Thermal Behaviors of Thyristors in Repetitive Pulsed Power Applications

The temperature is closely related to the operating state of the thyristors in repetitive pulsed power applications. To study the thermal behaviors of the thyristor at high blocking voltage and repetition discharge frequency, the thermal calculation model, including the electrothermal model and the finite-element method (FEM) model, is established. The model is based on the practical conditions, the internal structure of the thyristor, and the heat transfer mechanism and is validated by comparing the experimental and calculation results. By the model, the transient junction temperature variation and the mathematical model among blocking voltage, repetition frequency, and junction temperature are obtained. The model presented is capable of evaluating the thermal behaviors, calculating the junction temperature of the thyristors in repetitive pulsed power applications, and providing optimal suggestions for the reliable operation of the pulsed power sources.