Thyristor protected against breakover firing

Details Thyristor protected against breakover firing Thyristor protected against breakover firing

1988-12-16

1990-01-30

James, Andrew J.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307303, 307305, H01L 2974, H03K 326, H03K 335

Patent

active

048977063

ABSTRACT:
A thyristor protected against breakover firing is disclosed which has a region which, in comparison to the remaining semiconductor body, has a lower breakdown voltage. This region is provided with an auxiliary electrode and is separated from the remaining semiconductor body by a trench. Upon onset of the avalanche breakdown in the blocking direction, a voltage greater by 0.5 V, compared to the first emitter electrode, can build up at the auxiliary electrode without the thyristor firing. The auxiliary electrode is connected via a resistor with the first emitter electrode of the thyristor. In addition, between the auxiliary electrode and the control electrode a breakover element is interconnected which conducts at a given voltage drop across the resistor and initiates the firing process of the thyristor.

REFERENCES:
patent: 3896476 (1975-07-01), Kawakami
patent: 4012761 (1977-03-01), Ferro et al.
patent: 4087834 (1978-05-01), Temple
patent: 4314266 (1982-02-01), Temple

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