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flux_band [2019/06/03 18:29]
flux_band [2020/12/06 23:25] (current)
stan_zurek [Definition]
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 +====== Flux band ======
 +
 +|< 100% >|
 +| //[[user/Stan Zurek]], Flux band, [[http://Encyclopedia-Magnetica.com|Encyclopedia-Magnetica.com]], {accessed @YEAR@-@MONTH@-@DAY@}// |
 +| //[[/wiki/reviewed]] by [[user/Jeanete Leicht]], 2013-01-25// |
 +
 +
 +
 +**Flux band** - a conductive loop, effectively a [[short-circuited turn]], wrapped closely around the outside of an [[electronic transformer]] to reduce the effect of the [[flux fringing|fringing]], [[leakage flux|leakage]] and [[stray flux]], which might cause [[electromagnetic interference]] to the surrounding devices and circuits.
 +[([[http://www.dianyuan.com/bbs/u/66/585911214665446.pdf|Power Integrations Inc., TOPSwitch (R) flyback transformer construction guide, Application note AN-18, July 1996, {accessed 28 Nov 2012}]])]
 +
 +{{page>insert/paypal}}
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 +<box 40% right #f0f0f0>
 +Flux band around a [[ferrite]] [[transformer]]
 +[[file/transformer_flux_band_magnetica.jpg|{{transformer_flux_band_magnetica.jpg}}]]
 +{{page>insert/by_SZ}}
 +</box>
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 +The flux band couples electromagnetically to the stray flux, generates opposing currents and partially reduces [[radiated emission|radiated emissions]]. But because it is located on the outside of the returning [[limb|limbs]] of the magnetic core it does not impact on the main operation of the transformer. 
 +
 +The flux band can be connected to ground or one of the windings (e.g. primary) to help in reduction of electrostatically coupled interference. 
 +
 +The presence of a conductive flux band might compromise the [[creepage and clearance distance]]s, which are a safety related issue. Hence the correct dimensions must be designed to take those factors into account.
 +
 +===== See also =====
 +  *[[Stray flux]]
 +
 +===== References =====
 +~~REFNOTES~~
 +
 +{{tag>EMC Windings Counter}}
  

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