Abnormality detection alarm circuit for output circuit

Details Abnormality detection alarm circuit for output circuit Abnormality detection alarm circuit for output circuit

1988-01-12

1989-05-16

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361101, 361 89, 361 86, 361 87, 323278, H02H 3093, H02H 320

Patent

active

048314838

ABSTRACT:
To turn off an output transistor and generate an alarm whenever a load driven by the output transistor is shorted or opened, the abnormality detection alarm circuit comprises a short detection circuit; an open detection circuit; a delay circuit; an output transistor driving circuit; and an alarm circuit. The delay circuit generates a delayed abnormality signal after the short or open detection circuit has kept generating an abnormal signal beyond a predetermined time. Further, a latch circuit is incorporated, to automatically returning the output transistor driving circuit and the alarm circuit to the normal status immediately after the abnormality has been removed.

REFERENCES:
patent: 4225897 (1980-09-01), Kaplan
patent: 4441136 (1984-04-01), Hampshire
patent: 4503478 (1985-03-01), Seki et al.
patent: 4528608 (1985-07-01), Andersson et al.
patent: 4538198 (1985-08-01), Imanishi et al.
patent: 4564879 (1986-01-01), Beinstman

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