常見的3類UPS電源

UPS按(an)工(gong)作原理(li)分成(cheng)后備式(shi)、在線式(shi)與(yu)在線互動式(shi)三大(da)類(lei)。

1、后備式UPS

在市電(dian)(dian)正常時直(zhi)接由市電(dian)(dian)向負載供電(dian)(dian)，當(dang)市電(dian)(dian)超出其(qi)工作范圍或停電(dian)(dian)時，通(tong)過(guo)轉(zhuan)換(huan)開(kai)關轉(zhuan)為(wei)電(dian)(dian)池(chi)逆變供電(dian)(dian)。其(qi)特點是(shi)：結構簡單，體(ti)積小，成本低，但輸入(ru)電(dian)(dian)壓(ya)范圍窄(zhai)，輸出電(dian)(dian)壓(ya)穩定精度(du)差，有切換(huan)時間，且(qie)輸出波形一(yi)般為(wei)方波。

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2、在線互動式UPS

在市(shi)(shi)電(dian)正常(chang)時直接(jie)由市(shi)(shi)電(dian)向負載(zai)供電(dian)，當市(shi)(shi)電(dian)偏低或偏高時，通過UPS內(nei)部穩壓(ya)(ya)線(xian)路穩壓(ya)(ya)后輸出(chu)，當(dang)市電(dian)異常或停(ting)電(dian)時(shi)，通過轉換開關轉為電(dian)池(chi)逆變(bian)供電(dian)。其特點(dian)是：有較(jiao)寬(kuan)的輸入電(dian)壓(ya)(ya)范圍，噪音低，體(ti)積小等(deng)特點(dian)，但同樣存在切(qie)換時(shi)間(jian)。

3、在線式UPS

在市電(dian)(dian)(dian)(dian)正常(chang)時，由市電(dian)(dian)(dian)(dian)進行整流(liu)提供直流(liu)電(dian)(dian)(dian)(dian)壓給逆(ni)變器工作(zuo)，由逆(ni)變器向負載提供交流(liu)電(dian)(dian)(dian)(dian)，在市電(dian)(dian)(dian)(dian)異常(chang)時，逆(ni)變器由電(dian)(dian)(dian)(dian)池提供能(neng)量，逆(ni)變器始終處于(yu)工作(zuo)狀態，保(bao)證無間斷輸出。其特(te)點是(shi)，有極(ji)寬的(de)輸入(ru)電(dian)(dian)(dian)(dian)壓范(fan)圍(wei)，無切換時間且輸出電(dian)(dian)(dian)(dian)壓穩(wen)定精度高(gao)，特(te)別適合(he)(he)對電(dian)(dian)(dian)(dian)源要求(qiu)較高(gao)的(de)場合(he)(he)，但(dan)是(shi)成本較高(gao)。目前(qian)，功率大于(yu)3KVA的UPS幾乎(hu)都(dou)是在線式UPS。