Common turn-off circuit for a thyristor power converter

Details Common turn-off circuit for a thyristor power converter Common turn-off circuit for a thyristor power converter

H - Electricity

02

M

H02M 7/155 (2006.01) H02M 1/00 (2006.01)

Patent

CA 2181094

A common turn-off circuit for a thyristor power converter is specified. The common turn-off circuit is particularly suitable for AC converters such as, for example, railway grid couplings. The turn-off thyristors are directly connected to the secondary transformer windings. Additionally provided is a special freewheeling path via which the energy stored, in particular, in the transformer inductors or other relevant inductors can be drawn away. What is advantageous is the fact that all of the thyristors of the power converter can be turned off reliably and without any special precautions, since the common turn- off circuit is automatically ready for turning off. Overvoltages are avoided, moreover, by the special freewheeling path.

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