If it is Power Electronics, it has to be understood by Prof. Sam Ben Yaakov. Lots of love from the students in India.
@sambenyaakov5 жыл бұрын
Thanks. Good luck with your studies😊
@ankitkherodiya29616 жыл бұрын
Great Lecture professor....you became single point source for power electronics for me
@CourageousCoos7 жыл бұрын
We are designing/building forward converters to different specifications for a design project at university right now - this lecture was very helpful! Thankyou.
@sambenyaakov7 жыл бұрын
Thanks for comment. I am happy for being of help. Good luck.
@santiagomaudet66545 жыл бұрын
Thanks for the video! I'm preparing a test for University and your explanation was very helpful. I'm going to watch the Flyback converter video
@sambenyaakov5 жыл бұрын
Thanks for comment.
@stkarin8303 жыл бұрын
me too, T^T
@codydowling11207 жыл бұрын
Thank you Professor Ben-Yaakov. I love this style and format. I am looking forward to your other lectures.
@sambenyaakov7 жыл бұрын
Thanks for comment.
@saarboaz1235 жыл бұрын
Hii prof, first of all great lecture thank you! secound i will be more then glad if u can take a minute and replay . in the time t = 13:27 you show two formula's for the relation between n1/n3 that as i can see contradic each other. on the left side : n1/n3 > Don/Doff on the right side: n1/n3> Doff/Don what am i missing? is there a chance of a mistake? as far as i can see : n1/n3> Don/Doff is the right answer. thank you very mutch
@yogiranjit3 жыл бұрын
in slide no 7 . when Vreset > Vin. then during off period of switch. the anode of diode has Vin and cathode has Vreset. then how will the diode the turn on. and how will the reset happen??
@sambenyaakov3 жыл бұрын
When the inductor current is interrupted, the voltage tend to swigs toward very high voltage and clamped by Vreset. See kzbin.info/www/bejne/fqXamnx_hcqenNU
@iosucrack4 жыл бұрын
Hello. Nice video! I have a question. In the part of the video where the voltage is klamped (10:00), why do you need to do this in the forward converter but you do not need to do it in the flyback converter?
@sambenyaakov4 жыл бұрын
In Flyback the clamping is by the secondary, save the spike due to leakage inductor which you need to clamp.
@rakeshpanda21162 жыл бұрын
Hi Prof, i think there is a slight mistake at 14 min. n1/n3 shold be less than Doff/Don ( not Don/Doff). Please correct me if i am wrong
@sambenyaakov2 жыл бұрын
Thanks for comment: Sam Ben-Yaakov 9 months ago Yes there is an error pointed out 4 years ago😊 JeffH 4 years ago Hi Professor, @14:12 shouldnt n3/n1 be less Doff/Don? Sam Ben-Yaakov 4 years ago Hi Jeff, correct. Indeed, the expression is messed up. It should be as you pointed out. Thank you very much for pointing this out. You have a keen eye.
@sambenyaakov2 жыл бұрын
Thanks for comment Sam Ben-Yaakov 9 months ago Yes there is an error pointed out 4 years ago😊 JeffH 4 years ago Hi Professor, @14:12 shouldnt n3/n1 be less Doff/Don? Sam Ben-Yaakov 4 years ago Hi Jeff, correct. Indeed, the expression is messed up. It should be as you pointed out. Thank you very much for pointing this out. You have a keen eye.
@saurabhkumar-it9ef3 жыл бұрын
Best explanation ever, keep it up sir 🔥🔥🔥🔥🔥🔥❤️❤️❤️❤️❤️❤️
@sambenyaakov3 жыл бұрын
👍😊🙏
@lanpingdeng10943 жыл бұрын
Dear Professor Yaakov, I can understand the n3/n1 calculation at 12:51, but it doesn't match with "n3/n1" at 16:49. Could it be that the "Vin*n1/n3" of S2 at 15:43 should be written as "Vin*n3/n1"?
@sambenyaakov3 жыл бұрын
Yes there is an error pointed out 4 years ago😊 JeffH 4 years ago Hi Professor, @14:12 shouldnt n3/n1 be less Doff/Don? Sam Ben-Yaakov 4 years ago Hi Jeff, correct. Indeed, the expression is messed up. It should be as you pointed out. Thank you very much for pointing this out. You have a keen eye.
@swh197 жыл бұрын
Hi Professor, @14:12 shouldnt n3/n1 be less Doff/Don?
@sambenyaakov7 жыл бұрын
Hi Jeff, correct. Indeed, the expression is messed up. It should be as you pointed out. Thank you very much for pointing this out. You have a keen eye.
@sankettambe15802 жыл бұрын
Thank you so much sir for clearing our concepts
@sambenyaakov2 жыл бұрын
🙏😊
@enestalha57183 жыл бұрын
You are the best, thanks for all these clean explanations
@sambenyaakov3 жыл бұрын
🙏😊
@amjadtrablsi40515 күн бұрын
very useful thank you a lot
@sambenyaakov5 күн бұрын
Thanks
@rraj5917 жыл бұрын
Thanks professor.....keep uploading such videos
@RobNO5 жыл бұрын
So why flyback converter does not need this third coil?
@sambenyaakov5 жыл бұрын
In flyback' energy is stored in core and them discharged into the secondary. In forawrd energy is not supposed to be stored in core, but some does due to magnetization so this has to be discharged by a third winding. or some other means.
@sujoybha3 жыл бұрын
Thanks a lot for the detailed explanation sir. I was wondering if forward converters have any practical applications? It seems that at low power ranges, Flyback would dominate and at higher power it is better to go for push-pull or half bridge. I would love to know your thoughts on the same.
@sambenyaakov3 жыл бұрын
Hi, Forward converters were used in the range of few 100s W. These days, the LLC seems to take over.
@sujoybha3 жыл бұрын
@@sambenyaakov that answers my question. Thank you very much.
@sujoybha3 жыл бұрын
@@sambenyaakov also I presume two switch forward was used in the 100W design? Or was it some other topology?
@gurpreetsingh-yq5hg3 жыл бұрын
great sir, i have to design 20v 10 A , 0.1% ripple 2 switch forward converter i am new to power electronics , can you tell what will be the output inductor and capacitor
@sambenyaakov3 жыл бұрын
Forward is basically an isolated buck. See kzbin.info/www/bejne/fqXamnx_hcqenNU
@reynolds0873 жыл бұрын
Can a toroid be used for the core of an isolated switch-mode power supply? I never see a ferrite toroid used for the core of SMPS when they have isolation, and I always wondered why. All of the buck boost converters I see use a toroid, but they are not isolated.
@sambenyaakov3 жыл бұрын
Thank for bringing up a good question. Toroids are used in flyback but less often. They tend to have a higher leakage inductance which is increasing losses and spikes. They would be a good choice if one needs very high insulation between primary and secondary because you can put them apart. Using ZVS techniques will reduce the leakage losses.
@pausgaard3332 жыл бұрын
This was very informative, thank you very much. I was looking at schematics and could not get the reset winding to work in my head before I heard your explanation.
@sambenyaakov2 жыл бұрын
👍
@sivadharshan12358 ай бұрын
Sir, why shouldn't we connect the first switch (S1) to the return of the supply? (At 1:00)
@sambenyaakov8 ай бұрын
? I don't follow.
@vasiliy55782 жыл бұрын
Hello Professor! My question regards a magnetization inductance problem (7:04) is follow: In a few sources I saw that there is a gap recommended in the forward converter transformer. But after your video I am realizing that gap is not needed. Even more, a gap should make situation even worse (Larger gap -> lower magnetization inductance -> higher magnetization current). Are there any hidden reasons to make a gap in a forward converter transformer? What do you think?
@sambenyaakov2 жыл бұрын
Strictly speaking the forward transformer does not need a gap. However, I would imagine that in some cases a gap can be helpful. For example: if DC current is expected at the primary or secondary or if the resonant frequency between primary and associated caps is very low.
@vasiliy55782 жыл бұрын
@@sambenyaakov Thank you, Professor!
@waileung356611 ай бұрын
why the input voltage is DC, but we can use transformer to step up or step down the voltage in this circuit?
@sambenyaakov11 ай бұрын
You mean AC instead of DC at input? No
@duncanjamesbarker52203 жыл бұрын
at 19:18 you show the currents I1 and I2 start from a large value , then rise linearly, why dont they start from zero?
@sambenyaakov3 жыл бұрын
In CCM, the inductor current does not drop to zero
@duncanjamesbarker52203 жыл бұрын
@@sambenyaakov I see. I thought the point of the reset winding was to make the flux in the core go completely to zero..which dosnt occur in CCM, right? what am i missing?
@sambenyaakov3 жыл бұрын
The current is a reflection of secondary not the magnetization current.
@siamak12467 жыл бұрын
wow! professor thanks for nice explanation. I really enjoy your lectures.
@sambenyaakov7 жыл бұрын
Thanks.
@MinhuChen4 жыл бұрын
Very detailed explanation! Thank you!
@sambenyaakov4 жыл бұрын
😊
@biboguitar6 жыл бұрын
really nice lecture. I wish you were my teacher when I first learned PE
@sambenyaakov6 жыл бұрын
Thanks
@AlexanderSelyutin2 жыл бұрын
Первое нормально объяснение работы прямого преобразователя и особенно того как происходит сброс индуктивности. Спасибо.
@sambenyaakov2 жыл бұрын
Thanks to you and to Google translate.
@AlexanderSelyutin2 жыл бұрын
@@sambenyaakovI did not expect you to read this comment and wrote more for myself). Thank you for this channel!
@lammmpo5 жыл бұрын
Thanks for the video, it helped me a lot.
@sambenyaakov5 жыл бұрын
👍
@reshmajha11464 жыл бұрын
I was thinking transformer is ac device then how DC voltage can be use on high frequency transformer, how switching helps transformer to operate on dc
@sambenyaakov4 жыл бұрын
The switching act transfers the DC to AC, like chopping, such that the transformer sees an AC voltage
@VasanthBattula5 жыл бұрын
Respected professor which type of DC-DC Converter is suitable for connecting PV System to HVDC transmission system.
@sambenyaakov5 жыл бұрын
I would consider a series resonant converter.
@pratimchatterjee24014 жыл бұрын
Thanks for this
@sambenyaakov4 жыл бұрын
Thanks
@abhijithprabha63774 жыл бұрын
very good content
@sambenyaakov4 жыл бұрын
Thanks
@oszem5 жыл бұрын
Regarding to the first schematic, if it is a voltage generator, than I(in) will increase in the transformator, so I think the Io will not be constant acc. to Faraday's law (will increase too). So the rectangular signal shape is not correct. Am I right?
@sambenyaakov5 жыл бұрын
This is considered to be an ideal transformer which by definition is assumed to have an infinite magnetization inductance.
@oszem5 жыл бұрын
Dear Professor, now I understand. Thank you!
@abhijithprabha63774 жыл бұрын
Can you explain about active clamping techniques also?
@sambenyaakov4 жыл бұрын
See kzbin.info/www/bejne/r4SmXoaspLaUabc
@thezodiace73993 жыл бұрын
Great lecture Sir, at 12:05 why can't the demagnetization be performed on the secondary side of the transformer? and why can we put the catching diode across the transformer primary? I mean why add the third winding to demagnetize the transformer?
@sambenyaakov3 жыл бұрын
The third winding helps to recycle the magnetization energy kzbin.info/www/bejne/hXWbnnWJqK-ZgM0
@thezodiace73993 жыл бұрын
@@sambenyaakov ok but why can't we just put a catching diode in a parallel with the primary side.
@sambenyaakov3 жыл бұрын
@@thezodiace7399 this will not the magnetization. Zero n voltage on inductor constant current
@fayyazbahrami2964 жыл бұрын
Thanks for video, can we use a forward transformer for a resistive load without output diode?
@sambenyaakov4 жыл бұрын
You can but it would not operate as a forward converter. Just a transformer
@mohamedarrach36886 жыл бұрын
Hi Dr. in the @07:03, if the n turns of the transformer ratio is higher, can we have Vout > Vin so a boost converter ?
@sambenyaakov6 жыл бұрын
Yes, but this is not a "Boost converter"
@davidcano906 жыл бұрын
Thanks Professor. I have a question: You said at 12:01 that the magnetization current finds its way through the reset path (n3 winding). Could that current find its way through the n2 winding aswell? Greetings from Colombia.
@sambenyaakov6 жыл бұрын
No, because of the diode in n2 (the voltage at this instance is of opposite polarity)
@davidcano906 жыл бұрын
Professor, thank you for your answer. Now a question that could be a little bit out of context: following the same procedure shown at 8:45 but in a push-pull, when both transistors are off, why the voltage of the transistor is just Vin? should not it be 2Vin? Thank you for your help.
@sambenyaakov6 жыл бұрын
In push pull, the secondaries are shorted which is reflected to the primary.
@adamsalam66124 жыл бұрын
Thank you for this video, can we remove the inductor in the output and put just diode and capacitor like flyback converter?
@sambenyaakov4 жыл бұрын
No. This will be like a short (a transformer between input and output)
@adamsalam66124 жыл бұрын
@@sambenyaakov thank you professor
@AnujSingh-lq8ty4 жыл бұрын
Very informative video, thanks
@sambenyaakov4 жыл бұрын
Thanks
@dianec.29206 жыл бұрын
Thank you! This is very helpful
@sambenyaakov6 жыл бұрын
Thanks
@kolinevans91276 жыл бұрын
thank you greatly for sharing
@sambenyaakov6 жыл бұрын
Thanks
@progamermat6 жыл бұрын
Can you please make a video on Active Clamp forward converter
@sambenyaakov6 жыл бұрын
Will try
@progamermat6 жыл бұрын
There is no videos available in youtube that explains the working of Active clamp forward converter.
@sambenyaakov6 жыл бұрын
Well, you seem to be good in persuasions. I was planning to prepare next a video on "multiphase, interleaving and ripple cancellation". You think active clamp has priority?
@sambenyaakov6 жыл бұрын
just found kzbin.info/www/bejne/i5rHi2V6rsSLrqM
@progamermat6 жыл бұрын
good quote but its just their product promotion, the explanation that you have given is very eazy to pickup.
@dogukanayc27615 жыл бұрын
Thanks for this great lecture
@sambenyaakov5 жыл бұрын
🙂
@dogukanayc27615 жыл бұрын
@@sambenyaakov I could give a good sheet in my exam. Greatings from Turkey :)
@sambenyaakov5 жыл бұрын
👍😊
@cortneysbrain-slap5248 Жыл бұрын
I had to set the speed to x1.5. The pace of the video was brutally slow. 🥱🥱🥱🥱
@sambenyaakov Жыл бұрын
Well well well, no thank you for sharing, no intelligent comment, just wailing like a baby. About 43000 people watches this video and only you are complaining. Doesn't it tell you something? Did it ever occurred to you that many of the people watching this video have difficulty understanding English and a lower pace helps them? Or that I myself am not a native English speaker and it takes me time to choose the words? So you slowed down the video, big deal. This is far below fake news, this is idiotic news. Grow up.