ELECTRONIC BALLAST FOR HIGH-INTENSITY DISCHARGE LAMP AND METHOD OF DRIVING HIGH-INTENSITY DISCHARGE LAMP

摘要

The present invention relates to an electronic ballast for a high-pressure discharge lamp and a method for driving a high-pressure discharge lamp, and more particularly, a power supply circuit unit for outputting a boosted DC voltage by inputting a commercial AC and a boosted DC voltage in response to a pair of switching driving signals. A half bridge inverter for switching and driving a high-voltage discharge lamp, and a pair of switching drive signals having a predetermined dead time and a 180 degree phase difference between the switching-on periods, step by step at a predetermined time interval within a predetermined band And a digital controller which generates the variable to be circulated and provides the half bridge inverter. When driving a high-voltage discharge lamp, in order to prevent the occurrence of high frequency audible noise and to stabilize the flame, the same frequency is repeated several times several dozen times, and the lighting is maintained by a modified white noise modulation technique that passes to the next frequency. Let's do it.