In this app note FRENETIC focus on the coil former and its importance.

We have talked before about the importance of components such as the core and wire, but in this document we will focus on the coil former.

A coil former plays a big role in a magnetic component, it is where the wire is winded; hence the bobbin determines the working space, how will the connections go and the heat flow.

Standard bobbins not always have the desired characteristic for a specific design, so we optimize them for each case.


In FRENETIC we adjust the coil former to our needs with fast prototypes that can be manufactured later.

We make small changes in standard coil formers and 3D-print them to make tests as fast as our customers needs:

  • Longer bobbins for many stacks.
  • Special coil formers for a specific magnetic component.
  • Better heat evacuation.
  • Thinner bobbins mean bigger winding window.
  • Easier to wind designs.

All the customized coil formers are introduced in our AI-based technology to be used in future designs.


All the customized coil formers are introduced in Frenetic to be used in future designs. We test all the coil formers, included the customized, to know their temperature behavior, parasitics and mechanical parameters.

 Example: The temperature of the wire of the inductor of Figure 3 is measured with 22 A of DC.

The red line shows the temperature evolution in a standard coil former, while the blue shows the evolution in a special coil former designed to reduce heat.

The temperature difference between the outside layer of the two coil formers grows over time, reaching a difference of 10ÂșC after 390 seconds.

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