Microprocessor watch-dog monitor for electronic trip units

Details Microprocessor watch-dog monitor for electronic trip units Microprocessor watch-dog monitor for electronic trip units

1992-06-19

1993-05-25

DeBoer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

371 66, 361 97, H03M 1300

Patent

active

052145603

ABSTRACT:
A microprocessor watch-dog monitor for electronic trip units includes an input transistor (Q1), a timing circuit (16), and a comparator circuit (18). The comparator circuit is formed of a first bipolar transistor (Q3) of the PNP-type conductivity and a second bipolar transistor (Q4) of the NPN-type conductivity.

REFERENCES:
patent: 5017846 (1991-05-01), Young et al.
patent: 5089928 (1992-02-01), Durivage, III et al.
patent: 5151854 (1992-09-01), Adams et al.
patent: 5166887 (1992-11-01), Farrington et al.

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