Electronics > Projects, Designs, and Technical Stuff

ATX Flyback Transformer

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nctnico:

--- Quote from: mariush on June 16, 2020, 04:35:13 pm ---My advice would be to look a DiodeGoneWild's youtube channel, he has some videos explaining atx power supplies and how they work.

--- End quote ---
But these videos look like they are from flyback power supplies and not forward converters. With some Googling you can find good tutorials on how forward converters (and thus many of the ATX power supplies) work.

engrguy42:
DAYUM !!!!

So I thought this power supply I put together was, well, probably kinda wimpy. Yeah, I hit it with a couple amps and it just had a tiny blip then back to flat 12VDC. But I figured if I hit it with more power it would probably explode in a flaming mass of LTSpice metal.

So I figured, "okay, just for grins let's hit it with some real power". So I did a simulation with applying 6 amps/72 watts to the 12VDC output. It probably wouldn't survive the initial dip.

And how did the power supply respond??

It replied "HA !!! I sneer and spit on your measly, wimpy 72 watts !!!"  :D

DAMN, this thing is a MONSTER  :D

A brief hiccup for 10mSec or so, then a nice smooth recovery back to a totally flat 12VDC. And Ith is still hanging below 2 volts after about 0.1 second.

I'll let it run for a while, but it appears like we have a winner. It looks like tuning the switching transformer is a key component in all of this, so now I have to figure out why it worked so well.

engrguy42:
And after letting this run overnight, here's the result of a 0.5 second simulation. Some ripple starts at 100mSec after applying load, and it's 120Hz and about 0.25V pk-to-pk.

engrguy42:
Okay, well this is INSANE !!!

This little 12VDC power supply I kludged together is an absolute BEAST !!!

This time I slammed a 12A, 144watt load on the 12VDC output, and it did a nice, smooth recovery, and settled at 11VDC with some ripple.

Damn. This is crazy.

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