Tricky but Easy Electrical Engineering!
Snubber Circuit is a circuit consisting of series combination of resistance and capacitance in parallel with SCR. This article describes the purpose, design and working principle of Snubber Circuit in detail. Purpose of Snubber Circuit The main purpose of Snubber Circuit is to prevent the unwanted triggering of SCR or thyristor due to high rate … Read more
Switching characteristics of SCR is the time variation of voltage across its anode and cathode terminals and the current through it during its turn on and turn off process. This means, there will be two types of characteristics: One during turn on process and other during turn off process of SCR. It is also known … Read more
di/dt protection is required to protect thyristor or SCR from the formation of local hot spot due to high value of rate of change of anode current i.e. di/dt near the gate to cathode junction during its turn on process. When a thyristor or SCR is forward biased and is turned on by gate pulse, … Read more
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
SCR Turn on methods are the techniques to bring an SCR in forward conduction mode from forward blocking mode. An SCR in forward conduction mode is characterized by low impedance, low voltage drop across anode & cathode and high anode current. The value of anode current is determined by the load. Thus it allows for … Read more
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
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
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
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
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