Step-By-Step Process Of Designing Flyback-Converter Coupled Inductors (Part 1): Theory Of Magnetics

Focus:

Flyback converters are popular in offline battery chargers and system housekeeping supplies—or any applications requiring system isolation and low cost. This two-part article explains how to design the flyback converter’s coupled inductor. This part 1 is a review of magnetic theory and foundational design calculations. It defines magnetic parameters and conversion factors; presents equations for inductance, magnetic path length, magnetic force (Ampere’s Law), and flux density (Faraday’s Law); it discusses B-H curves, permeability, inductance and saturation; and explains a method for determining core loss. With regard to windings, it provides equations for determining ac and dc winding losses and whether a winding will fit on a bobbin; and it discusses interleaving of windings.

What you’ll learn:

• How to design a coupled inductor for flyback converters
• How to understand the magnetics theory behind inductor and coupled inductor design

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Author & Publication:

Louis R. Diana, Texas Instruments, Iselin, N.J. , How2Power Today, Mar 15 2023

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