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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}}
+<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>
+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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