Method and device for driving a turn-off thyristor

Details Method and device for driving a turn-off thyristor Method and device for driving a turn-off thyristor

H - Electricity

03

K

H03K 17/72 (2006.01) H03K 17/04 (2006.01) H03K 17/723 (2006.01) H03K 17/732 (2006.01)

Patent

CA 2243618

A method for turning a GTO on and off and a corresponding driving circuit are specified. The turn-on current and the holding current are generated from voltage pulses which are converted into currents with the aid of an electric energy store. In terms of circuitry, it is particularly advantageous when the required voltage pulses are drawn from the same energy source, or the same energy store, as the pulse required to generate the turn-off current. The holding current is preferably generated by repeating voltage pulses. The repetition frequency of said voltage pulses can then be increased or reduced as required. The frequency is reduced, in particular, when the gate-cathode voltage becomes negative, and is increased again when the voltage is positive again.

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