Overcurrent sensing circuit and self adjusting blanking

Details Overcurrent sensing circuit and self adjusting blanking Overcurrent sensing circuit and self adjusting blanking

1998-10-30

2000-08-22

Ballato, Josie

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 937, 361 912, 330298, H02H 314, H02H 320

Patent

active

061081825

ABSTRACT:
A sensing circuit 100 includes two resistors 11 and 12, two pnp transistors 13 and 14, and a current mirror 15 and 16. Resistors 11 and 12 convert the high voltages present in the bridge into a proportional current. The current mirror, mosfets 15 and 16, compares I.sub.1 and I.sub.2. If I.sub.2 is greater than I.sub.1 the voltage at point A is high. Otherwise this voltage is low. Resistor 12 is chosen smaller than 11 so that under normal operation, when FET 22 turns on, I.sub.2 is greater than I.sub.1 and the voltage at point A is high. During an overcurrent event, the drop across the FET 22, Von, is so great that I.sub.2 is less than I.sub.1 and the voltage a point A stays low.

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