)(dian)(dian)(dian)力供應。當市(shi)電(dian)(dian)(dian)(dian)(dian)輸入正常(chang)時，UPS將(jiang)市(shi)電(dian)(dian)(dian)(dian)(dian)穩壓(ya)后供應給負載使(shi)用(yong)，此時的(de)(de)就(jiu)是一臺交(jiao)流市(shi)電(dian)(dian)(dian)(dian)(dian)穩壓(ya)器，同時它(ta)還向機(ji)內(nei)電(dian)(dian)(dian)(dian)(dian)池(chi)充電(dian)(dian)(dian)(dian)(dian)；當市(shi)電(dian)(dian)(dian)(dian)(dian)中(zhong)斷(duan)（事(shi)故停(ting)電(dian)(dian)(dian)(dian)(dian)）時，立(li)即(ji)將(jiang)電(dian)(dian)(dian)(dian)(dian)池(chi)的(de)(de)直流電(dian)(dian)(dian)(dian)(dian)能，通過逆變零切換(huan)轉(zhuan)換(huan)的(de)(de)方法向負載繼續供應220V交(jiao)流電(dian)(dian)(dian)(dian)(dian)，使(shi)負載維持正常(chang)工(gong)作并保(bao)護(hu)(hu)負載軟、硬件(jian)不受損壞。UPS設(she)備(bei)通常(chang)對電(dian)(dian)(dian)(dian)(dian)壓(ya)過高或電(dian)(dian)(dian)(dian)(dian)壓(ya)過低都(dou)能提(ti)供保(bao)護(hu)(hu)。
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