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

Write a report on various types of diodes, a. write a report (at least  2 p...

a. write a report (at least  2 pages ) on various types of diodes( Show and explain  the theory, symbol, circuit, characteristics, data sheets and applications circuits using the d

Determine the current needed in the coil to produce a flux, Q. Consider the...

Q. Consider the magnetic circuit shown in Figure. Assume the relative permeability of the magnetic material to be 1000 and the cross-sectional area to be the same throughout. Deter

What do you mean by an assembler, What is an assembler? Assembler: An...

What is an assembler? Assembler: An assembler or macro-assembler usually forms a part of the operating system. This translates an assembly language program in machine languag

Control systems, why open loop system is stable and why degree of stability...

why open loop system is stable and why degree of stability varies in closed loop system

What does eu do?, Basically,8086 is separated into two part. 1. BIU. 2. EU ...

Basically,8086 is separated into two part. 1. BIU. 2. EU Execution Unit(EU)Fetch the instruction from Queue(memory(6 byte) in BIU.) and implement it.

Find the induced emf across the coil, Q. A coil is formed by connecting 15 ...

Q. A coil is formed by connecting 15 conducting loops, or turns, in series. Each loop has length l = 2.5 m and width w = 10 cm. The 15-turn coil is rotated at a constant speed of 3

List the addressing modes supported by 8051, List the addressing modes supp...

List the addressing modes supported by 8051. 1. Register addressing  2. Direct  addressing 3. Register indirect addressing 4. Immediate addressing 5.Register addres

Counters, i need a counter of following o/p truth table 00000000 10000000 1...

i need a counter of following o/p truth table 00000000 10000000 11000000 11100000 11110000 11111000 11111100 11111110 11111111 00000000 10000000 . . . so please suggest me some IC

Realize various dividers in the schematic representation, Q. Counters are u...

Q. Counters are used to realize various dividers in the schematic representation of the digital clock shown in Figure. The blocks labeled "logic array" are logic gate combinations

Net force on the wire due to the interaction of the b-field, Q. (a) Show by...

Q. (a) Show by applying Ampere's circuital law that themagnetic field associated with a long straight, current-carrying wire is given by B φ = µ 0 I/(2πr), where the subscript φ d

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