Switchmode Power Supply Handbook, Second Edition

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 IN SWITCHMODE POWER SUPPLIES
Chapter 13: NONINDUCTIVE CURRENT SHUNTS
Chapter 14: CURRENT TRANSFORMERS
Chapter 15: CURRENT PROBES FOR MEASUREMENT PURPOSES
Chapter 16: THERMAL MANAGEMENT IN SWITCHMODE POWER SUPPLIES

4.1 INTRODUCTION

The design of the switchmode transformer, more than any other single factor, will determine the overall efficiency and cost of a modern switchmode supply, Unfortunately, the transformer design process also tends to be the most poorly understood area of switchmode design.

The intention of this section is to throw some light on the major parameters which control high-frequency transformer design. The subject is vast, and many volumes have already been devoted specifically to it. It is beyond the scope of this book to deal with more than some general aspects, but these are covered in sufficient detail to allow the production of working prototypes which will not be too far from an optimum design.

Expert transformer engineers will already be familiar with the many volumes available on the subject, and will be using one of the more sophisticated core geometry, area product,...

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