Light fired thyristor with faulty firing protection

Details Light fired thyristor with faulty firing protection Light fired thyristor with faulty firing protection

1976-11-03

1978-10-24

Clawson, Jr., Joseph E.

357 30, 357 55, 357 86, H01L 2974

Patent

active

041224809

ABSTRACT:
A light fired thyristor including a semiconductor body having four zones of alternatingly opposite conductivity types constituting a first or cathode emitter zone, a control base zone adjacent thereto, a main base zone and a second or anode emitter zone with the cathode emitter zone being formed within the control base zone at one major surface of the semiconductor body and being divided into a plurality of separate regions of which one serves as the firing region of the first emitter zone to fire the thyristor in response to impinging radiation energy. The firing region of the first emitter zone is provided in part with a first ohmic contact which is ohmically connected to a further ohmic contact connected to the control base region adjacent the edge of the semiconductor body. The remaining regions of the first emitter zone are provided with a cathode contact which simultaneously contacts the portions of the control base zone between these regions and forms short circuits with the control base zone. Consequently with interfering currents which are approximately uniformly distributed over the thyristor area, an increase in potential is produced in the firing region of the first emitter zone which increase is in the same direction as the increase in potential in the firing region of the control base zone and the likelihood of a faulty firing of the thyristor is reduced.

REFERENCES:
patent: 3622845 (1971-11-01), McIntyre et al.
patent: 3697833 (1972-10-01), Nakata
patent: 3719863 (1973-03-01), Ogawa et al.
patent: 3794890 (1974-02-01), Weimann
patent: 3818370 (1974-06-01), Abe et al.
patent: 3893153 (1975-07-01), Page et al.
patent: 4012761 (1977-03-01), Ferro et al.

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