Electrical transmission or interconnection systems – With nonswitching means responsive to external nonelectrical... – Temperature responsive
Patent
1992-11-30
1993-11-16
Zazworsky, John
Electrical transmission or interconnection systems
With nonswitching means responsive to external nonelectrical...
Temperature responsive
361 93, 361 58, 363 54, 363 57, H03K 1772, H03K 1708
Patent
active
052626911
ABSTRACT:
For responding to a shorted gate in a gate turnoff thyristor the gate electrode of which is connected by means of a controllable switch to a control voltage terminal having a negative potential with respect to the cathode potential of the thyristor, the controllable switch being arranged to conduct negative gate current in response to a thyristor turnoff command, voltage comparing means is coupled to the controllable switch for detecting when the switch is conducting negative gate current of relatively high magnitude, timing means is active for a predetermined interval following the start of said thyristor turnoff command, and logic means is operative to cause the switch to stop conducting negative gate current if the voltage comparing means detects high gate current at the end of such interval.
REFERENCES:
patent: 4597038 (1986-06-01), Stacey
Bailey Ronald B.
Brown Herbert J.
General Electric Company
Payne R. Thomas
Zazworsky John
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