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  Power electronics Two Transistor Model of SCR full explain and pdf. Basic operating principle of SCR, can easily be understood by the two transistor model of SCR , as it is a combination of p and n layers. This is a pnpn thyristor. If we bisect it through the dotted line then we will get two transistors i.e. one pnp transistor with J 1 and J 2 junctions and another is with J 2 and J 3 junctions as shown in figure below. The relation between the collector current and emitter current is shown below Here, I C is collector current, I E is emitter current, I CBO is forward leakage current, α is common base forward current gain and relationship between I C and I B is Where, I B is base current and β is common emitter forward current gain. Let’s for transistor T 1 this relation holds And that for transistor T 2 Now, by the analysis of two transistors model we can get anode current, From equation (i) and (ii), we get, If applied gate current is I g then cathode current will b...

  Insulated Gate Bipolar Transistor What is an IGBT? IGBT is the short form of  Insulated Gate Bipolar Transistor . It is a three-terminal semiconductor switching device that can be used for fast switching with high efficiency in many types of electronic devices. These devices are mostly used in amplifiers for switching/processing complex wave patters with pulse width modulation (PWM). The typical  symbol of IGBT    along with its image is shown below.     As mentioned earlier an IGBT is a fusion between a BJT and MOSFET.    The symbol of the IGBT also represents the same, as you can see the input side represents a MOSFET with a Gate terminal and the output side represents a BJT with Collector and Emitter. The Collector and the Emitter are the conduction terminals and the  gate is the control terminal  with which the switching operation is controlled.   Internal Structure of IGBT IGBT can be constructed with the equivalent circ...

  Parallel Magnetic Circuit Definition:  A magnetic circuit having two or more than two paths for the magnetic flux is called a  parallel magnetic circuit . Its behaviour can be compared to the parallel electric circuit. The parallel magnetic circuit contains different dimensional areas and materials having various numbers of paths. The above figure shows a parallel magnetic circuit. In this circuit, a current-carrying coil is wound on the central limb AB. This coil sets up the magnetic flux φ 1  in the central limb of the circuit. The flux φ 1  which is in the upward direction is further divided into two paths namely ADCB and AFEB. The path ADCB carries flux φ 2 , and the path AFEB carries flux φ 3 . It is clearly seen fro the above circuit that φ 1  = φ 2  + φ 3 The two magnetic paths ADCB and AFEB form the parallel magnetic circuit, thus, the ampere-turns (ATs) required for this parallel circuit are equal to the ampere-turns (ATs) required for any o...

The flux density B = Φ/A magnetising force H. Thus greater the magnetising force H, greater will be the magnetic H = constant = 4 π x 10 -⁷ flux density produced in the mate Thus in a vacuum, air or non-magnetic material the ratio B/H is constant. This constant is called the permeability of free space or magnetic space constant  It is denoted by μ0 Its unit is Henry/metre (H/m) μ0=B/H  = 4π × 10-⁷ B = μoH   It was Relation between B and H in magnetic field 

 Explain about addition of vector. Consider two coplanar vectors as shown in the fig The vectors which lie in the same plane are called coplanar vectors. Let us find the sum of these two vectors Ā and B The procedure is to move one of the two vectors parallel to itself at the tip of the other vector. Thus move Ā  parallel to itself at the tip of B. Then join tip of A moved, to the origin. This vector represents resultant which is the addition of the two vectors A and B. This is shown in the Fig. 1.4.2. Let us denote this resultant as then It must be remembered that the direction of C is from origin O to the tip of the vector moved. Another point which can be noticed that if B is moved parallel to itself at the tip of A, we get the same resultant C Thus, the order of the addition is not important. The addition of vectors obeys the commutative law ie. A+B=B+A. Another method of performing the addition of vectors is the parallelogram rule. Complete the parallelogram as shown in t...

Electromagnetic fields Unit vector- A unit vector has a function to indicate the direction. Its magnitude is always unity, irrespective of the direction which it indicates and the co-ordinate system under consideration. Thus for any vector, to indicate its direction a unit vector can be used. Consider a unit vector āoA in the direction of OA as shown in o the Fig. This vector indicates the direction of OA but its magnitude is unity. Fig Unit vector aOA So vector OA can be represented completely as its magnitude R and the direction indicated by unit vector along its direction. ŌĀ = |OA| āOA =R āOA āOA=1

 NOTICE TERM FEE EVEN SEMESTER 2020-21 All the students of B.E Sem 4 (Excluding D to D), 6 and 8 are hereby informed to submit their institute term fees (for Even semester 2020-21 only) in the tuition fees head only. The students have to pay the tuition fees as per the government norms. Term fees can only be paid through HDFC Collect Government Engineering College, Rajkot in ONLINE FEE submission mode via Internet Banking. ATM Credit/Debit card and other mode. The link to pay fees is   http://www.gecrj.ctegul.in/studentsection  STUDENT E CORNER GECR - HDFC COLLECT. The last date for Last date  paying fees is 31-03-2021. Official proof