Single-Bundle Windings Make It Easier To Build Custom Magnetics In-House
by Dennis Feucht, Innovatia Laboratories, Cayo, Belize, How2Power Today, Mar 14 2014
Focus:
Two decades or more ago, America had numerous magnetics parts suppliers who were willing to
provide free samples for prototype builds. Nowadays, the parts are built overseas and the only
suppliers left in N. America are those with price-insensitive markets or those making
standardized parts. One solution to the custom magnetics supply problem is to build your own
transformers and coupled inductors (transductors). If that notion sends a red flag up in your
mind, this article might offer some relief. The use of single-bundle construction with
multifilar windings (as opposed to sequential windings) can simplify transformer and coupled
inductor construction so that even those without assembly experience could build these parts.
At the same time, this method of construction has electrical advantages such as lower parasitic
capacitive currents and more uniform winding temperature as explained here. Required tradeoffs
such as the loss of turns ratio precision and more work in bundle construction are discussed.
Construction techniques are described and component examples are presented.
What you’ll learn:
- How to simplify construction of custom transformers and coupled inductors using single-bundle construction with multifilar windings
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