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Data centers are transitioning from AC to DC

spectrum.ieee.org

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Re: Data centers are transitioning from AC to DC

#431
post #428
post #410

Earlier quoted context omitted.

You mean the ethernet cable in my laptop? Couple of times a day. The box under my desk? Often? How about the hundreds of devices I work with that have RJ45 connectors for serial access? All the time? Are you seriously telling me you hold up a (decently made) ethernet cable next to a USB-C connector and think "yeah...the one a fraction of the size of the other is obviously mechanically stronger". Is this some Apple sh…

No, but looking at the two side by side, I do think that the one with a fragile clip that shears off every time somebody trips on it is going to be more of a problem than the friction fit one that will just come off.

As opposed to the one that has no clip to hold it in, and shears off the whole connector when you trip over it. And I can use the ethernet cable without the tab.

Some people will embrace any absurdity to pretend to be right.

Re: Data centers are transitioning from AC to DC

#432
post #388

Earlier quoted context omitted.

We go -48 -> 48 -> 12 -> 3v3,1v8 etc etc. If you went 48 straight to POL voltages then you would have horrific converter performance.

I was just looking at these funny parts: https://www.vicorpower.com/products?productType=cfg&productK... 130A, 48V -> 1.2V @ 94% efficiency! Except: - $100 ea. - Fixed 1/40 voltage ratio, regulation done by upstream regulator. - Look at the minimum specs for efficiency…

This is a very strange part, what with the upstream regulator circuit.

My guess is that their efficiency stats dont include losses in the upstream regulator.

100 usd per unit doesnt seem that excessive.

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