Procedure and device for detecting the non-conducting state of t

Details Procedure and device for detecting the non-conducting state of t Procedure and device for detecting the non-conducting state of t

1985-09-12

1987-07-21

Salce, Patrick R.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 56, H02H 7122

Patent

active

046822780

ABSTRACT:
This invention concerns a procedure to operate a turn-off thyristor which can be set to a current-conducting state or a current-blocking state as a function of a switch-on command or a switch-off command. To permit particularly reliable and optimal operation of the turn-off thyristor, the voltage between its gate terminal, G, and its cathode terminal, K, is detected and when it drops below a negative threshold current value U.sub.GKS, a status signal, Z, is generated which indicates the current-blocking state of the turn-off thyristor. A further embodiment detects the gate current of the turn-off thyristor and after the appearance of the switch-off command, the status signal is generated as the polarity changes in accordance with the time derivative of the gate current. An overload of the turn-off thyristor is best recognized by having simultaneous to the appearance of the switch-off command, a time function with a preset expiration time initiated, and having a malfunction notification signal, F, generated for protective ignition of the turn-off thyristor if the time function expires prior to the appearance of the status signal.

REFERENCES:
patent: 4084206 (1978-04-01), Leowald et al.
patent: 4231083 (1980-10-01), Matsuda et al.
patent: 4597038 (1986-06-01), Stacey
Bosterling et al., "Praxis Mit Dem GTO", Elektrotechnik Issue 24, 1982, pp. 16-21.
Bosterling et al., "Praxis Mit Dem GTO", Elektrotechnik Issue 4, 1983, pp. 14-17.

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