Power Electronics

Power Semiconductor Devices Power diodes - Power transistors - MOSFET and IGBT - Construction and characteristics of SCR - Turn-on and Turn-off methods - Two-transistor model - Switching performance - Triggering circuits - TRIAC - Snubber circuits - Special semiconductor devices. Phase-Controlled Converters 2-pulse - 3-pulse and 6-pulse converters - Performance measures - Inverter operation of fully controlled converter - Effect of source impedance - Effect of load inductance DC to DC Converters Step-down and step-up choppers - Time ratio control and current limit control - Switching mode regulators - Buck, Boost, Buck-boost and cuk converter - Resonant switching based SMPS. Inverters Forced commutation techniques - Single-phase and three-phase (both 120° mode and 180° mode) inverters - PWM techniques - Voltage and harmonic control - Series resonant inverter - Voltage and current source inverters. AC Voltage Controllers Principle of on-off control and phase control - Single-phase bidirectional controllers with R and RL loads - Three-phase full-wave controllers - Three-phase bidirectional delta-connected controllers - PWM control - Cycloconverters : Single-phase and Three-phase.