THE PRICIPLES OF SELECTION OF THE ELEMENTS OF PROTECTIVE R-C-VD CIRCUIT USING THE EXAMPLE OF A CONSTANT VOLTAGE PULSE CONVERTER


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Abstract

This article covers the principles of selection of protective R-C-VD chain elements using the example of a constant voltage pulse converter (CVPC).

The aim of this research is the reasonable choice of protective chain parameters necessary for keeping the switching over-voltage on a safe level.

The objectives of this work are to describe the processes of formation of switching over-voltages with the partition of switching processes for the periods of time, the revealing of the over-voltages values based on circuit parameters, and the formulation of recommendations on the selection of parameters of protective R-C-VD chains.

The object of this study is the damping (protective) R-C-VD circuit used in the boost constant voltage pulse converter.

The article explains the relevance and the field of application of the issue under consideration. The article presents the mechanism of formation of switching over-voltages in the spurious inductances in the switching circuits. The authors considered the connection diagram of protective R-C-VD circuit for limitation of the over-voltage and the work of a constant voltage pulse converter with R-C-VD circuit in the terms of forming switching over-voltages. For this reason, one circuit operation period was divided into time intervals, each of which describes the circuit operation.

The research was carried out taking into account certain assumptions applicable to the analysis of such circuits. The authors introduce the analytical relations that allow determining the value of switching over-voltage on the basis of the circuit parameters. The authors obtained the relations reflecting the energies transformation between the circuit elements in the process of protective circuit operation. The flow chart illustrating the circuit operation is presented. On the base of the above description of the circuit operation and obtained analytical relations, the criteria for selection of protective R-C-VD circuit elements have been formulated focusing on the features of their selection.

The application field of this research is the schemes with transistors operating in key modes, such as the schemes of constant voltage pulse converter.

About the authors

Maxim Vladimirovich Pozdnov

Togliatti State University, Togliatti

Author for correspondence.
Email: instan@mail.ru

candidate of technical sciences, Associate Professor, assistant professor of the Department of Industrial Electronics

Russian Federation

Aleksey Vadimovich Pryadilov

Togliatti State University, Togliatti

Email: limitov@yandex.ru

candidate of technical sciences, Associate Professor, assistant professor of the Department of Industrial Electronics

Russian Federation

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