Testing the transient response of PWM converters by LTspice

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#phasemargin #PWM #stepresponse #PWMstability

[@SMV1972]

Какие же у Вас фундаментальные знания.! Вся силовая электроника для Вас как таблица умножения. И вы этим делитесь. Благодарю Вас!

[@sambenyaakov]

большое спасибо

[@SMV1972]

@@sambenyaakov Здравствуйте! Не смог самостоятельно разобраться. Никак не получается получить график Боде для LC. Не могли бы Вы объяснить куда вводится параметр Table(0, 0, 10, 10) . Заранее спасибо

[@sambenyaakov]

@@SMV1972 This belongs to the dependent voltage source E

[@slazinger]

Marvellous video as always. I myself have expirience designing and testing this type of converters and I have always wondered why the step response wasn't really matching with the phase margin measurements. The more I learn about loop analysis, the more I find that in real applications there are a lot of nuances that affect the behaviour of the systems and most of the time is not easy or intuitive to draw conclusions.

[@sambenyaakov]

Thank you very much for sharing you experience and thoughts.

[@joet4348]

Hi Sam, I just wanted to acknowledge how amazing it is to have your presentations available on KZbin. I'm grateful that you take the time to share your experience and knowledge with us. You have so many videos covering topics of interest for me (especially in power electronics). I have some textbooks that I want to use for self study but I have struggled to find time to work through these massive books. I can get quality exposure to electronics through your videos to supplement the experience I pick up at work. I'd appreciate it if you continued to share videos with us for a long time to come.

[@sambenyaakov]

Thanks for kind note. Comments like yours keep me going.

[@Zetex2000]

As always very interesting and helpful. Thanks! 😊

[@sambenyaakov]

👍😊🙏

[@ikocheratcr]

Looking at the current thru inductor after changing the feedback capacitor, I realized that a capacitor that loses its value can create a damage path that make some transistor pull more current and damage it. I think this is something you will never see a root locus plot, but shows an interesting chain of events for a catastrophic failure.

[@sambenyaakov]

If you mean reduced capacitance you certainly can see this in the transfer function if you model the cap after change. But if you mean a partial short this is a different story.

[@Graham_Wideman]

Very nice examination! A minor point -- 18:42 "the switching frequency is about 30 kHz now (since it is a constant on time the frequency might change)". Yet the handwriting says fs ~= 300kHz. The waveforms show a main frequency around 27kHz (agreeing with the handwritten fc) with smaller waves (I assume the switching frequency) around 180kHz, it seems to me. The 180 kHz seems more likely a deviation from 300kHz than from 30kHz. So I believe the handwritten 300kHz is correct, not the voice 30kHz?

[@sambenyaakov]

Yes, you are right, I meant 300kHz. You have a sharp perception and endurance, only about 20% of the viewers reach 18 minutes😊

[@Graham_Wideman]

@@sambenyaakov Thanks for the reply! Since 100% of the presenter reached the end of the video, I feel it is my duty to watch the whole thing 🙂.

[@sambenyaakov]

👍Hear, hear!

[@tamaseduard5145]

👍🙏❤️

[@sambenyaakov]

Thanks

[@vicentematricardi3596]

❤❤❤❤❤👍👍👍👍

[@sambenyaakov]

Wow. Thanks. I appreciate it.

[@vicentematricardi3596]

@@sambenyaakov Tengo un gran aprecio hacía su persona... 👍

[@sambenyaakov]

@@vicentematricardi3596 🙏

[@raviselvans1963]

Thanks a lot prof. I have one doubt why ppl are recommending gain margin should be above 12 db? What the role of gain margin?

[@sambenyaakov]

Gain margin is another issue. I have a assumed that there is only one area in which the LG approaches 1. If at another frequency the LG approaches 1 it is altogether another story. Perhaps a video on that will be interesting😊

[@biswajit681]

Hi sir could you please make a video on average modelling of peak current mode active clamp forward converter

[@sambenyaakov]

Too specific. Will try.

[@biswajit681]

@@sambenyaakov Thanks sir .. actually there are all lot resources available on Flyback converter but not on Forward converter ...it's very hard to find out good resource on Forward converter