Modeling of neon tube powered by high frequency converters

This paper presents a dynamic model for neon tubes. The model is derived from conventional Cassie´s and Mayr´s equations which are often used to model low-voltage and high-current arc discharges, such as electrical arcs in switching interrupters and HID lamps. In this paper, the effects of various types of energy dissipation mechanisms on conductance of the plasma channel are considered for high-voltage and low-current neon tubes. In particular, the Cassie´s and Mayr´s equations are modified such that the loss on the heat conduction of the neon tube can be accurate modeled. Some basic rules for the selection of parameters in the model are proposed. Simulation is performed using Pspice simulator. A high frequency switch mode supply is built to power the neon tube under test. Experimental results reveal that the developed neon tube dynamic model is applicable for both low and high frequency operations.