Current threshold detector circuit

Details Current threshold detector circuit Current threshold detector circuit

1990-11-01

1991-10-15

Mullins, James B.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307356, 307363, 323317, 330288, H03K 5153

Patent

active

050577093

ABSTRACT:
A dectector circuit responsive to a current suppled to an input thereof provides an output signal when the magnitude of the current exceeds a predetermined threshold level includes a multi-collector transistor having a first one of its collectors connected to the base thereof and an emitter coupled to the input. A diode formed by a diode-connected transistor is coupled to the first collector of the multi-collector transistor. A second transistor is provided having its collector coupled to the second collector of the multi-collector transistor, a base coupled to the first collector and an emitter which is coupled to a pair of series connected resistors. The second transistor is operated at a lower current density than the diode-connected transistor such that the former operates in a saturated condition until such time that the input current exceeds the threshold level to produce the output signal.

REFERENCES:
patent: 4525638 (1985-06-01), Gray

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