濾波電容器是EMC設計電路中非常常見的身影，也是消滅電磁干擾的一大利器。關于濾波電容器在電路中的作用，有些朋友可能不是特別的清楚，在這里電源適配器廠家簡單的為大家分(fen)析一(yi)下(xia)原(yuan)理。

盡管從(cong)濾(lv)(lv)除(chu)高頻噪(zao)聲的(de)(de)(de)(de)(de)角度(du)看，電(dian)(dian)容(rong)的(de)(de)(de)(de)(de)諧(xie)振(zhen)是(shi)不(bu)(bu)希望的(de)(de)(de)(de)(de)，但是(shi)電(dian)(dian)容(rong)的(de)(de)(de)(de)(de)諧(xie)振(zhen)并(bing)不(bu)(bu)是(shi)總是(shi)有害的(de)(de)(de)(de)(de)。當要濾(lv)(lv)除(chu)的(de)(de)(de)(de)(de)噪(zao)聲頻率確定時，可(ke)以(yi)通過調(diao)整電(dian)(dian)容(rong)的(de)(de)(de)(de)(de)容(rong)量，使諧(xie)振(zhen)點剛好落(luo)在(zai)騷擾頻率上(shang)。在(zai)實際工程中，要濾(lv)(lv)除(chu)的(de)(de)(de)(de)(de)電(dian)(dian)磁噪(zao)聲頻率往往高達數百MHz，甚至超(chao)過1GHz。對這(zhe)樣高頻的(de)(de)(de)(de)(de)電(dian)(dian)磁噪(zao)聲必須使用穿心電(dian)(dian)容(rong)才(cai)能有效(xiao)(xiao)地濾(lv)(lv)除(chu)。普通電(dian)(dian)容(rong)之所以(yi)不(bu)(bu)能有效(xiao)(xiao)地濾(lv)(lv)除(chu)高頻噪(zao)聲，是(shi)因(yin)為兩(liang)個原因(yin)，一個原因(yin)是(shi)電(dian)(dian)容(rong)引線(xian)電(dian)(dian)感造成電(dian)(dian)容(rong)諧(xie)振(zhen)，對高頻信號呈現較大的(de)(de)(de)(de)(de)阻抗(kang)，削(xue)弱了對高頻信號的(de)(de)(de)(de)(de)旁路(lu)作用;另一個原因(yin)是(shi)導(dao)線(xian)之間的(de)(de)(de)(de)(de)寄生(sheng)電(dian)(dian)容(rong)使高頻信號發生(sheng)耦(ou)合，降低了濾(lv)(lv)波效(xiao)(xiao)果(guo)。

穿(chuan)(chuan)(chuan)心(xin)電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)之(zhi)所(suo)以能(neng)有(you)(you)(you)效地濾除高(gao)頻(pin)噪聲(sheng)，是(shi)因為穿(chuan)(chuan)(chuan)心(xin)電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)不僅沒有(you)(you)(you)引線電(dian)(dian)(dian)(dian)感(gan)造(zao)成(cheng)電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)諧振頻(pin)率過低(di)的(de)(de)問(wen)(wen)題，而且(qie)穿(chuan)(chuan)(chuan)心(xin)電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)可以直接安裝在金屬(shu)面板上，利(li)用金屬(shu)面板起到高(gao)頻(pin)隔離的(de)(de)作用。但是(shi)在使用穿(chuan)(chuan)(chuan)心(xin)電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)時，要注意的(de)(de)問(wen)(wen)題是(shi)安裝問(wen)(wen)題。穿(chuan)(chuan)(chuan)心(xin)電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)最大的(de)(de)弱點是(shi)怕高(gao)溫(wen)和溫(wen)度沖擊，這(zhe)在將(jiang)穿(chuan)(chuan)(chuan)心(xin)電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)往金屬(shu)面板上焊接時造(zao)成(cheng)很(hen)大困難(nan)。許多電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)在焊接過程中(zhong)發(fa)生損壞(huai)。特別是(shi)當需要將(jiang)大量的(de)(de)穿(chuan)(chuan)(chuan)心(xin)電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)安裝在面板上時，只要有(you)(you)(you)一個(ge)損壞(huai)，就(jiu)很(hen)難(nan)修復，因為在將(jiang)損壞(huai)的(de)(de)電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)拆下(xia)時，會造(zao)成(cheng)鄰(lin)近其它電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)的(de)(de)損壞(huai)。

飛天鷹電源適配器廠家是國家高新技術企業有著十五年的電源研發和生產經驗，積累了豐富的電源技術，可以設計滿足多種要求的電源方案。飛天鷹電源產品已全部通過六級能效、UL、CE、CB、FCC、GS、CCC、PSE、SAA、KC、BSMI等(deng)多種認證齊(qi)全，歡(huan)迎來電咨詢。