Snubbers are Important.
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- Опубліковано 5 сер 2024
- We didn’t implement an appropriate snubber on our push-pull converter because leakage inductance of our transformer was not considered correctly.
Can we get a snubber on this board somewhere to get us back up and running?
Spoiler alert: Molten Solder & 200W.
Next topics:
Push-Pull & Inverter Performance Testing.
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You are so engaging and captivating! I wish I had a teacher like you in school. I want to see more!
Hi Frank! Thanks for watching, and thank you for the words of encouragement! I'm glad that you found us!
I totally understand your frustration, and in fact, that's a BIG part of why we started this channel. I can't wait to share the next parts of our UPS project with you! We've got some AWESOME videos coming up on power electronics.
Such a thorough explanation.
Thanks and well done. Keep up the work.
Thank you Celebrimbor101, I'm glad you enjoyed, and thank you for watching!
I recently discovered your channel. I love it! Subscribed.
Welcome Miguel, I'm so glad you found us, and thank you for the compliment. :) I hope to see you around the comments more often!
Hey, thank you. It's interesting. Could you give us example how to choose components for snubber in market? Like what type of capacitor we should buy, etc.
Rise and shine, Dr Freeman. Wake up and smell the ashes.
Hello Buck! I think... That means.... You... Liked it? Lol. Thanks for watching, and welcome! First comment... I think. :)
would you please help me with designing of snubber for push pull?
Thank you for great explanation! Can you give us some explanation on the designing of the Snubber for IGBT circuit?
Hey artyman, thanks for watching, and I'm glad you enjoyed!
The great news is that designing a snubber for an IGBT circuit... isn't really different than designing a snubber for anything else!
TI has a lot of great appnotes on the subject, especially for R-C snubbers. e2e.ti.com/blogs_/b/powerhouse/archive/2016/05/05/calculate-an-r-c-snubber-in-seven-steps
Here's one where they walk through the design process for an RC snubber that they're applying to a DC-DC SMPS... but the theory is fundamentally the same. www.ti.com/lit/an/slua851a/slua851a.pdf
I hope this helps, or at least, gets you started!
Rather than dissipating this energy as heat in the passives ... is there a way to re-claim and capture this energy, rectify it, and feed it back into the input -- sort of like regenerative braking?
Hello, great question! In theory, that should be possible, but there is a problem. If a diode or fet rectifier could turn on fast enough, there shouldn't be any energy to snub! So this circuit is only managing the energy due to the silicon not conducting right away.
So, I guess if you have a main rectifier, and a smaller, faster rectifier... Maybe!
How to calculate rc snubber circuit
Hi man
Thanks for the valuable explanation
I need to know when to go for a rc snubber and when to use a diode in free wheeling mode.
Many internet and text book designs involving an inductor driving transistor is using a diode clamp either in anti parallel with the element or the inductive load.
If diode is enough ...Then why snubbers are used ? And when they are used ?
I have the same questions as you.
Could someone please answer these questions?
Awesome vid once again.. ever though of using a bifiller wound primary connected antiparallel..?
this will increase you primary side capacitance / lower its self resonant frequency and will store the spikes inside the high self capacitance of the windings them selfs like a shock absorber. this way you dont need snubbing cap either.. i used this in DC pulse resonant systems before and it worked like a charm..
Hello ff ff, Thank you for the idea! That's crazy smart - use the parasitic to your advantage instead of fighting them! Bifilar connected antiparallel is a great choice, especially because we were switching such low voltages on the primary side. Thank you for the tip, and thanks for watching!
@@EEforEveryone " use the parasitic to your advantage instead of fighting them!"
exactly :)
keep up the awesome channel!!, perfect balance between theory and practice if you ask me
!
You deserve so many more views than this
Hi Orlando, thanks for watching, and I'm glad you think so. We have some great videos coming up that I'm really excited about (About the next version of this design).
I hope to see you around the comments more often! Cheers!
@@EEforEveryone Well hopefully a snubber will help for me, Trying to build my self a high voltage flyback converter (6-5,000v) but seem to blow up my mosfets within a few seconds(probably inductive spikes from the coupled inductor), might need to redesign.
@@orlandoluscombe3008 Ha! Yeah... sounds like you've got one heck of a turns ratio going on. :) Sounds like a great project! Keep at it, and I hope you work out the details soon!
... "I think there's something wrong with our implementation"....??? Hey I just came here, this is all on You !!!
Jokes aside thanks for a nice explanation of the function of snubber's, which was why I came here... But I still watched the full video because ""my momma brought me up right"" :)
Best regards.
AHAHAH! I love this. :) An awesome joke, I had a good laugh. Thank you for watching onlyeyeno, I hope to see you around the comments more often!
You are awesome dude. I just want a favour please make video on designing power stage for motor controllers in which discuss about each and every thing like snubbers, parellel mosfet configuration, dc link capacitor, pcb design for high volagates, etc. Please take this into consideration.😃
Hello! Thank you for watching. I think you're awesome too, and I'm glad that you like what we do. When you say motor controllers, do you specifically mean a brushless motor controller? I'll enjoy talking about all of those things, but I don't know if I can cover it all in one video. :) Hopefully you learned a couple things about snubbers in this video that can help you!
We're in our next design cycle right now, and all of these topics will be involved. Thankfully, the DC link capacitor for a motor controller is very similar to input capacitance for a regular switching power supply, so the calculations are very similar. I'll make sure take some time to discuss parallel Mosfets, high voltage PCB design, and sizing input capacitance as we work through these parts of our design.
I'm curious, do you have any specific questions about snubbers that we didn't cover in this video? I know it was pretty high-level, so perhaps I didn't break the theory down into understandable chunks well enough.
I'm looking forward to your feedback, and thanks again for being a part of this community!
@@EEforEveryone your explanation skills are of another level dude. I love the way to explain complicated things in very simple manner. The snubber video is very informative and complete. I am just saying that you can make a video series in which you can talk about designing a high power motor controller power stage (brushless) and talk about these things. Because no one on youtube provides that deep information about these things.
Wow, Thank you for the kind words! I certainly try to be easy to understand. Hmmm... A brushless motor controller could be fun, and it's been a while since we did something for our small projects series. Are you most interested in Sensor-ed or Sensor-less control, and are you at all interested in writing firmware for motor control? You have "Arduino" in the name... So why don't we make this an Arduino-Compatible Shield? :) There are plenty of other dev kit vendors that are using the Arduino shield form factor as well. Could be good! What do you think?
Circuit design can take a little while, so if you're itching for something to get your hands on before we can design our own, you may be interested in this dev kit: www.st.com/en/evaluation-tools/steval-spin3201.html#overview
I'm not always a huge STM32 fan with regards to software development... but they made a pretty awesome dev-kit for BLDC control. They have a PC tool for characterizing motors and building Field-Oriented-Control parameters as well, though I'm not sure if this is exactly the right dev kit for that tool. I think it is!
@@EEforEveryone stm32 board looks good for small application. But the main thing i am looking for is the power stage. I want to grab knowledge about isolation for high current application , MOSFET'S package limits, how to calculate gate drive resistor , and each and every detail need to design power stage. Because i am currently working on stm32 based foc controller and want it to open source thus controller part is complete and i have very less amount of knowledge about power electronics and not enough resources available online. I am requesting you to teach us how to do this thing.
In actual my motive is to give diy EV community a platform for design and develop foc based controller on there own using my design and customise according to their need.
I need your help. There's a UA-camr who has a very popular channel called DazeCars. He's been doing a series of DIY videos on salvaging treadmill motors and their associated controllers for powering tools and other machines. He just came out with a recent video where he discourages adding a flyback diode to for circuit protection because a bad it can destroy the motor. He claims the MC-2100 treadmill motor controller sucks because it burns out whenever it's turned off suddenly or when the direction is switched. These sounds like the symptoms of an inductive spike. Perhaps, you can settle the issue by addressing it with video. It would be a great way of attracting more viewers. At the very least, you could leave a comment on his video. He admits to not being an engineer, yet disagrees the voltage spike is a problem.