小(xiao)功(gong)率(lv)的(de)開(kai)關(guan)電(dian)源(yuan)適(shi)配(pei)器(qi)在(zai)進(jin)行(xing)傳(chuan)導(dao)幹(gan)擾(rao)測(ce)試(shi)時(shi)，由(you)於(yu)本(ben)身(shen)的(de)功(gong)率(lv)比(bi)較(jiao)小(xiao)，所(suo)接(jie)收(shou)到(dao)的(de)輻(fu)射(she)信(xin)號(hao)強(qiang)度(du)也(ye)比(bi)大(da)功(gong)率(lv)的(de)適(shi)配(pei)器(qi)弱(ruo)很(hen)多(duo)
，因(yin)此(ci)在(zai)測(ce)試(shi)的(de)過(guo)程(cheng)中(zhong)工(gong)程(cheng)師(shi)需(xu)要(yao)全(quan)麵(mian)參(can)考(kao)傳(chuan)導(dao)幹(gan)擾(rao)的(de)幅(fu)值(zhi)大(da)小(xiao)
，在(zai)設(she)計(ji)時(shi)就(jiu)需(xu)要(yao)充(chong)分(fen)考(kao)慮(lv)到(dao)電(dian)磁(ci)幹(gan)擾(rao)所(suo)產(chan)生(sheng)的(de)影(ying)響(xiang)。下(xia)麵(mian)我(wo)們(men)將(jiang)會(hui)通(tong)過(guo)對(dui)小(xiao)功(gong)率(lv)電(dian)源(yuan)適(shi)配(pei)器(qi)通(tong)用(yong)機(ji)理(li)的(de)分(fen)析(xi)，進(jin)一(yi)步(bu)解(jie)釋(shi)電(dian)磁(ci)幹(gan)擾(rao)和(he)噪(zao)聲(sheng)的(de)產(chan)生(sheng)原(yuan)因(yin)。

 

目前我國所生產的小功率開關電源，其運行的基本原理按電路結構不同，可以細分為串並聯式和直流變換式，相關的框圖如下圖所示。

圖為開關電源適配器的原理框圖

 

youshangtukeyikanchu，shidianjingguoyicizhengliulvbohoujianghuibianchengzhiliudianya
，bingtongguodianluxitongshusongdaokaiguannibiandianlu。nibiandianlujiangzhiliubianchengjibaihezidaojiqianhezidegaopinjuxingbo，gaopinjuxingbotongguogaopinbianyaqiouhedaoercixianquanyidedaoxiaodianyajiaoliudian
， 此ci交jiao流liu電dian經jing過guo二er次ci整zheng流liu濾lv波bo後hou輸shu出chu以yi驅qu動dong負fu載zai。同tong時shi
，該gai輸shu出chu經jing過guo誤wu差cha放fang大da電dian路lu采cai樣yang取qu得de的de輸shu出chu電dian壓ya值zhi又you回hui饋kui給gei脈mai衝chong控kong製zhi電dian路lu。脈mai衝chong控kong製zhi電dian路lu將jiang回hui饋kui的de電dian壓ya值zhi與yu基ji準zhun電dian壓ya值zhi比bi對dui後hou得de出chu一yi個ge脈mai衝chong占zhan空kong比bi的de相xiang應ying改gai變bian動dong作zuo，在zai開kai關guan動dong作zuo過guo程cheng中zhong會hui產chan生sheng很hen強qiang的de噪zao聲sheng
，它ta們men通tong過guo電dian源yuan線xian以yi共gong模mo或huo者zhe差cha模mo方fang式shi向xiang外wai傳chuan導dao。這zhe也ye是shi目mu前qian大da部bu分fen小xiao型xing電dian源yuan適shi配pei器qi出chu現xian噪zao聲sheng問wen題ti的de最zui大da原yuan因yin所suo在zai。

 

 

chuleshangwenzhongtijidezaoshengchanshengyuanyinzhiwai，kaiguandianyuanshipeiqiyeshiyigefeichangmingandeqijian，youdianwangqinrudewaibuzaoshengchuandidaoneibudianzidianluguochengzhongyehuichanshengganrao。suoyizaishejiyikuankaiguandianyuanzhichujiuyinggaikaolvdaodianciganrao。