CHOICE OF THE PROTECTIVE DELIMITER OF VOLTAGE ON THE EXAMPLE OF THE PULSE VOLTAGE CONVERTER


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Abstract

Object of research is the protective limiter used in the raising pulse converter of constant voltage (PCCT). The purpose of work consists in justification of a choice of the limiters necessary for restriction of switching revoltage in power transistors at the safe level, at the set parameters of work of the scheme. In article relevance of application of pulse power supply circuits in modern technologies at various types of loading is considered. On the example of the pulse converter of constant voltage the equivalent circuit showing is shown that switching off of the transistor is followed by an overstrain. For restriction of an overstrain it is offered to use voltage limiter. For the purpose of a rational choice of the limiter it is offered to consider switching processes at switching off of the transistor. The analysis of processes of switching is carried out on the basis of the assumptions which are often used in the analysis of pulse processes of pulse converters of voltage. The temporary chart explaining work of the scheme is provided. The analysis of processes of switching is followed by a conclusion of the analytical ratios reflecting key parameters of switching: level of revoltage, switching time, the energy emitted in the limiter for one period and average power of losses in the limiter. The concept of a relative overstrain which is used for a choice of the limiter and the power transistor is entered. Examples of the elements released by the industry which can carry out functions of limiters are reviewed. The analysis of parameters of the limiters released by various producers is carried out. On the removed analytical ratios and proceeding from the analysis of the parameters provided by producers of limiters recommendations and an estimated technique at the choice of limiters for power supply circuits are provided. A scope of this work are schemes with the transistors working in the key modes, such as schemes IPPN.

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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