Protective device for at least one thyristor

Details Protective device for at least one thyristor Protective device for at least one thyristor

1974-09-26

1976-03-09

Envall, Jr., R. N.

317 11A, 317 27R, 321 11, 321 13, H02H 328, H02H 710

Patent

active

039434192

ABSTRACT:
This invention concerns a protective device for at least one thyristor. Separate measuring sensors are provided for determining the thyristor parameters of current and the magnitude and rising slope of the thyristor voltage. The measuring sensors are followed by a comparison stage which compares the parameters with definite, predetermined conditions, and transmits a trigger pulse for the thyristor. With the protective device according to the invention, the thyristor can be fired by means of its control electrode during the recovery time of the thyristor, if an overvoltage occurs.

REFERENCES:
patent: 2585796 (1952-02-01), Lamm
patent: 3424948 (1969-01-01), Ravas
patent: 3487261 (1969-12-01), Boksjo et al.
patent: 3558977 (1971-01-01), Beaudoin
patent: 3626271 (1971-12-01), Dewey
patent: 3662250 (1972-05-01), Piccone et al.
patent: 3808455 (1974-04-01), Leisi
patent: 3842337 (1974-10-01), Ekstrom et al.

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