Thyristor apparatus employing light-triggered thyristors

Details Thyristor apparatus employing light-triggered thyristors Thyristor apparatus employing light-triggered thyristors

1983-05-24

1985-08-20

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361100, 361 56, 361111, 363 54, 363 57, 363 58, H02H 710

Patent

active

045368163

ABSTRACT:
A thyristor apparatus employing light-triggered thyristors comprises forward voltage detecting circuits (15) and a thyristor number detecting circuit (17). The forward voltage detecting circuits (15) detect forward voltages applied to light-triggered thyristors (13) to provide detected signals. The thyristor number detecting circuit (17) is responsive to the detected signals to cause light-triggered thyristors in a thyristor arm (U) to be turned on simultaneously in the case where the number of the light-triggered thyristors being supplied with forward voltages is one or more but not more than a predetermined number. Accordingly, if and when an overvoltage is applied to the thyristor arm (U), overvoltage suppressing elements (14) are prevented from being damaged even if partial commutation failure occurs in the light-triggered thyristors.

REFERENCES:
patent: 3599075 (1971-08-01), Etter et al.
patent: 3865438 (1975-02-01), Boksjo et al.
patent: 3881147 (1975-04-01), Veda et al.
patent: 3962624 (1976-06-01), Ostlund et al.
patent: 4084206 (1978-04-01), Leowald et al.
patent: 4084221 (1978-04-01), Ogata
patent: 4313156 (1982-01-01), Kobayashi et al.
patent: 4371909 (1983-02-01), Kano
patent: 4414599 (1983-11-01), Kobayashi

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