High-Voltage Isolating Current Detection Circuit (ISO212 And OPA27)

Published:2011/8/3 9:39:00 Author:Robert | Keyword: High-Voltage, Isolating, Current, Detection | From:SeekIC

In the circuit which has hundreds of volts voltage, if you want to detect the current you must solve the voltage isolating problem. One kind of practical circuit that can meet the requirements above is shown in the picture. The circuit uses a isolating amplifier ISO212P. This element is dual-port isolating miniaturization IC. The motor shown in the picture is a DC motor with 500V power supply. It is added a little resistor in series with the motor's power supply loop circuit for current detection. The resistor's value's selection should satisfy that it could get the maximum voltage signal of 50mV at the maximum current. Because the signal got from the sampling resistor would be added into the isolating amplifier ISO212P's pin 3 by the the out-phase input method, the amplifier's in-phase input port (pin 1) would connect to the ground. It should be noted that the ISO212P's input ground (pin 2) and the motor's power supply's ground should be connected, which means they are not common in ground.



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