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          閉環電流傳感器在車用電源系統中的應用
             地面車用電源系統(以下簡稱電源系統)輸出電流的檢測與控制,直接關系著電源系統工作的穩定性和可靠性,并影響車輛的運行狀況及車輛的可操作性。由于車輛復雜的使用條件導致車用電源的負載變化較大,隨之電源額輸出功率也將發生較大變化,若對電源的輸出電流不加限制,會造成電源因過載而發熱。影響其功率輸出,嚴重情況下會導致電源永久失效。
             閉環霍爾電流傳感器(以下簡稱傳感器)在車用電源系統中的應用,實現了對電源系統輸出電流的隔離測量,并通過反饋控制電源系統的輸出功率,保護了電源系統不會因電負載的變化而損壞。
             1.閉環霍爾傳感器的工作原理
             自1879年美國物理學家Edwin Herbert Hall發現霍爾效應以來,霍爾技術被越來越多的應用于工業控制的各個領域。隨著元器件工藝技術的發展,由霍爾器件應用開發的霍爾電流、電壓傳感器的性能也有了很大提高,特別是閉環霍爾電流、電壓傳感器的研制成功,大大地擴展了該項技術的應用領域。
             2.1霍爾效應及霍爾器件
             霍爾效應是霍爾技術應用的理論基礎,當通有小電流的半導體薄片置于磁場中時(如圖1),半導體內的載流子受洛倫茲力的作用發生偏轉,使半導體兩側產生電勢差,該電勢差即為霍爾電壓VH,VH與磁感應強度B及控制電流IC成正比,經過理論推算有式(1)關系: VH=(RH/d)×B×IC (1)
             式中:B為磁感應強度,IC為控制電流,RH為霍爾系數,d為半導體厚度。
             式(1)中,若保持控制電流IC不變,在一定條件下,可通過測量霍爾電呀推算出磁感應強度的大小,由此建立了磁場與電壓信號的聯系。根據這一關系式,人們研制出了用于測量磁場的半導體器件,即霍爾器件。
          圖1 霍爾效應原理
             2.2閉環霍爾電流傳感器的工作原理
             閉環霍爾電流傳感器是利用霍爾器件為核心敏感元件用于隔離檢測電流的模塊化產品,它的工作原理是霍爾磁平衡式(或稱霍爾磁補償式、霍爾零磁通式)。眾所周知,當電流流過一根導線時,將在導線周圍產生磁場,磁場的大小與流過導線的電流大小成正比,這一磁場可以通過軟磁材料來聚集,然后用霍爾器件進行檢測,由于磁場的變化與霍爾器件的輸出電壓信號有良好的的線性關系,因此,可利用霍爾器件測得的輸出信號,直接反映出導線中的電流大小,即

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