How to wind a Common Mode choke - Winding an Inductor for an EMI filter
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- čas přidán 6. 09. 2024
- In this video 'How to wind a Common Mode choke -Winding and Inductor' I will show how to wind a Common-Mode choke. We will use a toroid core and wind some wire onto it to make a CM-Choke. #CM Choke, #CM Inductor, #Winding an Inductor, #Winding a Common Mode choke, #Winding a common mode inductor, #CM Inductor
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Thank u, Mr. Kiss Analog.
Thanks so much for your feedback!
Thanks Eddie. It was a great presentation. You said this video was coming. A man of your word!
Thanks so much Joey! I appreciate you!
@Kiss Analog I appreciate you too Eddie. Hahahaha ya nut
Thank you very much for this good information. this video was very helpful for me. so how to wind differential mode choke
Great question! I will show this soon;)
It's probably a bit more advanced topic, but do you have a video covering the frequency response of a common mode choke? And maybe the possibility of making it more _"broadband"_ by putting two cores (made of different materials) together and then winding your turns through *BOTH* of them?
Thank you for asking about this. I will do a video soon to talk about this. I have used 2 cores before (that each have different characteristics). This would be a great topic - thanks!
Thank you for another helpful video. One comment follows. At around 19:20 minutes you say that common mode signals result in magnetic field cancellation in the core. I think it may be the opposite. If the fields were to cancel the inductance of the unit would be zero and hence it would not provide any impedance (i.e., choking action). If I assume the same magnitude of current enters the two lower wires (at time 19:22) and then use the right hand rule to determine the direction of the resulting fluxes I believe they are both counter-clockwise and hence add together. - Cheers - Jim
Thanks for the feedback Jim! What I meant was that for normal mode - where current is flowing thru the circuit - the fields cancel. But, for Common-mode current flow - the field builds as both currents are circulating in the same direction.
Lots of good info, as usual, but it leaves me with 1,000,000 questions. Why three X caps? Why are the Y caps on the load side? Aren't they usually on the line side? Is the resistor there to discharge the caps when power is removed? Since the common mode choke on the demo board has deliberate leakage inductance, why is a separate differential mode inductor needed? How are the values of the resistor and the inductors and capacitors chosen? How do you insure that an EMI filter meets the Middlebrook stability criteria? How do you measure or calculate the output impedance of an EMI filter and the input impedance of a power supply? How common is it to use custom inductors vs. off-the-shelf ones? How would you simulate an EMI filter in Micro-Cap? Lots more topics to cover in future videos. And those are just the questions off the top of my head! And how does the value of the bulk capacitor affect the operation of the filter? Does it need to be taken into consideration? O.K., O.K., enough for now . . .
Thanks for the great questions! I will place parts in the EMI filter as place holders and not populate all of them - unless needed. The Y caps on the load side give a place for CM noise from the load to go instead of out to the line. But, placing them right at the input (line side) often works great too;) I'll walk through a design to show the steps in a step-by-step method. The bulk capacitor can cause large current spikes if too large.
Really nice presentation Eddie, thanks.
Thanks so much!
this is an awesome video about ferrites and very useful practically speaking i must say i have learned a lot from it. thanks so much
actually i have here an old rusted isolation transformer. where a lot of the laminations seems like they have had water ingress and so i am wondering if the performance of the magnetics has become compromised as a consequence of that.... hoping to try to teat how well it does under a load. but also maybe can passsively measure the inductance of the coils on my de5000 lcr mater. to see how much it deviates from spec. i am hoping your video will perhaps help me to know what to look out for. i suppose its applicable where you mentioned capacity before saturation. if too many laminations are compromised then maybe this capacity is reduced and then it saturates sooner at a lower current?
It sounds like you have a good understanding of this;) It is interesting what rust would do. It is possible that the worst thing that you experience is just vibrations of the laminations and otherwise they work just fine.
Coffe is life!
Wow - you just made my month!!! Thank you so much!!
Neat video, thank you. Your resistor is similar to myn. I should have been a doctor. I use templets.
Thanks for your feedback! I think we should both have been doctors - but I've got a problem with blood and guts - eeks!
I play with LC circuitry to filter switch mode noise from power supply to DAC
It makes a big improvement on sound quality for virtually nothing. It’s quite amazing on scope how effective it can be .(just remember the fly back diode)
Thanks for sharing this! Yes if the DAC can have higher resolution by lowering the noise floor around the DAC. This can be measured.
Great video!😀
Thanks so much!
Nice vedio sir👌.
But can you plz suggest about twisted CMC choke is nessary for CMC choke in DIY.
Thank you for the great video. I found it to be very informative.
That's great! Thanks so much!
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Great video. Do you also wind your own toroidal transformers? If you are going into more capacitor testing on the LCR can you also show more about testing at different frequencies? Thanks.
Thanks for asking! I have wound all types of cores. I can show more measurements and when to use different frequencies to get the results that you want.
I'm looking for a way to get rid of the pesky noise that comes out on the power leads of a my DC switchmode bench power supply into my connected circuitry. Would one of these chokes reduce/eliminate the noise if place on the output of the supply. If so which way do I make/orient the turns. Maybe add a capacitor in there also? Capacitors only across the output have been ineffective.
Thanks for asking! I've been meaning to get to that video;) I'll do one very soon.
That would be great.because it a real issue with these supplies especially if you want clean bench power. Not that I couldn't build a linear supply. But the switchers are so versatile with low cost these days.
I'll subscribe in wait for your solution to the problem.
Thanks
@@KissAnalog
Thanks for subscribing! I'll do this video very soon. I really have been chomping at the bit to do it just for the reason you stated. It would help others put their concerns of noise at bay;)
FYI. The output crap on my switcher measures 50Khz at 30mv. I'm sure it would probably change with the load. I think it might have had a 2A load at the time I measured. Thanks
Thanks for that info. Knowing the frequency and ripple voltage is very useful.
I'm wondering : When you wind (as in 19:00 in the video) one phase on one side and the other phase on the other side, you built two coils that each create a magnetic field separately that just 'connects' via the core top and bottom section (between the two phase coils).
With those separate coils wound, if you have significant differential mode current, wouldn't the magnetic fields in each coil saturate the core, thus rendering the whole choke useless for common-mode currents as well ? After all, the two coils need to exchange their magnetic field via the core.
Wouldn't it be smarter to wind BOTH phase wires next to each other, so differential mode current never builds up a magnetic field in the core ?
Not enough design info!
Thanks for the feedback! Yes this was just a 'How to wind a CM choke'. But I will do a video on how to actually design one. I didn't get a lot of feedback asking for this so I didn't make it a priority. I think I asked in the video for comments on 'if you want to see a design'.
I struggle when it comes to winding inductors, always have to think it through but still second guess myself.
It threw me off when you started winding the second coil on the toroid and described it as being wound backwards to the first. I look at both wires and see them both going down through the center. But I guess it all depends on the mode. If the current is flowing the same direction on both wires, then the current is passing through the center of the toroid in the same direction, but when the current flow is differential, one wire has current going down through the center and the other wire has it coming up through the center.
It might help to see both wires wound on the same half of the toroid.
Thanks for the great feedback! I will show how to do this again - and how to select the core as well.
Good Evening kiss Anulog
Thanks 👍
SUBSTANTIAL kiss Anulog
From Nick Ayivor from London England UK 🇬🇧
Thanks so much!