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UPS（UninterruptiblePowerSystem/UninterruptiblePowerSupply），即不間斷電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源，是將(jiang)(jiang)(jiang)蓄(xu)(xu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)（多(duo)為鉛酸免維護(hu)蓄(xu)(xu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)）與主機(ji)(ji)(ji)相連接，通(tong)過(guo)(guo)主機(ji)(ji)(ji)逆變器等(deng)模塊電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路將(jiang)(jiang)(jiang)直(zhi)流電(dian)(dian)(dian)(dian)(dian)(dian)(dian)轉換(huan)成市(shi)(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)的(de)系統設備(bei)(bei)。主要用于給單臺計算機(ji)(ji)(ji)、計算機(ji)(ji)(ji)網絡系統或其(qi)它電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)子設備(bei)(bei)如(ru)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁閥、壓(ya)力(li)變送器等(deng)提供穩定、不間斷的(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)供應(ying)。當市(shi)(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)輸入(ru)正(zheng)常時(shi)，UPS將(jiang)(jiang)(jiang)市(shi)(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)穩壓(ya)后(hou)供應(ying)給負載使(shi)用，此時(shi)的(de)UPS就(jiu)是一臺交流市(shi)(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)穩壓(ya)器，同(tong)時(shi)它還向(xiang)機(ji)(ji)(ji)內電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)充電(dian)(dian)(dian)(dian)(dian)(dian)(dian)；當市(shi)(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)中斷（事故停電(dian)(dian)(dian)(dian)(dian)(dian)(dian)）時(shi)，UPS立(li)即將(jiang)(jiang)(jiang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)的(de)直(zhi)流電(dian)(dian)(dian)(dian)(dian)(dian)(dian)能(neng)，通(tong)過(guo)(guo)逆變零切換(huan)轉換(huan)的(de)方法向(xiang)負載繼續(xu)供應(ying)220V交流電(dian)(dian)(dian)(dian)(dian)(dian)(dian)，使(shi)負載維持正(zheng)常工作并保(bao)護(hu)負載軟、硬件不受損(sun)壞(huai)。UPS設備(bei)(bei)通(tong)常對電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)過(guo)(guo)高或電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)過(guo)(guo)低(di)都能(neng)提供保(bao)護(hu)。