Abstract
Recently, miniature HID lamps have been developed and used for the indoor illumination in offices and stores.
The ballast for the lamps is required to be smaller size, lighter weight and moreover excellent functions such as dimming, free from the source voltage variation and good controllability. If a dynamic simulation model of the HID lamps is given, it is very useful for the development and design of the such ballasts.
In this paper, a simulation model of metal halide lamps is proposed with the state variable equation method based on the electric conductivity of plasma in the bulb. The equations are consist of the state variables such as mercury and halide additive quantity, conductivity of plasma, voltage and current of operating circuit and temperature of the lamp, etc. The calculated results of an 100 W metal halide lamp show comparatively good agreement with the experimental results at the lamp starting and the source voltage variation.
