November 2016
Intermediate to advanced
1008 pages
27h 59m
English
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10.6. Gate Commutated Thyristor (GCT) and Integrated Gate Commutated Thyristor (IGCT)
The gate commutated thyristor (GCT) is a new thyristor device, which is based on the GTO structure. When a GTO changes from conduction to blocking state (turn-off transition), it goes through an indeterminate state where it is neither a thyristor nor a transistor. This state is sometimes referred to as the GTO mode. This mode requires snubber circuits to reduce the rate at which voltage is reapplied to the circuit. The GCT is a device that does not have the GTO mode and, consequently, there is no need for snubber circuits. The idea behind the GCT is to commutate the entire cathode current to the gate at turn-off. By doing this a smooth transition from thyristor ...
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