Squeeze More Performance Out of Toroidal Inductors

Focus:

A new technique for manufacturing toroidal inductors increases the number of turns that can be achieved in a single winding. This capability enables greater inductance for a single winding on a given core size, approximately three times the inductance of conventional manufacturing techniques. By packing more inductance into a single winding, designers can avoid use of multiple windings, which significantly increase parasitic capacitances as well as the need to use larger core sizes. The technique developed by Actown Electrocoil uses wire that is formed at sequential intervals so that the windings are narrower and rectangular where they wrap around the inner diameter of the core, but circular where they wrap around the outer diameter of the core. This technique enables about 70% more turns than a toroid wound with conventional, circular wire.

What you’ll learn:

• How to increase the inductance of a toroidal inductor with a single winding
• How to reduce the parasitic capacitance of toroidal inductors by changing from multiple windings to a single winding
• How to shrink toroidal inductor size

Notes:

This article doesn't describe the actual techniques used to form the wire.

View the Source

Author & Publication:

Mark Seitz, Product Manager, and Michael Roeber, Design Engineer, Actown Electrocoil, Spring Grove, Ill., Power Electronics Technology, Oct 01 2005

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