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info (at) bcarsten.com

Tel: (541) 745-3935
Fax: (541) 745-3923

6410 NW Sisters Pl.
Corvallis, OR 97330

SEMINAR1
DESIGN CONSIDERATIONS FOR HIGH FREQUENCY LINEAR MAGNETICS

This course covers many important aspects of high frequency magnetics design that are not discussed in the textbooks. Some fundamentals are reviewed to establish a firm foundation for advanced design, but a basic understanding of transformers and inductors is assumed. New material in this seminar explores the relative merits of various low profile (a.k.a. "planar") transformer geometries for medium and high power-frequency applications. It is also shown that most transformers would benefit from "more core and less winding" at all frequencies and power levels. (High frequency conductor losses are covered in a separate seminar.) Topics include:

THE BASICS

  • Ferromagnetic materials
  • Misunderstandings about the B-H loop
  • Energy storage in magnetic fields

INDUCTORS

  • Maximizing energy storage
  • Importance of winding capacitance in HF filtering
  • Leakage fields, and effects on EMI
  • The toroidal core "no external field" myth

TRANSFORMERS

  • Leakage Inductance: Myths and Misunderstandings; Calculation, Measurement, and effects on winding voltages and currents
  • High leakage transformers, and leakage field EMI
  • The "pi" and "T" models of transformer inductances
  • Calculation and measurement of winding capacitances
  • Faraday shields for reduced common mode conducted EMI
  • Flux straps for reduced magnetic leakage fields
  • Toroidal. Planar and coaxial transformer myths

OPTIMIZATION, SIZE AND SHAPE EFFECTS

  • Scaling laws and size effects
  • Shape and core-winding geometry effects
  • Optimizing magnetics in various power-frequency domains

COOLING AND THERMAL MANAGEMENT TECHNIQUES

  • Conductive cooling through the core
  • Heat extraction through a winding
  • Advantages of "open" designs with cooling channels

DESIGN GUIDELINES FOR VARIOUS MAGNTIC DEVICE TYPES

  • Power transformers
  • Pulse and ac current transformers
  • Signal level pulse transformers
  • High ripple and ac inductors
  • Second stage filter inductors
  • Common (longitudinal) mode inductors

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Last updated Saturday, November 9, 2002. Website design and development by Josie Nutter.
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