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

Find the power amplification, The constants of an amplifier are given by A ...

The constants of an amplifier are given by A = 1, R i =10,000, and R o = 100. It is driven by a Thévenin source with v Th (t) = V O cos ωt and R Th = 20,000 . The amplifier o

Nis sound systems, NIS Sound Systems, Inc. produces and sells sound systems...

NIS Sound Systems, Inc. produces and sells sound systems for both home and auto. DVD players used in the assembly of NIS systems are purchased from BUN Electronics. NIS purchasing

Critical field circuit resistance and critical speed, Q.   Define and expla...

Q.   Define and explain the critical field circuit resistance and critical speed of a DC shunt generator.   Ans. The OCC and R - line for a DC shunt generator. As, R f is

Cipper, when i/p voltg is grater than battery diode is clse or open

when i/p voltg is grater than battery diode is clse or open

Magnetic field due to a current carrying coil, Amperes Circuital Law states...

Amperes Circuital Law states that the line integral of the magnetic field H around a closed  path equals  the  total  current enclosed. ∫ H       dl          ∑ I   App

Working of spectrum analyzer and its applications, Q.  Explain the working...

Q.  Explain the working of spectrum analyzer and its applications. OR Draw block diagram of spectrum analyzer and explain its operation write down its importance applica

Induction heating levitation, Using a levitation coil, you levitate a condu...

Using a levitation coil, you levitate a conductive object in the magnetic field and heat within that field. I have 2 sample report and I would like you to write some thing similar

Dc motor characteristics, Q. DC Motor Characteristics? We gain an under...

Q. DC Motor Characteristics? We gain an understanding of the speed-torque characteristics of a dc motor from Equations. In shunt motors, the field current can be simply control

Stakeholders - legal requirements for distribution licensees, Stakeholders ...

Stakeholders - Legal Requirements for Distribution licensees There have to be consultations among several stakeholders such as the licensees, the governments, consumers, gener

Circuit theory, i want circuit theory relavant assingment sir please immed...

i want circuit theory relavant assingment sir please immediately

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