Book description
Switching Power Supplies A - Z is the most comprehensive study available of the theoretical and practical aspects of controlling and measuring Electromagnetic Interference in switching power supplies, including input filter instability considerations.
The new edition is thoroughly revised with six completely new chapters, while the existing EMI chapters are expanded to include many more step-by-step numerical examples and key derivations and EMI mitigation techniques. New topics cover the length and breadth of modern switching power conversion techniques, lucidly explained in simple but thorough terms, now with uniquely detailed "wall-reference charts" providing easy access to even complex topics.
- Step-by-step and iterative approach for calculating high-frequency losses in forward converter transformers, including Proximity losses based on Dowell's equations
- Thorough, yet uniquely simple design flow-chart for building DC-DC converters and their magnetic components under typical wide-input supply conditions
- Step-by-step, solved examples for stabilizing control loops of all three major topologies, using either transconductance or conventional operational amplifiers, and either current-mode or voltage-mode control
Table of contents
- Cover Image
- Contents
- Title
- Copyright
- Preface
- Acknowledgments
- Chapter 1. The Principles of Switching Power Conversion
-
Chapter 2. DC–DC Converter Design and Magnetics
- DC Transfer Functions
- The DC Level and the “Swing” of the Inductor Current Waveform
- Defining the AC, DC, and Peak Currents
- Understanding the AC, DC, and Peak Currents
- Defining the “Worst-Case” Input Voltage
- The Current Ripple Ratio “r”
- Relating r to the Inductance
- The Optimum Value of r
- Do We Mean Inductor? or Inductance?
- How Inductance and Inductor Size Depend on Load Current
- How Vendors Specify the Current Rating of an Off-the-shelf Inductor and How to Select It
- What Is the Inductor Current Rating We Need to Consider for a Given Application?
- The Spread and Tolerance of the Current Limit
- Worked Example (1)
- Worked Examples (2, 3, and 4)
- Worked Example (5) — When Not to Increase the Number of Turns
- Worked Example (6) — Characterizing an Off-the-Shelf Inductor in a Specific Application
- Calculating “Other” Worst-case Stresses and their Selection Criteria
- Chapter 3. Off-Line Converter Design and Magnetics
- Chapter 4. The Topology FAQ
- Chapter 5. Advanced Magnetics
- Chapter 6. Component Ratings, Stresses, Reliability, and Life
-
Chapter 7. Optimal Power Components Selection
- Overview
- The Key Stresses in Power Converters
- Waveforms and Peak Voltage Stresses for Different Topologies
- The Importance of RMS and Average Currents
- Calculation of RMS and Average Currents for Diode, FET, and Inductor
- Calculation of RMS and Average Currents for Capacitors
- The Stress Spiders
- Stress Reduction in AC–DC Converters
- RCD Clamps versus RCD Snubbers
-
Chapter 8. Conduction and Switching Losses
- Switching a Resistive Load
- Switching an Inductive Load
- Switching Losses and Conduction Loss
- A Simplified Model of the MOSFET for Studying Inductive Switching Losses
- The Parasitic Capacitances Expressed in an Alternate System
- Gate Threshold Voltage
- The Turn-On Transition
- The Turn-Off Transition
- Gate Charge Factors
- Worked Example
- Applying the Switching Loss Analysis to Switching Topologies
- Worst-Case Input Voltage for Switching Losses
- How Switching Losses Vary with the Parasitic Capacitances
- Optimizing Driver Capability vis-à-vis MOSFET Characteristics
-
Chapter 9. Discovering New Topologies
- Part 1: Fixed-Frequency Synchronous Buck Topology
- Part 2: Fixed-Frequency Synchronous Boost Topology
- Part 3: Current-Sensing Categories and General Techniques
- Part 4: The Four-Switch Buck-Boost
- Part 5: Auxiliary Rails and Composite Topologies
- Part 6: Configurations and “Topology Morphology”
- Part 7: Other Topologies and Techniques
- Chapter 10. Printed Circuit Board Layout
- Chapter 11. Thermal Management
-
Chapter 12. Feedback Loop Analysis and Stability
- Transfer Functions, Time Constant, and the Forcing Function
- Understanding “e” and Plotting Curves on Log Scales
- Flashback: Complex Representation
- Repetitive and Nonrepetitive Stimuli: Time Domain and Frequency Domain Analyses
- The s-Plane
- Laplace Transform Method
- Disturbances and the Role of Feedback
- Transfer Function of the RC Filter, Gain, and the Bode Plot
- The Integrator Op-amp (“Pole-at-Zero” Filter)
- Mathematics in the Log-Plane
- Transfer Function of the Post-LC Filter
- Summary of Transfer Functions of Passive Filters
- Poles and Zeros
- “Interactions” of Poles and Zeros
- Closed and Open-Loop Gain
- The Voltage Divider
- Pulse-Width Modulator Transfer Function
- Voltage (Line) Feedforward
- Power Stage Transfer Function
- Plant Transfer Functions of All the Topologies
- Feedback-Stage Transfer Functions
- Closing the Loop
- Criteria and Strategy for Ensuring Loop Stability
- Plotting the Open-Loop Gain for the Three Topologies
- The ESR-Zero
- High-Frequency Pole
- Designing a Type 3 Op-Amp Compensation Network
- Optimizing the Feedback Loop
- Input Ripple Rejection
- Load Transients
- Type 1 and Type 2 Compensations
- Transconductance Op-Amp Compensation
- Simpler Transconductance Op-Amp Compensation
- Compensating with Current-Mode Control
- Chapter 13. Advanced Topics
- Chapter 14. The Front End of AC–DC Power Supplies
- Chapter 15. EMI Standards and Measurements
- Chapter 16. Practical EMI Line Filters and Noise Sources in Power Supplies
- Chapter 17. Fixing EMI Across the Board and Input Filter Instability
- Chapter 18. The Math Behind the Electromagnetic Puzzle
-
Chapter 19. Solved Examples
- Part 1: FET Selection
- Part 2: Conduction Losses in the FETs
- Part 3: FET Switching Losses
- Part 4: Inductor Loss
- Part 5: Input Capacitor Selection and Loss
- Part 6: Output Capacitor Selection and Loss
- Part 7: Total Losses and Efficiency Estimate
- Part 8: Junction Temperature Estimates
- Part 9: Control Loop Design
- Appendix
- Index
Product information
- Title: Switching Power Supplies A - Z, 2nd Edition
- Author(s):
- Release date: May 2012
- Publisher(s): Newnes
- ISBN: 9780123865342
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