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SCR Thyristor

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SCR Thyristor

Silicon Controlled Rectifier (SCR) is a unidirectional semiconductor machine product of silicon. This machine is the stable state equal of thyratron and therefore it's also known as thyristor or thyroid transistor. Actually, SCR (Silicon Controlled Rectifier) is a commerce title given to the thyristor by Normal Electrical Firm. Mainly, SCR is a three-terminal, four-layer semiconductor machine consisting of alternate layers of p-type and n-type materials.


Therefore it has three pn junctions J1, J2, and J3. The determine beneath reveals an SCR with the layers p-n-p-n. The machine has terminals Anode(A), Cathode(Okay), and Gate(G). The Gate terminal(G) is connected to the player nearer to the Cathode(Okay) terminal.


It's seen that a single SCR is a mixture of 1 PNP transistor (Q1) and one NPN transistor (Q2). Right here, the emitter of Q1 acts because the anode terminal of the SCR whereas the emitter of Q2 is its cathode. Additional, the bottom of Q1 is related to the collector of Q2 and the collector of Q1 is related to the bottom of Q2. The gate terminal of the SCR is related to the bottom of Q2, too.


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