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

Use of cro for frequency measurement, Q. Explain the use of CRO for frequen...

Q. Explain the use of CRO for frequency measurement.   Measurement of frequency: The frequency of the periodic signals is easily measured with a CRO. The frequency of a si

PLC and Scada, I needed a PLC and SCADA assignment just the program and it ...

I needed a PLC and SCADA assignment just the program and it has to be done in simatic flexible and step 7 software!

Bode plot phase ad gain margin, Using Bode plot calculate (a) Phase margin ...

Using Bode plot calculate (a) Phase margin (b) Gain margin (c) Stability of closed loop system. The open transfer function of the system is t=30/(s+2)/(s+3)Using Bode plot calcula

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,

Cost of initial investment, Based upon the following inputs, propose the op...

Based upon the following inputs, propose the optimal course of action for this venture: Probability of success: 30%; probability of failure: 30%; base case probability: 40%

Cmp compare instruction , CMP Compare Instruction This instruction is ...

CMP Compare Instruction This instruction is used to compare the contents  of register  or memory  with accumulator the contents of the operand remain  unaffected. There are tw

Growth in communications, The growth in communications over the past 60 yea...

The growth in communications over the past 60 years has been phenomenal. The invention of the transistor in 1947 and the integrated circuit and laser in 1958 have paved the way to

Explain n-type and p-type semiconductors, Explain n-type and p-type semicon...

Explain n-type and p-type semiconductors. n - Type semiconductor: If small amount of pentavalent impurity (group V elements) is added to a pure semiconductor giving a large

RESISTACE, What is the value of a resistor marked as 47KK?

What is the value of a resistor marked as 47KK?

Fermi dirac level, Fermi Dirac level: Sol. The Fermi level is simply...

Fermi Dirac level: Sol. The Fermi level is simply a reference energy level. It is the energy level at which the probability of finding an electron n energy unit above it in

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