Abstract
Discharge lamp's electric characteristics, which are nonlinear and hysteretic, can be computed by using the equivalent conductance model. It is important to theoretically represent the lamp voltage and current waveforms under the various conditions. But electric characteristics under the saturated condition can't be computed correctly, because the lamp model equation which has been used is based on the un-saturated condition in which mercury inside the lamp has evaporated completely.
We paid attention to the fact that a lamp voltage shows the condition of the inside of the lamp under the saturated condition. In this paper, we use the ratio of the lamp voltage as parameter which shows the condition of the inside of the lamp. Then we expanded the lamp model equation using the ratio of the lamp voltage. Now, by using this new lamp model equation, electric characteristics of the saturated discharge lamp can be computed.
