With neat diagram, explain the operation of MCT and state two applications of MCT.

With neat diagram, explain the operation of MCT and state two applications of MCT.
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1 Answer

Answer :

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Working: MCT turn ON: If the gate of the MCT is negative with respect to anode a p-channel is created in p-FET and p-channel ON FET causes the forward biasing of n-p-n transistor.(base drive to n-pn transistor), the n-p-n transistor applies base drive to p-n-p transistor and regenerative action starts and the device is latched(turns ON). MCT turn OFF : If the gate of MCT is positive with respect to anode, turn off the ON FET and N-channel is created in n-FET and nchannel FET turns ON which short circuit the base emitter junction of p-n-p transistor, this diverts the base drive of the transistor through OFF FET and breaks the regenerative process and the device will turn off. 

Applications of MCT:

1. MCT’s are used in the circuit breakers

2. It is used in high power applications like high power conversions

3. MOS Control thyristor are used in induction heating.

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