| Title |
A Design of Electronic Ballast for 70 W Metal Halide Lamps |
| Abstract |
In this paper, a low wattage high frequency operation electronic ballast for double ended 70W metal halide lamp has been investigated. As an input source of the proposed ballast, 220V, 60 Hz ac voltage is used and is converted high frequency ac voltage by power processing system. To prevent a physical destruction of the lamp from acoustic resonance phenomenon, the proposed ballast supplies alternating voltage of 22kHz frequency to a metal halide lamp. It shows some efficacious result that reduce the start up time of lamp and electric power consumption. By testing the proposed ballast, lamp voltage and lamp current are 155Vpeak, 0.64A, respectively. Lamp luminous flux is 5300lm with 82W input power and ballast efficiency is 64.63 lm/w. The average starting time and restriking time of lamp are 3.9 and 4.5 minutes, respectively. |