Thank you very much! Amazing presentation. Universities should start two semester subject called "Watching Sam Ben-Yaakovs presentations on RUclips". This would increate the quality of many departments by hundreds of percents :)
using tanh to approximate permeability vs dc bias seems to work fine for high permeability magnetics inc. powder cores. flux=-1/500*(0.25x*x-42*abs(x)+71*log(cosh(0.5*abs(x))))*sgn(x) they have a curve fit excel sheet for their cores. this is 430 turns on their 58740 core from 0.33a to 2.33a
Dear Sir, thanks for your video, In my case, using the same Flux equation, beyond certain current, the inductor value is becoming negative. How do you fix this issue?
What if we just compare voltage? Hi Sam, Why equation is not valid for negative currents? this is because no constant of integration? I don't understand root cause of this problem and why abs + sign fix it. Could you describe it a bit more?
Hi Marcin, to cover the two quadrants, you need one of 1. one equation that will fit the two quadrants (such as using the tanh template) but this is tricky. 2. use two equations and switch between them 3, use one equation for the absolute value, and get the negative part by adding the sign while relying on the symmetry, as I did
Just a question professor. At one point in the flux equation you used X while the other time you used I(I1). What is the difference between the two. Also, if anyone else can help me?
I can always find what I need in your channel. Thanks professor!
Thanks. So nice of you.
Fantastically explained. Thank you Professor
👍
Thank you Professor! Useful knowledge indeed.
On a side note you could also use: Flux = ( 100u - 8.33u*abs(X) )*X
to deal with the negative currents
Nice. Even better. No potential problem when I=0. Thanks.
I was just looking for info on this topic and I've found your video. Great explanation. Thank you very much.
😊👍🙏
Thank you very much! Amazing presentation. Universities should start two semester subject called "Watching Sam Ben-Yaakovs presentations on RUclips". This would increate the quality of many departments by hundreds of percents :)
😊🙏
using tanh to approximate permeability vs dc bias seems to work fine for high permeability magnetics inc. powder cores. flux=-1/500*(0.25x*x-42*abs(x)+71*log(cosh(0.5*abs(x))))*sgn(x) they have a curve fit excel sheet for their cores. this is 430 turns on their 58740 core from 0.33a to 2.33a
Dear Henrik, Thanks for input.
Thank you Professor! help a lot！
I'd like to ask why there is a 1G ohm resistor in parallel with the voltage source in the model？what is the use？
Thanks. I guess "current source." This is to help LTspice to converge at the operating point.
Can we use the behavior voltage source as in DC-DC converter inductor? (Forcing differential voltage across it rather than inject current into)
Yes, but you need a some résistance in between so SPICE can solve the network equation
Thank you for clarification
Thanks
Dear Sir, thanks for your video,
In my case, using the same Flux equation, beyond certain current, the inductor value is becoming negative. How do you fix this issue?
Send me details to sam.benyaakov@gmail.com
@@sambenyaakov dear sir, simulation and excel calculation files shared, please help
Thank you Sir!
Thanks
What if we just compare voltage?
Hi Sam,
Why equation is not valid for negative currents? this is because no constant of integration? I don't understand root cause of this problem and why abs + sign fix it. Could you describe it a bit more?
Hi Marcin, to cover the two quadrants, you need one of
1. one equation that will fit the two quadrants (such as using the tanh template) but this is tricky.
2. use two equations and switch between them
3, use one equation for the absolute value, and get the negative part by adding the sign while relying on the symmetry, as I did
Just a question professor. At one point in the flux equation you used X while the other time you used I(I1). What is the difference between the two. Also, if anyone else can help me?
Sorry for the mix up. Yes, the same.
@@sambenyaakov Thank you professor.