Transformer saturation and gapped core current transformer

Рет қаралды 2,953

Sam Ben-Yaakov

Ай бұрын

#magnetics #transformer #currenttransformer #CT #magneticsaturation

Пікірлер: 28

@k7iq 26 күн бұрын

An wonderful video filled with very pertinent and useful information !

@sambenyaakov 25 күн бұрын

Thanks.

@hugogomeztagleperez8858 Ай бұрын

Excellent video. With the academic rigor that is due, and with the necessary pedagogy. Congratulations teacher. Keep it up.

@sambenyaakov Ай бұрын

Many thanks!

@getusel Ай бұрын

I read our esteemed professor’s comment to another gentleman’s thread on LinkedIn. I was expecting a video that clarify the misconception. Here it is. Thank for teaching us all.

@sambenyaakov Ай бұрын

🙂👍🙏

@Chris_Grossman Ай бұрын

This was interesting. However I have issue with the statement that the voltage causes the saturation. The saturation is caused by magnetic flux density reaching a value where the all domains in the magmatic circuit are aligned. That saturation value (peak flux density)is proportional to V/f (slide 8). This to me seems better than "the saturation is caused by the voltage."

@sambenyaakov Ай бұрын

Yes, I agree in general. However, the domain explanation does not provide quantitative relationships. Or, why will be the domain more "aligned" at a lower frequency. I was said that the saturation is caused by the voltage because, as you might know, the presentation is an in fact an answer to a LinkedIn post that was related to line (fixed frequency) CTs. Thanks for the conversation.

@vicentematricardi3596 Ай бұрын

Muchas Gracias Maestro !!!! ❤❤❤❤❤🙏🙏🙏🙏🙏👍

@sambenyaakov Ай бұрын

Thanks😊

@Txepetxcc 6 күн бұрын

Hi professor. Related to this topic, DC-blocking capacitors in DAB converters.There are people that indicate that DC bias can be solved with a gap in the transformer, others say that DC capacitor is always necessary. I thing that resolution of PWM in microcontrollers is going to always generate some DC and in transients very likely a DC half-cycle applied, and hence saturation. Can you dedicate a video commenting misconceptions on this issue?

@sambenyaakov 4 күн бұрын

Will try. The best solution is to use current mode control.

@ats89117 Ай бұрын

Very instructive video. It would be interesting to hear your take on how a gapped transformer compares with a transformer wound on a distributed gap material with the same relative permeability...

@sambenyaakov Ай бұрын

Thanks. Good topic. Will try.

@RaedMohsen Ай бұрын

Nice refresher. While I agree with the effect of the gap on the B-H, I kinda don't get why people would introduce it the way you mentioned in the first part of the video. Sure, having a gap would allow higher current, but it changes the inductance as well whose value is crucial in power electronics.

@sambenyaakov Ай бұрын

You need to accommodate I^2*L/2. The physics is such that a core with a gap will the smallest for a given energy.

@josephgharakhani5375 21 күн бұрын

@@sambenyaakov I am having the same confusion, let's say in a buck/boost converter we need to have enough L to store the energy to be used later and then by adding the gap we are reducing the overall L. I can wrap my head around it if I look at it in term of increasing the current margin without going to saturation but not when I try to analyze it with the amount stored energy in mind.

@sambenyaakov 18 күн бұрын

@@josephgharakhani5375 You can not store energy unless you reduce Ur (having a gap) since the core will saturate with very little current. So you have to add to "need to have enough L " WITHOUT SATURATING THE CORE

@josephgharakhani5375 18 күн бұрын

@@sambenyaakov Thank you Sam for taking the time. Much appreciated! You are amazing educator! simple, concise, right to the point. Awesome!

@sambenyaakov 17 күн бұрын

@@josephgharakhani5375 👍👍

@tamaseduard5145 Ай бұрын

👍🙏❤️

@sambenyaakov Ай бұрын

Thanks🙂

@SkippiiKai Ай бұрын

Thanks, I really learned a lot from this! However, now I'm more confused than ever about the air-gapped transformers in Switch-mode power supplies, which I assume are voltage transformers, and use non-sinusoidal, pulsed waveforms; all of which you list as cons. Will you make another video explaining the use and the pros and cons of air gaps for flyback transformers and forward converters?

@sambenyaakov Ай бұрын

The flyback element is NOT a transformer. It is a coupled inducror.