隨(sui)著(zhu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)子(zi)技(ji)術(shu)(shu)(shu)和(he)開(kai)(kai)(kai)(kai)(kai)關(guan)行業的(de)(de)飛速發展，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)子(zi)設備(bei)與人(ren)們的(de)(de)工作(zuo)、生活(huo)的(de)(de)關(guan)系日(ri)益密(mi)切，而電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)子(zi)設備(bei)都(dou)離不(bu)開(kai)(kai)(kai)(kai)(kai)可靠的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)，進入(ru)(ru)80年代(dai)計算(suan)機電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)全面實現(xian)(xian)了(le)(le)開(kai)(kai)(kai)(kai)(kai)關(guan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)化(hua)，率先完成(cheng)計算(suan)機的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)換代(dai)，進入(ru)(ru)90年代(dai)開(kai)(kai)(kai)(kai)(kai)關(guan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)相繼進入(ru)(ru)各(ge)種電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)子(zi)、電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器設備(bei)領域，程控(kong)(kong)(kong)交換機、通(tong)訊、電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)子(zi)檢測設備(bei)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)、控(kong)(kong)(kong)制(zhi)設備(bei)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)等都(dou)已廣(guang)泛(fan)地(di)使用了(le)(le)開(kai)(kai)(kai)(kai)(kai)關(guan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)，更促進了(le)(le)開(kai)(kai)(kai)(kai)(kai)關(guan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)技(ji)術(shu)(shu)(shu)的(de)(de)迅速發展。開(kai)(kai)(kai)(kai)(kai)關(guan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)是利用現(xian)(xian)代(dai)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)子(zi)技(ji)術(shu)(shu)(shu)，控(kong)(kong)(kong)制(zhi)開(kai)(kai)(kai)(kai)(kai)關(guan)晶(jing)體(ti)管開(kai)(kai)(kai)(kai)(kai)通(tong)和(he)關(guan)斷(duan)的(de)(de)時間比率，維持(chi)穩定輸(shu)(shu)(shu)出電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓的(de)(de)一(yi)種電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)，開(kai)(kai)(kai)(kai)(kai)關(guan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)一(yi)般由(you)脈沖(chong)寬度調制(zhi)（PWM）控(kong)(kong)(kong)制(zhi)IC和(he)MOSFET構成(cheng)。開(kai)(kai)(kai)(kai)(kai)關(guan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)和(he)線性(xing)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)相比，二者的(de)(de)成(cheng)本(ben)都(dou)隨(sui)著(zhu)輸(shu)(shu)(shu)出功(gong)率的(de)(de)增加而增長，但(dan)二者增長速率各(ge)異。線性(xing)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)成(cheng)本(ben)在某(mou)一(yi)輸(shu)(shu)(shu)出功(gong)率點(dian)上，反而高于開(kai)(kai)(kai)(kai)(kai)關(guan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)，這一(yi)成(cheng)本(ben)反轉點(dian)。隨(sui)著(zhu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)子(zi)技(ji)術(shu)(shu)(shu)的(de)(de)發展和(he)創新(xin)，使得開(kai)(kai)(kai)(kai)(kai)關(guan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)技(ji)術(shu)(shu)(shu)在不(bu)斷(duan)地(di)創新(xin)，這一(yi)成(cheng)本(ben)反轉點(dian)日(ri)益向低輸(shu)(shu)(shu)出電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)端(duan)移動，這為(wei)開(kai)(kai)(kai)(kai)(kai)關(guan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)提(ti)供了(le)(le)廣(guang)泛(fan)的(de)(de)發展空間。 
     開(kai)關(guan)電(dian)源高頻化(hua)(hua)是其(qi)發展的(de)方向(xiang)，高頻化(hua)(hua)使(shi)開(kai)關(guan)電(dian)源小型化(hua)(hua)，并使(shi)開(kai)關(guan)電(dian)源進入更廣泛的(de)應用領域，特別是在(zai)高新技(ji)術領域的(de)應用，推動了高新技(ji)術產品的(de)小型化(hua)(hua)、輕便化(hua)(hua)。另(ling)外開(kai)關(guan)電(dian)源的(de)發展與應用在(zai)節(jie)約能(neng)源、節(jie)約資源及(ji)保護環境方面都(dou)具有重要的(de)意義。