Recent content by Mathhhew

You're right that's better :smile: thanks!

I'm sorry but I still don't understand what am I looking at. There's too much spikes and the phase is going from -8K° to 10K° seems absurd (is it 10 kilo degree?)

Right, but in a second order filter, capacitors are required When you plot the bode diagram, why aren't you using only an AC generator (without the CM generator)? And last, It is the first time that I see this kind of diagram (the rejection one), so I don't really understand what I should notice

I did what you've said and indeed it looks better :)But I don't understand why the resistance was the problem. In a real montage, I would have this serie resistance, so shouldn't I include it to be closer to the real montage? And I'm still interested to know that, because I still have a...

Hello! So I've ploted the bode diagram of a filter and I've obatined a weird result: some kind of resonance (we clearly see it on the phase plot, less on the gain plot) But it only appears when I've added the ground to the generator, and I'm not sure if it is really needed (the new reference...

Sure From https://www.allaboutcircuits.com/technical-articles/designing-and-simulating-emc-filters-ltspice/

Hello Is there a way to use LtSpice to simulate "real" common mode current? I know that buck converter for example produce common mode mode current, and I thought comparing a real system to our "homemade" model might be quite relevant, but I began using Lt spice with this project, so I'm not...

Thank you for your answer, it helps a lot! What happened to the two capacitor I previously had in serie with R1 and R2? Were they useless? And back on my previous circuit, the guy who gave me the circuit said that I would be able to see oscillations at the beginning of the filtered signal...

ok so there was a conflict with the ground. Still I have two question: what are the two resistors for? Because I've tried without and I saw no difference. And I don't understand the word "plucking"😅

Hello So I ran into a problem when I tried to plug the CM filter. What I did is to model the choke with a 1:1 transformer and then add two capacitor to complete the filter. But that doesn't work as expected. Instead of a continuous intensity, I'm getting some weird oscillations, and I don't...

Hello yes you're right I confused the two generators. The resistance was only here to measure the intensity created by the generator, because back then, I had a problem, I couldn't measure it directly from V1. Anyway I just deleted it. here's also the txt file you requested

According to the table, and because I have wires with a section of 0.5mm2 (approx. 24 AWG), I should be able to use up to 3.5 A. That should be enough for what I'm going to do, even after dividing by 4. But I was thinking of another method. I assume the main problem with current is how high the...

Hello! I assume that was the problem, because now it matches the other graph, thanks! I need the internal resistance, otherwhise current at R3 is constant without any perturbation (now it works :)

The question was about how much differential current. I'm not really satisfied with your answer because the measure will be hard to conduct. Is there some kind of order of magnitude of current related to the section of the wire it is going through or a way to estimate it if I know from what...

Common mode current will be created with a step-down chopper powered with 15V and from what I've read, we can expect a peak at 0.1 A. The coil has around 30 windings. Here's some pictures (the ruler is graduated in centimeters)