一、線性電源和開關電源的區別
1、線性電源和開關電源原理上的區別
線性電源(Linear power supply)是先(xian)將交流電經過變壓器降低電壓幅值,再經(jing)過整(zheng)流電路整流(liu)后,得(de)到(dao)脈沖直流(liu)電,后經濾波得到帶(dai)有微小波紋電壓的直流(liu)電(dian)壓。要(yao)達到(dao)高精(jing)度的直流(liu)電(dian)壓,必須經過穩壓電(dian)路進行(xing)穩壓(ya)。
開關電(dian)(dian)源(yuan)的(de)工作(zuo)壓力是輸入端直接將整流電(dian)(dian)變成交流電(dian)(dian),再在(zai)(zai)高(gao)頻電(dian)(dian)路震蕩的(de)作(zuo)用下(xia)(xia),用開關管制電(dian)(dian)流的(de)通(tong)斷,形(xing)成高(gao)頻脈沖電(dian)(dian)流。在(zai)(zai)電(dian)(dian)感的(de)幫助(zhu)下(xia)(xia),輸出穩定的(de)低壓直流電(dian)(dian)。
2、開關電源和線性電源應用上的區別
線性(xing)電源(yuan):功率(lv)(lv)器件(jian)工(gong)作在(zai)線性(xing)狀(zhuang)態,也(ye)就(jiu)是說它一用起來(lai)功率(lv)(lv)器件(jian)就(jiu)是一直在(zai)工(gong)作,所以也(ye)就(jiu)導(dao)致其工(gong)作效率(lv)(lv)低,一般在(zai)50%~60%。線性(xing)電源(yuan)的工(gong)作方(fang)式,使它從高壓變低壓必須有將壓裝置,一般的都是變壓器,也(ye)有別的像KX電源(yuan),再(zai)經過整流輸出(chu)直流電壓。
開關(guan)(guan)(guan)電(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan):它的功率(lv)(lv)(lv)器件工(gong)作在開關(guan)(guan)(guan)狀(zhuang)態,(一(yi)(yi)(yi)開一(yi)(yi)(yi)關(guan)(guan)(guan),一(yi)(yi)(yi)開一(yi)(yi)(yi)關(guan)(guan)(guan),頻率(lv)(lv)(lv)非常快,一(yi)(yi)(yi)般的平板開關(guan)(guan)(guan)電(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)頻率(lv)(lv)(lv)在100~200KHz,模塊電(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)在300~500KHZ)、這(zhe)樣損耗小(xiao),效率(lv)(lv)(lv)高,效率(lv)(lv)(lv)80%~90%、、開關(guan)(guan)(guan)電(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)的效率(lv)(lv)(lv)高體積小(xiao),但(dan)是和(he)線性(xing)電(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)比其紋波(bo),電(dian)(dian)(dian)(dian)壓電(dian)(dian)(dian)(dian)流調整率(lv)(lv)(lv)就有折扣(kou)了?。
二、開關電源的優缺點
優點:體積小(xiao)、重量輕(體積和重量只(zhi)有(you)線性電源的(de)20~30%)、效率高(一般為60~70%,而線性電源只(zhi)有(you)30~40%)、自身抗干擾(rao)性強、輸出電壓范(fan)圍(wei)寬、模塊化。
缺點:對(dui)周圍(wei)設備有一(yi)定的干擾。
三、線性電源的優缺點
優點;結構相對簡(jian)單,輸出(chu)波紋小(xiao)(xiao),高頻干擾小(xiao)(xiao)。維修方便
缺點:需要龐大(da)而笨重的變壓器,調(diao)整(zheng)管的功耗大(da),轉(zhuan)換(huan)效率低。