PROTECTIVE DEVICE OF FLUORESCENT LAMP INVERTER

摘要

PURPOSE:To judge the last stage of the life of a fluorescent lamp and avoid the breakdown of the fluorescent lamp and protect an electronic circuit at a low cost. CONSTITUTION:A protective detection winding 3c is added to an output leakage transformer 3. A voltage supplied form the protective detection winding 3c is rectified and detected by a diode 7a. A voltage applied to the base of an oscillation output transistor 2 is controlled by a reference Zener diode 7c and an output-down transistor 7e through a timer circuit 11.