常見的3類UPS電源

UPS按(an)工(gong)作原理分成(cheng)后備(bei)式、在線(xian)式與在線(xian)互動式三大類。

1、后備式UPS

在市電(dian)(dian)(dian)正常時(shi)直接由市電(dian)(dian)(dian)向負載供電(dian)(dian)(dian)，當(dang)市電(dian)(dian)(dian)超(chao)出其(qi)工(gong)作(zuo)范圍(wei)或停(ting)電(dian)(dian)(dian)時(shi)，通過轉(zhuan)換(huan)開關(guan)轉(zhuan)為電(dian)(dian)(dian)池逆(ni)變供電(dian)(dian)(dian)。其(qi)特點(dian)是(shi)：結構(gou)簡單，體積小，成本低，但輸入電(dian)(dian)(dian)壓范圍(wei)窄(zhai)，輸出電(dian)(dian)(dian)壓穩定精(jing)度(du)差(cha)，有切換(huan)時(shi)間(jian)，且(qie)輸出波(bo)形一般為方(fang)波(bo)。

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2、在線互動式UPS

在市(shi)電正(zheng)常(chang)時直接由市(shi)電向負載(zai)供電，當市(shi)電偏低或偏高時，通過(guo)UPS內部(bu)穩壓(ya)線路穩壓(ya)后輸(shu)出，當市電異常或停電時(shi)，通過轉換(huan)開關(guan)轉為(wei)電池逆變供電。其特點是：有較寬的輸(shu)入電壓(ya)范(fan)圍，噪音低，體積小等特點，但同樣存在(zai)切換(huan)時(shi)間。

3、在線式UPS

在市電(dian)(dian)正常時(shi)(shi)，由(you)(you)市電(dian)(dian)進行(xing)整流提供(gong)直流電(dian)(dian)壓給逆(ni)(ni)變(bian)器(qi)工作，由(you)(you)逆(ni)(ni)變(bian)器(qi)向負載提供(gong)交流電(dian)(dian)，在市電(dian)(dian)異常時(shi)(shi)，逆(ni)(ni)變(bian)器(qi)由(you)(you)電(dian)(dian)池提供(gong)能量，逆(ni)(ni)變(bian)器(qi)始終處于工作狀態，保證無間(jian)斷輸出(chu)。其特(te)點是，有極(ji)寬的(de)輸入(ru)電(dian)(dian)壓范圍，無切換時(shi)(shi)間(jian)且輸出(chu)電(dian)(dian)壓穩(wen)定精度高(gao)，特(te)別適合(he)對電(dian)(dian)源要(yao)求較高(gao)的(de)場合(he)，但是成本較高(gao)。目(mu)前，功率(lv)大于3KVA的UPS幾乎都(dou)是在線式(shi)UPS。