Electric lamp and discharge devices: systems – Automatic substitution of the power supply – With load device or electrode substitution
Patent
1986-05-05
1987-10-13
Dixon, Harold
Electric lamp and discharge devices: systems
Automatic substitution of the power supply
With load device or electrode substitution
315 88, 315 90, H05B 3910
Patent
active
047001100
ABSTRACT:
A second lamp is connected to power terminals upon each alternate switching off of a first lamp so that, upon each alternate switching on of the first lamp, the second lamp is illuminated. A magnetic latching relay switches the second lamp into and out of the circuit. The relay is powered by the discharge of one of two capacitors. One capacitor powers a set circuit of the latching relay, and another capacitor powers a reset circuit. Only one of the capacitors is charged at any one time. While power is applied to the power terminals to illuminate the first light, one capacitor is held discharged while the other capacitor is charged in preparation for powering the latching relay. The discharge of the charged capacitor through the latching relay is controlled electronically by a triac having a control terminal which is brought to control voltage by a fourth capacitor after a third capacitor has been discharged over a predetermined short time.
REFERENCES:
patent: 2476517 (1949-07-01), Titus
patent: 3636404 (1972-01-01), Appelton
patent: 3693045 (1972-09-01), Price
patent: 3917969 (1975-11-01), Olsen
patent: 4075501 (1978-02-01), Kondo
patent: 4322632 (1982-03-01), Hart et al.
patent: 4480197 (1984-10-01), Hollaway
"Automatic Emergency Light" by Philip Watson, Electronics, Australia, Oct. 1978, pp. 52, 53.
McNair Rhett
Willcocks Martin E. G.
Dixon Harold
McNair Rhett
Wray James C.
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