EE 443.3 Lecture Schedule  

Week

Contents

1

Transient and steady state voltages and currents in resistive, inductive, RL and RC circuits, voltage and currents in an inductive load circuit with a free-wheeling diode, half-wave rectifier (diode) circuit with a resistive load, average and rms output voltage and current, half-wave diode rectifier circuit with a RC load circuit

2

Half-wave diode rectifier circuit with a RL load; average and rms output voltage and current, conduction angle; numerical example on output voltage and current calculations in a half-wave diode rectifier circuit with a RL load, half-wave rectifier circuit with a RL load and a free-wheeling diode, evaluation of output voltage and current in a half-wave rectifier circuit with a RL load and a free-wheeling diode

3

Power semiconductor switches, diodes, thyristors, BJTs, MOSFETs and GTOs, reverse recovery time, turn-off time, losses in semiconductor switches, half-wave thyristor rectifier circuit with resistive, RL and inductive load circuits, effect of delaying thyristor gate current, time dependent expression for output current, evaluation of the conduction angle from the current expression, average and rms values of output voltage and current

4

Numerical example on output voltage and current in a thyristor controlled half-wave rectifier circuit with a RL load, thyristor controlled half-wave rectifier circuit with RL load and EMF source, commutation, line commutation, load commutation and forced commutation, Single-phase full-wave rectifiers; transformer between the source and the converter, single-phase full-wave controlled rectifiers

5

continuous current and discontinuous current in single-phase rectifiers, average output voltage and output current, harmonic analysis of the output with Fourier transform, average and rms current ratings of thyristors (transistors) in a single-phase full-wave rectifier circuit, numerical example of a single-phase full-wave rectifier

6

transfer (commutation) of current from one thyristor to another in a single-phase rectifier, numerical example of a single phase full-wave rectifier; uncontrolled three-phase half-wave rectifiers, output voltage and current; controlled Three-phase half wave rectifiers, average and rms output voltage and currents; three-phase full-wave rectifiers, controlled and uncontrolled, average and rms output voltage and currents, input line current of a three-phase full-wave rectifier, harmonics in the output, average and rms thyristor currents

7

numerical example of a three-phase full-wave rectifier, effect of ac side inductance on the performance of a three-phase full-wave rectifier; dc motor drive with a separately excited field, steady-state model of a separately excited dc motor, relationship of armature circuit variables, dual converters, regenerative breaking

8

block diagram of a closed-loop position/speed dc servo drive, constant torque and constant power operation, DC to DC converter, choppers, type B chopper with regeneration, analysis of a type A chopper, 

9

Load current of a Type A chopper, conditions for continuous and discontinuous load current, output voltage under continuous and discontinuous load currents of a chopper, numerical examples on output current, voltage and peak current of a chopper, Fourier analysis of the output voltage of a chopper

10

Analysis of a boost chopper, output current of a boost chopper, conditions for discontinuous current in a boost chopper, output voltage and the maximum and the minimum currents through the main switch and the diode in the boost chopper, numerical example

11

DC to AC converters, application of dc to ac converters, output voltage and current of a Single-phase half bridge inverter, harmonic contents at the output of an inverter, current through the switches and the anti-parallel diodes in a half-bridge inverter, full-bridge inverter, 3-phase inverters, 

12

Voltage control in inverters, multiple pulsed-width modulation, sinusoidal pulsed-width modulation; reduction of harmonics from the output voltage of an inverter, pulsed-width modulation technique of harmonic reduction

13

Snubber Circuits, turn-on, turn-off and overvoltage snubber circuits, di/dt and dv/dt protection of thyristors.