Abstract
Recently, low wattage HID lamps are developed and used steadily for an indoor illumination such as offices or stores. The ballast for the lamps is required to be in smaller size and lighter weight, and moreover it is required to have excellent function with good controllability. If the simulation model of the HID lamps is given for the behavior in transient such as in starting period, it is very useful for analysis and design of the ballast. In the paper, a simulation model for high pressure mercury lamps is proposed by means of state variable method. The equations are taken account of the state of each portion such as pressure, temperature and mercury vapor density, etc. The coefficient values of the equations are investigated physically and determined referred to experiment. The calculated results are in good agreement with the experimental results. Then, it is verified that the simulation model is available for the high pressure mercury lamps.
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