電源適(shi)配器(qi)的穩(wen)定(ding)，對于電子設備(bei)總(zong)是有利的，但(dan)必須添置穩(wen)定(ding)電源適配(pei)器。若要(yao)求穩(wen)定(ding)電源適配(pei)器輸出的功(gong)率(lv)大(da)、性能好，則價格(ge)較貴。因此，對于功(gong)率(lv)大(da)、對供(gong)電質量要(yao)求不高(gao)的大(da)多數電力(li)設備(bei)而言，往往以改善電網的供(gong)電質量來解決。

穩(wen)(wen)(wen)(wen)(wen)定(ding)(ding)(ding)電(dian)(dian)源(yuan)適(shi)配器大(da)多被用于電(dian)(dian)視機(ji)、電(dian)(dian)子(zi)計算(suan)機(ji)及其(qi)接口等電(dian)(dian)子(zi)設備和電(dian)(dian)子(zi)儀器中，也(ye)就(jiu)是說上述(shu)設備內(nei)就(jiu)帶有直(zhi)流(liu)(liu)穩(wen)(wen)(wen)(wen)(wen)壓(ya)(ya)電(dian)(dian)源(yuan)適(shi)配器。穩(wen)(wen)(wen)(wen)(wen)定(ding)(ding)(ding)電(dian)(dian)源(yuan)適(shi)配器已成為電(dian)(dian)子(zi)設備中的一(yi)個不可缺(que)少的組(zu)成部分。如果(guo)交(jiao)(jiao)流(liu)(liu)電(dian)(dian)網供電(dian)(dian)質(zhi)量不符合要(yao)求，則除了配置(zhi)(zhi)直(zhi)流(liu)(liu)穩(wen)(wen)(wen)(wen)(wen)定(ding)(ding)(ding)電(dian)(dian)源(yuan)適(shi)配器外，還必須再配置(zhi)(zhi)交(jiao)(jiao)流(liu)(liu)穩(wen)(wen)(wen)(wen)(wen)壓(ya)(ya)電(dian)(dian)源(yuan)適(shi)配器。在(zai)直(zhi)流(liu)(liu)穩(wen)(wen)(wen)(wen)(wen)壓(ya)(ya)前(qian)，預先對(dui)交(jiao)(jiao)流(liu)(liu)電(dian)(dian)源(yuan)適(shi)配器電(dian)(dian)壓(ya)(ya)穩(wen)(wen)(wen)(wen)(wen)定(ding)(ding)(ding)，這(zhe)種穩(wen)(wen)(wen)(wen)(wen)定(ding)(ding)(ding)作用稱為預穩(wen)(wen)(wen)(wen)(wen)，或(huo)稱為前(qian)置(zhi)(zhi)穩(wen)(wen)(wen)(wen)(wen)定(ding)(ding)(ding)。

   用電設備對電源適配器的基本要(yao)(yao)求(qiu)(qiu)，就是電源適配器的輸出電壓(ya)或輸出電流要(yao)(yao)穩(wen)定，除此之外，不(bu)同的用電設備還有各自的特(te)殊(shu)要(yao)(yao)求(qiu)(qiu)，大體有以下幾(ji)項：

   (l)體積(ji)小(xiao)，質量(liang)輕(qing)(qing)。現在隨著大規模集成電(dian)(dian)路的(de)(de)發展，電(dian)(dian)子(zi)設(she)備本身的(de)(de)體積(ji)不斷縮小(xiao)，因此電(dian)(dian)源(yuan)適配器的(de)(de)體積(ji)也(ye)要小(xiao)，以與(yu)之(zhi)相(xiang)稱。特別是移動式的(de)(de)電(dian)(dian)子(zi)設(she)備，必須要求其電(dian)(dian)源(yuan)適配器體積(ji)小(xiao)，質量(liang)輕(qing)(qing)。

   (2)電(dian)(dian)(dian)源適配(pei)器(qi)(qi)輸出(chu)(chu)不(bu)問斷。隨(sui)著(zhu)微型計算機(ji)應用(yong)的日益(yi)普(pu)及和處理技術(shu)的不(bu)斷發展，對(dui)高質量的供電(dian)(dian)(dian)提出(chu)(chu)了越來(lai)越嚴格(ge)的要(yao)求。在微型計算機(ji)的運(yun)行期間中斷供電(dian)(dian)(dian)，將(jiang)會導致隨(sui)機(ji)存儲器(qi)(qi)中數(shu)據的丟失和程序的破(po)壞。因此要(yao)求一旦市電(dian)(dian)(dian)發生瞬(shun)時(shi)斷電(dian)(dian)(dian)時(shi)，能在小于(yu)10 ms的時(shi)間間隔(ge)內重新(xin)供電(dian)(dian)(dian)。對(dui)于(yu)無人值守的電(dian)(dian)(dian)子設備(bei)（如通信設備(bei)）來(lai)說，也需要(yao)電(dian)(dian)(dian)源適配(pei)器(qi)(qi)輸出(chu)(chu)。

沒(mei)有穩(wen)定(ding)的電源(yuan)適配器支持(chi)(chi)，配置再好的電子產品，性(xing)能也(ye)無從發揮。而想要(yao)(yao)得到穩(wen)定(ding)的電力支持(chi)(chi)，好品質的電源(yuan)是必不可少的。所以，電源(yuan)適配器對整套系統(tong)來說是極(ji)為重要(yao)(yao)的。