穩(wen)壓電(dian)路的(de)作用(yong)是為電(dian)路提供更加穩(wen)定的(de)直(zhi)流(liu)(liu)電(dian)。整流(liu)(liu)濾(lv)波電(dian)路的(de)輸出電(dian)壓和(he)理(li)想(xiang)直(zhi)流(liu)(liu)電(dian)源還有一定的(de)差距，主要因為兩方面的(de)原因

:第(di)一，當負載電流(liu)發(fa)生變化(hua)(hua)時，由于整流(liu)濾波電路存在(zai)內阻，輸出(chu)的直流(liu)電壓將會隨之(zhi)發(fa)生變化(hua)(hua);

第二(er)，當電網(wang)電壓有波動時(shi)，整流電路的輸(shu)出電壓與(yu)變(bian)壓器副邊電壓有直(zhi)接的關系(xi)，因此輸(shu)出直(zhi)流電壓也會發(fa)生變(bian)化。

   UPS給電池充電，再通(tong)過電池給負載供(gong)電；EPS在有市(shi)電的(de)情況下用市(shi)電供(gong)電，同時給電池充電，在沒(mei)有市(shi)電（停電）時通(tong)過逆變器給負載供(gong)電。

   不(bu)同(tong)點：UPS供(gong)電(dian)(dian)(dian)(dian)在市電(dian)(dian)(dian)(dian)停(ting)電(dian)(dian)(dian)(dian)時負載用(yong)電(dian)(dian)(dian)(dian)不(bu)會中斷，EPS供(gong)電(dian)(dian)(dian)(dian)在市電(dian)(dian)(dian)(dian)停(ting)電(dian)(dian)(dian)(dian)時負載用(yong)電(dian)(dian)(dian)(dian)會短時間斷電(dian)(dian)(dian)(dian)后(hou)才能切換(huan)到電(dian)(dian)(dian)(dian)池(chi)供(gong)電(dian)(dian)(dian)(dian)（通(tong)過逆變器）。

用途：

    UPS主要用在不能突然斷電(dian)的地方，比如地鐵站(zhan)的閘機（進(jin)出(chu)站(zhan)票機）；

    EPS主要用在(zai)應(ying)急照明方面，比如一些公共場所的照明，為了避(bi)免在(zai)突然斷電時不引(yin)起恐慌都會需要EPS照明。

      UPS電(dian)(dian)源(yuan)濾波(bo)(bo)器(qi)解決UPS電(dian)(dian)源(yuan)諧(xie)波(bo)(bo)問題。濾除(chu)UPS電(dian)(dian)源(yuan)產(chan)生的諧(xie)波(bo)(bo)，諧(xie)波(bo)(bo)電(dian)(dian)流畸(ji)變(bian)率降到5%~10%。UPS電(dian)(dian)源(yuan)濾波(bo)(bo)器(qi)提高(gao)系(xi)統可靠性(xing)，有效降低重負(fu)荷時負(fu)荷率，減(jian)小視在電(dian)(dian)流，抑制(zhi)諧(xie)波(bo)(bo)畸(ji)變(bian)，降低暫態過電(dian)(dian)壓(ya)，減(jian)小電(dian)(dian)壓(ya)電(dian)(dian)流變(bian)化率，保證用電(dian)(dian)可靠性(xing)。

       UPS電源濾波器可(ke)以提(ti)高(gao)(gao)UPS節能(neng)現象，不(bu)僅提(ti)高(gao)(gao)功率因數，減少視(shi)在電流，又(you)可(ke)以明顯降低高(gao)(gao)次諧(xie)波畸變，減少高(gao)(gao)次諧(xie)波損耗。