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開關電源的工作模式是什么?有什么特點?

2019/9/2 10:32:19??????點擊:

  顧名思義,開關電源就是利用電子(zi)開(kai)關(guan)器(qi)件(如(ru)晶體管(guan)、場效應管(guan)、可(ke)控硅(gui)閘流管(guan)等),通過控制電路,使電子(zi)開(kai)關(guan)器(qi)件不停地“接(jie)通”和“關(guan)斷”,讓電子(zi)開(kai)關(guan)器(qi)件對輸入電壓進行脈(mo)沖調制,從而實(shi)現DC/AC、DC/DC電壓變換,以及輸出(chu)電壓可(ke)調和自動穩壓。

工作模式
  開關(guan)電(dian)(dian)源(yuan)(yuan)(yuan)一般(ban)有(you)三種(zhong)工(gong)(gong)作(zuo)(zuo)(zuo)模(mo)式(shi)(shi):頻率、脈沖(chong)寬度(du)(du)固(gu)定模(mo)式(shi)(shi),頻率固(gu)定、脈沖(chong)寬度(du)(du)可變(bian)模(mo)式(shi)(shi),頻率、脈沖(chong)寬度(du)(du)可變(bian)模(mo)式(shi)(shi)。前(qian)一種(zhong)工(gong)(gong)作(zuo)(zuo)(zuo)模(mo)式(shi)(shi)多(duo)用(yong)于(yu)(yu)DC/AC逆變(bian)電(dian)(dian)源(yuan)(yuan)(yuan),或DC/DC電(dian)(dian)壓變(bian)換;后兩種(zhong)工(gong)(gong)作(zuo)(zuo)(zuo)模(mo)式(shi)(shi)多(duo)用(yong)于(yu)(yu)開關(guan)穩壓電(dian)(dian)源(yuan)(yuan)(yuan)。另外(wai),開關(guan)電(dian)(dian)源(yuan)(yuan)(yuan)輸(shu)(shu)(shu)出(chu)(chu)電(dian)(dian)壓也有(you)三種(zhong)工(gong)(gong)作(zuo)(zuo)(zuo)方(fang)(fang)(fang)式(shi)(shi):直接輸(shu)(shu)(shu)出(chu)(chu)電(dian)(dian)壓方(fang)(fang)(fang)式(shi)(shi)、平均值(zhi)輸(shu)(shu)(shu)出(chu)(chu)電(dian)(dian)壓方(fang)(fang)(fang)式(shi)(shi)、幅值(zhi)輸(shu)(shu)(shu)出(chu)(chu)電(dian)(dian)壓方(fang)(fang)(fang)式(shi)(shi)。同樣(yang),前(qian)一種(zhong)工(gong)(gong)作(zuo)(zuo)(zuo)方(fang)(fang)(fang)式(shi)(shi)多(duo)用(yong)于(yu)(yu)DC/AC逆變(bian)電(dian)(dian)源(yuan)(yuan)(yuan),或DC/DC電(dian)(dian)壓變(bian)換;后兩種(zhong)工(gong)(gong)作(zuo)(zuo)(zuo)方(fang)(fang)(fang)式(shi)(shi)多(duo)用(yong)于(yu)(yu)開關(guan)穩壓電(dian)(dian)源(yuan)(yuan)(yuan)。
  根(gen)據開(kai)(kai)關(guan)(guan)器件在電路中連接的方式(shi)(shi),開(kai)(kai)關(guan)(guan)電源(yuan)(yuan),大體上可分(fen)(fen)為:串聯(lian)式(shi)(shi)開(kai)(kai)關(guan)(guan)電源(yuan)(yuan)、并聯(lian)式(shi)(shi)開(kai)(kai)關(guan)(guan)電源(yuan)(yuan)、變(bian)(bian)壓(ya)(ya)器式(shi)(shi)開(kai)(kai)關(guan)(guan)電源(yuan)(yuan)等三大類(lei)。其中,變(bian)(bian)壓(ya)(ya)器式(shi)(shi)開(kai)(kai)關(guan)(guan)電源(yuan)(yuan)(后面簡稱變(bian)(bian)壓(ya)(ya)器開(kai)(kai)關(guan)(guan)電源(yuan)(yuan))還(huan)可以進一步分(fen)(fen)成(cheng):推挽式(shi)(shi)、半橋式(shi)(shi)、全橋式(shi)(shi)等多(duo)種(zhong);根(gen)據變(bian)(bian)壓(ya)(ya)器的激(ji)(ji)(ji)勵(li)和輸出電壓(ya)(ya)的相位(wei),又可以分(fen)(fen)成(cheng):正激(ji)(ji)(ji)式(shi)(shi)、反激(ji)(ji)(ji)式(shi)(shi)、單激(ji)(ji)(ji)式(shi)(shi)和雙(shuang)激(ji)(ji)(ji)式(shi)(shi)等多(duo)種(zhong);如果從用(yong)途(tu)上來分(fen)(fen),還(huan)可以分(fen)(fen)成(cheng)更多(duo)種(zhong)類(lei)。
主要特點(dian)
  1、體(ti)積小、重(zhong)量(liang)(liang)輕:由于沒有工頻變壓(ya)器,所以體(ti)積和重(zhong)量(liang)(liang)只有線(xian)性電(dian)源的(de)20~30%。
  2、功(gong)耗小、效(xiao)率高:功(gong)率晶體(ti)管工作(zuo)在開關狀態,所以晶體(ti)管上的功(gong)耗小,轉 化(hua)效(xiao)率高,一(yi)般為60~70%,而線性電電源只有30~40%。

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