Design Description

To measure the current in power system health monitoring systems, a shunt resistor is placed either at the high side or the low side of the load. However, placing it at the low side could disturb the load ground. Measuring current at the high side is more preferable in most applications. The following figure shows a high-side current sensing circuit with power supply equal to 100 V and load current varying from 1 A to 10 A. The output of this circuit ranges from 0.5 V to 5 V.