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UPS（UninterruptiblePowerSystem/UninterruptiblePowerSupply），即(ji)不(bu)間斷(duan)電(dian)(dian)(dian)(dian)(dian)源，是將蓄(xu)電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)（多為鉛酸免維護蓄(xu)電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)）與主機(ji)(ji)相連接，通過(guo)主機(ji)(ji)逆(ni)變器等(deng)模塊電(dian)(dian)(dian)(dian)(dian)路(lu)將直流(liu)電(dian)(dian)(dian)(dian)(dian)轉(zhuan)換(huan)成(cheng)市電(dian)(dian)(dian)(dian)(dian)的系(xi)統設備(bei)。主要用于給(gei)單臺計算機(ji)(ji)、計算機(ji)(ji)網絡系(xi)統或其它電(dian)(dian)(dian)(dian)(dian)力(li)電(dian)(dian)(dian)(dian)(dian)子設備(bei)如電(dian)(dian)(dian)(dian)(dian)磁閥(fa)、壓力(li)變送器等(deng)提供(gong)(gong)穩定、不(bu)間斷(duan)的電(dian)(dian)(dian)(dian)(dian)力(li)供(gong)(gong)應(ying)。當市電(dian)(dian)(dian)(dian)(dian)輸入(ru)正(zheng)常(chang)時(shi)，UPS將市電(dian)(dian)(dian)(dian)(dian)穩壓后供(gong)(gong)應(ying)給(gei)負(fu)載(zai)使(shi)用，此時(shi)的UPS就是一臺交流(liu)市電(dian)(dian)(dian)(dian)(dian)穩壓器，同(tong)時(shi)它還(huan)向機(ji)(ji)內(nei)電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)充(chong)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)，UPS立即(ji)將電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)的直流(liu)電(dian)(dian)(dian)(dian)(dian)能(neng)，通過(guo)逆(ni)變零切換(huan)轉(zhuan)換(huan)的方法向負(fu)載(zai)繼續(xu)供(gong)(gong)應(ying)220V交流(liu)電(dian)(dian)(dian)(dian)(dian)，使(shi)負(fu)載(zai)維持正(zheng)常(chang)工(gong)作并保護負(fu)載(zai)軟、硬件不(bu)受損(sun)壞(huai)。UPS設備(bei)通常(chang)對電(dian)(dian)(dian)(dian)(dian)壓過(guo)高(gao)或電(dian)(dian)(dian)(dian)(dian)壓過(guo)低都能(neng)提供(gong)(gong)保護。