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UPS（UninterruptiblePowerSystem/UninterruptiblePowerSupply），即(ji)不(bu)間(jian)斷電(dian)(dian)(dian)源，是將蓄電(dian)(dian)(dian)池(chi)（多為鉛酸免(mian)維護(hu)蓄電(dian)(dian)(dian)池(chi)）與主(zhu)機相連接，通過(guo)(guo)主(zhu)機逆變器(qi)等(deng)模塊電(dian)(dian)(dian)路將直(zhi)(zhi)流(liu)電(dian)(dian)(dian)轉換成市電(dian)(dian)(dian)的(de)系統設(she)(she)備(bei)。主(zhu)要用(yong)于(yu)給單臺(tai)(tai)計算(suan)機、計算(suan)機網絡系統或(huo)其它電(dian)(dian)(dian)力電(dian)(dian)(dian)子設(she)(she)備(bei)如電(dian)(dian)(dian)磁閥、壓(ya)(ya)力變送器(qi)等(deng)提供(gong)穩定、不(bu)間(jian)斷的(de)電(dian)(dian)(dian)力供(gong)應(ying)。當(dang)市電(dian)(dian)(dian)輸入正(zheng)常(chang)時(shi)，UPS將市電(dian)(dian)(dian)穩壓(ya)(ya)后(hou)供(gong)應(ying)給負載(zai)使用(yong)，此時(shi)的(de)UPS就是一臺(tai)(tai)交流(liu)市電(dian)(dian)(dian)穩壓(ya)(ya)器(qi)，同時(shi)它還向機內電(dian)(dian)(dian)池(chi)充(chong)電(dian)(dian)(dian)；當(dang)市電(dian)(dian)(dian)中(zhong)斷（事故停電(dian)(dian)(dian)）時(shi)，UPS立即(ji)將電(dian)(dian)(dian)池(chi)的(de)直(zhi)(zhi)流(liu)電(dian)(dian)(dian)能，通過(guo)(guo)逆變零切換轉換的(de)方法向負載(zai)繼續供(gong)應(ying)220V交流(liu)電(dian)(dian)(dian)，使負載(zai)維持正(zheng)常(chang)工作并保(bao)護(hu)負載(zai)軟(ruan)、硬(ying)件不(bu)受損壞。UPS設(she)(she)備(bei)通常(chang)對電(dian)(dian)(dian)壓(ya)(ya)過(guo)(guo)高或(huo)電(dian)(dian)(dian)壓(ya)(ya)過(guo)(guo)低都能提供(gong)保(bao)護(hu)。