People like you, who do not care about personal gains, and share the knowledge out for free are really not different from great. Sharing food to needy is considered the greatest thing one can donate, next is sharing of knowledge to the needy without personal gains. May people get inspired and the entire world becomes knowledgeable and compassionate. Thank you.
Thank you Professor Sam, I gain so much knowledge watching your lectures. Thank you for the hard work and willingness to share knowledge, you are an inspiration to me...
Your lectures are filled with fine details that are very important in design but are often not clearly explained in other texts. Also, thanks for covering the area winding method.
Sir, Thank you so much for sharing your knowledge.I Am watching most of your videos and it is really a knowledge hub . It is really helpful to learn in this pandemic situation. Looking forward for more videos. Thanks.
I believe that a follow-up video covering BCM and current-mode flybacks (the Weinberg converter) would be most interesting. Thank you for making the videos, Professor!
thank you very much for your impressive explanations on all your lectures. would you please elaborate on the two switch ''flyback'" topology which is frequently used in the 400w range of power 12v pfc power supplys used in server and network switch applications.
Hello Professor, thanks for making such an insightful video. I really learn a lot from your videos. Here in this video at 0:46, the peak current shown in Ton and Toff time is different. Please help me understand the cases where in the peak current will be different. To my belief, the inductor will not allow sudden change in the current, please enlighten. Thanks in advance.
Hi Sam thank you very much for your informative lecture. You say DCM core can be smaller because we can increase the switching frequency. However what about core losses in DCM its much higher than CCM because of high dB which could be a limiting factor that force the designer to increase the core size leading finally to lost DCM advantage ending up with similar or bigger core than CCM. Am I right?
Good point. But, if you keep same deltaB, losses increase per cm^3 so if the size is smaller total loss is reduced. But of course, there is the issue of thermal resistance. So each case has to be dealt with properly. Thanks for comment.
But what i never understand: why not use doublesided rectifiing? Would you not get the most power trough a core when it not has to store all of the energy from each half cycle instead of using the bit from other half too? Or is it only for making the pwm regulation easier?
Indeed, the transformer of a forward converter does not store energy. But per Murphy law, that converter has its share of problems, the transformer will not be appreciably smaller than the Flyback and you need an inductor at the secondary.
Hi Sir. I have to say something contradictory.. Usually the Core size of DCM is smaller than CCM, since CCM has a shifted remanence... Ripple current nothing but ripple flux density too..
Smaller? On what basis? Can you show me a DCM CCM magnetics designs of same power, efficiency and frequency in which the DCM is smaller size? This is an urban legend.
@@sambenyaakov Ha ha.. For a DCM how much swing on fux you can expect? 0 to 0.3? In CCM it may be from may be 0.1 to 0.3.. So without any flux swing there is nothing.. And hope you know energy density B^2/2u.. You have smaller energy density if you want to operate in CCM. Energy density nothing but its energy capability / volume. So more volume if energy density is less, so bigger core..
@@sambenyaakov And because of the high rms current you can say, need thicker wire.. But its not related to core size.. Thats why the area product method is not valid in case of inductor design, Its still useful in case of transformer since there is small amount of energy storage each cycle... For inductance or energy storage should be based on the core volume...
If you need thicker wire the winding window is larger and Ap larger. Unless you have bad non economical designs which do not use all Ap so both CCM and DC magnetics are wastefully large.
@@sambenyaakov Okay. Indeed.. But this we can say if the both flux swing are in same amplitude.. But its not. And for area product is inverse to flux swing, smaller flux swing will have more AP.. ( still AP is not based on core volume, which defines the energy handling)
People like you, who do not care about personal gains, and share the knowledge out for free are really not different from great. Sharing food to needy is considered the greatest thing one can donate, next is sharing of knowledge to the needy without personal gains. May people get inspired and the entire world becomes knowledgeable and compassionate. Thank you.
Hi, Thanks for warm words. Comments like yours keep me going😊
Haa great, a new videolesson! That is the best possible begin of the weekend!
1
You seems to b the first to watch😊I need to think about a "First watch" medal
@@sambenyaakov 😊
Thank you Professor Sam, I gain so much knowledge watching your lectures. Thank you for the hard work and willingness to share knowledge, you are an inspiration to me...
Thanks for warm note. Comments like yours keep me going.
@@sambenyaakov please don't ever stop... You are one of few people who make videos about such niche aspects and we are grateful for that.
Sam, keep your videos coming. High value and very useful.
😊
As always I am impressed by you and for sure your lecture gets me to have more intuitive insight on the power electronics.
Thanks for comment.
Your lectures are filled with fine details that are very important in design but are often not clearly explained in other texts. Also, thanks for covering the area winding method.
Thanks
Nicely explained, wonderful Prof. Sam. Thank you very much.
Thanks
Thank you SIr. Beautifully explained,
🙏😊
Your channel has a lot of excellent videos on switch-modes.
Thanks
Thanks Doctor Sam ....
Thanks
Thank you! Great intuitive explanation!
Thanks for kind note
Sir, Thank you so much for sharing your knowledge.I Am watching most of your videos and it is really a knowledge hub . It is really helpful to learn in this pandemic situation. Looking forward for more videos. Thanks.
👍😊
I believe that a follow-up video covering BCM and current-mode flybacks (the Weinberg converter) would be most interesting. Thank you for making the videos, Professor!
Good ideads but "current-mode flybacks (the Weinberg converter)" ?
@@sambenyaakov One of these: ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20020083039.pdf
Helpful video. I liked it
Thanks
amazing
Thanks
thank you very much for your impressive explanations on all your lectures.
would you please elaborate on the two switch ''flyback'" topology which is frequently used in the 400w range of power 12v pfc power supplys
used in server and network switch applications.
Thanks. Good subject. I will consider preparing a video on that
Hello Professor, thanks for making such an insightful video. I really learn a lot from your videos. Here in this video at 0:46, the peak current shown in Ton and Toff time is different. Please help me understand the cases where in the peak current will be different. To my belief, the inductor will not allow sudden change in the current, please enlighten. Thanks in advance.
Common misconception. At the transition, I1N1=I2N2 .Sudden change is not possible in the core magnetization, not the currents.
Hi Sam thank you very much for your informative lecture. You say DCM core can be smaller because we can increase the switching frequency. However what about core losses in DCM its much higher than CCM because of high dB which could be a limiting factor that force the designer to increase the core size leading finally to lost DCM advantage ending up with similar or bigger core than CCM. Am I right?
Good point. But, if you keep same deltaB, losses increase per cm^3 so if the size is smaller total loss is reduced. But of course, there is the issue of thermal resistance. So each case has to be dealt with properly. Thanks for comment.
But what i never understand: why not use doublesided rectifiing? Would you not get the most power trough a core when it not has to store all of the energy from each half cycle instead of using the bit from other half too? Or is it only for making the pwm regulation easier?
If you double rect is not anymore a flyback or is.an hybrid like flyforward
Indeed, the transformer of a forward converter does not store energy. But per Murphy law, that converter has its share of problems, the transformer will not be appreciably smaller than the Flyback and you need an inductor at the secondary.
What about de EMI filter? should it be larger for DCM compared with CCM of same power?
Very good point I should have pointed out the the EMI in DCM is worse,. Thanks. Hope others will see your comment.
@@sambenyaakov thanks for your reply, I'm very fan of your videos.
Your videos are very useful to me, have you considered starting an account on Patreon or other similar platform? I am much willing to contribute.
Hi Ivan. Thanks for suggestion. At this point I am enjoying the sharing for free.
Hi Sir. I have to say something contradictory.. Usually the Core size of DCM is smaller than CCM, since CCM has a shifted remanence... Ripple current nothing but ripple flux density too..
Smaller? On what basis? Can you show me a DCM CCM magnetics designs of same power, efficiency and frequency in which the DCM is smaller size? This is an urban legend.
@@sambenyaakov Ha ha.. For a DCM how much swing on fux you can expect? 0 to 0.3? In CCM it may be from may be 0.1 to 0.3.. So without any flux swing there is nothing.. And hope you know energy density B^2/2u.. You have smaller energy density if you want to operate in CCM. Energy density nothing but its energy capability / volume. So more volume if energy density is less, so bigger core..
@@sambenyaakov And because of the high rms current you can say, need thicker wire.. But its not related to core size.. Thats why the area product method is not valid in case of inductor design, Its still useful in case of transformer since there is small amount of energy storage each cycle... For inductance or energy storage should be based on the core volume...
If you need thicker wire the winding window is larger and Ap larger. Unless you have bad non economical designs which do not use all Ap so both CCM and DC magnetics are wastefully large.
@@sambenyaakov Okay. Indeed.. But this we can say if the both flux swing are in same amplitude.. But its not. And for area product is inverse to flux swing, smaller flux swing will have more AP.. ( still AP is not based on core volume, which defines the energy handling)