在線互動式UPS電源的工作原理
UPS是一種即使在市電停電的情況下,也能為用電設備提供持續的穩壓穩頻的交流電輸出的電源裝置。UPS通常帶有儲能裝置,根據工作方式,輸出容量,相數等的不同,UPS電源可以分為很(hen)多(duo)種類。根據工作方式(shi)(shi),分為后(hou)備式(shi)(shi)、在線(xian)互動(dong)式(shi)(shi)及在線(xian)式(shi)(shi)三大類。在線(xian)互動(dong)式(shi)(shi)UPS,又(you)稱互動(dong)式(shi)(shi)UPS,在市電(dian)(dian)(dian)(dian)正常時(shi)(shi)直(zhi)接(jie)由市電(dian)(dian)(dian)(dian)向(xiang)負載供電(dian)(dian)(dian)(dian),當市電(dian)(dian)(dian)(dian)偏(pian)低或(huo)偏(pian)高時(shi)(shi),通過UPS內部(bu)穩壓(ya)線(xian)路(lu)穩壓(ya)后(hou)輸出(chu),當市電(dian)(dian)(dian)(dian)異常或(huo)停電(dian)(dian)(dian)(dian)時(shi)(shi),通過轉(zhuan)換開(kai)關轉(zhuan)為電(dian)(dian)(dian)(dian)池(chi)逆變供電(dian)(dian)(dian)(dian)。
在(zai)(zai)線(xian)互(hu)動式(shi)(shi)(shi)UPS電(dian)源是介于后備(bei)式(shi)(shi)(shi)UPS和在(zai)(zai)線(xian)式(shi)(shi)(shi)UPS工(gong)作方式(shi)(shi)(shi)之間的UPS設(she)備(bei),它(ta)集中了(le)后備(bei)式(shi)(shi)(shi)UPS效率高和在(zai)(zai)線(xian)式(shi)(shi)(shi)UPS供電(dian)質量高的優點(dian)。在(zai)(zai)線(xian)互(hu)動式(shi)(shi)(shi)UPS電(dian)源轉換時(shi)間在(zai)(zai)0.4毫秒,一般要求(qiu)不高的設(she)備(bei)可(ke)以推薦使用在(zai)(zai)線(xian)互(hu)動式(shi)(shi)(shi)UPS。
在線(xian)(xian)互動式UPS電源在市電正常時(shi)直接(jie)由市電向負載供電,當市電偏(pian)低或偏(pian)高時(shi),通過UPS內(nei)部(bu)穩(wen)(wen)壓線(xian)(xian)路穩(wen)(wen)壓后輸(shu)出,當市電異常或停電時(shi),通過轉(zhuan)換開關轉(zhuan)為(wei)(wei)電池逆變供電。有較(jiao)寬的輸(shu)入(ru)電壓范圍,噪音(yin)低,體積(ji)小等特點,但同樣存在切換時(shi)間。在線(xian)(xian)互動式UPS電源結合了(le)后備式和在線(xian)(xian)式其優(you)點,具(ju)有價格低廉、后期(qi)維護成本低、0ms轉(zhuan)換等特點,其工(gong)作狀態也可(ke)分為(wei)(wei)市電正常狀態與市電異常狀態。
在線互動式UPS電源的優缺點
與后備式(shi)UPS相(xiang)比,在(zai)線互動(dong)式(shi)UPS的保護(hu)功(gong)能較強(qiang),逆變器輸(shu)出電壓(ya)(ya)波形較好,一般為正(zheng)(zheng)弦(xian)波,而(er)其最大(da)的優點是(shi)具有較強(qiang)的軟(ruan)件功(gong)能,可以方便(bian)地(di)上網(wang),進行(xing)UPS的遠程控制和智能化管理。可自動(dong)偵測外部輸(shu)入(ru)電壓(ya)(ya)是(shi)否處于(yu)正(zheng)(zheng)常范圍之內,如有偏差(cha)可由穩(wen)壓(ya)(ya)電路升壓(ya)(ya)或降壓(ya)(ya),提(ti)供(gong)比較穩(wen)定的正(zheng)(zheng)弦(xian)波輸(shu)出電壓(ya)(ya)。
而且它與計(ji)算機之(zhi)間可以通過數據(ju)接口(如RS-232串口)進行數據(ju)通訊,通過監控軟(ruan)件,用戶(hu)可直接從電腦屏(ping)幕(mu)上監控電源及UPS狀況,簡(jian)化、方便管理(li)工作,并可提高計(ji)算機系(xi)統的可靠性。
這種在線互動式(shi)UPS集中了后備式(shi)UPS效率高(gao)和在線式(shi)UPS供電質量高(gao)的(de)優點,但其穩頻特性能不是十分理想,不適合做常延時(shi)的(de)UPS電源。
在線互動式UPS與在線式UPS電源區別
在(zai)(zai)(zai)線(xian)式UPS電(dian)源在(zai)(zai)(zai)很寬的電(dian)壓(ya)范圍(wei)內,兩級變換(huan),不(bu)管輸入幅值(zhi)或者(zhe)頻(pin)率變化(hua),輸出(chu)都是穩定的電(dian)壓(ya)和(he)頻(pin)率。在(zai)(zai)(zai)線(xian)互動式UPS大(da)多(duo)數情況(kuang)下(xia)工作在(zai)(zai)(zai)旁(pang)路(lu),輸入電(dian)壓(ya)或者(zhe)頻(pin)率有變化(hua)的時(shi)候,輸出(chu)和(he)輸入一樣,和(he)在(zai)(zai)(zai)線(xian)式UPS電(dian)源相(xiang)比(bi)差遠了。