Introduction to the GTO
Introduction to GTO:
Fig: Equivalent circuit of GTO & Symbolic diagram of GTO
- The GTO is a power switching device that can be turned on by a short pulse of gate current and turned off by a reverse gate pulse.
- This reverse gate current amplitude is dependent on the anode current to be turned off. Hence there is no need for an external commutation circuit to turn it off.
- Because turn-off is provided by bypassing carriers directly to the gate circuit, its turn-off time is short, thus giving it more capability for high frequency operation than thyristors.
- GTOs have the I2t withstand capability and hence can be protected by semiconductor fuses.
- For reliable operation of GTOs, the critical aspects are proper design of the gate turn-off circuit and the snubber circuit.