MOS Controlled Thyristor (or MCT) is voltage controlled fully controllable thyristor. The MCT is similar in operation with GTO thyristor, but it has a voltage controlled insulated gate. It has two MOSFETs of opposite conductivity types in its equivalent circuit. One is responsible for turn-on and the another is responsible for turn-off. A thyristor with only one MOSFET in its equivalent circuit, which can only be turned on (like normal SCRs), is called a MOS Gated Thyristor.
Positive voltage on the gate terminal with respect to the cathode turns the thyristor to the on state.
Negative voltage on the gate terminal with respect to the anode, which is close to cathode voltage during the on state, turns the thyristor to the off state.
Famous quotes containing the word controlled:
“A theory of the middle class: that it is not to be determined by its financial situation but rather by its relation to government. That is, one could shade down from an actual ruling or governing class to a class hopelessly out of relation to government, thinking of gov’t as beyond its control, of itself as wholly controlled by gov’t. Somewhere in between and in gradations is the group that has the sense that gov’t exists for it, and shapes its consciousness accordingly.”
—Lionel Trilling (1905–1975)