1. Thyristor and other Power Semiconductor Devices 8 hours
1.1
Devices
belonging to the thyristor family:
Thyristor, Triac, GTO thyristor,
MOS-controlled thyristor, Static Induction Thyristor.
1.2
Two-transistor
model of a Thyristor, Thyristor Characteristics, Gating Requirements, Thyristor
Firing Circuits and their Control Features, UJT, PUT.
1.3
Thyristor
turn-on and turn-off Mechanisms, Ratings, Losses and Cooling.
1.4
Series
and Parallel operation of Thyristors, Overcurrent and Overvoltage
Protection; di/dt and dv/dt Protection.
1.5
Other
Power Electronic Devices: Power transistor, Power MOSFET, IGBT.
I [1
(1.2-1.11), 10 (10.1, 10.2)]; II [4(4.2-4.13)]
2. Controlled Rectifier Circuits and
Converter operation 8
hours
2.1 Single-phase Half-wave, Bi-phase Half-wave
and Single-phase Bridge (or full-wave) configurations.
2.2 Three-phase Half-wave, Six-phase Half-wave
and Three phase Bridge (or full wave)
Configurations, twelve-pulse circuits.
2.3 Transformer Ratings for Rectifying circuits.
2.4 Inverting
mode of a Converter, Regulation.
2.5
Three-phase Dual
converters; Power Factor Improvement techniques: Extinction angle control,
Symmetrical angle control, Pulse Width Modulation (PWM), Sinusoidal PWM.
2.6
Design of converter
circuits, effect of load and source impedances (overlap), Gating Circuits.
I
[2 (2.1-2.11), 3 (3.1-3.4)], II [5(5.1-5.4)]
3. D C Choppers 8 hours
3.1
Principles of Step-down Choppers and their operation
with RL load, Step-up choppers.
3.2
Chopper classification, class A, B, C, D and E
Choppers.
3.3
Switching mode Regulators: Buck, Boost, Buck-boost
and Cu’k Regulators.
3.4
Thyristor Chopper circuits: Impulse-commutated
choppers, Effects of source and load inductance, Resonant Pulse Choppers.
3.5
Chopper circuit design.
II [9
(9.1-9.9)]
4. Thyristor Commutation Techniques 6
hours
4.2 Forced-commutation
techniques: Self, Impulse, Resonant pulse, Complementary, External pulse, Load
side and Line side Commutation circuits.
4.3 Commutation
circuit design.
II [7 (7.1-7.4)]
5. A
C Voltage Controllers 8
hours
5.1
On-off
and Phase control principles.
5.2
Single-phase
AC controllers with Resistive and Inductive loads.
5.3
Three-phase
AC controllers: Half-wave, Full-wave and Bidirectional delta connection
configurations.
5.4
Single-phase
Transformer-tap changers.
5.5
Design
of AC Voltage-controller circuits.
5.6
Effects
of Source and Load Inductances.
II [6 (6.1-6.9, 6.11-6.13)]
6.
Cycloconverters 8
hours
6.1 Principle of a
Single-phase Cycloconverter.
6.2 Blocked Group
Operation.
6.3 Circulating current
mode.
6.4 Control of a
cycloconverter.
6.5 Three-phase
cycloconverters, Reduction of output harmonics.
I
[5 (5.1)]; II [6 (6.10)]
7.
Inverter Circuits 8
hours
7.1 Single-phase
Center-tapped Inverter.
7.2 Single-phase
Half-bridge and bridge configurations.
7.3 Three-phase Inverters:
180-degree and 120-degree conduction.
7.4 Voltage control of
Single-phase Inverters: Single PWM, Multiple PWM and Sinusoidal PWM.
7.5 Voltage control of
Three-phase Inverters.
I
[5 (5.3)]; II [10 (10.1-10.7)]
8.
D C and A C Drives 6
hours
8.1 Basic
Characteristics and Operating modes of D C Motors.
8.2 Single-phase
and three-phase Converter Drives.
8.3 Chopper
Drives, principles of Regenerative Braking and Rheostatic Braking controls.
8.4 Induction
Motor Drives and their Performance Characteristics.
8.5 Speed
and Torque variation using the various controls: Stator voltage,
Rotor-voltage, Frequency and Stator
Current controls.
8.6
Industrial
Applications of DC and AC Drives.
8.7
Microprocessors
in the control of Electrical Drives.
I
[8 (8.6), 9(9.12)]; II [14 (14.1-14.6), 15 (15.1-15.2)]; III [7 (7.1-7.6)]
I. Cyril W Lander, “Power Electronics”, McGraw Hill Book
company, Singapore (1993).
II. Muhammad H Rashid, “Power
Electronics-Circuits, Devices and Applications”, New Delhi, 2001.
III. Vedam Subrahmanyam,
“Thyristor Control of Electric Drives”, New Delhi,1998