| Abstract |
An electronic ballast to supply fluorescent lamps with DC current is proposed in this article. With this system, the troubles or flickering and high frequency emmision are solved. Also, the luminous efficiency is improved. The fluorescent lamp is switched-on by high voltage applied between its electrodes, instead of heating the filaments. When we supply the tube with DC current, its behaviour is like a zener diode. The voltage between the electrodes is constant, so we will control the current across the fluorescent lamp with a system of current-mode control where the parameters to control are iLMAX and Ioff. With that kind of control, we have additional pulse-by-pulse current limiting, so the power converter is protected against damage from overloads. |
