GAIN CONTROLLED ELECTRONIC BALLAST SYSTEM

摘要

The invention relates to an automatic gain controlled electronic ballast system for fluorescent lighting tubes designed to reduce or eliminate flicker or fluctuating light output. In one embodiment the gain controlled electronic ballast system (10) includes a filter network (111) which is connected to the power source (112) for establishing a substantially constant voltage signal and suppressing harmonic frequencies generated by the electronic ballast system 100. An induction circuit (115) is coupled to the filter network (111) for generating a voltage across the gas discharge tube (140 and 140') responsive to the driving current. The induction circuit (115) includes an automatic gain control network (117) to maintain the driving current at a predetermined value and generates a switching signal. A switching circuit (113) is coupled to the induction circuit (115) for establishing the driving current at a substantially constant and predetermined frequency responsive to the switching signal.