EMC tutorials - The FLUX BAND

#122 In this video I look at a low cost last minute solution to shielding - the flux band. Its a form of magnetic field shielding that can provide quite a bit of emissions reduction but it can be implemented without having a major impact in design.
More on the topic:
Magnetic field probes: • EMC debugging - Near f...
Magnetic field shielding: • EMC tutorials - Magnet...
Further reading:
www.st.com/content/ccc/resour...
belfuse.com/resources/whitepa...
emcfastpass.com/wp-content/up...
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[@pepperjack8]

Bless this man, I would recommends his videos to anyone who wants to learn electronics and electrical circuits. I have degree in electrical engineering and I have been working for almost 30 years. Please subscribe and that is the least thing you can do.

[@paulpaulzadeh6172]

very great , Best teaching method , greeting from Sweden

[@primateinterfacetechnologi6220]

I love Sweden: I've never been there- but as a literate (and at the moment apparently a little bit drunk and stoned- but I meant to do that... or those) individual, who is not a xenophobe (more of a musician-anthropologist-geologist-sociologist), Sweden does at least on the surface of it... appear to be one of the best countries in the world... for the regular citizens therein, that is. of course, I welcome enlightenment to the reality or specifics of this... whatever it or they may be. yeah... i live in the "good old U.S of "sorry world: we didn't all vote for him" A". despite how Americans tend to boast (braggarts that we are), we on average are a bunch of ignorant, arrogant, anti-science (mired in religious Dogma) nitwits. a "nit" is a louse egg. "wit" comes from the old English "witt" pertaining to intelligence or understanding or some such... in the case we're interested. get ready: I might have to show up and ask for asylum soon... though honestly, I'll probably wind up in Mexico... or Canada, but probably Mexico: I don't think I know anybody in Canada... please wish me luck, if you can afford to. peace be upon you, sir... from the burnt-out remains of Northern California, area code- third planet from our Star = planet "Earth". you can't miss it: the blue one with all the hydrogen... and oxygen. It's a long way to the next watering hole. peace... and "love is the way..."

[@vitorhugome]

Hello from Brazil. Thanks for sharing your knowledge.

[@johnwest7993]

Your videos have made me a better tech. Thank you.

[@xltrader100]

Thanks for this very clear description. I've been using these things for decades! without really understanding why they work. Now I do.

[@halisidrysdale]

Great presentation, thank you yet again!

[@sanjayj2695]

Very well understood because of your practical approach.Thank you.

[@ngifsalame4546]

Your videos are very useful to me , because I am building my own toroidal transformer for power amplifiers,,, great job you are doing educating about EMC 🎉

[@wueric4076]

Good experiment and explanation. Hello from Taiwan.

[@iwbnwif]

Hello, this is by far my favourite KZbin channel!! Really excellent content and presentation. Now binge watching the whole back catalogue ☺️ PLL and balanced modulator are so clearly explained and demonstrated. Finally a great LTspice tutorial (just as I switched to MicroCap!). Thanks 👍

[@FesZElectronics]

Thank you for the kind words! I'm happy you are enjoying the videos!

[@falangistavaleroso9689]

@@FesZElectronics shielding Hello, I have seen your answer about shielding. Here is my case, ex dj and producer in the 90s. Got deep EHS electrosensibility with juditial sentence since 2015, used to live close to a huge militar radar/antenna for submarines and got a huge cell tower in my corner that killed of cancer half a street. Now I live isolated in natural park for birds with 0 EMF. appart of low frequency and hi frequency, I can´t stand magnetical radiation from psus, and got tons of $$ synths as EMS, MOOGs etc. A person as me has symbtoms over 30 nanoteslas and per example the psu of 1 case of my Doepfer modular reaches 19.000! We got 2 options, extract the psus and put them 3 meters away, since the radiation leaves, but this is a mess on 20.000$ as a EMS VCS3, on the best case a clone of the psu should be made to leave the original board untouched and bypass it. etc or wrap the psus with this material designed for it electrocontaminacion.net/pro...-mumetal-mcl61 We are failing at this time but yet got to do more proves, also the side effect in case we could do it is the lack of vents and more heat that can do the already unstable synths be more unstable due to way more heat. Meanwhile we are trying with cheap digital stuff as Nord Lead 2 to avoid damage those vintage jewels. Could you help please?, I am desperate. thanks!

[@lupoal4113]

well done!

[@hardwareful]

Pretty good explanation of what a flux band does. Chances are better to observe some effect when a commercial product that already comes with a flux band in place is modified by removing it. Still not a 100% guarantee that is was really necessary, but probably better chances to find something is off :)

[@parthasingharoy9268]

Thank U Sir .. u make such a informative and knowledge video.

[@bahaaalaagmail]

Great explanation. You sir did a great job. hope you do more of these basic/theory content 😍

[@KamleshGadhvana]

i like this fundamental videos thanks

[@bansci]

Great video, I'm working on low noise SMU designs, with hand wound triple isolated transformers, and will try out adding a flux band next!

[@Yorumcu63]

Great video Tekrar seyret

[@kumar056]

hi, can you help me by explaining why grounding the flux band doesn't make a difference?

[@FesZElectronics]

In my particular case I could not notice a difference, probably because I was mainly measuring magnetic fields. Grounding the flux band should have a more pronounced effect on electric fields.

[@piconano]

Could it be that they are trying to ground the electric field generated around the band? I've always seen these shields grounded and was wondering why. Thanks for another great video.

[@HL65536]

At higher power, would the flux band increase or decrease efficiency?

[@Putzerlblade]

Could you show how to create an IBIS model through measurements?

[@mubbashirshirazi3758]

hello from pakistan very informative very nice videos. please make a detailed videos on how to build a smps with constannt current and constant voltage modes for charging batteries

[@mansionese]

What to do with mains EI laminated trafos? will that copper band work?

[@FesZElectronics]

Some commercial audio amplifiers with laminate transformers do use this. I expect that the same principle is valid there - by adding this band, the intensity of the magnetic fields escaping from the transformer are reduced so there is less noise induced into the circuit.

[@mansionese]

@@FesZElectronics Thanks. 1 more question. *If the copper band connected to Gnd, will it perform better or the same??* as it have "business" with magnetic flux rather than electricity..

[@mansionese]

Nevermind, I rewatch the video, at 12:42 you already answer it.. 😹 But if we use other material like Zinc or Steel, will it improve as it have higher permeability than copper? *Subscribed now!* 👍

[@aerofart]

What effect Does the flux band have on capacitance?

[@FesZElectronics]

I will slightly increase the parallel capacitance of the outer inductor, after all its a large conductive structure placed close to the coils.

[@phamtranduchuy7501]

Hello, very interesting topic. However, I also want to improve EMC/EMI protection during my design stage, how could I done well for a flyback? Is there any method by winding, wire types, ferrite materials or something?

[@FesZElectronics]

I guess the only thing you can do from a construction point of view on a transformer is add a shielding layer inside of it - between primary and secondary. Or, if budget allows, using a toroid. The ferrite material, or how you wind it should not have a big impact on EMI.

[@phamtranduchuy7501]

@@FesZElectronics Could we use toroid core for a flyback?

[@FesZElectronics]

There should be no restriction as long as you can get all the necessary turns and ensure saturation does not occur.

[@mumbaiverve2307]

@@FesZElectronics Doesn't a flyback transformer need an air gap to store the energy ?

[@primateinterfacetechnologi6220]

@@mumbaiverve2307 I haven't a clue... but I myself, have wondered about this subject. additionally, I got drunk... and saw "Mumbai" which is in the "motherland" and thus caught my attention. sounds like you're the lucky one today... my sincere apologies. but on the subject at hand- all I could say is: flyback Transformers do seem to have air gaps, though I couldn't tell you exactly why. hopefully, you will get a response from someone that knows what the hell they're talking about... I wouldn't mind knowing myself... apparently, this stuff is complicated. hahaha. peace be upon you, sir. ps- oh man, if only you could see what the "usually gets it right but not always" "Google Voiceprint" or whatever it's called, happened to say this time... regular polite decorum prevents me from just straight-up telling you what the vulgar words actually were... yet this thing was willing to print it out for me, hahaha. peace. pps- wow, now, whatever algorithm is in charge of this thing, gives me the orange head with the big grin and two hearts for eyes... I've analyzed what I said and have no idea why that would be. perhaps I'm stupid... or perhaps not. if you've made it this far: I salute you. ...and as usual I advocate peace and happiness for all living things; as any sane person would...

[@rogeronslow1498]

It's called a shading ring.

[@axelschmidt6814]

You use copper for magnetic shielding? Isn’t copper diamagnetic (mu_r ~ 1)? Why should the magnet field catched up by this material?

[@FesZElectronics]

The principle is the same as the way Eddy currents get induced into any conductive material. It helps if the material is both conductive and with a permeability above 1 but, the magnetic permeability is not mandatory. Especially at higher frequencies, this parameter becomes less important.

[@pradgadagkar8557]

Not clear