ITG Electronics introduces new line of flat wire common mode chokes

08 March 2019

ITG Electronics now offers a range of common footprints as well as custom flat wire common mode chokes (CMC) for high power density and high-frequency switching.Source: ITG ElectronicsSource: ITG Electronics

Flat wire CMCs utilize a flattened, rectangular-cross section copper wire instead of a traditional, circular-cross section wire. At high frequencies, the current penetrates and utilizes less of the volume of the copper wire. This is called the skin effect, because at high frequencies only the "skin" of the wire is utilized. Flat wire maximizes usable wire at high frequencies due to increased surface area.

This advantage has rippling effects through other aspects of the CMC performance. In general, the higher the frequency, the lower the permissible current through a specific wire due to the skin effect, because the current is not utilizing all of the available wire. This means part of the wire is wasted, driving up resistance and heat in addition to lowering the current rating. With a flat wire CMC, these effects are stifled as the current uses the whole wire more efficiently. The altered geometry of the wire also allows for a much lower distributed capacitance at high frequencies. This enables the choke to have higher impedance over a higher range of frequencies, and therefore better performance as a choke.Source: ITG ElectronicsSource: ITG Electronics

Flat wire CMCs not only use current more efficiently, they use space more efficiently. A flat wire can easily exceed window fill and winding density of its round wire counterparts. Changing core geometry from a traditional toroid to the rectangular core can yield savings of up to 50% in volume for the exact same performance. Putting it all together, the result is a high energy density component that takes up less space, uses less power and operates at a higher frequency.

ITG Electronics will be located at Booth 866 for APEC 2019, held March 17 to 21 in Anaheim, California. Also, ITG Field Application Engineer Rickey Cheang will present “Electrical Noise Suppression and Common Mode Choke” on March 20, 11:15 a.m., room 212AB.

For more information, visit http://www.itg-electronics.com/

To contact the author of this article, email engineering360editors@globalspec.com

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