后備式UPS基本工作原理

市電供電正常時，工頻交流電經過濾波器、自動調壓器、繼電器觸點sl向負載供電。UPS電源廠家(jia)對于市電(dian)(dian)(dian)(dian)供(gong)電(dian)(dian)(dian)(dian)中止時，改(gai)由苫電(dian)(dian)(dian)(dian)池和逆(ni)變器(qi)向負載供(gong)電(dian)(dian)(dian)(dian)，由逆(ni)變器(qi)將直流電(dian)(dian)(dian)(dian)源變成交流電(dian)(dian)(dian)(dian)源，經過繼電(dian)(dian)(dian)(dian)器(qi)觸點s：向負載供(gong)電(dian)(dian)(dian)(dian)。

后備式UPS的性能特點

這種UPS最大的(de)長(chang)(chang)處(chu)是結構簡單，成本(ben)(ben)較低，噪音小。UPS電(dian)(dian)源(yuan)廠(chang)家發現但后(hou)備式UPS的(de)本(ben)(ben)質(zhi)特點是逆變器高線(xian)，因(yin)而(er)逆變形平時處(chu)在備用狀態。并(bing)且(qie)，因(yin)為(wei)容量小，切(qie)(qie)(qie)換(huan)(huan)(huan)開(kai)關大多選(xuan)用疾速(su)(su)切(qie)(qie)(qie)換(huan)(huan)(huan)的(de)繼電(dian)(dian)器（2—5mg）而(er)沒有選(xuan)用更(geng)高速(su)(su)切(qie)(qie)(qie)換(huan)(huan)(huan)的(de)靜態開(kai)關，因(yin)而(er)，切(qie)(qie)(qie)換(huan)(huan)(huan)時間相對(dui)長(chang)(chang)一些。當市(shi)電(dian)(dian)正(zheng)(zheng)常(chang)時，UPS將市(shi)電(dian)(dian)直(zhi)接(jie)導通到(dao)負(fu)載(zai)端，也就沒有整(zheng)流(liu)、濾波等功能(neng)，易(yi)受(shou)電(dian)(dian)網電(dian)(dian)壓及諧波電(dian)(dian)流(liu)的(de)影響(xiang)。只有當市(shi)電(dian)(dian)輸(shu)(shu)入(ru)中止或供電(dian)(dian)質(zhi)量超(chao)出(chu)UPS正(zheng)(zheng)常(chang)輸(shu)(shu)入(ru)范(fan)圍時，才起動逆變器切(qie)(qie)(qie)換(huan)(huan)(huan)到(dao)電(dian)(dian)池放電(dian)(dian)狀態，UPS輸(shu)(shu)出(chu)準(zhun)方波。

因(yin)為(wei)該類UPS輸入范圍窄、容量(liang)(liang)小，輸出供(gong)電質(zhi)量(liang)(liang)差，因(yin)而綜合可用(yong)性差，UPS電源(yuan)廠家認為(wei)只適(shi)合于單臺Pc等非重要場合的通(tong)常性電源(yuan)維(wei)護，例如(ru)家庭用(yong)電腦的維(wei)護。

后備式不間斷電源的優缺點

1、優點

產品價格(ge)低(di)，運(yun)營成本低(di)。正常(chang)(chang)情況下，逆(ni)變器處于非工作狀(zhuang)態(tai)，電(dian)(dian)網的(de)電(dian)(dian)能(neng)直接供(gong)給負載，因此后(hou)備式UPS的(de)電(dian)(dian)能(neng)轉換效率非常(chang)(chang)高。電(dian)(dian)池的(de)使(shi)用(yong)壽(shou)命一(yi)般為3~5年(nian)。

2、缺點

當電網電源出現故障時，從電網電源切換到逆變電源需要很長時間。對于要求高功率質量的器件，轉換時間的長短非常重要。再者，由于后備式UPS電源的逆變器(qi)工(gong)作不頻繁(fan)，不容(rong)易(yi)掌握逆變器(qi)的動態，容(rong)易(yi)形成(cheng)隱(yin)性故障。后備式不間斷電源一(yi)般用于一(yi)些非關鍵的低功率設備。

后備式UPS對電腦有損害嗎

后備(bei)式UPS電(dian)(dian)(dian)(dian)源對電(dian)(dian)(dian)(dian)腦沒(mei)有什(shen)么(me)損害性，因為(wei)UPS電(dian)(dian)(dian)(dian)源是一種提供(gong)連續供(gong)電(dian)(dian)(dian)(dian)且不斷(duan)電(dian)(dian)(dian)(dian)設備(bei)，當電(dian)(dian)(dian)(dian)腦連接市(shi)電(dian)(dian)(dian)(dian)正常使用時(shi)，突(tu)然(ran)停電(dian)(dian)(dian)(dian)就會導致關機(ji)(ji)，而UPS電(dian)(dian)(dian)(dian)源則(ze)可以瞬(shun)間提供(gong)電(dian)(dian)(dian)(dian)量，保持(chi)電(dian)(dian)(dian)(dian)腦不關機(ji)(ji)。