Gate turnoff thyristor with a pilot scr

Details Gate turnoff thyristor with a pilot scr Gate turnoff thyristor with a pilot scr

H - Electricity

01

L

356/37

H01L 29/74 (2006.01) H01L 29/06 (2006.01)

Patent

CA 1044376

ABSTRACT OF THE DISCLOSURE A gate turnoff thyristor includes a primary semi- conductor controlled rectifier and a pilot semiconductor controlled rectifier. Conduction in the primary controlled rectifier is initiated by conduction in the pilot rectifier, which in turn is initiated by receipt of a preselected signal on a gate terminal. An auxiliary current drain contact is coupled to the gate region of the primary controlled rectifier. When a predetermined current is withdrawn from the gate region of the primary controlled rectifier through the auxiliary current drain contact the device turns off. The current drain apparatus can include, for example, a selective coupling system such as a diode coupled to the gate contact so that the gate contact can be employed to withdraw current from the primary controlled rectifier portion.

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