Designing Low-Power Flyback Inductors Using Tiny Toroids (Part 2): Calculating Losses

Focus:

Part 1 of this article described the design of a low-power flyback converter inductor using three stacked T20-26 cores. This part 2 presents further details of the inductor design, specifically the additional design formula required for determining the winding turn length of the unibundle-constructed six-strand winding previously specified. This part also explains how to determine winding resistance and both core and winding power loss. Using this loss information, the effect of the inductor on converter efficiency, based on ideal output power, can be found. Does this design approximately balance core and winding losses to achieve optimum efficiency? If not, which loss dominates and why? The factors at play are explained and some conclusions are drawn about the usefulness of small cores in low-power converter designs.

What you’ll learn:

• How to determine the core and winding losses for a toroidal inductor with unibundle winding

View the Source

Author & Publication:

Dennis Feucht, Innovatia Laboratories, Cayo, Belize, How2Power Today, Jul 15 2019

This article summary appears
in the HOW2POWER Design Guide.

The Design Guide offers
organized access to
hundreds of articles
on dozens of power conversion
and power management topics.

The Design Guide search results
include exclusive summaries
and accurate "how to" analysis
to help you make faster,
more informed decisions.

Search
for more articles