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    1. 深圳市全業電子有限公司歡迎您!

      全業電子:工程師該如何選擇陶瓷氣體放電管?

      作者:admin????來源:未知????發布時間:2020-07-07 09:47????瀏覽量:
      電路防護方案都是工程師根據產品的防護等級以及實際的工作電壓、電流和功率值等設計出來的,防護方案是否有效除了方案設計之外還有一個重要因素——電子保護器件的選型。究竟工程師該如何選擇陶瓷氣體放電管呢?下面防雷專家全業電子就以防雷器件陶瓷氣體放電管為例,來詳細講解陶瓷氣體放電管的選型。

      陶瓷氣體放電管是目前應用最廣泛的一種防雷器件,無論是交直流電源的防雷還是各種信號的防雷,都能起到很好的保護作用。陶瓷放電管用陶瓷密閉封裝,內部由兩個或多個帶間隙的金屬電極,充以惰性氣體氬氣,氖氣構成,當加到兩電極端的電壓達到使氣體放電管內的氣體擊穿時,氣體放電管開始放電,由高阻抗變成低阻抗,使浪涌電壓迅速短路至接近零電壓,并將過電流釋放入地,從而對后續電路起到保護作用。

      陶瓷氣體放電管的選型:   

      ①在快速脈沖沖擊下,陶瓷氣體放電管氣體電離需要一定的時間(一般為0.2~0.3μ s,最快的也有0.1μ s左右),因而有一個幅度較高的尖脈沖會泄漏到后面去。若要抑制這個尖脈沖,有以下幾種方法:a、在放電管上并聯電容器或壓敏電阻;b、在放電管后串聯電感或留一段長度適當的傳輸線,使尖脈沖衰減到較低的電平;c、采用兩級保護電路,以放電管作為第一級,以TVS管或半導體放電管作為第二級,兩級之間用電阻、電感或自恢復保險絲隔離。

      ②直流擊穿電壓Vsdc的選擇:直流擊穿電壓Vsdc的最小值應大于可能出現的最高電源峰值電壓或最高信號電壓的1.2倍以上。

      ③沖擊放電電流的選擇:要根據線路上可能出現的最大浪涌電流或需要防護的最大浪涌電流選擇。放電管沖擊放電電流應按標稱沖擊放電電流(或單次沖擊放電電流的一半)來計算

      ④陶瓷氣體放電管因擊穿電壓誤差較大,一般不作并聯使用。

      ⑤續流問題:為了使放電管在沖擊擊穿后能正常熄弧,在有可能出現續流的地方(如有源電路中),可以在放電管上串聯壓敏電阻或自恢復保險絲等限制續流,使它小于放電管的維持電流。

      歡迎通過官網向我們咨詢!我們將竭誠為您服務!
      陶瓷氣體放電管

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