人們在開關電源技術(shu)領域是邊開發相關電力電子器件，邊開發開關變頻技術(shu)，兩(liang)者相互促進推動著開關電源每(mei)年以(yi)超過(guo)兩(liang)位數字的(de)(de)增長率(lv)向著輕、小(xiao)、薄、低(di)噪聲、高(gao)可靠(kao)、抗干擾的(de)(de)方(fang)向發展。開關電源可分為AC/DC和DC/DC兩(liang)大(da)類。

微型低功率開關電(dian)源(yuan)
　　開(kai)關(guan)(guan)電(dian)源(yuan)(yuan)正在走向大(da)眾化，微型化。開(kai)關(guan)(guan)電(dian)源(yuan)(yuan)將逐(zhu)步(bu)取代變(bian)壓器(qi)(qi)在生活中的(de)所有應用(yong)，低(di)功率(lv)微型開(kai)關(guan)(guan)電(dian)源(yuan)(yuan)的(de)應用(yong)要首先體現在，數顯表(biao)(biao)、智(zhi)能(neng)電(dian)表(biao)(biao)、手(shou)機(ji)充電(dian)器(qi)(qi)等(deng)方面。現階(jie)段國家在大(da)力(li)推廣智(zhi)能(neng)電(dian)網建(jian)設，對(dui)電(dian)能(neng)表(biao)(biao)的(de)要求大(da)幅提(ti)高，開(kai)關(guan)(guan)電(dian)源(yuan)(yuan)將逐(zhu)步(bu)取代變(bian)壓器(qi)(qi)在電(dian)能(neng)表(biao)(biao)上面的(de)應用(yong)。
反(fan)轉式(shi)串聯開關電源
　　反(fan)轉(zhuan)(zhuan)式(shi)(shi)串(chuan)聯開(kai)關電(dian)(dian)源(yuan)(yuan)(yuan)(yuan)與(yu)一般(ban)串(chuan)聯式(shi)(shi)開(kai)關電(dian)(dian)源(yuan)(yuan)(yuan)(yuan)的(de)(de)(de)區(qu)別(bie)是，這種(zhong)反(fan)轉(zhuan)(zhuan)式(shi)(shi)串(chuan)聯開(kai)關電(dian)(dian)源(yuan)(yuan)(yuan)(yuan)輸(shu)(shu)出(chu)的(de)(de)(de)電(dian)(dian)壓是負(fu)電(dian)(dian)壓，正好與(yu)一般(ban)串(chuan)聯式(shi)(shi)開(kai)關電(dian)(dian)源(yuan)(yuan)(yuan)(yuan)輸(shu)(shu)出(chu)的(de)(de)(de)正電(dian)(dian)壓極性相(xiang)反(fan)；并且由于儲能電(dian)(dian)感L只(zhi)在開(kai)關K關斷時才向(xiang)負(fu)載輸(shu)(shu)出(chu)電(dian)(dian)流(liu)，因(yin)此，在相(xiang)同條件(jian)下，反(fan)轉(zhuan)(zhuan)式(shi)(shi)串(chuan)聯開(kai)關電(dian)(dian)源(yuan)(yuan)(yuan)(yuan)輸(shu)(shu)出(chu)的(de)(de)(de)電(dian)(dian)流(liu)比串(chuan)聯式(shi)(shi)開(kai)關電(dian)(dian)源(yuan)(yuan)(yuan)(yuan)輸(shu)(shu)出(chu)的(de)(de)(de)電(dian)(dian)流(liu)小一倍。