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Switchmode Power Supply Handbook / Edition 3

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Overview

The definitive guide to switchmode power supply design—fully updated

Covering the latest developments and techniques, Switchmode Power Supply Handbook, third edition is a thorough revision of the industry-leading resource for power supply designers. New design methods required for powering small, high-performance electronic devices are presented. Based on the authors' decades of experience, the book is filled with real-world solutions and many nomograms, and features simplified theory and mathematical analysis.

This comprehensive volume explains common requirements for direct operation from the AC line supply and discusses design, theory, and practice. Engineering requirements of switchmode systems and recommendations for active power factor correction are included. This practical guide provides you with a working knowledge of the latest topologies along with step-by-step approaches to component decisions to achieve reliable and cost-effective power supply designs.

Switchmode Power Supply Handbook, third edition covers:

  • Functional requirements of direct off-line switchmode power supplies
  • Power components selection and transformer designs for converter circuits
  • Transformer, choke, and thermal design
  • Input filters, RFI control, snubber circuits, and auxiliary systems
  • Active power factor correction system design
  • Worked examples of would components
  • Examples of fully resonant and quasi-resonant systems
  • A resonant inverter fluorescent ballast
  • An example of high-power phase shift modulated system
  • A new MOSFET resonant inverter drive scheme
  • A single-control, wide-range wave oscillator
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Editorial Reviews

Booknews
Descriptions of techniques in common use today, together with explanations of the latest developments in the field. Addresses how to specify power supply requirements to ensure a system design that is cost-effective and reliable, and presents coverage of such topics as transformer design, choke design, input filters, RFI control, snubber circuits, and thermal design. Includes examples and nomograms. Acidic paper. Annotation c. Book News, Inc., Portland, OR (booknews.com)
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Product Details

  • ISBN-13: 9780071639712
  • Publisher: McGraw-Hill Professional Publishing
  • Publication date: 9/21/2010
  • Edition number: 3
  • Pages: 832
  • Product dimensions: 6.30 (w) x 9.10 (h) x 1.90 (d)

Meet the Author

Keith Billings is a Chartered Electronic Engineer who has specialized in switchmode power supply design and manufacture for 45 years. He owns the consulting company DKB Power Inc. Mr. Billings was lead author on Switching Power Supply Design, Third Edition, filling in for the late Abraham Pressman, and he frequently presents Pressman’s four day course on power supply design and his own one day course on magnetics.

Taylor Morey is a Professor of Electronics Engineering Technology at Conestoga College Institute of Technology and Advanced Learning in Kitchener, Ontario, and design consultant with over 30 years experience in power supplies.

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Read an Excerpt

Chapter 6: Self-Oscillating Flyback Converters

...6.5 Control Circuit

A very simple control circuit is used. The diode of the optical coupler OC1 is in series with a limiting resistor R9 and a shunt regulator U1 (Texas Instruments TL430).

When the reference terminal of the shunt regulator V1 is taken to 2.5 V, current will start to flow into the cathode of V1 via the optocoupler diode, and control action is initiated. The ratio of R12 and R11 is selected for the required output, in this case 12 V.

The optocoupler transistor responds to the output control circuit so as to apply a bias current to R3. A voltage divider network is formed by OC1 and R3 and the base of Q2 as the optocoupler current increases, and so the ramp voltage required across R4, and hence the collector current required to turn Q2 on and Q1 off, will be reduced. (A more complete description of this control circuit is given in Sec. 7.4.)

As Q1 starts to turn off, its collector voltage will go positive, and the collector current will be diverted into the snubber components D2, C5, and R5. The voltage across R5 results in an increase in base drive voltage

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Table of Contents

Part 1: Functions and Requirements Common to Most Direct Off-Line Switchmode Power Supplies; Chapter 1. Common Requirements: An Overview; Chapter 2. AC Powerline Surge Protection; Chapter 3. Electromagnetic Interference (EMI) in Switchmode Power Supplies; Chapter 4. Faraday Screens; Chapter 5. Fuse Selection; Chapter 6. Line Rectification and Capacitor Input Filters for "Direct Off-Line" Switchmode Power Supplies Chapter 7. Inrush Control; Chapter 8. Start-Up Methods; Chapter 9. Soft Start and Low-Voltage Inhibit; Chapter 10. Turn-On Voltage Overshoot Prevention; Chapter 11. Overvoltage Protection; Chapter 12. Undervoltage Protection; Chapter 13. Overload Protection; Chapter 14. Foldback (Reentrant) Output Current Limiting; Chapter 15. Base Drive Requirements for High-Voltage Bipolar Transistors; Chapter 16. Proportional Drive Circuits for Bipolar Transistors; Chapter 17. Antisaturation Techniques for High-Voltage Transistors; Chapter 18. Snubber Networks; Chapter 19. Cross Conduction; Chapter 20. Output Filters; Chapter 21. Power Failure Warning Circuits; Chapter 22. Centering (Adjustment to Center) of Auxiliary Output Voltages on Multiple-Output Converters; Chapter 23. Auxiliary Supply Systems; Chapter 24. Parallel Operation of Voltage: Stabilized Power Supplies; Part 2: Design: Theory and Practice; Chapter 1. Multiple-Output Flyback Switchmode Power Supplies; Chapter 2. Flyback Transformer Design; Chapter 3. Reducing Transistor Switching Stress; Chapter 4. Selecting Power Components for Flyback Converters; Chapter 5. The Diagonal Half-Bridge Flyback Converter;Chapter 6. Self-Oscillating Direct-Off-Line Flyback Converters; Chapter 7. Applying Current-Mode Control to Flyback Converters; Chapter 8. Direct-Off-Line Single-Ended Forward Converters; Chapter 9. Transformer Design for Forward Converters; Chapter 10. Diagonal Half-Bridge Forward Converters; Chapter 11. Transformer Design for Diagonal Half-Bridge Forward Converters; Chapter 12. Half-Bridge Push-Pull Duty-Ratio-Controlled Converters; Chapter 13. Bridge Converters; Chapter 14. Low-Powered Self-Oscillating Auxiliary Converters; Chapter 15. Single-Transformer Two-Transistor Self-Oscillating Converters; Chapter 16. Two-Transformer Self-Oscillating Converters; Chapter 17. The DC-to-DC Transformer Concept; Chapter 18. Multiple-Output Compound Regulating Systems; Chapter 19. Duty-Ratio-Controlled Push-Pull Converters;Chapter 20. DC-to-DC Switching Regulators; Chapter 21. High-Frequency Saturable Reactor Power Regulator (Magnetic Duty Ratio Control); Chapter 22. Constant-Current Power Supplies; Chapter 23. Variable Linear Power Supplies; Chapter 24. Switchmode Variable Power Supplies; Chapter 25. Switchmode Variable Power Supply Transformer Design; Part 3: Applied Design; Chapter 1. Inductors and Chokes in Switchmode Supplies; Chapter 2. High-Current Chokes Using Iron Powder Cores; Chapter 3. Choke Design Using Iron Powder Toroidal Cores; Chapter 4. Switchmode Transformer Design (General Principles); Chapter 5. Optimum 150-W Transformer Design Example Using Nomograms; Chapter 6. Transformer Staircase Saturation; Chapter 7. Flux Doubling; Chapter 8. Stability and Control-Loop Compensation in SMPS; Chapter 9. The Right-Half-Plane Zero; Chapter 10. Current-Mode Control; Chapter 11. Optocouplers; Chapter 12. Ripple Current Ratings for Electrolytic Capacitors; Chapter 13. Noninductive Current Shunts; Chapter 14. Current Transformers; Chapter 15. Current Probes for Measurement Purposes; Chapter 16. Thermal Management; Part 4: Supplementary; Chapter 1. Active Power Factor Correction; Chapter 2. The Merits and Limitations of Hard Switching and Fully Resonant Switchmode Power Supplies; Chapter 3. Quasi-Resonant Switching Converters; Chapter 4. A Fully Resonant Self-Oscillating Current Fed FET Type Sine Wave Inverter; Chapter 5. A Single Control Wide Range Sine Wave Oscillator; Glossary; References; Index

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