The Analysis of a Thyristor Inverter Type of Step-up Circuit for the Discharge Lamp Operation

Abstract

In the previous paper, the authors treated “Discharge Lamp Operation by Means of a Thyristor Inverter Type of Step-up Voltage Circuit”. The advantages of the new lamp operating system are based on the step-up function, the current limit function and controllability of a thyristor inverter type of step-up circuit. These characteristics, however, are realized only when the specified conditions, that is, circuit constant and driving frequency, are satisfied. So, before the design for practical use of the system is begun a detailed analysis of the circuit is required.Though the analysis of a single phase thyristor inverter circuit itself has been already reported in many literatures, there is nothing directly available for the purpose to make clear a series of the operations of the thyristor inverter type of step-up circuit for the discharge lamp operation.Thus, the authors have analized the circuit in the frequency domain (400 Hz-) in which the lamp load can be assumed to be an equivalent constant resistance when the fluorescent lamp is used as the discharge lamp. The results have revealed quentitatively the whole mechanism of the lamp operating circuit and given the prospects of the practical circuit design method.