Power mosfet - power semiconductor devices , Electrical Engineering

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.

 

Posted Date: 4/2/2013 3:59:15 AM | Location : United States







Related Discussions:- Power mosfet - power semiconductor devices , Assignment Help, Ask Question on Power mosfet - power semiconductor devices , Get Answer, Expert's Help, Power mosfet - power semiconductor devices Discussions

Write discussion on Power mosfet - power semiconductor devices
Your posts are moderated
Related Questions
i have an assignment due for submission within two days. It is all about transformer measurement manually and numerical results using Matlab.Is there anyone can do the job?

Devise a "green" design to improve the electrical plan of a room in your home. How might you reduce electricity use in your home. Initiate and plan 1. Select two rooms in y

The pre-processing unit is responsible for taking the conditioned output from the heart sensor and generating a binary count during time T1 of this waveform (datain). It will compr

A 100hp,460v,8pole,60hz,star connected 3phase IM runs at 891rpm under full load what is the speed of the rotor field relative to i)rotor structure ii)stator rotating field

How many machine cycles does 8085 have, mention them The 8085 have seven machine cycles. They are Opcode fetch Memory read Memory write I/O read I/O

An industrial plant consumes 500 kWat a lagging power factor of 0.6. (a) Find the required kVA rating of a synchronous capacitor to improve the power factor to 0.9. (b) If a

Q.   What are the different types and uses of delay line in CRO? OR Why is a delay line used in the vertical section of the oscilloscope? Sol. All electronic circui

Over 6,000 companies have established operations within Jebel Ali Free Zone, using it as a base to distribute their products to the GCC countries and beyond. These companies hav


Explain the two types of materials that are formed after doping. Depending on the impurity added, extrinsic semiconductors can be then subdivided in two types of class: N-ty