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Step-By-Step Process Of Designing Flyback-Converter Coupled Inductors (Part 2): A Practical Example

by Louis R. Diana, Texas Instruments, Iselin, N.J. , How2Power Today, Apr 14 2023

Focus:
Part 1 of this two-part article provided a review of magnetic theory and foundational design calculations for designing a coupled inductor magnetic for a flyback converter. This part 2 shows how to apply these calculations in an example design of a 10-W quasi- resonant flyback. Specifically, it calculates inductance, wire gauge and ac-dc losses, flux density, core and bobbin fill factor, and inductance rolloff; selects a core material; and shows how to achieve good coupling by layering the primary and secondary windings on a bobbin. The article begins by presenting a design flow diagram that defines the order of steps in designing a coupled inductor and which steps are iterative.

What you’ll learn:

How to design a coupled inductor for flyback converters
How to calculate inductance, wire gauge and ac-dc losses, flux density, core and bobbin fill factor, and inductance rolloff for a power inductor

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