Common-mode filtering

[@stefano.a]

This is the best explanation that I found so far. Thank you!

[@koodreitz]

Thank you so much for your kind feedback Stefano!

[@TymexComputing]

Very good and detailed explanation! I like the natural smiles also :)

[@marcosferreiracardoso9680]

An incredibly good explanation!

[@ife.tugraz]

We are glad you like it :)

[@AabhusanAryalOfficial]

Great video! Never stop smiling ;)

[@ife.tugraz]

Thank you, we are very pleased.

[@mrechbreger]

Danke für die Videos!

[@Patriot-qp9ui]

In your schematic shown at 2:34 min of this film, current entering Lcm will create opposite magnetic fields , what in effect they will cancel each other, so what is the reason for Lcm?

[@audiokees4045]

I did make a resonance smps for audio, a noise of just 390 mV did rise mine distortion of the amp from 0,.002 to 0.12 this noise is as such bad, making a transformer without the intrinsic capacitance is impossible, so using a second primary winding who a capacitor to primary ground do flip the fase 180 degree and cancel this noise. Maybe a good idea, for flyback it works. But I can also use your approach on the outputs, using a common mode filter, I did try and it drops from 390 mV to less then 7 mv.

[@Martin-lq3up]

Hello, I have a question. Regarding the ferrite bead mentioned at the end, it's usually found in power cords. However, since power wires have both positive and negative polarities, wouldn't the current flow in two different directions on these two wires? In that case, how does the choke still work?

[@julianopimentel3324]

Very good - thanks for sharing!

[@ife.tugraz]

Thank you!

[@Yorumcu63]

Nice Video Thank you for video

[@danielchatrie6614]

As for as my experience with Switch mode power supply the filter inductance is very important for in rush current limiting cause if the inductance is to small more current will draw from the mains into the transformer and built up as heat wasting the current. And burning up the winding because if the core is rated for 6 amp and the chock is inductance is small 9 amp will drawn from the mains and 3 amps.is wasted as heat in the winding so the chock play many rolls in power supply

[@stiven_ph8656]

Are emi filter inductor can help audio quality i mean speaker become quieter?

[@rpt170]

Are the chasis and power supply ground at different potential? If so then why?

[@SC-lj6zr]

The problem is common mode noise current feeding in choke at the same time. Flux will build up in the loop. Possibly reached flux saturation region and then inductance will drop to zero. Is main inductance or leakage inductance to determine flux saturation point?

[@civildiscourse2000]

As an electronics technologist whose course material never covered this subject specifically, I always assumed that I would be able to figure this out if I sat down to think about it. I can now continue to make this assumption. 😁

[@EngineerAnandu]

Good.

[@fase144]

This guy talks passionately

[@josepeixoto3384]

good for those who already know it; i did not get it, i mean, i STILL can't design my filter (for 100 amperes); better if you showed 1 or 2 examples; practical ones edit: what is common-mode???