SCR Construction and working in tamil

What is SCR ?
SCR is a three terminal and three junction semiconductor device acts as true electronic switch.
It is a unidirectional device. It converts AC to DC and controls the amount of power fed to the load. It contains the features of a rectifier and transistor.
SCR is widely used device in the Thyristor family, so it is commonly called as Thyristor.

History:
The SCR was proposed by William Shockley in 1950 and championed by Moll and others at Bell Lab.
It was developed by Gordon Hall and his team engineers at General Electric Company in the year 1956.

Construction:
SCR consists of four semiconductor layers forming a PNPN structure.
Thereare three junctions namely J1, J2, J3.
SCR have three leads, they are anode (A), cathode (K) and gate (G). The end P-layer acts as anode, the end N-layer acts as cathode and the P-layer nearer to cathode acts as gate.

Thank You for watching