Load switching arrangement for gas discharge lamp circuit

Details Load switching arrangement for gas discharge lamp circuit Load switching arrangement for gas discharge lamp circuit

H - Electricity

05

B

315/44

H05B 41/38 (2006.01) H05B 41/392 (2006.01)

Patent

CA 1219034

ABSTRACT OF THE DISCLOSURE Individual banks of gas discharge lamps are provided with a common dimming control system. If a bank of lights is turned on while others are on and in a dimmed condition, the voltage applied to all lamps is increased over a relatively short period of time to full voltage to ensure the proper striking of the new bank of lamps but over a sufficiently long time period that users of the dimmed banks of lamps will not be noticeably affected by the change in lamp output. Full power is then maintained for a sufficiently long time to ensure proper lamp striking and stabilization and all banks are then very gradually returned to the original dimmed illumination condition which was set before the new lamp bank was energized. A long time delay and a short time delay are applied to respective inputs of a comparator to enable the initiation of the lamp striking sequence for the new lamp bank and pre- vents the initiation of the lamp striking sequence due to short time disturbances on the line.

449188

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