This paper presents a numerical model of gate turn-off thyristors (GTO's). the new concept of a controlled- switch realized by a controlled-current source is first introduced. Using this basic model, an equivalent circuit of the GTO is Given. According to the characteristics of GTO given by manu- Facturers, the equations connected with all the parameters of the Equivalent circuit are deduced. All of the parameters of the Equivalent circuit are determined. A sample study is presented At the end of the paper. We have simulated this numerical model With the SICOS program and the results are in concordance With the experiment.
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