Optocoupler extends high-side current sensor to 1 kV


Posted on May 23, 2012

The task of sensing dc current at high voltage is often problematic. Most high-side current-sensing ICs available off the shelf are good only to 30 or 40V. Combining an optocoupler with such an IC yields a sensing circuit in which the only limitation of the high-side voltage is the optocoupler`s standoff voltage (Figure 1).






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