BALLAST FOR HIGH PRESSURE SODIUM LAMPS HAVING CONSTANT LINE AND LAMP WATTAGE

摘要

High efficiency electronic ballast is described for high pressure sodium lamps (HPS). This ballast is powered by an AC line current which is rectified so that the lamp is lit by a direct current of 160 volts. The ballast maintains a constant wattage in the lamp and a constant power sector. An ignition circuit develops a high voltage pulse of short duration to start the lamp.