Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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).
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 VI characteristics 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.
Static Rotor Resistance Control Methods This method is used only for slip ring induction motor in SRIM 3- phase variable resistor can be inserted in the rotor circuit and
(a) Average rainfall during the month of January is found to be R mm. A Class A pan evaporation recorded an average of [7 + ( R /100)] mm/day near an irrigation reservoir. The av
The devices in power system shown in Figure 2 have the following ratings: G1 : 100 MVA, 13.8 kV grounded Y, X” = 0.15 pu, X2 = 0.015 pu Xo = 0.05 pu G2 : 50 MVA, 20.0 kV grounded
Ask questiwe have half wave rectifier connected to a dc motor load. by using a step down transformer from 8 to 1. by modalization we have the Primary Winding resistance is Rp=50 oh
The increase in the current is building up the magnetic field surrounding the coil. Energy is stored in that field. Consider the energy supplied by the voltage source during the
Q. Explain Integral-error or reset control? A control system is said to possess integral-error control when the generation of the output in some way depends upon the integral o
Quite often an amplifier is used as a component of an amplifier circuit. Consider the amplifier circuit shown in Figure, which contains an amplifier block as an internal component.
Explain the Power Transmission Lines Transmission and distribution of electric power is accomplished by using overhead lines or underground cables. Overhead lines are normally
Equivalent Circuit of a DC Machine A review of the material presented with regard to elementary direct-current machines can be helpful at this stage to recall the principles of
Q A beam containing two types of charged particles is moving from A to B. Particles of type I with charge +3q, and those of type II with charge -2q (where -q is the charge of an el
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd