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電源中運用的EMI濾波器是什么

來源：jincuigu.com.cn 發布時間：2022-02-04 返回
  隨著現代科學技術的飛速開展，電子、電力電子、電氣設備應用越來越普遍，它們在運轉中產生的高密度、寬頻譜的電磁信號充溢整個空間，構成復雜的電磁環境。于是抑止電磁干擾的技術也越來越遭到注重。接地、屏蔽和濾波是抑止電磁干擾的三大措施，下面主要引見在電源中運用的EMI濾波器及其根本原理和正確應用辦法。
  EMI濾波器
  復雜的電(dian)磁環境(jing)請求電(dian)子設(she)備及電(dian)源具有更高的電(dian)磁兼(jian)容性(xing),電(dian)源設(she)備中EMI濾(lv)波(bo)器的作用
  
  電(dian)(dian)(dian)(dian)(dian)子設備(bei)(bei)的供電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)源，如220V/50Hz交流電(dian)(dian)(dian)(dian)(dian)網或(huo)115V/400Hz交流發(fa)電(dian)(dian)(dian)(dian)(dian)機，都存在(zai)形形色色的EMI噪(zao)(zao)聲，其中人為的EMI干擾(rao)源，如各(ge)種雷(lei)達、導航(hang)、通訊等設備(bei)(bei)的無線(xian)電(dian)(dian)(dian)(dian)(dian)發(fa)射(she)信(xin)號(hao)，會在(zai)電(dian)(dian)(dian)(dian)(dian)源線(xian)上和電(dian)(dian)(dian)(dian)(dian)子設備(bei)(bei)的銜(xian)接電(dian)(dian)(dian)(dian)(dian)纜上感(gan)應出電(dian)(dian)(dian)(dian)(dian)磁干擾(rao)信(xin)號(hao)，電(dian)(dian)(dian)(dian)(dian)動旋(xuan)轉(zhuan)機械和點火系(xi)統(tong)，會在(zai)理(li)性負載電(dian)(dian)(dian)(dian)(dian)路內產(chan)生(sheng)瞬態過程(cheng)和輻射(she)噪(zao)(zao)聲干擾(rao)；還有(you)自然干擾(rao)源，比方雷(lei)電(dian)(dian)(dian)(dian)(dian)放電(dian)(dian)(dian)(dian)(dian)現(xian)象和宇宙中天電(dian)(dian)(dian)(dian)(dian)干擾(rao)噪(zao)(zao)聲，前者(zhe)的持續時間短(duan)但能量很(hen)大，后者(zhe)的頻率范圍很(hen)寬。另(ling)外電(dian)(dian)(dian)(dian)(dian)子電(dian)(dian)(dian)(dian)(dian)路元器(qi)件自身工作時也會產(chan)生(sheng)熱(re)噪(zao)(zao)聲等。

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