System for controlling the intensity of high power lights

Details System for controlling the intensity of high power lights System for controlling the intensity of high power lights

1988-05-05

1989-12-05

Safourek, Benedict V.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Periodic-type current and/or voltage regulator in the supply...

315293, 315DIG4, H05B 4116, H05B 4124

Patent

active

048855081

ABSTRACT:
An electronic control system employing logical control for controlling a gas vapor arc globe. Power from a power source such as an AC power line or DC or AC generator is connected by a control switch to a logical control circuit which initially activates the igniter for the globe. In the event that the igniter does not cause the globe to ignite a control signal is provided to turn the power off. The voltage for operating the globe is boosted by means of a boost voltage generator to a substantially higher voltage than that of the power source. The operating voltage for the globe is generated by means of a multivibrator which runs at a relatively low frequency and a pulse width modulator which runs at a high audio frequency. The square wave output of the multivibrator (typically 60 Hz) is modulated by the pulse output of the pulse width modulator (typically 20 KHz) to provide a square wave DC to the globe modulated by high frequency rectangular pulses having a width which determines the intensity of the globe. The width of the output pulses of the pulse width modulator can be changed as desired to adjust this intensity. The frequency of the pulse width modulator is high enough so that the light intensity of the globe will remain constant to the eye. Further, feedback control circuitry is employed so as to maintain such intensity constant with fluctuations in line voltage.

REFERENCES:
patent: 3681654 (1972-08-01), Quinn
patent: 3986022 (1976-10-01), Hyatt
patent: 4291254 (1981-09-01), Arlt et al.
patent: 4450384 (1984-05-01), Krokangger

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