Electronics > Projects, Designs, and Technical Stuff
ATX Flyback Transformer
engrguy42:
--- Quote from: Buriedcode on June 16, 2020, 02:19:11 pm ---
--- Quote from: engrguy42 on June 16, 2020, 02:10:20 pm ---Anyway, as you can see the secondaries of this transformer have a crap-ton of Schottky's on a big heat sink. Anyone know what those are for?
These things are so freakin' complicated...
--- End quote ---
Maybe start at the basics of the topology. The fact you used 60Hz on a ferrite transformer shows you've made assumptions that aren't true (and worked that out!).
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:-//
:wtf:
Anyway, these Schottky's are made by STMicro, and I found a nice paper from them describing their use in this case.
engrguy42:
OOooooo....some yummy LTSpice SMPS transformer switching goodness.... :D
mariush:
My advice would be to look a DiodeGoneWild's youtube channel, he has some videos explaining atx power supplies and how they work.
engrguy42:
Thanks, mariush. But for me personally, if I'm going to really understand something as complicated as a decent ATX power supply, a 10 minute video isn't going to do it.
My long term plan is to take an actual spare power supply and, component by component, test it and characterize it, then model it in LTSpice. I already have the front end modelled (input filtering, bridge, etc.), and next I'm trying to tackle the main transformer.
IMO, it's so much better to have an actual software simulation model of actual hardware that you can try things out on and do simulations and "what-if's" and test on the bench. And in this case, I already have a schematic that seems to be almost identical to the actual hardware, so it's a whole lot easier to reverse engineer.
BTW, if anyone really wants to understand down on the engineering level how a lot of this stuff works, you might consider the videos of Sam Ben-Yaakov. He's an EE professor (he also writes tons of IEEE papers) with some really in-depth explanations of this stuff.
Anyway, I guess I don't want to be a "10 minute video expert". There are more than enough of those out there. :D
Gyro:
--- Quote from: engrguy42 on June 16, 2020, 06:14:11 pm ---Thanks, mariush. But for me personally, if I'm going to really understand something as complicated as a decent ATX power supply, a 10 minute video isn't going to do it.
My long term plan is to take an actual spare power supply and, component by component, test it and characterize it, then model it in LTSpice. I already have the front end modelled (input filtering, bridge, etc.), and next I'm trying to tackle the main transformer.
IMO, it's so much better to have an actual software simulation model of actual hardware that you can try things out on and do simulations and "what-if's" and test on the bench. And in this case, I already have a schematic that seems to be almost identical to the actual hardware, so it's a whole lot easier to reverse engineer.
BTW, if anyone really wants to understand down on the engineering level how a lot of this stuff works, you might consider the videos of Sam Ben-Yaakov. He's an EE professor (he also writes tons of IEEE papers) with some really in-depth explanations of this stuff.
Anyway, I guess I don't want to be a "10 minute video expert". There are more than enough of those out there. :D
--- End quote ---
Sounds like you need to stop asking basic questions and go and get on with your modelling then. :)
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