Turn off protection circuit

Details Turn off protection circuit Turn off protection circuit

1987-05-21

1988-06-07

Weldon, Ulysses

Communications: electrical

Continuously variable indicating

With meter reading

364709, H04Q 100

Patent

active

047499915

ABSTRACT:
In system capable of self turn-off, a circuit arrangement for providing a controlled turn-off includes a detecting circuit for detecting actuation of a turn-off switch, thereby providing a turn-off authorization signal. A turn-off protection circuit is coupled to the detecting circuit and a controller is coupled to the turn-off protect circuit and the detecting circuit. The controller disables the turn-off protect circuit when the turn-off authorization is received and present. The controller generates a turn-off signal for powering the system down after the turn-off protect circuit has been disabled.

REFERENCES:
patent: 3541453 (1970-11-01), Vanderpoel et al.
patent: 3611156 (1971-10-01), Ward
patent: 3769593 (1973-10-01), Williams
patent: 3963906 (1976-06-01), Yamamura et al.
patent: 4066462 (1977-02-01), Podowski et al.
patent: 4279021 (1981-07-01), See et al.
patent: 4380832 (1983-04-01), Nagata et al.
patent: 4412218 (1983-10-01), Niitsu
patent: 4451743 (1984-05-01), Suzuki et al.
patent: 4488250 (1984-12-01), Lipsey et al.
patent: 4491905 (1985-01-01), Arakawa

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