I dont know what to say except WOW. This is extremely high level educational content, exceptional explanation. Im watching your presentations instead of my favorite movies in the evening! Thank you!!!
Super useful video. It looks I accidentally re-discovered the active phase shifted PWM when I was designing my inverter circuit. I knew it was probably extensively explored in literature, but I just was having fun playing with timings myself to improve the circuit. I think it is very elegant, and with DSP control it is also really easy to tweak. One can for example actively monitor voltages at the switching nodes, and figure out when is the right time to do transitions as quickly as possible.
Thank you Professor Ben-Yaakov. I hold a respect for you and your content. The level of details captured in your video series are very useful in understanding real world circuits
Thank you Prof. Ben-Yaakov, this is definitely one of the best elaborated video on the subject. I really helped me a lot understanding the techniques you presented and explained. I do have simulator software and your lecture saved me hours of work. Thank you so much for enlightening the knowledge by sharing your knowledge. I subscribed to your channel and also liked your videos. Thank you so much.
@@sambenyaakov Good explanation, it's like you teaching grade R ,which is what we need as students.People like you transfer knowledge from one generation to another.
I've built a ZVS driver using the third option the passive lossless snubber because I need the capacitor to dump all its energy at once in the primary coil of my flyback, the flyback produces about 150KV, I can pull 15cm very hot plasma arcs with it... You're absolutely right about the safety, it's very very dangerous indeed. But a lot of fun to play with.
Thank you dear professor sam you are really a graet academic person in terms of knowledge and explain with aging experiences and sharing all in simple way.
You do an excellent job of explaining voltage snubbers in this video! I am trying to create a LT Spice model to simulate different snubber configurations and view the timing so I can gain more experience. One of the questions I now have is: How can I be sure I have selected an appropriate diode for the application? (short of building it in hardware and testing it for magic smoke)
I would like to thank you for the excellent material presented in all your lectures . I am a little puzzled at 24.56 in this lecture . If I have followed your reasoning correctly , then I think that Vin > 1/2Vo should be Vin < 1/2Vo in order to reset the capacitor to at least Vin . Please correct me if I am wrong .
Thank you for the very detailed information. Could you explain what is the topology of the last converter? It look different than a boost and the transformer doesn't allow DC to pass through.
I sometimes find it confusing trying to follow your thoughts because I don't have a clue where your pen is pointing to. That said, it was very enlightening to know warts and all about the reality of circuits and their components. Have you given any thought about the same topic but done with vacuum tubes instead? Would they perform better or worse? Could you do a video on the Ćuk converter? Other video suggestion would be protection at the input and at the output when power is lost or load is disconnected or developes a short. Thanks.
At 27:15, i can see a capacitor in series with inductor. But this capacitor was removed in further explanations. May i know the reason for the absence of this capacitor. Will this converter be still a resonant converter even in the absence of this series capacitor.?
You have a keen eye. The capacitor is used to avoid average DC voltage on the transformer. If, however, one uses PCM control than the capcitor may not be needed.
Sam - on the very first slide, you show two different hand-drawn graphs both labeled "ID". One appears to be the switch drain current, the other appears to be diode current including reverse recovery (also drawn below the schematic with an inductor labeled Ls instead of Lm like in the schematic). They are completely different. The schematic does not have any label defining what is ID? This is confusing to a student trying to learn this for the first time. Please make sure that variables are uniquely identified, and properly labeled in the schematic.
Thanks professor, I was just wondering that in the first example you are using snubber in parallel to diode, doesn't this provide a path for current to flow in the reverse direction when the diode is in blocking mode?
Hallo Prof. Ben-Yaakov, I have been using your videos to understand these important concepts. Could you please share the books (papers) you referred to for making this video?
Hi, at 16:50. Probably just words game, but closed fet already has 0v, so any openings of fet you want to happen at zero current, and closing at zero v. Thanks for sharing your lectures!
@@romma11 In this case, the FET is conducting so there is a current passing through it. Tp achive ZCS you need an auxiliary switch that will force the current to zero (by re-routing it) at this part I am considering passive solutions.
Thanks for the video. I got question about turn-off losses of PSFB converter, since with the ZVS we get rid off only turn on losses. What part of losses is turn-of losses? Thanks!
@@sambenyaakov Sorry, I asked question wrong. I had in mind the following: what part of the loss falls on turning-on and which on turning-off of the the transistor. What is more significant loss on turning-on or loss on turning-off or they equal? In datasheet of the transistor there is Eon and Eoff - parameters, where Eoff>Eon. Does this mean turn-off losses more than turn-on losses?
thank you ! professor! As i know from your lecture , the circuit from M.domb,R,Redl and N.sokal just reduced VDS slope when FET turn off . it will not help to turn on .Am i correct?
@@DOODI7100 This circuit gives no advantage at switch-on . In fact, there is a slight disadvantage at switch-on because the voltage on the lossless capacitor must be reversed via the resonant circuit which results in a half sinusoidal current peak .
Respected professor I am in confusion to select which type of converter. Isolated or no isolated or soft switching techniques for 1mw pv system. Can you help me where can I get all the information regarding DC DC converter.
You sir, are a legend for delivering such good educational content. 🙏 saved me hours of research.
😊🙏
This is gold mine of knowledge. Thanks Mr. Yaakov
Thank you for comment.
Prof. Yaakov, how can I thank you for this video. You have saved me countless nights of research
Thanks for comment
many thanks! Prof. SBY , i am getting energy through your lectures ! may God return to the best one of your prayers !
Thanks.
I dont know what to say except WOW. This is extremely high level educational content, exceptional explanation. Im watching your presentations instead of my favorite movies in the evening! Thank you!!!
Thanks for e kind comment. I hope this does not mean that the videos put you to sleep😉
Super useful video. It looks I accidentally re-discovered the active phase shifted PWM when I was designing my inverter circuit. I knew it was probably extensively explored in literature, but I just was having fun playing with timings myself to improve the circuit. I think it is very elegant, and with DSP control it is also really easy to tweak. One can for example actively monitor voltages at the switching nodes, and figure out when is the right time to do transitions as quickly as possible.
Good points. Thanks.
Thank you Professor Ben-Yaakov. I hold a respect for you and your content. The level of details captured in your video series are very useful in understanding real world circuits
Thanks
Thank you Prof. Ben-Yaakov, this is definitely one of the best elaborated video on the subject. I really helped me a lot understanding the techniques you presented and explained. I do have simulator software and your lecture saved me hours of work. Thank you so much for enlightening the knowledge by sharing your knowledge. I subscribed to your channel and also liked your videos. Thank you so much.
Thank you. Comments like yours keep me going.
Thank you sir, I believe this is one of the best youtube channels featuring graduate level topics on power electronics.
Thanks
Thank you Mr. Yaakov! This is explained so well! I can't thank you enough!
😊Thanks
@@sambenyaakov Good explanation, it's like you teaching grade R ,which is what we need as students.People like you transfer knowledge from one generation to another.
Great explanations, best wishes for you.
Thanks
you are really a Proffesor,good and clear explaning. Thanks and I apologizze for my ugly english. Para Sam Hijo de Jacobo Shalom.
Hi Martin, Thanks. Perdón por el mal español
very clear and useful, thank you dear professor.
Thanks for kind note.
I've built a ZVS driver using the third option the passive lossless snubber because I need the capacitor to dump all its energy at once in the primary coil of my flyback, the flyback produces about 150KV, I can pull 15cm very hot plasma arcs with it... You're absolutely right about the safety, it's very very dangerous indeed. But a lot of fun to play with.
👍
Thank you dear professor sam you are really a graet academic person in terms of knowledge and explain with aging experiences and sharing all in simple way.
😊Thanks
I really appreciate your simplified way of transferring data. Thanks a lot
😊
Most grateful for your teachings. Thank you Prof. Ben-Yaakov.
Thanks for comment.
Great presentation, learned a ton!
Thanks
Thanks professor. This is very very helpful for understanding soft switching.
such a clever way of reducing losses. Thanks for the lesson
😊
"As long as you have charge carriers, the diode is conducting both ways" - quite a revelation for me not being deep into solid state physics!
Very important at high switching frequency.
Thank You Sir for Time and Knowledge
Thanks for comment.
Great video. It really helps a lot.
Thanks
Thank you prof.Yaakov
Very useful video
😊
You do an excellent job of explaining voltage snubbers in this video!
I am trying to create a LT Spice model to simulate different snubber configurations and view the timing so I can gain more experience. One of the questions I now have is: How can I be sure I have selected an appropriate diode for the application? (short of building it in hardware and testing it for magic smoke)
Recent SPICE and LTspice diodes are pretty specific diode functions.
Thank you ,by this video it's really easy to understand
Thanks for comment.
Excellent, thank you. I wish I could have been one of your students.
😊I guess it is impossible as yet to go forward to the past.
Now i know I am glad I watched this.
Thanks
the video is great. I hope you will put it in a list so we can watch in order instead of one by one.
You can use www.advicepoweracademy.com/video-tutorials for older videos
Very indepth information. Keep it up!
Thanks for comment.
Very helpful. Thanks
Thanks
I would like to thank you for the excellent material presented in all your lectures .
I am a little puzzled at 24.56 in this lecture .
If I have followed your reasoning correctly , then I think that Vin > 1/2Vo should be Vin < 1/2Vo in order to reset the capacitor to at least Vin .
Please correct me if I am wrong .
Hi, Thank for comment and for finding the error. Yes, you are absolutely correct. A slip of the tongue.
Thank you for the very detailed information. Could you explain what is the topology of the last converter? It look different than a boost and the transformer doesn't allow DC to pass through.
Please indicate the minute of video you are referring to.
28:00 Thank you.
Thank you Professor. Thanks a lot !
Thanks for comment
I sometimes find it confusing trying to follow your thoughts because I don't have a clue where your pen is pointing to. That said, it was very enlightening to know warts and all about the reality of circuits and their components. Have you given any thought about the same topic but done with vacuum tubes instead? Would they perform better or worse? Could you do a video on the Ćuk converter? Other video suggestion would be protection at the input and at the output when power is lost or load is disconnected or developes a short. Thanks.
I am sorry, some of the older videos did not record the pen movement. Too late to correct.
At 27:15, i can see a capacitor in series with inductor. But this capacitor was removed in further explanations. May i know the reason for the absence of this capacitor. Will this converter be still a resonant converter even in the absence of this series capacitor.?
You have a keen eye. The capacitor is used to avoid average DC voltage on the transformer. If, however, one uses PCM control than the capcitor may not be needed.
Thanks! Is that snubber can be implemented in buck or fly-back as well?
Yes
how can we calculate the phase shift between the control signals of the transistors to ensure the ZVS ?
Best way by simulation.
Thank you for your response, your video helps me a lot 👍
Sam - on the very first slide, you show two different hand-drawn graphs both labeled "ID". One appears to be the switch drain current, the other appears to be diode current including reverse recovery (also drawn below the schematic with an inductor labeled Ls instead of Lm like in the schematic). They are completely different. The schematic does not have any label defining what is ID? This is confusing to a student trying to learn this for the first time. Please make sure that variables are uniquely identified, and properly labeled in the schematic.
Noted
Thanks professor, I was just wondering that in the first example you are using snubber in parallel to diode, doesn't this provide a path for current to flow in the reverse direction when the diode is in blocking mode?
Only after reverse conduction of diode is completed. Before that the voltage of diode is still low.
Nice and simple..thanks
Thank you.
Hallo Prof. Ben-Yaakov,
I have been using your videos to understand these important concepts. Could you please share the books (papers) you referred to for making this video?
Thanks for comments. I am not aware of Books that present the subjects as I do.
Wow I'm watching this for making an silent and efficient flyback transformer driver for fun.
Thanks
Does the same principle is applied to phase shift half bridge inverter....
Yes
should it be refereed as ZCS as opposed to 'ZVS at turnoff'
To which minute in video are you referring to?
Hi, at 16:50. Probably just words game, but closed fet already has 0v, so any openings of fet you want to happen at zero current, and closing at zero v. Thanks for sharing your lectures!
@@romma11 In this case, the FET is conducting so there is a current passing through it. Tp achive ZCS you need an auxiliary switch that will force the current to zero (by re-routing it) at this part I am considering passive solutions.
Thanks for the video. I got question about turn-off losses of PSFB converter, since with the ZVS we get rid off only turn on losses. What part of losses is turn-of losses? Thanks!
Overlap between dt/dt and di/dt
@@sambenyaakov Sorry, I asked question wrong. I had in mind the following: what part of the loss falls on turning-on and which on turning-off of the the transistor. What is more significant loss on turning-on or loss on turning-off or they equal? In datasheet of the transistor there is Eon and Eoff - parameters, where Eoff>Eon. Does this mean turn-off losses more than turn-on losses?
Thank you very much!
Thanks!
😊🙏
Who is the teacher that would prepare me to understand Sam Ben-Yaakov?
🤔
@@sambenyaakov I love your lessons, the problem is me. I lack certain requisite understanding.
@@johnaweiss Keep watching and look for my earlier videos which cover the basics
thank you ! professor! As i know from your lecture , the circuit from M.domb,R,Redl and N.sokal just reduced VDS slope when FET turn off . it will not help to turn on .Am i correct?
correrct
First thank u Sam, but why it will not help to turn on? I see it help in both switching sides (ON and OFF) by reduces Vds slope.
@@DOODI7100 This circuit gives no advantage at switch-on . In fact, there is a slight disadvantage at switch-on because the voltage on the lossless capacitor must be reversed via the resonant circuit which results in a half sinusoidal current peak .
Thanks very much.
Respected professor I am in confusion to select which type of converter. Isolated or no isolated or soft switching techniques for 1mw pv system. Can you help me where can I get all the information regarding DC DC converter.
Hi, This is a too general question. You have to specify required output voltage. There might also be a problem of a start up.
Thank you.
Great
Please draw more clearly ..it's too clumsy..
HI waris kn, let's make a deal, next videos I will send you my clumsy drawings, you will redraw them nicely and I will record the videos. OK?
@@sambenyaakov that's a great idea.....you are a genius!!!!!
@@sambenyaakov LOL
Nice explanation. Horrible drawings.
Would you rather have nice drawings and terrible explanation?🙃
@@sambenyaakov I'd like them both to be nice :)
@@bekanadiradze9668 👍