Power mosfet - power semiconductor devices , Electrical Engineering

Assignment Help:

Power MOSFET

MOSFET stands  for metal oxide semiconductor fields  effect transistor.  A power  MOSFET has  three  terminal  drain source  and  gate,. It  is unipolar device  means its operations  depends upon   the flow  of one  carriers  only. The power MOSFET is designed  to handle large amounts of power. Compared to the other power semiconductor  device s its  main advantages are high  commutation speed  and good efficiency at low voltages. Power MOSFET is a voltage controlled  device and it requires only small  input  current. It has extremely high input impedance  and is widely used in switching  devices. The  power MOSFET  is the most widely used low voltage  switch and  used in low power high frequency converters power suppliers DC to DC converters and low voltage motor controllers. MOSFET have a very thin silicon dioxide layer  is kept  very thin to ensure that the gate has  good control  over the  gate  current. This layer  could be  destroyed if a voltage  higher  than rated value is applied to the gate.

2055_Power MOSFET.PNG

                                                                         figure N - Channel V- MOSFET

Power MOSFET  are usually constructed in v shape as shown in  because  of its v shapes  sometimes it is called  the  v MOSFET  or V EFT. V shaped  cut penetrates from the  device  surface  almost  to the N  substrate through  N  P and N layers  as shown  in  the N  layers  are made  heavily doped low resistive material and the N layers is made  lightly doped  high resistance region.

1304_power MOSFET N channel P channel.PNG

                                                             Figure symbol of power MOSFET N channel P channel

The silicon dioxide dielectric  layer  covers both the  horizontal surface and v cut  surface. The  insulated gate is made by depositing a metal film on the silicon dioxide (Sio2) layer in the v cut. Source terminals are made by  making a contact to the upper N+ and P layers  through the layer. The  drain terminal is made  by N+ substrate of the device. The  power MOSFET is an enhancement  type MOSFET  and in this type of MOSFET  there is no channel exists  between drain  and source until the  gate is  positive with respect to the source. The  symbol of power MOSFET is shown  in this type of MOSFET  there is an enhancement type and source  until  the gate is positive  with respect to the source. The symbol of power  MOSFET.

 


Related Discussions:- Power mosfet - power semiconductor devices

Analog communication systems, Q. Analog communication systems? An analo...

Q. Analog communication systems? An analog message is a continuum of possible amplitudes at any given time, and analog signals are continuous in time and in amplitude, such as

Explain about blocking probabilityand grade of service, Q. Explain about bl...

Q. Explain about blocking probabilityand Grade of service? And what do you mean by delay systems in telecommunication networks? Ans: Grade of service: In loss systems, traff

Evaluate the form factor, Evaluate the form factor: For the saw tooth ...

Evaluate the form factor: For the saw tooth wave illustrated in Figure, find out the form factor. Figure: Saw Tooth Wave Solution Time period of given wave i

Determine efficiency on diffrent load cycle, Q. A 75-kVA transformer has an...

Q. A 75-kVA transformer has an iron loss of 1 kW and a full-load copper loss of 1 kW. If the transformer operates on the following load cycle, determine the all-day efficiency:

Transients in r-l-c circuits, Transients in R-L-C circuits: Scenario ...

Transients in R-L-C circuits: Scenario The Laplace transform is a valuable mathematical tool which allows the solution of difficult differential equations to be easily de

Congestion, It is uneconomic to provide adequate equipment to carry all the...

It is uneconomic to provide adequate equipment to carry all the traffic which could possibly be offered to a telecommunication system. In a telephone exchange it's theoretically po

Structure and use of pnp transistor, Structure and use of PNP transistor: ...

Structure and use of PNP transistor: The figure opposite is a schematic presentation of a PNP transistor related to two voltage sources. To construct the transistor conduct ap

P type material - semiconductor material, p type material: p type ma...

p type material: p type material is formed by doping aerial  crystal with impurity atoms having three valance electrons. The diffused impurities with three valence electrons

Design a circuit for indicate the connection of a battery, You are asked to...

You are asked to design a circuit that indicates if a 12 V battery has been connected the correct way around to two terminals, A and B. To do this, you have chosen to use a special

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