[time-nuts] The home time-lab
kb8tq at n1k.org
Mon Jul 25 09:55:18 EDT 2016
If you go back far enough in time …. there is another alternative:
Big rectifier bank, turning AC into DC, often off of multiple phases or sources.
Big DC motor running into a fairly large flywheel.
AC generator (or in some cases DC generators) running off of the shaft
A tuning fork (yes state of the art timing) based control on the AC output frequency
A saturated reactor control loop on the generator side, same thing on the motor side.
Wonderfull stuff. State of the art UPS for your shipboard computer in 1962. Ear muffs anyone?
> On Jul 25, 2016, at 8:39 AM, Charles Steinmetz <csteinmetz at yandex.com> wrote:
> Chris wrote:
>> I've never thought UPS were a good idea for anything but a computer
>> that needs to shut down gracefully. For your use you need something
>> that cleans up the AC mains power.
> A proper "online" (or "double conversion") UPS does just that. It always provides cleanly-generated sine-wave power from a DC-AC converter. Most will even deliver crystal-controlled power (i.e., non-synchronous with the AC line) in several frequency increments, if you desire, as well as a choice of regulated output voltages. (For obvious reasons, they are usually operated synchronously.)
> They are *much* more effective than ferroresonant supplies at removing glitches from the mains supply.
> You must be referring to "offline" backup supplies.
> Best regards,
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