System for detecting the condition of a lamp and activating a pe

Details System for detecting the condition of a lamp and activating a pe System for detecting the condition of a lamp and activating a pe

1990-06-27

1991-12-24

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

Specific condition

340458, 340516, 307 108, G08B 2100

Patent

active

050756729

ABSTRACT:
A system is provided for detecting the condition of a lamp, activating a permanent memory two-state display of the lamp condition, and displaying said condition during the daylight when no power is connected to the lamp. The system includes an electrical circuit powered by electricity drawn from power lines connected to the lamp such that the circuit is energized only when the lamp is supposed to be lighted. A rectifier transforms the alternating current of the power lines into a direct current for the circuit. The current of the power lines connected to the lamp is detected and measured when the lamp is supposed to be lighted in order to determine the condition of the lamp, and provide an appropriate signal for controlling switches within the circuit. Two alternative current pathways, each including a capacitor and a switch responsive to input from the current sensor, are provided in the circuit. When the circuit is energized, current flows through one pathway if the lamp is in working order, and through another if the lamp is sensed as being defective. The capacitor in the portion of the circuit being energized at any given time is periodically discharged to activate an electromagnet capable of changing the state of the display. Discharge of the capacitor is controlled by a free-run pulse generator which provides input to a third switch provided in the circuit.

REFERENCES:
patent: 3688297 (1972-08-01), Barnum
patent: 4068216 (1978-01-01), Brouwer et al.
patent: 4401972 (1983-08-01), Lupoli
patent: 4668946 (1987-05-01), Volk et al.

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