Patent
Automatic energy control lighting system with automatically variable dc source
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TLDR
In this paper, an automatically variable d.c. voltage source supplies a control signal to a dimmer circuit that controls the brightness of a high-intensity gas discharge lamp in response to a varying voltage at its output which is functionally related to the difference between a voltage from a stable reference voltage source and a voltage produced by a photocell circuit.Abstract:
An automatically variable d.c. voltage source supplies a control signal to a dimmer circuit that controls the brightness of a high intensity gas discharge lamp in response to a varying d.c. voltage. The automatically variable d.c. voltage source produces a varying d.c. voltage at its output which is functionally related to the difference between a voltage from a stable reference voltage source and a voltage produced by a photocell circuit which is responsive to the light level of an area illuminated by the lamp controlled by the dimmer circuit. The variable d.c. source includes circuitry for indicating relamping conditions.read more
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References
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Patent
Light-regulating power supply circuit for gaseous discharge lamp
TL;DR: In this article, a power supply circuit operative to supply sinusoidal highfrequency (28 kilohertz) electrical power which meets both the starting and running requirements of a gaseous discharge lamp, and further operative to regulate the light output of the lamp, all without mechanical switching means or saturable reactors.
Patent
High intensity lamp dimming circuit
Kenneth P. Holmes,Carl R Snyder +1 more
TL;DR: In this paper, a high-intensity lamp dimming circuit with a programmable unijunction transistor (PU transistor) is proposed. But the circuit is not suitable for single-phase and three-phase power systems.
Patent
Constant light intensity servo control unit
TL;DR: In this article, the authors present a servocontrol unit designed to regulate the output of a storage battery to ensure a particular light intensity of a lamp contained in a pressure-resistant housing.
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Gaslamp lead ballast circuit having feedback control
TL;DR: In this paper, a lead ballast circuit for operating gas discharge lamps is described, which employs a variable inductor, such as a linear inductor or a saturable reactor, in series with a capacitor as the means for limiting the lamp current.
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Automatic illumination control system responsive to total illumination
Raymond G Edgerly,Peter J Zanini +1 more
TL;DR: In this article, a system for sensing the total amount of illumination in an area from both uncontrolled and controlled sources and automatically adjusting the amount of artificial light supplied to maintain a substantially constant value of total illumination is presented.