Lighting control interface apparatus

Details Lighting control interface apparatus Lighting control interface apparatus

H - Electricity

01

H

348/39

H01H 47/00 (2006.01) H01H 47/22 (2006.01)

Patent

CA 1131747

Case 2684 LIGHTING CONTROL INTERFACE APPARATUS ABSTRACT OF THE DISCLOSURE An interface apparatus, for remotely controlling a plurality of solenoid actuated switching relays having first and second energizing coils, is capable of providing momentary first and second electrical signals respectively in response to an interruption of an input signal to the apparatus and the initiation of the input signal. The interface apparatus includes a first comparator sensing a change in the input signal, a second comparator sensing a change in the output of the first comparator so as to maintain the second comparator output 180 degrees out of phase with the first comparator output, and first and second monostable multivibrators that each have a trigger input connected to the output of a corresponding comparator so as to generate a momentary electrical signal when the trigger input senses a negative excursion in a change of state at the output of the corresponding comparator. The present interface apparatus has a considerably simplified circuit arrangement which has brought about a considerable cost reduction in the apparatus in addition to an improvement in serviceability therefor.

336996

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