Subject Code:55013 L:4 T/P/D:1 Credits:4 Int. Marks:25 Ext. Marks:75 Total Marks:100
UNIT I: POWER SEMI CONDUCTOR DEVICES
Thyristors – Silicon Controlled Recti fiers (SCR’s) – BJT – Power MOSFET – Power IGBT and their characteristics and other thyristors – Basic theory of operation of SCR – Static characteristics – Turn on and turn off methods- Dynamic characteristics of SCR - Turn on and Turn off times -Salient points
UNIT II: DEVICES AND COMMUTATION CIRCUITS
Two transistor analogy – SCR - UJT firing circuit ––– Series and parallel connections of SCR’s – Snubber circuit details – Specifications and Ratings of SCR’s, BJT, IGBT - Numerical problems – Line Commutation and Forced Commutation circuits.
UNIT III: SINGLE PHASE HALF CONTROLLED CONVERTERS
Phase control technique – Singl e phase Line commutated converters – Mid point and Bridge connections – Half controlled converters with Resi sti ve, RL loads and RLE load– Derivation of average load voltage and current - Active and Reactive power inputs to the converters without and with Free wheeling Diode –Numerical problems
UNIT IV: SINGLE PHASE FULLY CONTROLLED CONVERTERS
Fully controlled converters, Mid poi nt and Bridge connections with Resistive, RL loads and RLE load– Derivation of average load voltage and current – Line commutated inverters -Active and Reactive power inputs to the converters without and with Free wheeling Diode, Effect of source inductance – Derivation of load voltage and current – Numerical problems
UNIT V: THREE PHASE LINE COMMUTATED CONVERTERS
Three pulse and six pulse converters – Mid point and bridge connections average loadvol tage With R and RL loads – Effect of Source inductance–Dual converters (both single phase and three phase) - Waveforms –Numerical Problems.
UNIT VI: AC VOLTAGE CONTROLLERS & CYCLO CONVERTERS
Single phase two SCR’s i n anti parallel – With R and RL loads – modes of operation of Triac – Triac with R and RL loads – Derivation of RMS load voltage, current and power factor wave forms – Firing circuits -Numerical problems -Cyclo converters – Single phase mid point cyclo converters with Resistive and inductive load (Principl e of operation only) – Bridge configuration of single phase cyclo converter (Principle of operation only) – Waveforms
UNIT VII: CHOPPERS
– Time rati o control and Current limit control strategies – Step down choppers Derivation of load vol tage and currents wi th R, RL and RLE loads- Step up Chopper – load voltage expression Morgan’ s chopper – Jones chopper and Oscillation chopper (Principle of operation only) Waveforms
UNIT VIII: INVERTERS
Inverters – Single phase inverter – Basic series inverter – Basic parallel Capacitor inverter bridge inverter –Waveforms – Simple forced commutation circuits for bridge inverters – Mc Murray and Mc Murray – Bedford inverters - Voltage control techniques for inverters Pulse width modulation techniques – Numerical problems.
TEXT BOOKS:
Power Electronics – by M. D. Singh & K. B. Kanchandhani, Tata Mc Graw – Hill Publishing company, 1998.
2. Power Electronics : Circuits, Devices and Applications – by M. H. Rashid, Prentice Hall of India, 2 edition, 1998
REFERENCE BOOKS:
. Power Electronics – by Vedam Subramanyam, New Age International (P) Limited, Publishers
. Power Electronics - by V.R.Murthy , 1 edition -2005, OXFORD University Press
Power Electronics-by P.C.Sen,Tata Mc Graw-Hill Publishing.
Thyristorised Power Controllers – by G. K. Dubey, S. R. Doradra, A. Joshi and R. M. K. Sinha, New Age International (P) Limited Publishers, 1996.