Unit 1 Characteristics of Semiconductor Power Devices

12 lecture hours

• power MOSFET and IGBT- Treatment should consist of structure
• protections and thermal considerations
• Brief introduction to power devices viz
• MOS controlled thyristor (MCT)
• Power Integrated Circuit (PIC) (Smart Power)
• commutation and snubber circuits for thyristor
• power MOSFETs and IGBTs (discrete and IC based).Concept of fast recovery and schottky diodes as freewheeling and feedbackdiode

Unit 2 Controlled Rectifiers

10 lecture hours

• Single phase: Study of semi and full bridge converters for R, RL, RLE and level loads
• Analysis of load voltage and input current- Derivations of load form factor and ripple factor
• Effect of source impedance
• Input current Fourier series analysis of input current to derive input supply power factor
• displacement factor and harmonicfactor

Unit 3 Choppers

10 lecture hours

• Principle of chopper operation
• control strategies
• Analysis of Step-Up
• Step-down and Step-Up/Down chopper.Quadrant operations of Type A, Type B, Type C, Type D and type E choppers
• Control techniques for choppers – TRC and CLC, Detailed analysis of Type A chopper
• Step up chopper
• Multiphase Choppers

Unit 4 Single-phase inverters

• Principle of operation of full bridge square wave
• quasi-square wave
• PWM inverters and comparison of their performance
• Driver circuits for above inverters and mathematical analysis of output (Fourier series) voltage andharmonic control at output of inverter (Fourier analysis of output voltage)
• Filters at the output of 10 Subject Code: 3151106 w.e.f