Power Electronics : Question Papers

Question paper of Rajasthan Technical University (R.T.U.) asked in previous years have been uploaded. You can down and read these questions as questions are repeatedly asked in exams.

Subject Code : 5EE1A
Subject : Power Electronics
University : R.T.U. (Rajasthan Technical University)
Semester : 5th
Branch : Electrical Engineering

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Commutation Techniques of SCR (Thyristor) : Power Electronics

SCR (Silicon Controlled Rectifier) is a switch, which is a part of Thyristor family. To turn off this this controlled switch, different methods are used. Sometimes, it is self commutated and sometime forced commutation is required. The commutation techniques used depends upon the type of supply, the required output waveform and on the type of load.

Download the notes in high quality PDF file (19 MB), from below link:

Commutation Techniques of SCR ( Thyristor )

Download same notes in medium size PDF (8 MB), from second link:

Commutation Techniques of SCR ( Thyristor ) , Link 2

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Download the notes in high quality PDF file (19 MB), from below link:

Commutation Techniques of SCR ( Thyristor )

Download same notes in medium size PDF (8 MB), from second link:

Commutation Techniques of SCR ( Thyristor ) , Link 2

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Turn ON methods of SCR (Thyristor) : Power Electronics

Download the notes in pdf (5 MB) from below link:

Turn ON methods of SCR (Thyristor)

Download the same notes in pdf of  medium file size (2 MB), from 2nd link:

Turn ON methods of SCR (Thyristor), Link 2

This post consist of the following topics of Power Electronics:

Turn ON methods of SCR

1. Forward Voltage triggering method

2. Light triggering method

3. Thermal triggering

4. dV/dt triggering method

5. Gate triggering

• Continuous gate signal
• Pulse gate triggering
• High frequency gate signal

6. Need of Pulse transformer in firing circuit

7. Diode circuit with LC load, and DC supply

8. Conduction angle of diode when only inductor or capacitor connected to ac supply

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Power Diode, Semiconductor Controlled Rectifier (Thyristor) :: Power Electronics

Download the notes from below link (14 MB) :

Power Electronics : Power Diode, SCR

Download  the same notes in medium file size (6 MB), from 2nd link

Power Electronics: Power Diode, SCR, Link 2

This notes consists of the following Topics:

1. Power Semiconductor Devices
2. Different modes of operation of generalized switch
          a) Forward Blocking
          b) Forward Conduction
          c) Reverse Blocking
          d) Reverse Conduction
3. Power Diode
4. Reverse Recovery Characteristics of a Diode
5. Classification of Power Diode based on Reverse Recovery Characteristics
6. SCR
          a) Forward Voltage Blocking Mode
          b) Forward Conduction
 -- Significance of GATE Signal
          c) Reverse Blocking Mode
-- Significance of Latching Current
--Significance of Holding Current
7. Procedure to turn off SCR using Commutation Circuit
8. Switching Characteristics of SCR
          a) Delay Time
          b) Rise Time
          c) Spread Time
          d) Turn On Time
          e) Reverse Recovery Time

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