Syllabus

Power Electronic Devices: Diodes, Transistors, Thyristors, MOSFET and IGBT - operating principle, Static, dynamic and thermal characteristics, Data sheet ratings, gate drive circuits Single phase half controlled and fully controlled AC/DC bridge converter with R, R-L, R-L-E (motor) loads: operation (both rectifier and inverter modes) , waveforms ,harmonics (output voltage/current and input current) assuming continuous conduction, input current (ac) displacement, distortion and power factor, effect of input line inductance assuming constant current dc load, closed form expression of output dc current with general R-L-E load, discontinuous conduction mode of operation, Torque-speed characteristics of converter controlled separately excited dc motor in continuous and discontinuous mode of conduction Three phase half controlled and fully controlled AC/DC bridge converter assuming constant dc current load : operation in rectifier and inverter modes, waveforms, output voltage and input current harmonics, input power factor and effect of input line inductance, series and parallel operation of converters, power factor improvement, 12 pulse/18 pulse operation, transformer connection, dual converters DC-DC choppers: basic voltage commutated thyristor chopper analysis , Separately excited DC motor drive using DC-DC choppers made of gate controlled devices, four quadrant operation, dynamic and regenerative braking of series DC motor using choppers Basic DC-DC converters: buck, boost buck-boost and Cuk converter, operation, waveforms and design DC-AC inverters using gate controlled devices: single phase and three phase square wave inverters, operation waveforms and harmonics in pole voltage, load phase voltage and line voltage, output voltage control in single phase square wave inverter using chopper control and phase shift, harmonic analysis, operating principles of single phase and three phase PWM inverters, modulation techniques, SPWM, Selective Harmonic Elimination PWM and delta modulation, harmonic spectrum and comparison among different PWM techniques Variable frequency operation of three phase induction motors: Steady state analysis, Torque-speed , current-speed and slip frequency -speed characteristics and operating limits with constant volts/Hz and constant air gap flux operation, implementation using PWM VSI.

To analysis the operation of the different power electronic converters with various loads

To study chopper fed dc motor drives.

To study inverters of various configurations and their modulation techniques

1: Competency in the design and analysis of 1-ph and 3-ph controlled rectifiers with different loads.
2: Skill in designing and analyzing DC-DC converters
3: Skill in designing and analyzing Inverters
4: To understand and implement various modulation techniques in Inverters

N. Mohan, T.M. Undeland& W.P. Robbins, Power Electronics: Converter, Applications & Design, John Wiley & Sons , New York, 2003

G. K. Dubey, Fundamentals of Electrical Drives, Narosa Publishing House , 2002

M.H. Rashid, Power Electronics, Circuits, Devices, and Applications, Pearson , 2003

B. K. Bose, Modern Power Electronics and A.C. Drives, PHI , 2002