Fast warm-up ballast for arc discharge lamp

Details Fast warm-up ballast for arc discharge lamp Fast warm-up ballast for arc discharge lamp

1990-06-21

1991-09-24

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

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

315289, 315291, 315307, 315DIG7, H05B 4124

Patent

active

050516655

ABSTRACT:
A ballast for starting and operating a high intensity discharge (HID) lamp in a dc mode includes an oscillator coupled to first and second direct current input terminals. The oscillator includes a high frequency generator driving a pair of semiconductor switches. A first transformer having primary and secondary windings is coupled to the semiconductor switches. A rectifier and voltage multiplier circuit converts the voltage across the secondary winding of the first transformer to a dc voltage. A first energy storage circuit coupled to the rectifier and voltage multiplier circuit stores energy for generating a negative-going, high-voltage spike sufficient for initiating a glow condition in the lamp. A second energy storage circuit, which stores energy for application to the HID lamp during starting, insures proper glow-to-arc transition. The starting and operating circuit further includes a control circuit for regulating lamp power in response to control signals received from voltage and current monitoring circuits. A portion of the ballast is adapted to permit the lamp to reach full light output in a relatively short period of time by briefly operating the lamp at an elevated power level during starting.

REFERENCES:
patent: 4266165 (1981-05-01), Handler
patent: 4348615 (1982-09-01), Garrison et al.
patent: 4356433 (1982-10-01), Linden
patent: 4396872 (1983-08-01), Nutter
patent: 4415839 (1983-11-01), Lesea
patent: 4455510 (1984-06-01), Lesko
patent: 4686428 (1987-08-01), Kuhnel et al.
patent: 4749913 (1988-06-01), Stuermer et al.

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