Spread time - power semiconductor devices , Electrical Engineering

Assignment Help:

Spread Time (ts)

During  spread time anode  voltage  falls from 10% Ia  to the  on state  voltage  drop  and anode  current  rises  from 90% Ia  to final  value  of anode  current i ,e Ia in this period whole  charges injected from   gate spreads over the entire section of  cathode and anode  current  reaches at steady state  condition.

There the total turn on time  ( ton ) can be written  as

Ton = td + Ir + ts

In these  intervals td tr and ts the rise time is high  a s compared to other. If  rise time it  is reduced beyond  a limit thyrisotr may get destroyed because rate of  rise  of anode  current  may be  large  as compared to the spread velocity of charges and this  may forms a  local  hot spot on the cathode surface of SCR. Turn on  time depends on gate  current. It can be  reduced by using  higher  value of gate  currents.

 


Related Discussions:- Spread time - power semiconductor devices

FET, shockely equation?

shockely equation?

Determine the force applied to the plunger by system, Q. For the electromag...

Q. For the electromagnet shown in Figure, the λ-i relationship for the normalworking range is given by i = aλ 2 + bλ(x -d) 2 ,where a and b are constants. Determine the force app

Switching, With neat diagrams explain the configuration of a step-by-step s...

With neat diagrams explain the configuration of a step-by-step switching system

Dc generator, short note on armature reaction

short note on armature reaction

Describe the function of material handling system, a) Diagram FMS layout co...

a) Diagram FMS layout configurations with labeling. b) what are the basic components of FMS?Discuss in briefly. c) Describe the function of material handling system.

What is global positioning satellite, What is Global Positioning Satellites...

What is Global Positioning Satellites (GPS) Global positioning satellite (GPS) systems are used to determine exact location of a car, ship, airplane or any conveyance that trav

Explain classification of amplifiers on biasing conditions, Q. Explain the ...

Q. Explain the classification of amplifiers on the biasing conditions? Based on the amount of transistor bias and amplitude of the input signal, amplifiers can be classified as

Explain sampling and pulse modulation, Q. Explain Sampling and Pulse Modula...

Q. Explain Sampling and Pulse Modulation? In most analog circuits, signals are processed in their entirety. However, in many modern electric systems, especially those that conv

Wire-line and fiber-optic channel, Q. Wire-line and Fiber-optic channel? ...

Q. Wire-line and Fiber-optic channel? Wire-line channels are used extensively by the telephone network for voice, data, and video transmission. Twisted-pair wire lines (with

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd