The investigation on the starting process inside a small wattage metal halide lamps and its influence on extra high frequency ballast circuit design

摘要

It is known that the instability caused by acoustic resonance inside a HID lamp will be eliminated at extra high operating frequency. There are two possible circuit topologies for extra high frequency electronic ballast: one is called as LCC circuit and one is called as LCL circuit as shown in Fig. 1 (a) and (b). It is found that the starting process in a MH lamp at extra high operating frequency may affect the reliability of the electronic ballast and damage inverter switches [1], This paper presents an experimental study on the starting process of a small wattage MH lamp and discusses the influence of the starting process upon the performance of different electronic ballast circuit.