MOS Controlled Thyristor

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MOS Controlled Thyristor (or MCT) is voltage controlled fully controllable thyristor. The MCT is similar in operation with GTO thyristor, but it has voltage controlled insulated gate. It has two MOSFETs in its equivalent circuit. One is responsible for turn-on and the another is responsible for turn-off. Thyristor with only one MOSFET in its equivalent circuit, which can be only turned-on, (like usual SCRs) is called MOS Gated Thyristor.

Positive voltage on gate terminal with respect to cathode turns the thyristor into on state.

Negative voltage on gate terminal with respect to anode (which is close to cathode voltage in on state) turns the thyristor into off state.

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