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Super Flower 1200W ATX PSU powerline noise ??

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MathWizard:
I had an old 850W PSU, and there's about a 14W LED bulb plugged in, on the same circuit as my PC and stereo. It never really flickered before.

But then I got a new Super Flower Leadex 1200W 80+ Platinum PSU, and as soon as the PC is running, the bulb flickers. On a 3.5D DMM, the voltage goes from about 117.3VAC to about 116.3VAC, when the PC is on. It moves up/down a bit, with the PC on or off though.

The flickering is more like a few times a sec/ or not much faster. It's fairly annoying, I'll try some other bulbs. I guess there's not much else I can do, these bulbs are too hard to take apart anyways.

So is it bad light bulb design or bad PSU design? How much sub 60Hz noise is allowed ? I'm tempted to drag the scope over had have a look.

Geez these are safety plugs tho, it was a pain to get DMM probes in the slots, and to find contact.

thm_w:
Is it a quality brand LED bulb?

Interesting that it got worse, you'd think the high quality PSU would have good PFC and not cause large draw. But, did you just change the PSU or does your PC now draw a lot of power too?

MathWizard:
No it's the same PC, and happens when idling, and together with the stereo, they probably use under 150W. I never paid attention to the light when I was gaming, but those games don't use that much power either, (my PSU is overkill, but not at the great price I got it, and it's for an i9-14000KF and RX 7900 xtx)

The bulb is a non-dimmable 8.5W type, not a big brand name but from a big supermarket, so legit. Of the couple I tried, they both flicker. I tried a working Sylvania 13W compact florescent, it flickers a bit, but not nearly as bad as those LED's. I wonder how bad an incandescent bulb would be. I still want to check the voltage with my scope too.

macboy:
Smells like badly designed PFC in that new PC power supply.

MathWizard:
Well I finally looked at it with a scope, plugged in on the same breaker, w/ 50x differential probes, and I can clearly see the line wiggle when the main PSU turns on. The pk-pk is always growing and shrinking a bit, as my SDS2204x+ updates on 10ms/div. Taking a few screen shots, and scrolling through them, it's easy to see it change.

The STBY power doesn't do it.

I tried to measure some stuff, but IDK how useful it was, since the average line voltage moves around over the minutes too. Maybe late in the night, I can get to good tests back-to-back.


But really, what can be done, without taking apart the brand new PSU ?? Would it be defective ?? Overall these are way too complicated for me to know what to change, but can the input filters be changed any ? Or can I plug it in to an external filter of any type that would help this ??

So far I can't say I've seen the flicker any better/worse, when the PSU was under a heavy load.

Here's about as detailed a tear-down that exists. The fan is control is pretty annoying, I'm already tempted to void the warranty just to alter it's control.
https://www.techpowerup.com/review/super-flower-sf-1200f-14mp/4.html

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