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

Show common emitter output characteristics, Q. A Silicon Transistor Whose C...

Q. A Silicon Transistor Whose Common Emitter Output Characteristics Are Shown  In Dig Is Used In The Circuit With V cc =22.5v, R c =5.6k, R e =1k, R 2 =10k, And R 1 =90

Design an appropriate system, From a source with P in = 2.4 mW, we want to...

From a source with P in = 2.4 mW, we want to get P out = 60 mW at a distance l = 20 km from the source. α for the transmission line is given to be 2.3 dB/km. The available amplif

Compute the number of electrons that pass a given point, Q A wire with n = ...

Q A wire with n = 10 30 electrons/m 3 has an area of cross section A = 1mm 2 and carries a current i = 50 mA. Compute the number of electrons that pass a given point in 1 s, and

Define the signals in time domain, Define the Signals in Time Domain? T...

Define the Signals in Time Domain? The time domain is the type of visualization that most people are familiar with. This method shows variations of a signal with time. The most

Explain basic working of ideal operational amplifier, Q. Explain basic work...

Q. Explain basic working of Ideal operational amplifier? The operational amplifier, known also as op amp, consists of several transistors, diodes, capacitors, and resistors. It

Explain computer-aided circuit analysis, Q. Explain Computer-aided circuit ...

Q. Explain Computer-aided circuit analysis? A word of caution is appropriate if this is the student's first experience with simulation. Just as the proliferation of calculators

Steps to develop microprocessor based computer system, Explain in brief ste...

Explain in brief steps to develop a Microprocessor based computer system. The design of a microcomputer system should begin with the CPU module. It modules establishes the fund

What do you know about input impedance, Q. What do you know about Input Imp...

Q. What do you know about Input Impedance? Input Impedance  : Amplifiers will be quoted as having a specific input impedance. The sort of load it will place on preceding equipm

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