From: already5chosen@yahoo.com   
      
   On Fri, 26 Sep 2025 12:10:41 -0000 (UTC)   
   Thomas Koenig  wrote:   
      
   > BGB  schrieb:   
   >   
   > > Brings up a thought: 960VDC is a semi-common voltage in industrial   
   > > applications IIRC.   
   >   
   > I've never encountered that voltage.  Direct current motors are   
   > also mostly being phased out (pun intended) by asynchronous motors   
   > with frequency inverters.   
   >   
      
   Are you sure?   
   Indeed, in industry, outside of transportation, asynchronous AC motors   
   were that most wide-spread  motors by far up to 25-30 years ago. But my   
   imressioon was that today various type of electric motors (DC, esp.   
   brushlees, AC sync, AC async) enjoy similar popularity.   
      
   > > What if, opposed to each computer using its own power-supply (from   
   > > 120 or 240 VAC), it uses a buck converter, say, 960VDC -> 12VDC.   
   >   
   > That makes little sense.  If you're going to distribute power,   
   > distribute it as AC so you save one transformer.   
   >   
      
   I never was in big datacenter, but heard that they prefer DC.   
      
   > >   
   > > Or, 2-stage, say:   
   > >    960V -> 192V (with 960V to each rack).   
   > >    192V ->  12V (with 192V to each server).   
   > >   
   > > Where the second stage drop could use slightly cheaper transistors,   
   > >   
   >   
   > Transistors?   
      
   Yes, transistors. DC-to-DC convertors are made of FETs. FETs are   
   transistors.   
      
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