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　　隨著(zhu)計算(suan)(suan)機應用系統(tong)對電源(yuan)的要(yao)(yao)求越(yue)來(lai)越(yue)高UPS日益受到重視(shi)，并(bing)逐(zhu)漸發展成為(wei)一種具有穩壓、穩頻(pin)、濾波、抗(kang)電磁和射頻(pin)干(gan)擾、防電壓沖(chong)浪(lang)等功能的電力保護(hu)系統(tong)。尤其是在電網的線路及供電質量(liang)不太高、抗(kang)干(gan)擾的技術落后，同時計算(suan)(suan)機系統(tong)對電源(yuan)的要(yao)(yao)求又比較高的情況下，UPS的作用就顯得更加明顯。

　　UPS的(de)(de)保護(hu)作用(yong)首(shou)先表現在(zai)對市(shi)(shi)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)源進行(xing)穩(wen)壓(ya)(ya)，UPS的(de)(de)輸(shu)入電(dian)(dian)(dian)(dian)壓(ya)(ya)范圍比較寬，一(yi)般情(qing)況(kuang)(kuang)是從170V到250V，而輸(shu)出電(dian)(dian)(dian)(dian)源的(de)(de)質量(liang)是相(xiang)當(dang)(dang)(dang)高的(de)(de)，后備式的(de)(de)UPS輸(shu)出電(dian)(dian)(dian)(dian)壓(ya)(ya)在(zai)5%~8%，輸(shu)出頻率穩(wen)定在(zai)1Hz;如圖1，在(zai)線(xian)式UPS輸(shu)出電(dian)(dian)(dian)(dian)壓(ya)(ya)穩(wen)定在(zai)3%以內，輸(shu)出頻率穩(wen)定在(zai)0.5Hz。在(zai)市(shi)(shi)電(dian)(dian)(dian)(dian)正(zheng)常(chang)時(shi)，UPS電(dian)(dian)(dian)(dian)源相(xiang)當(dang)(dang)(dang)于交流市(shi)(shi)電(dian)(dian)(dian)(dian)穩(wen)壓(ya)(ya)器;同時(shi)市(shi)(shi)電(dian)(dian)(dian)(dian)對蓄(xu)電(dian)(dian)(dian)(dian)池(chi)進行(xing)充電(dian)(dian)(dian)(dian)，此時(shi)也相(xiang)當(dang)(dang)(dang)于充電(dian)(dian)(dian)(dian)器。在(zai)市(shi)(shi)電(dian)(dian)(dian)(dian)突然掉電(dian)(dian)(dian)(dian)的(de)(de)情(qing)況(kuang)(kuang)下，UPS自(zi)動切換到蓄(xu)電(dian)(dian)(dian)(dian)池(chi)供電(dian)(dian)(dian)(dian)，使計算機維持正(zheng)常(chang)工作，保護(hu)軟硬件不受損害(hai)。

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