Audible alert for automatic shutoff circuit

Details Audible alert for automatic shutoff circuit Audible alert for automatic shutoff circuit

1991-09-26

1997-06-24

Hofsass, Jeffery

Communications: electrical

Continuously variable indicating

With meter reading

34082537, 340529, 34030915, 307141, G08C 1900

Patent

active

056421044

ABSTRACT:
An automatic lighting controller applies a turn-off control signal to a gate controlled power switch for switching OFF lighting when a timer circuit determines that motion activity above a threshold level has not occurred within the controlled area during a prescribed interval. A counter produces a grace period count signal and a reset count signal, with the grace period count signal occurring within a predetermined sub-interval, for example, one count cycle prior to the reset count signal. The grace period count cycle (N-1) interval is adjustable, for example, from about 0.6 second (for test purposes) to about 14 seconds. The grace period count signal enables an audio transducer which provides an audible alert that the lights are about to be switched OFF automatically. A person in the controlled area can override the impending automatic shutoff simply by initiating some motion activity during the grace period.

REFERENCES:
patent: 3842403 (1974-10-01), Konopka
patent: 4090107 (1978-05-01), Seib
patent: 4223301 (1980-09-01), Grimes et al.
patent: 4367455 (1983-01-01), Fried
patent: 4426639 (1984-01-01), Jessup
patent: 4538973 (1985-09-01), Angott et al.
patent: 4563592 (1986-01-01), Yuhasz et al.
patent: 4636774 (1987-01-01), Galvin et al.
patent: 4716301 (1987-12-01), Willmott et al.
patent: 4751399 (1988-06-01), Koehring et al.
patent: 4823021 (1989-04-01), Shimada et al.
patent: 4864482 (1989-09-01), Quazi et al.
patent: 5153580 (1992-10-01), Pollack

Affiliated with

Also associated with

Rating

Audible alert for automatic shutoff circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Audible alert for automatic shutoff circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Audible alert for automatic shutoff circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-151456