常見的3類UPS電源

UPS按(an)工作原理分成后備式、在線式與在線互動式三大類(lei)。

1、后備式UPS

在市(shi)電(dian)(dian)正(zheng)常時(shi)直接由市(shi)電(dian)(dian)向負(fu)載(zai)供電(dian)(dian)，當(dang)市(shi)電(dian)(dian)超(chao)出(chu)其(qi)(qi)工作(zuo)范圍或停電(dian)(dian)時(shi)，通過轉換(huan)開關轉為(wei)電(dian)(dian)池(chi)逆變供電(dian)(dian)。其(qi)(qi)特點是：結構簡單，體(ti)積小(xiao)，成本低，但輸入電(dian)(dian)壓范圍窄，輸出(chu)電(dian)(dian)壓穩(wen)定精度差，有切換(huan)時(shi)間，且輸出(chu)波形一般(ban)為(wei)方(fang)波。

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2、在線互動式UPS

在市(shi)電(dian)(dian)正常時(shi)直接由(you)市(shi)電(dian)(dian)向負載供(gong)電(dian)(dian)，當市(shi)電(dian)(dian)偏(pian)低或偏(pian)高(gao)時(shi)，通過UPS內部(bu)穩壓線路(lu)穩壓后(hou)輸(shu)出，當(dang)市電(dian)(dian)異(yi)常或停電(dian)(dian)時(shi)，通過轉換開關(guan)轉為(wei)電(dian)(dian)池逆變供電(dian)(dian)。其特(te)點(dian)是：有較寬(kuan)的輸(shu)入(ru)電(dian)(dian)壓范圍，噪音低(di)，體積小等特(te)點(dian)，但同樣存(cun)在切換時(shi)間。

3、在線式UPS

在(zai)市(shi)電(dian)(dian)正常時(shi)，由市(shi)電(dian)(dian)進行整(zheng)流(liu)提(ti)供直流(liu)電(dian)(dian)壓(ya)給逆變(bian)器工作，由逆變(bian)器向負載提(ti)供交流(liu)電(dian)(dian)，在(zai)市(shi)電(dian)(dian)異常時(shi)，逆變(bian)器由電(dian)(dian)池(chi)提(ti)供能量，逆變(bian)器始終處于工作狀態(tai)，保證無間斷輸出(chu)。其特點是(shi)，有極寬的輸入電(dian)(dian)壓(ya)范(fan)圍，無切換(huan)時(shi)間且輸出(chu)電(dian)(dian)壓(ya)穩定(ding)精度(du)高，特別適合(he)對(dui)電(dian)(dian)源要求較高的場(chang)合(he)，但是(shi)成本較高。目前，功率大(da)于3KVA的(de)UPS幾乎(hu)都是在(zai)線式UPS。