Title: Ignition apparatus for thyristors

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Abstract: An ignition apparatus for triggering a plurality of thyristors connected in series and/or in parallel is disclosed. The apparatus includes a high frequency power source, a switch for interrupting the output of the high frequency power source, a pulse generator, a gate transformer for supplying the output of the high frequency power source and the pulse current from the pulse generator to the gate of a thyristor, and a controlling device for controlling the switching time of the switch and the time of pulse-generation by the pulse generator. The switch and the pulse generator are controlled by the controlling device so as to feed a current pulse to the gate transformer from the pulse generator before the output of the high frequency power source is supplied to the gate transformer by actuating the switch. Thus, a gate current having a fast rise time, a desirably controlled time interval and a suitable amplitude is provided supplying a large output capacity for the ignition apparatus for simultaneously triggering the plurality of thyristors connected in series and/or in parallel. This apparatus eliminates the prior art requirement for employment of separate rectangular wave AC generators for each group of thyristors having the same ignition period.


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