POWER ELECTRONICS Fourth Semester ELECTRICAL AND ELECTRONICS

Department of Technical Education

DIPLOMA COURSE IN ELECTRICAL AND ELECTRONICS ENGINEERING

Fourth Semester

 

Sub:  POWER ELECTRONICS

 

Sub Code:

Contact Hrs/Week: 4                                                                                Contact Hrs/Sem: 64

 

Chapter No.                                                    Topic                                     No. of Hours.

 

UNIT I

        1         Power semiconductor devices                                                           12

        2         SCR controlled circuits                                                                        6

UNIT II

        3         Controlled rectifiers                                                                             5

        4         Choppers                                                                                              2

        5         Inverters                                                                                               4

        6         Cycloconverters                                                                                   2

        7         Device Protection                                                                                6

UNIT III

8                   Power Supplies and Stabilizers                                                            8

9                   Switch Mode Converters                                                                     5

        10       Power Electronics Applications                                                           4

 

        11       Industrial innovations                                                                          6           

        12       Tests and Revision                                                                               4

                                                                                                     __________

                                                          TOTAL                                                        64

                                                                                                                                                                                          

                                                                                                                                                                      

                                                             

 

 

 

CONTENT

 

1             Power Semiconductor Devices                                                                                                          

2             Power Diode, SCR, TRIAC, DIAC, BJT, MOSFET, IGBT                                   

2      SCR control circuits                                                                                                   

         a) Turn-on methods                                                                                                                             

 b) Turn-off methods (Commutation)

3      Controlled Rectifiers (AC to DC Line commutated converters)                               

                                             Principle of phase control                                                                    

                                             Single phase fully controlled bridge rectifier                                      

                                             Three phase fully controlled bridge rectifier                                       

4      Chopper           Step-down, Step-up choppers                                                        

5      Inverter             Single phase half bridge, full bridge and three phase full bridge      

6      Cycloconverters                                                                                                          

7      Device Protection     Rating, Specification and Nomenclature of SCRs                 

                                            Protection of SCRs                                                                               

                                            Selection of SCRs                                                                                

                                            Reliability and failure mechanism of SCRs                              

8      Power Supplies Stabilizers                                                                                          

                                    DC regulated supplies using IC (Linear Power Supplies)                  

                                    Switched Mode Power Supplies(SMPS)                                                      

                                    Power supplies for Battery charger

9              Switch Mode Converters                                                                              

                                   Flyback DC to DC converter.

                                   Forward or buck or step down DC to DC converter.

                                   Boost or step up DC to DC converter.

                                   Buck- boost DC to DC converter.

 

10    Power Electronics Applications.                                                                   

              Speed control of separately excited DC motor by armature voltage control method.

              Speed control of Induction Motor by Variable voltage -frequency   method.

               Optocoupler device construction.                                                               

              Solid state relay SSR.         

             

11      Industrial innovations

 

12      Tests and Revision                                                                                          

 

 

 

 

 

 

 

REFERENCES:

     1. Power Electronics by K Shashidhar, Sapna Publications.

     2. Power Electronics by Mohan, Undeland & Robbins –Wiley India.

3.Power Electronics  By Umanand - Wiley India

 

GENERAL EDUCATIONAL OBJECTIVES:

                                                                      

1            Know the principle of operation, characteristics and applications of power

              Semiconductor devices                                           

2            Understand turn-on and turn-off methods for SCR.                                 

3            Know the operation of controlled rectifier                                     

4            Know the operation of chopper                                          

5            Know the operation of inverter                                                      

6            Know the operation of cycloconverter.                                          

7            Understand ratings, specifications, protection, selection and reliability of SCR.

8            Know the operation of power supplies, stabilizers.

             

                                                                                              

SPECIFIC INSTRUCTIONAL OBJECTIVES

 

1            Power Semiconductor devices                                                                     12hrs

              1.1 Power Diode                                                                

                       1.1.1 Explain V-I characteristic curve of power diode                                  

                       1.1.2 List applications of power diode                                              

              1.2    SCR                                                               

                       1.2.1 Draw the layer diagram of SCR and explain the same             

                       1.2.2 Explain the two transistor analogy of SCR(no derivation)                              

                       1.2.3 Explain the static V-I characteristic curve of SCR                               

                       1.2.4 List applications of SCR                                                           

              1.3    TRIAC                                                                                  

                       1.3.1 Explain the operation of triac and draw its static V-I characteristic curve      

                       1.3.2 List the modes of operation of triac and mention the preferred modes           

                       1.3.3 List applications of triac                                                           

              1.4    DIAC                                                                         

                       1.4.1 Explain the operation of diac and draw its V-I characteristic curve    

                       1.4.2 List applications of diac                                                

              1.5    BJT                                                                

                       1.5.1 Describe the operation of an NPN transistor as a switch                     

                       1.5.2 List the applications of BJT in power switching applications              

                                                                                  

              1.6    MOSFET                                                                  

                       1.6.1 Explain the operation of MOSFET and draw its transfer characteristic curve

                       1.6.2 List applications of MOSFET                                                   

                                                                                  

              1.7    IGBT                                                                         

                       1.7.1 Explain the operation of IGBT and draw its V-I characteristics                      

1.7.2  List applications of IGBT         

1.7.3  Compare IGBT,BJT and MOSFET      

        Reference book: Industrial Electronics and controls-Biswanath paul          Page.No:298        

              Reference Books:                                                    

              1       M Ramamoorthy                                                        

              2       Clay Laster                                                     

              3       Mohan and Rashid                                                     

2            SCR control circuits                                                                                               6hrs    

              2.1    Describe briefly different methods of Turn-ON SCR                       

              2.2    List two general functions to be fulfilled by gate control circuits                 

              2.3    Draw the general layout diagram of firing circuit and explain.         

              2.4    Draw R firing circuit and explain .                            

              2.5    Draw R-C firing circuit and explain.                         

2.6        Draw UJT pulse trigger circuit and explain.

2.7        Explain Digital firing circuit.                         

              2.7    Define commutation                                                  

              2.8    List different types of commutation                                      

              Ref: for 1.2 complete GK Dubey                                       

                                                                                              

3            Controlled Rectifiers                                                                                                5hrs                                                             

              3.1    Explain controlled rectifiers                                                   

              3.2    Explain single quadrant semi converter, two quadrant full converter and dual converter

              3.3    Explain line or natural commutation                                      

      3.4    Explain the principle of phase control and define firing angle (alpha) and conduction angle (beeta)

      3.5    Explain with schematic diagram and waveforms, the operation of single phase half wave controlled converter.

     3.6    Explain with schematic diagram and waveforms, the operation of single phase fully controlled bridge converter                                                        

3.7        Explain with circuit diagram and waveforms the operation of fully controlled three phase bridge  Converter

              Ref: Rashid                                                                        

                       GK Dubey                                                     

                       M Ramamoorthy                                                        

4            Choppers                                                                                                                2hrs    

              4.1    Define chopper                                                                      

        4.2    Draw the basic power circuit (without commutation circuit) of a step down chopper and explain its operation with waveforms     

        4.3    Draw the basic power circuit (without commutation circuit) of a step up chopper and explain its operation with waveforms     

              Ref:  GK Dubey                                                     

                       Dewan

                                                          

5            Inverters                                                                                                                  4hrs

5.1        Define Inverter.

5.2        Classify the inverters based on Source.

5.3        Define Voltage Source Inverter and Current Source Inverter.

5.4        Differentiate between Voltage Source Inverter and Current Source Inverter          

5.5        Draw the schematic diagram of voltage source single phase half bridge inverter (without commutation circuit) and explain its operation                                            

     5.6    Draw the schematic diagram of voltage source single phase full bridge inverter (without commutation circuits) and explain its operation                                          

     5.7    Draw the schematic diagram of voltage source three phase bridge inverter (without commutation circuit) and explain its operation                                            

              Ref   Ramamoorthy                                                

                       Rashid

                        Industrial Electronics and controls-Biswanath paul

                                   Page.No:340 and 341(For  Sections 5.2,5.3 and 5.4)             

                                  

6            Cycloconverters                                                                                                      2hrs    

              6.1    Define cycloconverter and mention its types (step up and step down)         

              6.2    State the advantages and disadvantages of cycloconverter              

              6.3    Draw the diagram of a single phase to single phase cycloconverter and explain

              Ref   Rashid                                                            

7            Device Protection                                                                                                   6hrs

              7.1    Give specifications, ratings and nomenclature of Thyristors,

                       BJT, MOSFET and IGBT                 

              7.2    Describe how SCR can be protected against overvoltage and overcurrent   

              7.3    Describe dv/dt and di/dt protection of SCR                         

              7.4    Describe the process involved in selecting an SCR for a particular application

              7.5    Define reliability of SCR and mean time between failures (MTBF) 

              7.6    Explain the three failures of an SCR (Mechanical, Electrical and Thermal)

              7.7    Explain mounting of SCR with suitable heat sink.                            

                                                                                              

              Ref:  Ramamoorthy                                                

                       Rashid                                                            

                       Dubey                                                            

                       MD Singh, Clay Laster

 

 

                                                                                  

8            Power Supplies, Stabilizers                                                                                   8hrs

              8.1    Draw a schematic diagram of switched mode power supply (SMPS) and explain its operation

              8.2    Compare linear power supply with SMPS                             

              8.3    List the applications of linear power supply and SMPS        

              8.4    Draw a schematic diagram of SCR battery charger and explain                   

              8.5    Define online UPS system and offline UPS system                          

              8.6    Draw a block diagram of UPS system and explain its operation

8.7        Determine  Battery size and required voltage for UPS(Ref: Modern Power

               Electronics by P.C.Sen      Page          No.832 and 833)        

              8.8    List the areas of applications of UPS system

              8.9    Define the different types of power line disturbances such as overvoltage, black out voltage spike, chopped voltage, harmonics, Total Harmonics Distortion factor and EMI               

              8.10  List the sources of power line disturbances of mentioned in 8.9                  

              8.11  Give the effect of power line disturbances on sensitive equipments such as computer

              8.12  Describe how power conditioners provide effective suppressing of some or all of these electrical disturbances                                                   

              8.13  Describe the operation of relay type AC voltage stabilizer with the help of diagram

8.14Draw the diagram of constant voltage transformer (CVT) type AC voltage 

                 stabilizer and explain its operation

              8.15  Draw the diagram of AC servo voltage stabilizer and explain its operation

                                                                                              

              Ref:  Gayakwad                                                      

                       Mohan                                                            

                       Schuler and Mc Namee                                              

                       Bradley                                                                      

                       Harish C Rai                                                  

                       Chute & Chute                                                           

                       MC Sharma                                                    

                       Ramamoorthy

                       Whittington, Universities Press(India) Pvt. Ltd.                   

9            Switch Mode Converters                                                                                       5hrs

             

              9.1    Explain with circuit diagram Flyback DC to DC converter.

              9.2    Explain with circuit diagram Forward or buck or step down DC to DC converter.

              9.3    Explain with circuit diagram boost or step up DC to DC converter.

              9.4    Explain with circuit diagram buck- boost DC to DC converter.

              9.5    Compare buck, boost and buck-boost DC to DC converter.

 

                       Ref: Biswanath Paul   PHI Publication   Edition-II   Page. No:  36 to 44

                                              

10       Power Electronics applications                                                                                4hrs                

10.1    Explain speed control of shunt –wound DC motor by armature voltage control

                       method.

              10.2  Explain speed control of Induction Motor by Variable voltage -frequency   method.

              Ref: Biswanath Paul PHI Publication   Edition-II  Page.No:  403 to 405,408 to 419

              10.3  Give basic optocoupler device construction and explain                                           

              10.4 Circuit diagram of solid state relay SSR and explain            

10.5    State the advantages of SSR over electromechanical relay and give its applications

 11   Industrial innovation and seminars (Not for end examination)                                6hrs

11.1    seminars by industrial experts/academic experts/visit  to nearby industry

 

12    Tests and revision                                                                                                        4hrs    

                                                                                                                      

                                                                                                           Total                         64hrs

 

 

 

 

 

 

 

POWER ELECTRONICS

TENTATIVE CHAPTER WISE MARK DIVISION

 

 

 

Hours

Approx Total marks for setting questions in the chapter

UNIT I

 

 

 

1

Power semiconductor devices

12

30

2

SCR controlled circuits

6

15

 

 

 

 

 

 

 

 

UNIT II

 

 

 

3

Controlled rectifiers

5

15

4

Choppers

2

5

5

Inverters

4

10

6

Cycloconverters

2

5

7

Device Protection

6

15

 

 

 

 

 

 

 

 

UNIT III

 

 

 

8

 Power Supplies and Stabilizers

8

20

9

Switch Mode Converters

5

10

10

Power Electronics Applications

4

10

 

 

 

 

11

Industrial innovations

6 (Ex)

 

12

Tests and Revision

4 (Ex)

 

 

TOTAL

54

135

 

There is a compulsory part of 10 marks in the beginning, out of which, 05 marks is for “Fill in the blanks” type questions.

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