Time : 3 Hrs.                                                                                                                                            Theory : 100 Marks Term Work : 25 Marks Practical and Oral : 25 Marks



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1.   Power Semiconductor Devices :

(a)  Introduction to construction, characteristics, ratings, data sheets and applications of power diodes, power BJT, power MOSFET, SIT and IGBT.

(b) Study of Thyristors  : constructions,  characteristics,  ratings of SCR, TRIAC, MCT, GTO and


(c)  Comparison and selection criteria for above devices.

(d) Switching  /  triggering  method  :  Switching  methods  /  types  of  triggering,  triggering  devices

DIAC, SUS, 585, UJT and PUT.

(e)  Thyristors Communication Techniques.

(f)  Protection Scheme against over-current, over-voltage, dv/dt and di/dt.


2.   Thyristor Application :

(a)  Controlled rectifiers : Principles of operations of phase controlled converters, single phase half bridge, semi converter and bridge converters.

Design of SCR based DC power circuits including UJT as triggering device and application.

(b) AC  power  control  using  SCR-UJT  and  TRIAC-DIAC  like  universal  speed  controller  fan regulator. Design of SCR/TRIAC based AC power control circuits  including  UJT/DIAC  as a triggering device.


3.   Inverters :

Principles of operation of inverters, PWM  inverter, series and parallel inverters, bridge inverter, basic circuit scheme of IGBT/Power MOSFET based inverter circuits. Suitability in different applications of different capacities and frequencies operation. Principle of ZVC/ZCS resonant converters.


4.   Choppers :

Basic operation of choppers, study of different types of simple chopper circuits like step up choppers, step down choppers and Jones chopper, DC motor speed control application using chopper.


5.   Switch Mode Power Supplies :

Basic  concept  schemes,  Working  principles  of  Buck,  Boost,  Buck-Boost  converter  merits  and demerits and applications.


6.   Drives :

(a)  AC Motor Drives : Concept and requirement of drives, Current fed and voltage fed drives, PWM

technique (using IGBT/BJT) for control.

(b) DC Motor Drives : DC drives for brushed/brushless  motors, methods of motor  control using constant voltage and constant current techniques.


7.   Industrial Applications :

(a)  Induction and Dielectric heating process, Block diagram, Merits/demerits and applications. (b) Temperature controller using thyristor principle and circuit scheme.







Reference :

1.   Power Electronics (P.S. Bimbhra) Khanna Publishers – 2004.

2.   Power Electronics (M.H. Rashid) PHI – 2005 (2nd Edition).

3.   Power Electronics (P.C. Sen) Tata McGraw Hill – 2005.

4.   Power Electronics − Converters Application and Design (Mohan, Undeland Robbins) Wiley Eastern –


5.   Thyristorised Power Controller (Dubey, Doralda)  Wiley Eastern Ltd. – 1993.

6.   Power Electronics and Control (Samir K. Datte) PHI – 1986.

7.   Industrial Electronics and Control (S.K. Bhattacharya) Tata McGraw Hill – 2007.

8.   Modern Power Electroncis (P.C. Sen) Wheeler Publications – 1992.

9.   Practical Transistor Circuits − Design and Analysis (Jerrald  E. William) Tata McGraw Hill – 1976.

10. Power Electronics System Theory and Design (Jai P. Aggarwal) Pearson Education Asia – 2001.

11. Power Electronics (Vedam Subrahmanyam) New Edge Intl – 2000.



All syllabus in single     Download  PDF  .