Societe Generale De Constructions Electriques Et Mecaniques (alsthom)

Serge Lehmann

Serge Andre

The present invention concerns a reverse conduction thyristor. The diode egrated with the thyristor comprises a P + anode, an N layer having slight doping, an N + cathode intended for facilitating the electrical contact and, between the P + cathode and the slightly doped N layer, a thin extra layer of the P type whose presence increases the critical speed of increase of the direct voltage applied to the thyristor in its blocked state.

Reverse conduction thyristor

Power thyristor having rapid triggering, comprising a triggering emitter. the cathode face, the separation line between an intermediate zone of the base and the main emitter, a line from which the firing of the thyristor is effected, has a symmetrical corrugated shape allowing an interdigitation which is also symmetrical. Application to the increasing of the triggering speed of power thyristors without any noticeable reduction in the maximum value of the intensity.

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Sainte Genevieve des Bois, France

Serge Lehmann