UPS即不間(jian)斷電(dian)(dian)源,是將蓄電(dian)(dian)池(多為(wei)鉛酸(suan)免維護(hu)蓄電(dian)(dian)池)與主機(ji)相連接(jie),通過主機(ji)逆變(bian)(bian)器等模塊(kuai)電(dian)(dian)路將直流(liu)電(dian)(dian)轉換(huan)成市(shi)電(dian)(dian)的(de)系統設(she)備(bei)。主要用(yong)于(yu)給單臺(tai)(tai)計算(suan)機(ji)、計算(suan)機(ji)網絡(luo)系統或其它電(dian)(dian)力電(dian)(dian)子(zi)設(she)備(bei)如電(dian)(dian)磁(ci)閥、壓(ya)力變(bian)(bian)送器等提供穩(wen)(wen)定、不間(jian)斷的(de)電(dian)(dian)力供應(ying)。當市(shi)電(dian)(dian)輸入正常(chang)(chang)時(shi),UPS將市(shi)電(dian)(dian)穩(wen)(wen)壓(ya)后供應(ying)給負載使用(yong),此時(shi)的(de)就是一臺(tai)(tai)交流(liu)市(shi)電(dian)(dian)穩(wen)(wen)壓(ya)器,同時(shi)它還向(xiang)機(ji)內電(dian)(dian)池充電(dian)(dian);當市(shi)電(dian)(dian)中(zhong)斷(事故停電(dian)(dian))時(shi),立即將電(dian)(dian)池的(de)直流(liu)電(dian)(dian)能,通過逆變(bian)(bian)零切換(huan)轉換(huan)的(de)方法向(xiang)負載繼(ji)續(xu)供應(ying)220V交流(liu)電(dian)(dian),使負載維持正常(chang)(chang)工(gong)作(zuo)并保護(hu)負載軟(ruan)、硬件(jian)不受損壞(huai)。UPS設(she)備(bei)通常(chang)(chang)對(dui)電(dian)(dian)壓(ya)過高或電(dian)(dian)壓(ya)過低都(dou)能提供保護(hu)。