EMI濾波器的主要特性和日常應用有哪些呢？下面就由EMI濾波器廠家的小編為大家介紹一下。
電(dian)子(zi)設備的(de)供電(dian)電(dian)源，如220V/50Hz交流(liu)電(dian)網或115V/400Hz交流(liu)發電(dian)機，都存(cun)在各(ge)式各(ge)樣的(de)EMI噪聲(sheng)，其中(zhong)人為(wei)的(de)EMI干(gan)(gan)擾(rao)源，如各(ge)種雷達、導航(hang)、通信等(deng)設備的(de)無線(xian)電(dian)發射(she)信號，會(hui)在電(dian)源線(xian)上和(he)(he)電(dian)子(zi)設備的(de)連接(jie)電(dian)纜上感應出電(dian)磁干(gan)(gan)擾(rao)信號，電(dian)動旋轉機械和(he)(he)點火(huo)系統，會(hui)在感性負載電(dian)路內產(chan)生瞬態(tai)過程和(he)(he)輻射(she)噪聲(sheng)干(gan)(gan)擾(rao)；還有自(zi)然干(gan)(gan)擾(rao)源，比如雷電(dian)放電(dian)現象和(he)(he)宇宙中(zhong)天電(dian)干(gan)(gan)擾(rao)噪聲(sheng)，前者(zhe)的(de)持續時(shi)間短但能量很大，后者(zhe)的(de)頻(pin)率(lv)范(fan)圍很寬。另外電(dian)子(zi)電(dian)路元器件本身工(gong)作(zuo)時(shi)也會(hui)產(chan)生熱(re)噪聲(sheng)等(deng)。
EMI噪(zao)聲(sheng)(sheng)(sheng)(sheng)和濾波器的類(lei)型，在(zai)(zai)(zai)電(dian)(dian)(dian)源設備輸(shu)(shu)(shu)入(ru)引(yin)(yin)線上存(cun)在(zai)(zai)(zai)二種EMI噪(zao)聲(sheng)(sheng)(sheng)(sheng)：共(gong)模噪(zao)聲(sheng)(sheng)(sheng)(sheng)和差模噪(zao)聲(sheng)(sheng)(sheng)(sheng)，把在(zai)(zai)(zai)交(jiao)流(liu)(liu)輸(shu)(shu)(shu)入(ru)引(yin)(yin)線與地之間存(cun)在(zai)(zai)(zai)的EMI噪(zao)聲(sheng)(sheng)(sheng)(sheng)叫(jiao)作(zuo)(zuo)其共(gong)模噪(zao)聲(sheng)(sheng)(sheng)(sheng)，它可看(kan)作(zuo)(zuo)為在(zai)(zai)(zai)交(jiao)流(liu)(liu)輸(shu)(shu)(shu)入(ru)線上傳輸(shu)(shu)(shu)的電(dian)(dian)(dian)位(wei)相(xiang)(xiang)等、相(xiang)(xiang)位(wei)相(xiang)(xiang)同的干擾(rao)信號(hao)，而把交(jiao)流(liu)(liu)輸(shu)(shu)(shu)入(ru)引(yin)(yin)線之間存(cun)在(zai)(zai)(zai)的EMI噪(zao)聲(sheng)(sheng)(sheng)(sheng)叫(jiao)作(zuo)(zuo)差模噪(zao)聲(sheng)(sheng)(sheng)(sheng)，它可看(kan)作(zuo)(zuo)為在(zai)(zai)(zai)交(jiao)流(liu)(liu)輸(shu)(shu)(shu)入(ru)線傳輸(shu)(shu)(shu)的相(xiang)(xiang)位(wei)差180，的干擾(rao)信號(hao)，即圖(tu)1中的電(dian)(dian)(dian)壓(ya)V3。共(gong)模噪(zao)聲(sheng)(sheng)(sheng)(sheng)是(shi)從交(jiao)流(liu)(liu)輸(shu)(shu)(shu)入(ru)線流(liu)(liu)入(ru)大地的干擾(rao)電(dian)(dian)(dian)流(liu)(liu)，差模噪(zao)聲(sheng)(sheng)(sheng)(sheng)是(shi)在(zai)(zai)(zai)交(jiao)流(liu)(liu)輸(shu)(shu)(shu)入(ru)線之間流(liu)(liu)動的干擾(rao)電(dian)(dian)(dian)流(liu)(liu)。對任何電(dian)(dian)(dian)源輸(shu)(shu)(shu)入(ru)線上的傳導(dao)EMI噪(zao)聲(sheng)(sheng)(sheng)(sheng)，都可以用共(gong)模和差模噪(zao)聲(sheng)(sheng)(sheng)(sheng)來表示(shi)，并(bing)且(qie)可把這二種EMI噪(zao)聲(sheng)(sheng)(sheng)(sheng)看(kan)作(zuo)(zuo)獨立的EMI源來分別阻止。
電(dian)源(yuan)(yuan)EMI噪聲(sheng)濾(lv)波器是(shi)一種(zhong)無源(yuan)(yuan)低(di)通濾(lv)波器，它無衰減地(di)將交流(liu)(liu)電(dian)傳(chuan)輸到電(dian)源(yuan)(yuan)，而(er)大大衰減隨交流(liu)(liu)電(dian)傳(chuan)入的EMI噪聲(sheng)；同時(shi)又能有效地(di)阻(zu)止(zhi)電(dian)源(yuan)(yuan)設備(bei)產生的EMI噪聲(sheng)，阻(zu)止(zhi)它們進入交流(liu)(liu)電(dian)網(wang)干擾其(qi)它電(dian)子設備(bei)。
以(yi)上就是有關EMI濾波(bo)器的主要特性和日常(chang)應用的內容(rong)了，感(gan)謝(xie)大(da)家(jia)的閱(yue)讀。
