Driving circuit for short circuit-proof readout stages

Details Driving circuit for short circuit-proof readout stages Driving circuit for short circuit-proof readout stages

1982-12-20

1984-12-04

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 98, 361101, H02H 902

Patent

active

044868022

ABSTRACT:
Driver circuit for short-circuit-proof readout with a plurality of protection-wired inputs and outputs, including three comparators being connected to the inputs and being referred to a reference voltage, a first AND gate being switched into conduction if a positive voltage is present at the first comparator, a first switch being opened when the first AND gate is conducting and being connected to negative potential when closed, three current sources being connected to the outputs and to the first switch, a Darlington stage being connected to the outputs and to the current sources, an evaluation unit being connected to the outputs and to the current sources, an OR gate being influenced by the evaluation unit, a second switch being operated by the OR gate, an external capacitor input connected to the second switch for charging through a fourth current source and discharging through a current sink, three Schmitt triggers being different thresholds and being charged through the capacitor terminal, a second AND gate connected to the OR gate for controlling charging and discharging, and a second transistor stage connected to the outputs and to the Schmitt triggers.

REFERENCES:
patent: 4047233 (1977-09-01), Yorks et al.
patent: 4321648 (1982-03-01), Kaplan
patent: 4377835 (1983-03-01), Asplund et al.

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