Power electronics generally deals with the conversion of electric power. An expert knowledge on the characteristics and operation of power electronic circuits is must for a technical staff to be efficient while working on high power applications. However the major concern in the power electronics area is switching losses during switch ON/OFF which will reduce the efficiency and performance of the system. By involving certain methods, switching losses can be reduced thereby improving the overall efficiency of the system.
Participants can use the skills and gain in-depth knowledge from this work shop on the emerging applications of semiconductor devices that offer higher efficiency.
This course is designed to introduce students to power electronic converters and their recent trends and applications in various fields.
WHO SHOULD COMPLETE THIS COURSE
- Electronic engineers
- Electrical engineers
- System engineers
- Program managers
- Measurement engineers
- Laboratory engineers
- Technical leaders
- System integrators
- Material engineers
- Appliance manufacturing engineers
- Assembly engineers
- Process engineers
- Reliability and quality engineers
- Maintenance engineers
COURSE OUTLINE
INTRODUCTION TO POWER ELECTRONIC CIRCUITS AND DEVICES
- Basic Definitions
- Bistable Switching
- Power Diodes
- Commutation losses of Power Thyristors
- Diode Rectifier AC and DC Current
- Operating principle of Line Commutated Thyristor Rectifier
BASIC PRINCIPLES OF INVERTER AND THYRISTOR
- General purpose Inverter
- Principles of Gate Commutated Inverters
- Modulation Techniques of PWM Inverter
- Switching configurations of 3-phase PWM Inverter
- GTO Thyristors
- Field Controlled Thyristors
- Power Ratings of Bipolar Junction Transistor
- Applications of Field Effect Transistors
- Symbol, Features and Advantages of Insulated Gate Bipolar Transistor
- Future power semiconductor devices development direction
INTRODUCTION TO SWITCH MODE POWER SUPPLIES
- Power supply efficiency
- Dissipative Power Supplies : Series
- Implications of Power Loss
- Advantages of Switching-Mode Power Supplies
- Switching regulator
ISOLATED AND NON-ISOLATED TOPOLOGIES OF CONVERTER
- Operating principle of Buck and Boost Regulator
- Construction of Fly back Converter
- Forward Converters
- Circuit arrangement of Push-Pull Converters
- Operation of Half Bridge and Full Bridge Converter
SWITCH MODE POWER SUPPLY DESIGN 1 AND 2
- Block Diagram of Switch Mode Power Supply
- 115V and 230V operation of Voltage doubler
- Component selection and design criteria
- Input Protective Devices
HIGH FREQUENCY TRANSFORMERS
- Criteria for the selection of magnetic component design
- Ferrite core material for high-frequency power transformers
- Faraday’s law of electromagnetic induction
- Hysteresis loop
- Typical magnetization curve
- Basic transformer theory
WINDING TECHNIQUES
- Planar winding structure
- Meander planar winding
- Co-axial winding structure
- Losses and Temperature rise
- Switch Mode Power Supply block diagram- Output section
SWITCH MODE PSU DESIGN 2
- Output Rectification and Filtering
- Power Rectifier characteristics
- Motorola Rectifier Product Portfolio
- Transient over-voltage suppression
- Switch protection circuits
- Output Power Inductor and Capacitor Design
- Application of Magnetics Molypermalloy Powder ( MMP)
INTRODUCTION TO HEAT-SINKING
- Objective
- Thermal equation
- Path of thermal conductivity
- Thermal resistance
- Heat sink selection
IC PWM CONTROLLERS
- Voltage doubler- 115V Operation
- Use of PWM Controller in SMPS
- Pulse-width modulator block diagram and comparator signals
- A discrete PWM control circuit for a fly-back switching power supply
- Methods of Control
- UC3825 block diagram
- High Speed Complementary Blocks
SWITCH MODE POWER SUPPLY CONTROL AND STABILITY
- Transfer Function of various converters
- Criteria for Stability
- Methods of SMPS control
- Design Compensation Networks
- Loop Stability Measurements
INTRODUCTION TO VARIABLE SPEED DRIVES
- Need for Variable Speed Drives
- Fundamental principles- Definitions
- Torque-Speed curves
- Variable Speed-Energy conservation
- Types of Variable Speed Drives
- Principles of DC and AC Variable Speed Drive
3-PHASE INDUCTION MOTORS
- Introduction
- Construction and operating principles of Induction motors
- Equivalent Circuit of AC Motor
3-PHASE INDUCTION MOTOR PERFORMANCE AND EFFICIENCY
- Performance, Efficiency and Mechanical Output Power
- Torque-Speed curve
- Rating of AC Induction Motors
- Methods of Starting and Selection of Motor
PROTECTION OF AC CONVERTERS
- Input Phase Imbalance
- DC Bus Under-voltage and Over-voltage
- Over- Current Protection
- Output Earth Fault Protection
- Over Temperature Protection
AC MOTOR PROTECTION
- Motor Thermal O/L Protection
- Electric Motor Protection
- Winding Thermostats
- 2-Wire and 3-Wire RTDs
CONTROL SYSTEMS FOR AC VARIABLE SPEED DRIVES
- Overall Control System
- DC bus Pre-charging circuit 1 and 2
- PWM Rectifier for AC Converters
- Variable Speed Drive control loops
- AC Variable Speed Drives
VECTOR CONTROL DRIVES
- Flux-Vector Control
- Sensor less Vector Control Drives
- Field Oriented Flux-Vector Drives
- Hall Effect Sensor
- Incremental Rotary Encoders
SELECTION OF AC CONVERTERS
- Introduction
- Basic Selection Procedure of AC Variable Speed Drive
- Torque Loadability Curve
- Nature of the Machine load
- Variable Torque Loads- Pumps and Fans
- Constant Torque Loads- Conveyors
- Requirements for Starting and Stopping
INTRODUCTION TO TYPES OF BRAKING
- Basic principle of DC Braking
- Dynamic Braking
- Methods of Regenerative Braking
ELECTROMAGNETIC COMPATIBILITY
- Electrical Interference
- Sources of Harmonic currents
- Power Electronic Converters
- Mains current harmonics- DC and AC PWM DRIVES
REDUCTION OF HARMONICS
- Multi Pulse Converters
- Problems with HF PWM Switching
- Motor side filter
REQUIREMENTS OF AC VARIABLE SPEED DRIVE SYSTEM
- De-Rating for Temperature and Altitude
- Main Cable Connections
STOP/START Control of AC drives
- Contactor- Main supply side and motor side
- Mounting in Metal Enclosures
- PLC Control wiring
- General SMPS Troubleshooting approach
