Key Terminologies of SCR
- SCR (Silicon Controlled Rectifier): The complete name of the Device, addressing a four-layer, three-terminal semiconductor device that conducts current in one direction only.
- Anode (A): The Positively charged terminal of the SCR. It is the terminal where the current enters the device.
- Cathode (K): The negatively charged terminal of the SCR. It is the terminal where the current exit the device.
- Gate (G): The control terminal of the SCR. Applying a little current or voltage to the gate controls the conduction of the device.
- Forward blocking Mode: The mode wherein the SCR is in a non-conducting state, and a positive voltage is applied to the anode regarding the cathode. In this mode, the gate signal isn’t applied or is deficient to trigger conduction.
- Reverse Blocking Mode: The mode wherein the SCR is in a non-conducting state, and a negative voltage is applied to the cathode concerning the anode.
- Forward Conduction Mode: The mode wherein the SCR is in a directing state, permitting current stream from the anode to the cathode. This is set off by applying an adequate gate signal in the forward blocking mode.
- Latching Current (I-L): The base current expected to keep the SCR in the leading state after it has been set off. When the SCR is locked, it stays in the ON state regardless of whether the gate signal is taken out.
- Holding Current (I-H): The base current expected to keep up with the SCR in the ON state after it has been triggered. In the event that the current falls underneath the holding current, the SCR will switch off.
- Gate Triggering Current (I-GT): The base current expected at the gate to trigger the SCR into conduction.
- Gate Triggering Voltage (V-GT): The base voltage expected at the door to set off the SCR into conduction.
- Turn off Time (T-OFF): The time expected for the SCR to switch off after the gate signal is taken out.
- Critical Rate of Rise of Off-State Voltage (dv/dt): The most extreme rate at which the off-state voltage can change without triggering the SCR accidentally.
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