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    1. 深圳市全業電子有限公司歡迎您!

      全業電子:電路防護方案設計中如何防范過電流影響

      作者:admin????來源:未知????發布時間:2020-07-20 11:30????瀏覽量:
      當電路中的電流超過電路或連接至電路的設備的額定電流容量時,就會產生過電流。無論你設計的電路防護方案是用于汽車電子、消費類電子產品還是以太網的電路防護,過電流對你正在開發的技術的可靠性和耐用性都將是一個很大的威脅。過電流最可能發生在什么時候呢?全業電子的FAE技術工程師經過測試得出來的結論是在不良連接、接地故障、短路或浪涌功率消耗時,都會造成過電流。

          在功率密度增大、器件小型化、保護要求及時準確精細、防范等級提高等一系列矛盾的綜合要求下,電子工程師在電路防護方案設計中的電子保護器件選型自然要更為慎重。過流器件以熔斷器和自恢復保險絲為主,熔斷器和保險絲各自具有工作特性和優勢,工程師該如何取舍呢?

      同為過流保護器件,兩者最大的區別是自恢復保險絲能夠自動恢復,而熔斷器在跳閘之后需要對其進行更換。在過流事件發生后,自恢復保險絲會顯著增加其電阻,從而形成電流保護。

          在電流過載條件下,熔斷器可以通過熔斷而為分立元件或完整電路提供可靠的保護;保險絲分為傳統熔斷型保險絲和自恢復保險絲為主,白熾燈中的保險絲就是熔斷型保險絲,一旦熔斷就要更換,只能提供一次防護,明顯不能滿足智能時代的過電流防護需求,也因此能夠循環使用的自恢復保險絲自然成為眾多工程師在設計過電流防護方案的首選。此外,自恢復保險絲也有助于維持較低的保修和服務成本、持續的系統正常運作以及用戶透明度,特別是在難以接近或者是位置偏遠的電路中,通常也會選用自恢復保險絲,因為在這些條件下熔斷器更換更為不方便。

          在過流防護方案設計時,在進行熔斷器和自恢復保險絲的選型時,還應該參考其他的幾個工作特征,并且最好是能夠在方案設計中及時的對PTC器件的性能和參數進行測試和驗證,確保防護方案的有效性。
          
          如需了解更多產品詳情,請點擊客服商橋咨詢或直接撥打電話075582965089與我們聯系!期待您的光臨!


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