Power Electronics notes

Power Electronics

Summary

Power electronics is the application of solid-state electronics to the control and conversion of electric power. It also refers to a subject of research in electronic and electrical engineering which deals with the design, control, computation and integration of nonlinear, time-varying energy-processing electronic systems with fast dynamics.

The first high power electronic devices were mercury-arc valves. In modern systems the conversion is performed with semiconductor switching devices such as diodes, Thyristor and transistors, pioneered by R. D. Middle brook and others beginning in the 1950s. In contrast to electronic systems concerned with transmission and processing of signals and data, in power electronics substantial amounts of electrical energy are processed. An AC/DC converter (rectifier) is the most typical power electronics device found in many consumer electronic devices, e.g. television sets, personal computers, battery chargers, etc. The power range is typically from tens of watts to several hundred watts. In industry a common application is the variable speed drive (VSD) that is used to control an induction motor. The power range of VSDs start from a few hundred watts and end at tens of megawatts.

The power conversion systems can be classified according to the type of the input and output power

· AC to DC (rectifier)

· DC to AC (inverter)

· DC to DC (DC-to-DC converter)

· AC to AC (AC-to-AC converter)

Definitions

POWER ELECTRONICS HANDWRITTEN NOTES(short form)

Power Electronics (Lec. No 01-22)

S.No. Lecture No. Topic

1. 01-03 Introduction to Power Electronics
2. 04-06 Diode,SCR,Triac,GTO
3. 07-09 BJT,MOSFET
4. 10-15 1 Ph. Rectifier,Dual Converter
5. 16-19 3 Ph. Rectifier,HVDC,PWM
6. 20-22 DC-DC Converter

FULL NOTES Power Electronics Notes:

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VTU SYLLABUS WISE PPTS AND PDF NOTES

Unit No

Topic

PDF Notes

IIT Kharagpur note

PPT

1.1 PE Introduction

Power Semiconductor Devices:

1.2 PE Applications

Unit 1

Unit 2

Unit 3

Introduction to semiconductors, Power Electronics, Power semiconductor devices, Control Characteristics. Types of power electronic converters and industrial applications-Drives, Electrolysis, Heating, Welding, Static Compensators, SMPS, HVDC power transmission, Thyristorized tapped changers and Circuit breakers.

Power Transistors: Power BJT’s – switching characteristics, switching limits, base drive control. PowerMOSFET’s and IGBT’s –characteristics, gate drive, di/dt and dv/dt limitations. Isolation of gate and base drives. Simple design of gate and base drives.

Thyristors

Introduction, Two Transistor Model,characteristics-static, and dynamic. di/dt and dv/dt protection thyristor types. Series and parallel operation of Thyristors. Thyristor firing circuits. The simple design of firing circuits using UJT, op-amps, and digital IC’s.

PART-1

PART-2

Unit 4

Unit 5

Commutation Techniques: Introduction. Natural Commutation. Forced commutation- self-commutation, impulse commutation, resonant pulse commutation, and complementary commutation.

Controlled Rectifiers: Introduction. Principle of phase-controlled converter operation. Single-phase semi - converters. Full converters. Three-phase half-wave converters. Three-phase full-wave converters.

1-phase Converters

3-phase Converters

Thyrister based converters-BEST

Unit 6

Unit 7

Choppers: Introduction. Principle of the step-down and step-up chopper with R-L load. Chopper classification. Analysis of impulse commutated thyristor chopper (only qualitative analysis) Performance parameters.

Inverters: Introduction.Principle of operation.Performance parameters.Single-phase bridge. Three-phase inverters. Voltage control of single-phase inverters – single pulse width, multiple pulse width, and sinusoidal pulse width modulation. Current source inverters. Variable D.C. link inverter.