Construction of SCR
Silicon Controlled Rectifier (SCR) is basically a four layered, three junction and three terminal device. The four layer are PNPN, the three Junction are namely J1 , J2 and J3 and the three terminals are anode(A), cathode(K) and the gate (G) as shown in figure (a) and (b).
A SCR is built with the four layers that comprise of the P-type and the N-type semiconductor material. These are layered so that it will in general frame three intersections that are J1, J2, and J3. The three terminals that are appended to it are known as anode, cathode, and gate. The anode is the essential terminal through which the ongoing streams or enters the gadget. Where the cathode is the terminal through which the entered current leaves the device.
The ongoing entering terminal is of positive extremity and the terminal through which the current is leaving is of negative extremity. In the middle of between the progression of current among the terminals, there should be a terminal that can give the control. This can be given by the terminal door. This terminal is at times additionally alluded to as the terminal of control.
Allow us to consider a SCR is of P-N-P-N type. For this situation, as the anode is associated at the over that is to P-type and the cathode is associated toward the end that is for N-type. Where the terminal gate is likewise associated with the p-type however it will be the subsequent P-type in the succession. Thus the gate terminal is situated so that it is closer to the terminal cathode.
In this, the intersection J1 is in the middle of between the main P-type and the N-type. The second intersection J2 will in the middle of between the N-type and the subsequent P-type layers. The third intersection will in the middle of between the last P-type and the N-type layers. In view of the prerequisite or the need of the applications these layers of the Thyristor are doped. The silicon liked here for its development is of characteristic sort.
Silicon Controlled Rectifier Symbol
Silicon Controlled Rectifier
The SCR or thyristor is one type of semiconductor device and using in high-power switching applications is exceptionally planned. The working of this device should be possible in a switching mode only and acts as a switch. When the SCR is triggered by its gate terminal into the transmission, then it will supply the current constantly. While planning a SCR or Thyristor circuit, exceptional focus ought to be expected for enacting the circuit. This article examines various techniques for SCR setting off or SCR turn ON strategies or setting off of Thyristors. There are different setting off strategies are accessible in light of different substances which incorporate temperature, voltage, and so on.
Table of Content
- Silicon Controlled Rectifier
- Key Terminologies
- Construction
- Operation
- Modes of Operation
- Types
- Advantages of SCR