Difference between Latching and Holding Current

The main difference between latching and holding current of SCR is that latching current is related with turn on process while holding current is related with turn off process of SCR. Latching current of forward biased SCR is the minimum current which anode current must attain to continue to remain in forward conduction mode even … Read more Difference between Latching and Holding Current

V-I Characteristics of SCR Explained with Circuit Diagram

Definition of V-I Characteristics of SCR A V-I Characteristic of SCR (Silicon Controlled Rectifier) is the voltage current characteristics. The current through the SCR varies as the Anode to Cathode terminal voltage and Gate to Cathode terminal voltage is varied. The graphical representation of current through the SCR and voltage across the anode to cathode … Read more V-I Characteristics of SCR Explained with Circuit Diagram

Silicon Controlled Rectifier (SCR) – Definition and Construction

Definition Silicon Controlled Rectifier (SCR) is a solid state device used for power control in DC and AC system. An SCR is so called because silicon is used for its construction and its operation as a rectifier can be controlled. Silicon Controlled Rectifier is the oldest member of thyristor family. Thyristor is a family of … Read more Silicon Controlled Rectifier (SCR) – Definition and Construction

Difference between Snubber Circuit and Crowbar Circuit

As we know, both Snubber Circuit and Crowbar Circuit is used for protection against Overvoltage using Thyristor but they way they protect the Thyristor has some difference. Crowbar Circuit: Power supplies are normally reliable, but if they fail then they can cause significant damage to the circuitry they supply. To protect against this it is … Read more Difference between Snubber Circuit and Crowbar Circuit

Step Potential and Touch Potential – Must Read

Step potential is the voltage between the feet i.e. one step of a person standing near an energized grounded object. Touch potential is the touch voltage between the energized object and the feet of a person in contact with the object. It is equal to the difference in voltage between the object and a point … Read more Step Potential and Touch Potential – Must Read

What Happens When Reverse Biased Thyristor Gated?

SCR / Thyristor is a four layer three junction device. It mainly consists of interleaved layers of P and N layers. It can block Voltage of either polarity but conducts current only in one direction that is from Anode to Cathode under normal working of forward biasing. Basically to forward bias an SCR we need … Read more What Happens When Reverse Biased Thyristor Gated?

Avalanche Breakdown of Thyristor

First we will describe what avalanche breakdown is. Avalanche breakdown occurs at p-n junction which is moderately doped and has a thick junction means have depletion layer width high. Avalanche breakdown occurs when we apply high reverse voltage across the p-n junction. As we apply more and more reverse voltage across the junction, the electric … Read more Avalanche Breakdown of Thyristor