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. What do you mean by Companding? In order to lower the crest factor of a waveform, so as to produce better performance, a process known as companding is used. It works like a

Q. What is Traffic Engineering? Traffic engineering provides the foundation for analysis and design of telecommunication network to carry a given traffic at a particular loss p

What is DMX? It is a communications protocol between step motors, actuators and an electronic circuit. A kind of language among elements there different manufacturers can use c

conversion of auto transformer in to winding transformer and vice versa

RESETIN  Input It is an  active  low signal when  it goes low program counter is  reset to zero and busses are tri stated  it also reset interrupt enable flip flop  and instruc

a problem solving problem

ie rule for guard wire

Q. How does the value of Idss and Vp change with the change in Vgs The value of Vp and and Idss can be controlled by adjusting the value of the gate to sorce voltage ie Vgs. T

Define voltage divider rule Voltage drop at every resistor that connected by serial can be search by using voltage divider rules (VDR).

Q. What do you mean by Dial Pulses? Dial Pulses: Dial pulsing (many times known as rotary dial pulsing) is the method originally used to transfer digits from a telephone set