EMI FILTER DESIGN GUIDE | EMI INPUT FILTER DESIGN | DESIGN GUIDE | ELECTROMAGNETIC INTERFERENCE

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This is a design guide for an EMI input filter. EMI input filters usually go on the input of power supplies because they generate a lot of electromagnetic noise. The main components are x-capacitors, y-capacitors, common-mode chokes, filtering inductors, and filtering capacitors.

[@masterchief4125]

This channel is going to huge
Keep up the good work!

[@sanatghosh9278]

It is worth attending, sir. How to calculate common Mode Choke inductance? Please add it.

[@baneknight7402]

Great guide, keep it up

[@RGBEngineering]

Thank you!

[@rafaelgonzalez6158]

Thanks for the video. Unless you are using a PFC on the power stage, there is no way your power factor is 0.96. Power factor is terrible without PFC, I would say in the range of 0.5 and I think I am still being optimistic.

[@mohdjabir7163]

I m a big fan of your teaching sir please make a video on how to select NTC and MOV , PTC

[@aatmanp]

Hey there, one question regarding the output power being 120W. On what basis did you consider it? Also, is it the output power of the EMI filter alone, or the entire system you are using the filter for? Great video btw! Thanks a lot!!!!!

[@RGBEngineering]

So the output power was just an example I used. The important thing is to make sure your filter can handle the amount of current (both RMS and peak).

[@rahulkumarjkb8442]

While calculating x cap in equ 35VAR = 265 (I) but power Q=VI Sinefi

[@AbhishekSingh-qz3fx]

Awesome!

[@muhammadyakubjony9316]

Please, if you can explain why the design includes X-Cap, Y-Cap and CM Choke twice?
And a video about selecting SPDs (MOV, GDT etc.) with calculation process would be appreciated.

[@ChinaFrSe]

I have the same question

[@omaraaziz6706]

Thank you. Much appreciated.

[@zuhaibchoudhary4635]

In inductor selection where does 2 go??
Why we assumed cap :(

[@Telectronics]

Hey this video is brilliant for an engineering student like me who knows a lot theory but not always how to jump into the real design. I have a suggestion from my side but I think it will also help others If you can give a guide over what core material is the best for my filtering application because you can choose so many even ferrite ones. With my I don´t mean my application I mean more like you choose an arbitratry frequency and say something about it. So like other than saturation can you overheat your core with a too high filtering frequency as example ?!

[@RGBEngineering]

Thank you so much! I will make more videos on this topic, and be sure to include information on ferrite cores.

[@Telectronics]

Thank you very much ! I just found your channel and I already subscribed because you have a lot of good videos as I see ! Keep it going :)

[@sajjadkarami872]

nice

[@howardhiggins9641]

How important is it that the capacitor pairs C6, C11 and then C47, C49 be MATCHED in value ? I have heard that they should be VERY close.
I also know that random parts, even in the same batch, can be "off" just to normal variations. So if it is important, how close should they be in percent ?
Thanks.

[@RGBEngineering]

Just make sure they are the same nominal value (they need to be able to filter the same noise signals).
Tolerances on parts should be taken into account when considering the pass criteria for a product's EMI test.
For example, setting a 3db margin would put you several standard deviations within passing, so that might be the margin amount you use.
At the end of the day, as long as your product passes EMI, that is all that matters.

[@davidlowkz]

Bro THANK YOU

[@stiven_ph8656]

Are emi filter or inductor can reduce noise on audio signal?

[@RGBEngineering]

Yes, it would work for that as well.

[@stiven_ph8656]

@@RGBEngineering but is there any downside?

[@hoofheartedicemelted296]

Does any of your videos include the formula for calculating flyback? Apologies if this is an obvious question.

[@RGBEngineering]

I am planning a whole series on power electronics. I will include some videos on the flyback converter :)

[@hoofheartedicemelted296]

@@RGBEngineering Thank you sir. Is there an option to contribute to your work sir? A patreon?

[@aneesrahman1287]

Where is power fqctor calculating video?

[@RGBEngineering]

th-cam.com/video/8IzmtrsVaOY/w-d-xo.html

[@maitreyeepatwardhan6829]

@@RGBEngineering Hi, this video doesn't seem to cover the power factor calculation part, can you share the link of your video which covers it?

[@RusAdriian]

@@RGBEngineering yeap that s not the video

[@RusAdriian]

Man u should liked my comment 3 years ago . I already finished my degree :))

[@Ramkumar-le4me]

That inductor calculation is for pi filter or common mode choke??

[@RGBEngineering]

Pi filter. I used a graph to select the common mode choke.

[@Omnipotentwarrior]

Sir u got Y cap value 500pF but u add different values in the schematic diagram. can you tell me how come that value added. same in the case of X cap.please explain.

[@RGBEngineering]

Those were the minimum values that I calculated for. I then chose values that were above the minimum required value.

[@Omnipotentwarrior]

@@RGBEngineering Thankyou sir.

[@lintaubuo2019]

​@@RGBEngineeringsir why do you need a 2200pf capacitor when you only calculate 500pf is there any factor that influences

[@dradeelarif1469]

Xc to be 530KR not 5.3mR

[@user-ug5lm6us3b]

L = 337uH --> 0.0337uH

[@jboy4real]

Good teaching but you need to make your writing legible

[@mohdjabir7163]

I m a big fan of your teaching sir please make a video on how to select NTC and MOV , PTC