Analysis of the electromagnetic processes in the step-down pulse width converter with accounting of the temperature mode

Abstract

The problem of overheating of semiconductor conversion devices used in railway transport, is quite relevant. Of particular significance is the problem of converting devices operating in the key non-static mode operating range. The operation of such devices is held in the permanent starting transient electromagnetic processes. Nature of the transitional process and the heating elements converters in this case depends not only on the current load, but also from the previous modes. For these devices the calculations necessary to analyze both static and transient electromagnetic processes and transient thermal processes, which can lead to accidental modes of semiconductor converters.

In this article, based on the analysis down PWM described calculations transient and steady modes of electromagnetic pulse converters based on the temperature mode of passive components. The analysis of the roots of the characteristic equation allows to predict the type of transition and quickly carry out the correction form characteristics, taking into account changes in temperature.

The results of this analysis allow the development of conversion devices to consider the possibility of emergency transient operating conditions due to the heat of passive components.