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音響電源濾波器功能作用是什么?

發表時間:2021-02-22 17:28【 閱讀量:-查看手機網址
掃一掃!音響電源濾波器功能作用是什么?掃一掃!

  電源濾波器的性能作用是在抑制電磁噪聲,噪聲的影響可分為以下二種:


  發射(Emissions):是要將由設備產生,影響電源或其他設備的噪聲降到法規(例如FCC part 15)允許值以下,例如由開關電源產生的噪聲。


  抗擾(Immunity):是要將進入設備的噪聲降低到不會使設備出現異常動作的程度,例如用在廣播電臺發射設備中的儀器。


  電源濾波器要抑制的噪聲可分為以下的二種:


  共模:在二條(或多條)電源線都相同的噪聲,可視為電源線對地的噪聲。


  差模:電源線和電源線之間的噪聲。同一個電源濾波器對于共模噪聲及差模噪聲的抑制能力會有所不同,一般會用頻率對應抑制量(以分貝表示)的頻譜來說明。


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