‚Äč

Power Electronics , Switch Mode Power Supplies & Variable Speed Drives

  • Schedule : Online
  • Who is this for: Electrical Engineering Students , Professionals

Duration: 5-8 Hours
Schedule: Online
Level: Beginner
Rs: 29,000

Course Overview

Objectives

  • Demonstrate a sound understanding of howswitchmode power supplies operates
  • Correctly select components and topology for a switchmode power supply
  • Evaluate the performance and stability of a switchmode power supply design
  • Understand howAC Variable Speed Drives (VSDs)work
  • Select the right VSD for a given application
  • Troubleshoot VSDs competently
  • Explain howflux-vector controlworks for drive applications
  • Understand squirrel cage inductionmotors
  • Identify the protection and control system requirements for VSDs
  • Understand the causes ofmotor burnout
  • Effectively dealwith VSD harmonics and EMC/EMI problems

  • Introduction to Power Electronic Circuits & Devices
  • Introduction to Switch mode Power Supplies
  • Switch Mode Power Supply Design 1
  • Switch Mode Power Supply Design 2
  • Switch Mode Power Control & Stability
  • Introduction to Variable Speed Drives
  • Phase Induction Motors
  • Protection of Motors
  • Control System for AC Variable Speed Drives
  • Selection of AC Converters for Variable Speed Drives Applications
  • Electromagnetic Compatibility (EMC)

Topics covered are

  • Introduction
  • Definitions and basic principles
  • Power diodes and thyristors
  • Principles of commutation
  • Power electronic rectifiers
  • Power electronic inverters
  • Gate commutated converters
  • Gate controlled devices – GTO, FCT, GTR, FET, IGBT
  • Block diagram of power electronic circuit
  • Basic principles of PSU circuits
  • Linear and SMPS comparison
  • Comparison of topologies
  • Non-isolated topologies
  • Isolated topologies
  • PWM controller review
  • Speed critical path
  • Choice of topology based on power supply specifications
  • Component selection and design criteria for input section – Input rectifiers – Input filter capacitors
  • High frequency transformer design – Basic transformer theory – Core material and geometry selection – Design of a power transformer for a PWM push-pull converter. – Losses and temperature rise – Winding techniques
  • Output rectification and filtering
  • Power rectifier characteristics
  • Output power inductor design
  • Output filter capacitor design
  • Heat sinking – The thermal equation – Selecting a heatsink – Custom heatsink
  • Transfer functions
  • Criteria for stability
  • Control to output gain
  • Design compensation network
  • Control stability measurements
  • Need for variable speed drives
  • Fundamental principles of speed control
  • Efficiency, torque, inertia, horsepower/power factor
  • Torque-speed curves
  • How the motor produces torque Types of variable speed drives
  • Basic construction and physical configuration
  • Principles of operation and performance
  • Equivalent circuit and fundamental equations
  • Starting, acceleration, running and stopping
  • Power, torque and thermal rating
  • AC frequency converter protection
  • Fault diagnostics
  • Electric motor protection
  • Thermal overload protection – current sensors
  • Thermal overload protection – direct temperature
  • Overall control system
  • Power supply to the control system
  • DC bus charging system
  • VSD control loops (open-loop, closed-loop)
  • Vector control and its applications
  • Current feedback in AC variable speed drives
  • Speed feedback from the motor
  • Basic selection procedure
  • Load ability of converter fed induction motors
  • Operation in the constant power region
  • Nature of the machine load
  • Starting and stopping VSDs (motor braking)
  • How to calculate acceleration torques and times
  • How to select the correct motor and converter for pump and fan loads
  • How to select the correct motor and converter for constant torque loads, such as conveyors
  • Summary of the selection procedure
  • Sources of electromagnetic interference
  • Noise specifications & RFI sources in SMPS
  • Filters for RFI suppression
  • Harmonics on the power supply side of AC converters
  • Effect of harmonic distortion on other connected equipment
  • Methods of reducing the effect of supply side harmonics