Power Electronics and Switch Mode Power Supply

THE WORKSHOP

Power electronic circuits have revolutionised almost every device that we use today from PC's to TV's, microwave ovens and heavy industrial drives.

Switch Mode Power Supplies (SMPS) have thus become an important part of equipment design in all types of industrial equipment and an understanding of the different types and designs has become essential for reliable operation of complex equipment.

This workshop gives you a fundamental understanding of the basic components that form a SMPS design. You will understand how the selection of components affects the different performance parameters and operation of the SMPS. Typical practical applications of the SMPSs in industry will be discussed.

The concluding section of the workshop gives you the fundamental tools in troubleshooting SMPS designs confidently and effectively.

Even though the focus of the workshop is on the direct application of this technology, you will also gain a thorough understanding of the problems that can be introduced by SMPSs such as harmonics, electrostatic discharge and EMC/EMI problems.

WHAT IS INCLUDED?

  • Receive a certificate of attendance in support of your continuing professional commitment
  • All workshops include the associated hardcopy technical manual
  • Printed workshop handouts
  • Lunch and refreshments
  • Interact and network with workshop attendees and experienced instructors
  • Practical, industry driven content to assist you in your continuing professional development (CPD)
  • Attendees automatically become IDC subscribers and receive exclusive deals and technical content every month

WHO SHOULD ATTEND?

Anyone associated with the use of power electronics and switch mode power supply design techniques in the industrial or automation environment. The workshop will also benefit those working in system design as well as site commissioning, maintenance and troubleshooting.

Typical personnel who would benefit are:

  • Application engineers
  • Component suppliers
  • Electrical and electronic maintenance
  • Instrument for control engineers
  • Product designers
  • Product managers
  • Sales engineers
  • Service technicians
  • Supervisors
  • Technicians

CONTENT SUMMARY

INTRODUCTION

  • Basic principles of PSU circuits
  • Power supply specifications
  • Linear and SMPS comparison
  • SMPS block diagram

TOPOLOGIES

  • Non-isolated topologies
  • Isolated topologies
  • Comparison of topologies
  • Choice of topology based on power supply specifications

IC PWM CONTROLLERS

  • PWM controller review
  • UC3825 block diagram
  • The speed critical path
  • High speed complementary blocks
  • Glue or remaining blocks

THE INPUT SECTION

  • Component selection and design criteria
    • Input rectifiers
    • Input filter capacitors
    • AC or DC input line filters for RFI suppression
  • Input protective devices
    • Inrush current
    • Input transient voltage protection

POWER TRANSISTOR

  • Transistor selection
  • Gate/base drive considerations and circuits
  • Design considerations for safe operating of transistor
    • Transistor losses
    • Ripple current
    • Derating factors
  • Switch protection circuits

HIGH-FREQUENCY TRANSFORMER

  • 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

THE OUTPUT SECTION

  • Output rectification and filtering
  • Power rectifier characteristics
  • Output power inductor design
  • Output filter capacitor design

STABILITY IN SMPS

  • Transfer functions
  • Criteria for stability
  • Control to output gain
  • Design compensation network
  • Loop stability measurements

EMI-RFI CONSIDERATIONS

  • Noise specifications
  • RFI sources in SMPS
  • Filters for RFI suppression

POWER SUPPLY ELECTRICAL SAFETY STANDARDS

  • Construction requirements
    • Spacing requirements
    • Dielectric test
    • Insulation resistance
  • Transformer construction
    • Insulation
    • Dielectric strength
    • Insulation resistance
    • Temperature rating

HEATSINKING

  • The thermal equation
  • Selecting a heatsink
  • Custom heatsink

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