Power Electronics – I - [2150903]


Teaching Scheme

Tutorial Practical Total
3 0 2 5

Examination Scheme

Theory Examination Practical Examination Total
ESE (E) PA (M) ESE Viva (V) PA (I)
70 30 30 20 150

    ESE = End Semester Examination, PA = Progressive Assessment

Course Type   

Syllabus Content

Construction and Characteristics of Power diodes, Power Transistors, Power MOSFET, Insulated Gate Bipolar transistors (IGBTs) Introduction to Thyristor family : SCR, DIACs, TRIACs, Light Activated SCRs (LASCRs), Reverse Conducting Thyristor , (RCT), Asymmetrical SCR (ASCR), Gate turn-off Thyristors (GTOs), Integrated Gate- Commutated Thyristors (IGCTs), MOS controlled Thyristors (MCTs) Power Integrated circuits (PICs), Intelligent Modules
Construction of SCR, Operating modes, Two transistor analogy, Static & dynamic characteristics, Gate characteristics, Turn on & turn off methods (Commutation methods), Series and Parallel operations of SCRs : Need, String efficiency, Issues, Static and Dynamic Equalizing circuit and Means to minimize the effect of mis-match Isolation of gate and base drive using pulse transformer and Optocouplers Gate Drive/Triggering circuits: R trigger, RC trigger, Cosine Triggering, UJT and Programmable UJT as an oscillator and triggering circuit based on them Ratings, Cooling and Heat sinks, Thermal Modeling, di/dt and dv/dt protection, Design of Snubber Circuit, Over Voltage and Over Current protections, Gate protections, Electro Magnetic Interference(EMI) and Shielding
Review of half-wave and full-wave diode rectifier (with RL load); Principle of phase controlled converter operation; Operation of 1-phase half wave converter with R, RL and RLE load; Significance of freewheeling diode ; 1- phase full wave converter : Center-tapped and Bridge Configuration; Operation and analysis with R,RL, RLE load; Analysis; Gating Requirements; Conversion (Rectification) and Inversion mode of operation; Operation and analysis of 1-phase Semi-converter/ Halfcontrolled converter: Asymmetric and Symmetric Configurations; 3-phase converters : Operation of half wave converter; Full wave fully controlled converters: Analysis and operation with different type of loads; Rectification and Inversion Mode; Semi-controlled converter; Dual Converter: Principle and operation; 1-phase and 3-phase configurations; Simultaneous and Non-simultaneous operation Effect of source and load inductances, Power factor improvement techniques, Applications of AC-DC converters
The chopper, Basic principle of DC chopper, Classification of DC choppers, Control strategies Basic DC-DC converter (switch regulator) topologies : Principle, operation and analysis for Step-down (Buck), Step-up (Boost), Step up/down (Buck-Boost), Continuous conduction and Discontinuous conduction operation Chopper configurations: Voltage Commutated, Current Commutated, Load Commutated Chopper Multi-phase chopper, Application of DC to DC converters
Basic characteristics of DC motors, Two zone operation, Four quadrant operation (Operating modes), Principles of DC motor speed control Single phase separately excited drives: Half Wave converter, Semiconverter and Fully Controlled converter based drives; Braking operation of separately excited drive Single phase Series DC motor drive: Semi-converter and Fully Controlled coverter based drives 3-phase separately excited drives: Half Wave converter, Semi-converter and Fully Controlled converter based drives;
Principle of power control (motoring control) of separately excited and series motor with DC-DC Converter; Steady- state analysis Principle of Regenerative Braking; Chopper configuration for Regenerative braking; Analysis for minimum and maximum speed for Regenerative Braking; Combined regenerative and rheostatic brake control; Two and four quadrant DC-DC converter drives

Reference Books

SrTitleAuthorPublicationAmazon Link
1Power electronicsM D Singh and K B KhanchandaniTMH, New Delhi   
2Power Electronics - Circuits, Devices and ApplicationsMuhammad H. Rashid`Prentice Hall of India   
3Power Electronics – Devices, Converters and ApplicationsVedam SubramanyamNew Age International Publishers Pvt. Ltd.   
4Power ElectronicsP.S. BimbhraKhanna Publishers, New Delhi   

Course Outcome

After learning the course the students should be able to:

  • Explain the construction and characteristics of Power semiconductor devices and fundamental of thyristors and family.
  • Analyze, operate and design ac-to-dc converters.
  • Analyze, operate and design dc-to-dc converters.
  • Apply the knowledge of power electronic converter for speed control of DC motors.
  • Simulate power electronic converters and their control scheme.