DI05000171 · Semester 5 · 5G scheme
Power Electronics Converters
Notes and solutions following the Gujarat Technological University (GTU) syllabus for DI05000171. Independent material — not issued by the university.
Materials
Complete Book
The whole syllabus, unit by unit, written for the exam.
Complete Book
140 pages
Premium Preview · 12 pages
Syllabus units
Unit 1: Power Semiconductor Devices & Driver circuits
- Structure, working and static characteristics of MOSFET, IGBT, SCR, Concept of wide band gap (WBG) semiconductor materials: GaN, SiC.
- Realization of ideal and practical power electronics switches
- Protection of power semiconductor devices (Over voltage, short circuit current, dv/dt, di/dt etc.), cooling & heatsink for power semiconductor devices, Design of Snubber circuit
- Commutation of SCR
- Gate & Base Driver circuits: requirements and preliminary design considerations, Driver circuit with transformer isolation and opto isolation with examples.
- Function of freewheel diode.
- Ratings and interpretation of datasheet of power semiconductor devices
- Basics of Harmonics & its effects on performance
Unit 2: Line Commutated Converters
- Single phase half wave& full wave bridge rectifier with R, RL and RLE load
- Working Principle and Analysis of Three phase half wave and full wave uncontrolled rectifierwith RLoad.
- Single phase full wavecontrolled rectifier with R & RL load and its examples
- Principle of AC voltage controller: Integral cycle control and Phase control
- Single phase Integral control and Phase control AC Voltage controller with R load.
Unit 3: DC - DCSwitched Mode Converters
- Chopper: Block schematic, SPDT representation & realization using semiconductor switches
- DC steady state principles: volt-sec balance, amp-sec balance
- Design of Buck, Boost and Buck-Boost converters: Topology, Working, modes of operation, Derivation of L and C and its examples
- Selection of Power switches: Device selection, Electrical stress rating, Thermal stress rating
- Isolated DC - DC converters: Forward converter, Flyback converter
Unit 4: INVERTERS
- Basic working principle of Inverter
- Terminology: HF, THD, DF, LOH etc.
- Working & Design of single-phasehalf bridge and full bridge voltage source inverters with R & RL load with examples
- Voltage control in single phase inverters: single pulse, multiple pulse and Sinusoidal PWM control
- Unipolar and Bipolar PWM switching techniques on single phase full bridge inverters
- Construction and working of three phase inverters: 120˚ mode and 180˚ mode.
Unit 5: Power Electronics Applications
- Soft starter of three phase induction motors
- Variable voltage Variable frequency control of three phase I.M.
- Electronics fan regulator, Induction heaters, UPS, SMPS
- Simple battery charger & automatic battery charger
- EV car charger
- Active power factor correction (APFC) using TSC
About this course
Power Electronics Converters is a core subject that deals with efficient conversion and control of electrical power using semiconductor devices. It provides knowledge of various converters such as rectifiers, choppers, and inverters, which are widely used in industrial and domestic applications. The subject helps students understand switching techniques, control methods, and performance parameters of power electronic systems. It also introduces modern devices like MOSFETs, IGBTs, and wide band gap materials used in high-efficiency applications. The concepts learned are essential for applications such as motor drives, renewable energy systems, UPS, SMPS, and electric vehicle chargers. This subject builds a strong foundation for design, analysis, and troubleshooting of power electronic circuits. It also enhances practical and industry-oriented skills required for electrical engineering professionals.