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UPS即(ji)不(bu)間斷(duan)電(dian)(dian)(dian)(dian)(dian)源，是將(jiang)蓄(xu)電(dian)(dian)(dian)(dian)(dian)池(chi)（多為鉛(qian)酸免(mian)維護蓄(xu)電(dian)(dian)(dian)(dian)(dian)池(chi)）與(yu)主(zhu)機相連接(jie)，通(tong)(tong)過主(zhu)機逆(ni)變(bian)(bian)器(qi)(qi)等(deng)模塊電(dian)(dian)(dian)(dian)(dian)路將(jiang)直流(liu)電(dian)(dian)(dian)(dian)(dian)轉換成市電(dian)(dian)(dian)(dian)(dian)的系(xi)統設(she)備(bei)。主(zhu)要用(yong)于(yu)給(gei)單臺(tai)計算機、計算機網絡系(xi)統或其它電(dian)(dian)(dian)(dian)(dian)力(li)電(dian)(dian)(dian)(dian)(dian)子設(she)備(bei)如電(dian)(dian)(dian)(dian)(dian)磁閥、壓力(li)變(bian)(bian)送器(qi)(qi)等(deng)提供(gong)穩(wen)定、不(bu)間斷(duan)的電(dian)(dian)(dian)(dian)(dian)力(li)供(gong)應。當市電(dian)(dian)(dian)(dian)(dian)輸入正常(chang)時(shi)(shi)，UPS將(jiang)市電(dian)(dian)(dian)(dian)(dian)穩(wen)壓后供(gong)應給(gei)負(fu)載(zai)使用(yong)，此(ci)時(shi)(shi)的就是一(yi)臺(tai)交流(liu)市電(dian)(dian)(dian)(dian)(dian)穩(wen)壓器(qi)(qi)，同時(shi)(shi)它還向機內電(dian)(dian)(dian)(dian)(dian)池(chi)充電(dian)(dian)(dian)(dian)(dian)；當市電(dian)(dian)(dian)(dian)(dian)中斷(duan)（事故停電(dian)(dian)(dian)(dian)(dian)）時(shi)(shi)，立即(ji)將(jiang)電(dian)(dian)(dian)(dian)(dian)池(chi)的直流(liu)電(dian)(dian)(dian)(dian)(dian)能(neng)，通(tong)(tong)過逆(ni)變(bian)(bian)零切換轉換的方法向負(fu)載(zai)繼續供(gong)應220V交流(liu)電(dian)(dian)(dian)(dian)(dian)，使負(fu)載(zai)維持正常(chang)工(gong)作并保護負(fu)載(zai)軟(ruan)、硬(ying)件不(bu)受損壞。UPS設(she)備(bei)通(tong)(tong)常(chang)對電(dian)(dian)(dian)(dian)(dian)壓過高(gao)或電(dian)(dian)(dian)(dian)(dian)壓過低都能(neng)提供(gong)保護。
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