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          關于霍爾電流傳感器的原理及磁飽和問題

            二、霍爾電流傳感器磁飽和問題
           許多霍爾電流傳感器廠家在其技術資料中也將無磁飽和作為霍爾電流傳感器的一個重要優點來宣傳?;魻栯娏鱾鞲衅鞑粫l生磁飽和幾乎是霍爾電流傳感器自應用以來就得到廣泛認可的主要優點之一。
           事實上,霍爾電流傳感器包含了非線性的磁芯,就已經決定了霍爾電流傳感器在特定情況下,一定會發生磁飽和。
            1、開環式霍爾電流傳感器的磁飽和問題
           下圖為所有高導磁材料的典型磁化曲線示意圖:
          霍爾電流傳感器磁芯的磁化曲線
           圖中,Oa’為起始非線性段,a’a’’為線性段,a’’a為飽和區。眾所周知,為了獲取較好的測量結果,不論是開環式霍爾電流傳感器,還是電磁式互感器,都會將磁化曲線中線性度較好的一段作為工作區間。換言之,只要磁感應強度超出線性區域一定的范圍,就會發生磁飽和。與電磁式互感器相比,開環式霍爾電流傳感器磁飽和原因只有一個,就是原邊電流足夠大。不會因為電流頻率低導致磁飽和,這是霍爾電流傳感器的優點,也是開環式霍爾電流傳感器磁飽和特點。相比之下,電磁式互感器也有一個優點,就是二次負荷足夠小時,即便過載較多,也不會發生磁飽和。
            2、閉環式霍爾電流傳感器的磁飽和問題
           開環式霍爾電流傳感器磁飽和問題較簡單,相比之下,閉環式霍爾電流傳感器磁飽和問題似乎不可理解,因為閉環式霍爾電流傳感器正常工作時,磁芯中的磁通為零,零磁通下,自然不會飽和。然而,這只能將是在正常工作條件下!
           事實上,即便是電磁式電流互感器或開環式霍爾電流傳感器磁飽和問題都是發生在過載,頻率過低,負荷過大等非正常工作條件下,正常工作條件下,都不會發生磁飽和。從閉環式霍爾電流傳感器工作原理可知,零磁通是建立在副邊補償繞組產生的磁場可以抵消原邊導體產生的磁場的前提下。那么,當閉環式霍爾電流傳感器是不是任何情況下都可以維持這個零磁通呢?
           顯然不是!
           A、傳感器未供電的情況下,副邊補償繞組不產生電流,此時,閉環式霍爾電流傳感器相當于一個開環式霍爾電流傳感器,只要原邊電流夠大,就會發生磁飽和。
           B、正常供電,原邊電流過大。這是因為二次補償繞組可以產生的電流畢竟是有限度的,當原邊電流產生的磁場大于副邊補償繞組能夠產生的最大磁場時,磁平衡被打破,磁芯中有磁場通過,原邊電流繼續加大時,磁芯中磁場也隨著增大,原邊電流足夠大時,閉環式霍爾電流傳感器進入磁飽和狀態!

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