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.
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."
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.
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?
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...
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 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.
@@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
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?
