H - Electricity – 03 – K
Patent
H - Electricity
03
K
H03K 17/72 (2006.01) H03K 17/082 (2006.01) H03K 17/732 (2006.01)
Patent
CA 2071890
2071890 9205636 PCTABS00011 For responding to a shorted gate in a gate turnoff thyristor (71) the gate electrode of which is connected by means of a controllable switch (89) to a control voltage terminal having a negative potential with respect to the cathode potential of the thyristor, the controllable switch (89) being arranged to conduct negative gate current in response to a thyristor turnoff command, voltage comparing means (127) is coupled to the controllable switch for detecting when the switch is conducting negative gate current of relatively high magnitude, timing means (117) is active for a predetermined interval following the start of said thyristor turnoff command, and logic means (100) operative to cause the switch to stop conducting negative gate current if the voltage comparing means (127) detects high gate current at the end of such interval.
Bailey Ronald Barry
Brown Herbert Joseph
Company General Electric
Craig Wilson And Company
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