V-i characteristics - power semiconductor devices , Electrical Engineering

Assignment Help:

V-I Characteristics

 In the  normal  mode of  operation of an IGBT  a positive  voltage is applied to the collector relative to emitter. When  the gate is at zero potential with  respect to E no  collector current IC flows  for collector voltage VCE below the  breakdown level  VB. When VC < VB  and the gate voltage exceeds the threshold  value VGT, electrons  pass into the N- region ( base  of the P-N-p transistor).

1742_V-I Characteristics.PNG

                                                                        Figure V- I characteristics of IGBT

These electrons  lower the  potential of the N region  biasing the P+ - N_  junction thereby causing holes to be injected from  the P+  substrate into the N_ epi-layer region. The excess electrons and holes modulate the conductivity  N+ region which dramatically reduces the  on resistance of the device. With  zero gate  bins the forward characteristic  of  IGBT  shows  very low current (<1bA)  where it breaks up sharply to much larger current levels with only a slight  increase in voltage. The Vcharacteristics of IGBT  is shown  in figure  it show the relation  between  collector current  tc and collector to emitter voltage VCE  for different values of gate to  emitter  voltage VGE.

The junction J1 blocks reverse voltage. An IGBT  without  N+ buffer layer  has higher  reverse blocking  capability. Therefore  an IGBT  required  for blocking  high  reverse voltage  does not  have N+  buffer layer. The  reverse blocking voltage  is shown  as the VRM on the VI  characteristics. The junction J2 blocks the forward  voltage when the IGBT is off.

 

 


Related Discussions:- V-i characteristics - power semiconductor devices

Matlab code, Linear Equalizer and Decision Feedback Equalizer ...

Linear Equalizer and Decision Feedback Equalizer Simulation and Performance Comparison In this project , performance of decision feedback equalizer is analyzed,

What will the slipring voltage be in this case, A four-pole, three-phase, w...

A four-pole, three-phase, wound-rotor induction machine is to be used as a variable-frequency supply. The frequency of the supply connected to the stator is 60 Hz. (a) Let the r

Illustrate flat plate collectors, What is the use of basic earth-sun angles...

What is the use of basic earth-sun angles? Show by mean of diagram. Illustrate sun as source of energy with relevant data? Illustrate flat plate collectors. Describe liquid f

Port address - address bus , Port Address The port  address  is of 8 bi...

Port Address The port  address  is of 8 bit  it is range from 00H  to FFH. It means  there may be total  i 256 input  ports and 256  output  port which can be accessed by 8085

Dc generator, short note on armature reaction

short note on armature reaction

Complete instruction set of 8085 microprocessor , Complete Instruction Set ...

Complete Instruction Set of 8085 Microprocessor There are  total 256 instructions in  8085 microprocessor. These instructions are classified  into  seven categories  according

Ht metering, HT Metering The following type of meters is generally use...

HT Metering The following type of meters is generally used for HT consumers: Trivector Meter, Bivector Meter, and Summation Meters. Trivector Meter

Amplifier and active filter design, Amplifier and Active Filter Design Usin...

Amplifier and Active Filter Design Using Operational Amplifier 1) The purpose of this assignment is to train you to do some simple circuit design using op-amp. The circuit tha

Super-heterodyne receiver, Write a short explanation of the principles of s...

Write a short explanation of the principles of super-heterodyne receiver. It may help to use sample block diagram to state the process. Why is the production of the intermediate fr

Explain about half duplex transmission, Q. Explain about Half Duplex Transm...

Q. Explain about Half Duplex Transmission? Half Duplex Transmission A half-duplex channel can receive andsend, though not at the same instance. It's like a one-lane bridge w

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