Unit 1 Semiconductor Devices

• Review of Semiconductor devices like Power BJT, SCR, MOSFET
• IGBT, GTO, MCT
• Static and dynamic characteristics of these devices
• Single quadrant
• Two quadrant and bid-directional switches. 4 7.5

Unit 2 Switching Voltage Regulators

8 lecture hours

• Linear power supply (voltage regulators)
• Switching voltage regulators
• Review of basic dc-dc voltage regulator configurations -Buck
• Buck-Boost converters and their analysis for continuous and discontinuous mode
• Other converter configurations like Flyback converter
• Forward converter
• Half bridge
• Full bridge configurations
• Push-pull converter
• C’uk converter
• Sepic Converter
• Design criteria for SMPS
• Multi-output switch mode regulator

Unit 3 Design of Magnetic Components

8 lecture hours

• Design of power transformer
• high frequency transformers for flyback
• half-bridge – full bridge and push pull converters
• Design of inductors for various converter topologies
• Design of current transformers
• Different types of core materials

Unit 4 Line Commutated Converters

8 lecture hours

• Single phase and three phase half wave and full wave
• 1-phase and 3- phase half controlled and fully controlled converters
• Analysis with R & RL load
• Performance parameters for converters
• Operation in continuous and dis-continuous mode
• Operation in conversion and inversion mode
• Effect of source inductance
• Power factor improvement techniques
• Dual Converters

Unit 5 Classification; Review of line commutated inverters, Concept of

9 lecture hours

• Unipolar and Bipolar PWM, Sine-triangular PWM, Space Vector Pulse Width Modulation
• Other PWM techniques
• Harmonic reduction techniques
• Current Source Inverters
• Impedance source inverters

Unit 6 Gate and Base drive circuits

• Preliminary design considerations
• DC coupled drive circuits with unipolar and bipolar outputs
• Importance of isolation in driver circuits
• Electrically isolated drive circuits
• Some commonly available driver chips (based on boot-strap capacitor)
• Cascode connected drive circuits
• Thyristor drive circuits
• Protection in driver circuits
• Blanking circuits for bridge inverters. 5 7.5

Unit 7 Three phase AC voltage controllers and Cycloconverters

8 lecture hours

• AC voltage controllers: Review of On-off and phase control
• Single phase full wave controllers and their analysis with resistive loads
• Three phase full wave controllers
• Analysis with R-load
• Three phase bi-directional delta-connected controllers Cycloconverters: single-phase to single-phase cycloconverter
• 3-phase to 1-phase cyclo-converter
• 3-phase to 3-phase cycloconverter circuits
• circulating current operation
• non-circulating current operation
• mean output voltage and harmonics in supply current waveform ** Some topics (especially related to design) may be covered as a part of assignments/tutorials