Critical rate of rise of current - thyristor , Electrical Engineering

Critical Rate of  Rise of Current

The maximum  rate of  increase of current  during  on state  which  the SCR  can tolerate is called  the critical rate of rise  of current  for  the device. This is specified at maximum  junction temperature. During  initial period  of turning on only  a small  area  near the  gate conducts the anode  current. If  the  current  increase too fast  localized overheating may take place. This  is called the  hole storage effect. Due to localized  heating the device may get permanently  damaged. To day devices are available which  can withstand rate o fries of current damaged. Up to 200- 250 a microsecond however in application  this rate  is hardly allowed to exceed beyond 5-10 a micro  second. Protection against  di/ dt  is provided  by series inductor.

 

Posted Date: 4/2/2013 8:05:02 AM | Location : United States







Related Discussions:- Critical rate of rise of current - thyristor , Assignment Help, Ask Question on Critical rate of rise of current - thyristor , Get Answer, Expert's Help, Critical rate of rise of current - thyristor Discussions

Write discussion on Critical rate of rise of current - thyristor
Your posts are moderated
Related Questions
Q. Describe about digital communication systems fl A digital signal can be deflned as having any one of a finite number of discrete amplitudes at any given time. The signal coul

The voltage across a 1 - μF capacitor is given. Which is the sinusoidal expression for the current? a) 30 sin200t b) 70cos (800t - 20°) At what frequency will the re

what ternary alloy, composition and binary substrate can be used for an LED at 1.55 µm optical fiber windo

What are the Advantages of digital cameras Advantages of digital cameras over manual cameras include: no processing costs (As there is no need to develop film or make prints),

What is the Meaning of Parallel In - Serial Out Shift Registers? A four-bit parallel in - serial out shift register is shown below D0, D1, D2 and D3 are parallel inputs

Ask questertion #Minimum 100 words accepted#

Based on Figure, using star-delta transformation, calculate the current flow and voltage drops at 6kΩ resistor.

how fet transistor works in self bias

Responses to Exponential Excitations Let us consider Aest as a typical exponential excitation in which A is a constant and s is a complex- frequency variablewith a dimension of

Q. Basic principles of electromechanical energy conversion? Energy available in many forms is often converted to and from electrical form because electric energy can be transmi