Thank you for mentioning magnetic amplifiers! In the 80s, there were still lots of those in the Navy equipment I maintained. When I got to college and mentioned them, they weren't even footnotes in our textbooks. Big, heavy, and expensive, but reliable and rugged technology from 100+ years ago.
There are actually two types of circuits with isolated outputs. 1.) The transformer kind, which is most usual. 2.) The Y class capacitive couple, which is less common for some reason but essentially it replaces the transformer in a normal isolated SMPS with a class Y capacitor. Most transformer based SMPS use 1 class Y safety capacitor anyways so instead of using a transformer you could just use another class Y safety cap to transmit power to the isolated output. It’s worth noting that this only isolates DC and low frequency AC, but there are virtually very few circuits capable of high frequency AC isolation.
Excellent! I imagine most hams like myself, would love to understand exactly what it is in switching circuits that creates broadband EMI, and how to mitigate it. 🙂
10:28 cross regulation, this is the reason why most ATX power supplies today use an LLC or PSFB converter with 12V output and then step-down to 5V and 3.3V and generate -12V from the same 12Vmain rail, today's PC loads have high power excursions so maintaining regulation with a multiple output winding transformer was not feasible anymore. excellent video, thank you! :)
Did you even look? The entire Power Electronics course, from University of Colorado is on UA-cam. There's lot of other very detailed videos about SMPS design, and power electronics. Dr. Sam Ben Yaakov's channel will take you to graduate level SMPS, and magentics design, and isv ery very well done. It's amazing the level of SMPS design knowledge that is available on UA-cam that you'd only get in an electrical engineering degree otherwise.
Two interesting things about many modern computer power supplies. First is the Active Power Factor Correction. Which is really a boost converter to charge the high voltage capacitors. Second is, for efficiency reasons, many power supplies have gone to only producing 12V, and then using buck converters to bring the voltage down. So a modern PC power supply has three different stages in series to provide the 5V and 3.3V output.
Switching power supplies are fascinating. I've repaired a broken power supply from my PC and I found there another interesting way of controlling the 3.3V output. They were using a synchronous rectifier on the 3.3V rail unlike on 5V and 12V.
Hello, Can you make a inductance meter which can be accurate to design inductors for such converters ? using Arduino or stm32 ? I have tried many circuits on the internet but they seems to be inaccurate.
FesZ, when are you going to publish an book on power electronics? Sounds like a great PHd thesis. Thank you for the outstanding videos on power electronics design.
Want to see the individual designs of all commonly used converters from scratch on this channel. From components/ IC selection, simulation, performance analysis, stability etc. Specifically for FLYBACK CONVERTER. I still don't understand the selection of IC, Transformer and loop stability.
Thank you for the video. Could you make a video about connecting 2 pcbs with long cable for power and data communication and the issue we may face and how to solve it? Like inductance from the cables and filtering power... Thanks again.
@Fesz Electronics. At about 0:34 you said, "Unlike a linear power supply where the output is always smaller than the input voltage..." I just can't tell how my Grandpa's old Crosely gets the 300 volts for the B supply, from 120VAC, here in the mental wilderness, of North America.
Thank you for mentioning magnetic amplifiers! In the 80s, there were still lots of those in the Navy equipment I maintained. When I got to college and mentioned them, they weren't even footnotes in our textbooks. Big, heavy, and expensive, but reliable and rugged technology from 100+ years ago.
I also found this subject very interesting! I did not really know anything about magnetic amplifiers before doing the research for this video.
There are actually two types of circuits with isolated outputs.
1.) The transformer kind, which is most usual.
2.) The Y class capacitive couple, which is less common for some reason but essentially it replaces the transformer in a normal isolated SMPS with a class Y capacitor. Most transformer based SMPS use 1 class Y safety capacitor anyways so instead of using a transformer you could just use another class Y safety cap to transmit power to the isolated output. It’s worth noting that this only isolates DC and low frequency AC, but there are virtually very few circuits capable of high frequency AC isolation.
Excellent! I imagine most hams like myself, would love to understand exactly what it is in switching circuits that creates broadband EMI, and how to mitigate it. 🙂
10:28 cross regulation, this is the reason why most ATX power supplies today use an LLC or PSFB converter with 12V output and then step-down to 5V and 3.3V and generate -12V from the same 12Vmain rail, today's PC loads have high power excursions so maintaining regulation with a multiple output winding transformer was not feasible anymore. excellent video, thank you! :)
Thank you for that video ! It's rare to see a video about power electronics with that detail !
Did you even look? The entire Power Electronics course, from University of Colorado is on UA-cam. There's lot of other very detailed videos about SMPS design, and power electronics. Dr. Sam Ben Yaakov's channel will take you to graduate level SMPS, and magentics design, and isv ery very well done. It's amazing the level of SMPS design knowledge that is available on UA-cam that you'd only get in an electrical engineering degree otherwise.
A lovely way to start my Sunday - coffee and FesZ
I just came in to give you a thumb up, your videos helped me a lot in the past.
Outstanding!!!!!Please make video on SMPS transformer and inductor design and more videos on smps
Two interesting things about many modern computer power supplies.
First is the Active Power Factor Correction. Which is really a boost converter to charge the high voltage capacitors.
Second is, for efficiency reasons, many power supplies have gone to only producing 12V, and then using buck converters to bring the voltage down.
So a modern PC power supply has three different stages in series to provide the 5V and 3.3V output.
Will you do a video for each smps topology ? That would be fantastic ❤ you are the best teacher
Switching power supplies are fascinating. I've repaired a broken power supply from my PC and I found there another interesting way of controlling the 3.3V output. They were using a synchronous rectifier on the 3.3V rail unlike on 5V and 12V.
Hello, Can you make a inductance meter which can be accurate to design inductors for such converters ? using Arduino or stm32 ? I have tried many circuits on the internet but they seems to be inaccurate.
Another great video. Thanks! 😊
FesZ, when are you going to publish an book on power electronics? Sounds like a great PHd thesis. Thank you for the outstanding videos on power electronics design.
Thnks
Want to see the individual designs of all commonly used converters from scratch on this channel. From components/ IC selection, simulation, performance analysis, stability etc. Specifically for FLYBACK CONVERTER. I still don't understand the selection of IC, Transformer and loop stability.
Yessss
But I love the saturable inductor regulator. I understand why it's obsolete but to me it always was the most fascinating part of ATX supplies.
Could you please cover linear regulator stability
Yes, can you please make a video on the subject
Thank you for the video.
Could you make a video about connecting 2 pcbs with long cable for power and data communication and the issue we may face and how to solve it? Like inductance from the cables and filtering power...
Thanks again.
@Fesz Electronics. At about 0:34 you said, "Unlike a linear power supply where the output is always smaller than the input voltage..." I just can't tell how my Grandpa's old Crosely gets the 300 volts for the B supply, from 120VAC, here in the mental wilderness, of North America.
There should be an AC transformer in there - with that you can get any in to out voltage ratio
Hi Fesz Electronics... thanks I'll tell grandpa.