Transistor overcurrent protection circuit

Details Transistor overcurrent protection circuit Transistor overcurrent protection circuit

1992-06-09

1994-08-30

Voeltz, Emanuel T.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323316, 323908, 361 18, 361101, 330298, G05F 156, H02H 700

Patent

active

053431413

ABSTRACT:
A transistor overcurrent protection circuit using an error amplifier to make a voltage comparison between a threshold voltage and the collector voltage of a current sensing transistor. The current sensing transistor is arranged in a circuit such that the collector current of the current sensing transistor is a measure of the collector current of an output transistor. A driver transistor has its emitter connected to the base of the output transistor. A source of control current to the drive transistor is coupled to the output of the error amplifier. When the collector voltage of the current sense transistor falls below the threshold voltage, the error amplifier causes the control current to the drive transistor to be reduced so as to reduce the collector current of the output transistor.

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