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

Field Service Enginer, Give three reasons why a chamfer shouldn''t an "unim...

Give three reasons why a chamfer shouldn''t an "unimportant" dimension

Hexadecimal to binary conversion , Hexadecimal  to Binary Conversion ...

Hexadecimal  to Binary Conversion Conversion from  hexadecimal  to binary  is the  reverse  of this  process. Express each  hexadecimal  digit  in four bit  binary  equivalent

What is a darlington pair, Q. What is a darlington pair?               ...

Q. What is a darlington pair?                             The Darlington circuit consists of two cascaded emitter followers with infinite emitter resistance in the first stage.

Explain open loop control systems, Explain Open Loop Control Systems In...

Explain Open Loop Control Systems In an open-loop control system, the controller independently computes exact voltage or current required by the actuator to do the job and send

The resistance of a 7 m length of the similar cable, The resistance of a 2 ...

The resistance of a 2 m length of cable is 2.5?. Verify (a) the resistance of a 7 m length of the similar cable and (b) the length of the same wire when the resistance is 6.2

Discuss some features of pentium series of microprocessors, Discuss some fe...

Discuss some features of Pentium series of microprocessors. The Pentium is a CISC microprocessor, 32-bit superscalar.  The term superscalar is utilized for the processor that

Video graphics array and colour graphics adapter, What are the differences ...

What are the differences between Colour Graphics Adapter and Video Graphics Array graphics adapters? The Colour Graphics Adapter (CGA), originally also termed as the Colour/G

Explain cascading of multiple pics 8259, Explain cascading of multiple PICS...

Explain cascading of multiple PICS 8259.  The 8259A adds 8 vectored priority encoded interrupts to the microprocessor. It can be expanded to 64 interrupt requests by using one

Cro, Diagram and explanation of cro

Diagram and explanation of cro

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