雙電壓霍爾效應電流感測器

本論文利用半導體製程高度整合的特性，將雙電壓霍爾效應電流感測器的被動元件整合於IC內部，改善既有霍爾效應電流感測器在低電流感應輸出電壓較不明顯且線性較差的性能獲得提升。 IC內部包含電源穩壓電路提供IC內部工作電壓，帶差參考電路提供參考電壓於源極隨偶輸出放大器，該放大器用來供應固定的電流源於霍爾效應感測器，使其正常工作感應磁場變化後輸出電壓，該輸出電壓再經由推挽式輸出放大器將其差分放大後輸出，新版IC精簡被動元件數量約佔既有電路的77.3%。量測部分使用現行8.5A的霍爾效應電流感測器套用下線IC後進行量測，量測結果改善了既有電路正電流輸出電壓落後0.096V和負電流輸出電壓超前0.048V的電壓輸出，並將正負電流的輸出電壓誤差改善至0.01V，此結果可避免馬達或機具於延遲或提前作動時誤動作的發生，而低電流感應電壓輸出也在新版IC中獲得改善，其改善於0.5A以內的輸出電壓與線性均獲得明顯的提升。

關鍵字

電流感測器；霍爾效應感測器

並列摘要

The thesis is regarding to utilize the high-integration characteristics of semiconductor process to integrate discrete components of dual voltage supply Hall effect current sensor in an IC. This integration will overcome the shortcomings of non-linearity and low sensitivity when Hall effect current sensor is operated in low current. The IC also incorporates a voltage regultor to supply internal circuits and a bandgap circuit as a reference voltage of a source follower amplifier. This amplifier is adopted to provide a constant current to hall sensor hence Hall sensor can normally sense the change of magnetic field and output a relative voltage. This voltage will be differentiated and amplified by a push-pull amplifier. The new art of IC will reduce the quantity of passive components in PCB to a portion of 77.3%. The measurement equiment is a 8.5A Dual voltage supply Hall effect current sensor. The measured results show improvements compared to existed circuits. The improvement includes reducing amount of voltage lagging positive current and amount of voltage leading negative current; the former is 0.096V and the latter is 0.048V. This IC performs a good correction of lowering the output voltage error to 0.01V. This enhancement could avoid mal-function of motors or tools due to above mentioned lagging or leading. On the other hand, performance is increased when low output voltage is generated from low sensed current. Obvious promotion in output voltage linearity is seen when sensed current is within 0.5A.