Electric lamp and discharge devices: systems – Regulation of the control current and/or potential applied...
Patent
1976-01-07
1976-11-09
La Roche, Eugene
Electric lamp and discharge devices: systems
Regulation of the control current and/or potential applied...
307252F, 307252N, 315199, 315296, 315360, 323 19, 323 41, H05B 3902
Patent
active
039913430
ABSTRACT:
A control circuit for progressively and gradually varying the illumination intensity of incandescent lamps. The circuit comprises a source of alternating current connected in series with an electric lamp load which is also in series with a silicon controlled rectifier. This silicon control rectifier is rendered conductive when its gate is actuated by a gate signal generated by a programmable unijunction transistor (PUT). The conduction of the PUT depends on the voltage applied on its gate by a gate biasing circuit connected thereto and which comprises a charging capacitor. On the other hand, a charging circuit is connected across the silicon control rectifier whereas a second charging circuit is connected between the anode of the PUT and the first-mentioned charging circuit. Thus, progressive and gradual extinction or quenching as well as progressive and gradual ignition or lightening of the electric lamp are effected by making the charging or discharging time of the first-mentioned circuit higher than the charging or discharging time of the gate biasing circuit, whereby the time intervals between which the PUT is made conductive becomes longer and longer due to the reducing difference between the voltage supplied by the biasing circuit to the gate of the PUT and the voltage on the cathode of the PUT supplied by the second-mentioned charging circuit, at each source cycle.
REFERENCES:
patent: 3389328 (1968-06-01), Janson
patent: 3500174 (1970-03-01), Ellerbeck
patent: 3534224 (1970-10-01), Skirpan et al.
LandOfFree
Control circuit for progressively varying illumination intensity does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Control circuit for progressively varying illumination intensity, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control circuit for progressively varying illumination intensity will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1727482