常見的3類UPS電源

UPS按工(gong)作(zuo)原理分成后備(bei)式、在(zai)(zai)線式與(yu)在(zai)(zai)線互動式三大類。

1、后備式UPS

在市電正常(chang)時(shi)直接(jie)由市電向負載供(gong)電，當市電超出(chu)其工(gong)作范圍(wei)或(huo)停電時(shi)，通(tong)過轉(zhuan)換(huan)開關(guan)轉(zhuan)為(wei)電池逆變(bian)供(gong)電。其特點(dian)是：結構簡單，體積小，成本低，但輸入電壓(ya)范圍(wei)窄(zhai)，輸出(chu)電壓(ya)穩定精度差，有切換(huan)時(shi)間，且輸出(chu)波形一般為(wei)方(fang)波。

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2、在線互動式UPS

在市電(dian)正常時直接由市電(dian)向(xiang)負載供(gong)電(dian)，當市電(dian)偏低或偏高(gao)時，通過UPS內部穩壓(ya)線路穩壓(ya)后輸出，當市(shi)電(dian)(dian)(dian)異(yi)常或(huo)停電(dian)(dian)(dian)時(shi)(shi)，通(tong)過轉換開(kai)關轉為電(dian)(dian)(dian)池逆變供電(dian)(dian)(dian)。其(qi)特點是：有較寬的輸入電(dian)(dian)(dian)壓(ya)范圍，噪音(yin)低，體積小等特點，但(dan)同(tong)樣存在切換時(shi)(shi)間。

3、在線式UPS

在(zai)市電(dian)(dian)正常時(shi)，由市電(dian)(dian)進行整流提(ti)供(gong)(gong)(gong)直流電(dian)(dian)壓給(gei)逆變(bian)器(qi)工作(zuo)，由逆變(bian)器(qi)向負(fu)載提(ti)供(gong)(gong)(gong)交流電(dian)(dian)，在(zai)市電(dian)(dian)異常時(shi)，逆變(bian)器(qi)由電(dian)(dian)池提(ti)供(gong)(gong)(gong)能(neng)量，逆變(bian)器(qi)始終處(chu)于工作(zuo)狀態，保證無(wu)(wu)間斷輸出。其特(te)點是，有(you)極寬的輸入電(dian)(dian)壓范圍，無(wu)(wu)切換(huan)時(shi)間且輸出電(dian)(dian)壓穩定精(jing)度高，特(te)別適合對電(dian)(dian)源要(yao)求(qiu)較(jiao)高的場合，但是成本較(jiao)高。目前，功率(lv)大于3KVA的UPS幾乎都是在線式UPS。