許多(duo)小伙伴對(dui)于的了解，大多(duo)僅限于共模(mo)電(dian)(dian)(dian)感(gan)是插件電(dian)(dian)(dian)感(gan)中的一款特(te)殊電(dian)(dian)(dian)感(gan)，具(ju)有極高的初始(shi)導磁(ci)率，還有一個別名叫做共模(mo)扼流(liu)圈。實際上(shang)，共模(mo)電(dian)(dian)(dian)感(gan)的實際作用遠比大家想(xiang)象的更多(duo)，更重要(yao)。

除了在(zai)地磁場下具有大的(de)(de)阻抗和插入損(sun)耗(hao)，對若多(duo)干(gan)擾(rao)具有極好的(de)(de)抑制(zhi)作(zuo)用(yong)(yong)外(wai)，在(zai)較寬的(de)(de)頻率范圍內共模(mo)電(dian)(dian)感呈現出無共振插入損(sun)耗(hao)特性(xing)，也正是因為這個(ge)特性(xing)，我們將它(ta)歸納為常用(yong)(yong)于電(dian)(dian)腦的(de)(de)開(kai)關電(dian)(dian)源(yuan)中過濾(lv)共模(mo)的(de)(de)電(dian)(dian)磁干(gan)擾(rao)信(xin)號的(de)(de)電(dian)(dian)感。

這里不(bu)得不(bu)提共(gong)模電(dian)(dian)感(gan)(gan)的(de)老對頭EMI，EMI就是(shi)指電(dian)(dian)磁干擾(rao)(rao).而我們的(de)共(gong)模電(dian)(dian)感(gan)(gan)就專(zhuan)治電(dian)(dian)磁干擾(rao)(rao)，對于(yu)防(fang)EMI可以(yi)說是(shi)得心(xin)應手，共(gong)模電(dian)(dian)感(gan)(gan)為何能防(fang)EMI，小編姜蔥共(gong)模電(dian)(dian)感(gan)(gan)的(de)結構來為大家解(jie)析：

包含的(de)(de)濾波電(dian)(dian)(dian)路(lu)，La和Lb就(jiu)是共(gong)模(mo)電(dian)(dian)(dian)感線(xian)(xian)(xian)(xian)圈(quan)(quan)。這(zhe)兩(liang)個線(xian)(xian)(xian)(xian)圈(quan)(quan)繞在(zai)同(tong)一鐵芯上，匝數和相(xiang)位都相(xiang)同(tong)（繞制反向）。這(zhe)樣，當(dang)電(dian)(dian)(dian)路(lu)中的(de)(de)正常電(dian)(dian)(dian)流(liu)流(liu)經(jing)共(gong)模(mo)電(dian)(dian)(dian)感時，電(dian)(dian)(dian)流(liu)在(zai)同(tong)相(xiang)位繞制的(de)(de)電(dian)(dian)(dian)感線(xian)(xian)(xian)(xian)圈(quan)(quan)中產生(sheng)(sheng)反向的(de)(de)磁場而(er)相(xiang)互抵消，此(ci)(ci)時正常信號電(dian)(dian)(dian)流(liu)主要受線(xian)(xian)(xian)(xian)圈(quan)(quan)電(dian)(dian)(dian)阻(zu)的(de)(de)影(ying)響(xiang)；當(dang)有共(gong)模(mo)電(dian)(dian)(dian)流(liu)流(liu)經(jing)線(xian)(xian)(xian)(xian)圈(quan)(quan)時，由(you)于共(gong)模(mo)電(dian)(dian)(dian)流(liu)的(de)(de)同(tong)向性，會在(zai)線(xian)(xian)(xian)(xian)圈(quan)(quan)內產生(sheng)(sheng)同(tong)向的(de)(de)磁場而(er)增大線(xian)(xian)(xian)(xian)圈(quan)(quan)的(de)(de)感抗，使線(xian)(xian)(xian)(xian)圈(quan)(quan)表(biao)現為高阻(zu)抗，產生(sheng)(sheng)較(jiao)強的(de)(de)阻(zu)尼(ni)效果，以(yi)此(ci)(ci)衰減共(gong)模(mo)電(dian)(dian)(dian)流(liu)，達到濾波的(de)(de)目的(de)(de)。

事(shi)實(shi)上(shang)，將(jiang)這個(ge)濾波(bo)電路(lu)一端接(jie)干(gan)擾源，另一端接(jie)被干(gan)擾設備，則La和C1,Lb和C2就(jiu)構(gou)成兩(liang)組低通濾波(bo)器(qi)，可(ke)以使線路(lu)上(shang)的共模EMI信號(hao)(hao)被控制在很低的電平上(shang)。該電路(lu)既可(ke)以抑制外部的EMI信號(hao)(hao)傳入(ru)，又可(ke)以衰減線路(lu)自身工作(zuo)時產生的EMI信號(hao)(hao)，能(neng)有(you)效地降低EMI干(gan)擾強度。

同時，除了開篇所說(shuo)用(yong)(yong)于電(dian)(dian)(dian)腦開關，共模電(dian)(dian)(dian)感(gan)的應用(yong)(yong)領域還覆(fu)蓋至電(dian)(dian)(dian)感(gan)器，做(zuo)電(dian)(dian)(dian)感(gan)器的主要作用(yong)(yong)是(shi)：降(jiang)壓(ya)、升壓(ya)、耦；做(zuo)變壓(ya)器的主要作用(yong)(yong)是(shi)：Sepic/Flyback；DC/DC轉換 ；輸入輸出端的濾波線

好了，聽(ting)小編介紹了這么多，是不是真的(de)發現共(gong)模(mo)電感(gan)的(de)作用范圍(wei)(wei)以及重要性(xing)超出(chu)了原先的(de)認知(zhi)范圍(wei)(wei)？如(ru)果還有關于電感(gan)方面的(de)問題，也歡迎給我(wo)們留言哦!