Introduction to semiconductors, Power Electronics, Power semiconductor devices, Control Characteristics.Types of power electronic converters and industrial applications-Drives, Electrolysis, Heating, Welding,Static Compensators, SMPS, HVDC power transmission, Thyristorized tap changers and Circuit breakers.
Power BJT’s – switching characteristics, switching limits, base drive control. Power MOSFET’s and IGBT’s –characteristics, gate drive , di/dt and dv/dt limitations. Isolation of gate and base drives. Simple design of gate and base drives.
Introduction, Two Transistor Model, characteristics-static and dynamic. di/dt and dv/dt protection. Ratings of thyristors. Thyristor types. Series and parallel operation of Thyristors. Thyristor firing circuits. Design of firing circuits using UJT, R, R-C circuits. Analysis of firing circuits using operational amplifiers and digital IC’s.
Introduction. Natural Commutation. Forced commutation- self-commutation,impulse commutation, resonant pulse commutation and complementary commutation.
Introduction. Principle of phase controlled converter operation. Single- phase semi-converters. Full converters. Three-phase half-wave converters. Three-phase full-wave converters.
Introduction. Principle of step-down and step-up chopper with R-L load. Performance parameters. Chopper classification. Analysis of impulse commutated thyristor chopper (only qualitative analysis)
Introduction. Principle of operation. Performance parameters. Single-phase bridge inverters. Threephase inverters. Voltage control of single-phase inverters – single pulse width, multiple pulse width,and sinusoidal pulse width modulation. Current source inverters.
(a)AC Voltage Controllers: Introduction. Principle of ON-OFF and phase control. Single-phase, bi- directional controllers with resistive and R-L loads. (b) Electromagnetic Compatibility: Introduction, effect of power electronic converters and remedial measures.