Timing device capable of synchronizing initiation time

Details Timing device capable of synchronizing initiation time Timing device capable of synchronizing initiation time

1996-10-10

1998-10-20

Le, Que

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214LS, H01J 4014

Patent

active

058250190

ABSTRACT:
A timing device which is associated with a light level sensor and which is arranged to provide a time-out signal to a relay after a predetermined time has elapsed following detection of a low light condition and initial energization of the relay. The device provides for synchronization of an initiation time T.sub.1 and, hence, a time-out signal generating time T.sub.2 with respect to a periodically occurring event time T.sub.3 (for example, sunset time) in order that the desired time of generating the time-out signal might be re-established following interruption of power to the device. Should loss of power occur, the last entered event time T.sub.3 is employed to synchronize the initiation time T.sub.1 and, hence, the signal generating time T.sub.2, when detection of a predetermined light level next occurs following re-establishment of power to the device.

REFERENCES:
patent: 4198563 (1980-04-01), Elssner
patent: 4237377 (1980-12-01), Sansum
patent: 5180907 (1993-01-01), Udden et al.

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