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Hall Current Sensor Circuit

2014-11-20 21:08  
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The output of the Hall element is connected to the instrument amplifier  AD620.  Entry and exit as the amplifier's differential mode and common-mode input. The gain of the amplifier by adjusting the the 1O kn potential between 1,8 pin change. The output of the amplifier connected feedback loop, the feedback loop around on the set ring in the opposite direction of its winding direction can make the magnetic field generated by the current through it and set ring collection to the magnetic field. The end of the feedback loop put 75 of kQ, a fine resistance grounding, the voltage across the resistance by measuring the fine, to calculate the current in the feedback coil, and then projected the size of the measured current through the set ring center. Hall current sensor circuit (click to enlarge):
Hall Current Sensor Circuit