5EE1 POWER ELECTRONICS-I

1. SEMICONDUCTOR POWER DEVICES: Characteristics of power Diodes. power Transistor. Diac and UJT

2. SCR: Construction and characteristics, specification and ratings, pulse transformer, optical isolators, methods of turn on:R, RC, UJT relaxation oscillator, blocking oscillator and flipflop firing. Rating extension by series and parallel connections, string efficiency. Protection of SCR protection against over voltage, over current,dv/dt, di/dt,switching surges, over heating. Gate protection.

3. CONVERTERS: Half wave converters for single,two,three,six phase. Single phase and three phase full wave converrtor with R,RL and RLE loads. Performance factors for line commutated coverters. Firing circuits for line commutated converters.Inversion operation. Semi converters,dual converter. Effect of source impedance. Microprocessor based firing scheme for three phase fully controlled bridge converter.

4. CHOPPERS: Principle of chopper operation. control strategies. stepup/Down chopper. choppercongifuration. chopper commutation. AC Chopper. Source filter.Multiphase chopper. chopper firing circuit.

RECOMMENDED BOOKS:

1. M.H Rashid:Power Electronics, circuits devices and applications, PHI,1988.

2. V Subrahmanyam:Power electronics, New Age Inc.Publishers,New Delhi,1996

3. P.C. Sen:Power electronics Tata McGraw-Hill 1987

4. CW Lander:Power electronics,2nd edition, McGrawHill 1987

5. P.S Bimbhra:Power electronics, 2nd Ed. Khanna Publishers,1987

6. M.D.Singh and K.B. Khanchandani:Power electronics, TMH,1998.