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From: Martin Brown <'''newspam'''@nonad.co.uk>
Newsgroups: sci.electronics.design
Subject: Re: UPS [Was:Re: Grand Apagon - Electricity (not) in Spain]
Date: Thu, 8 May 2025 15:18:07 +0100
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On 08/05/2025 14:41, Carlos E.R. wrote:
> On 2025-05-08 14:44, Carlos E.R. wrote:

>> UPS Topology: Standby (Offline) or Standby (Offline) 
> 
> {Phrase translated by DeepL, so inconsistent: Topología UPS: En espera 
> (Fuera de línea) o Standby (Offline)}

There are (at least) two major UPS topologies in play.

One is where the power to the protected device is always made by the 
inverter and maintained at the correct main voltage irrespective of 
input voltage to the UPS. Useful in places where the local mains supply 
voltage goes up and down a lot depending on load.

The other is a pass through of input mains voltage to the load under 
normal conditions and an isolation relay plus cold start of the inverter 
within a couple of cycles of the supply failure. This is more than good 
enough for PCs. Mine can withstand a 1s blackout unprotected without any 
difficulty but kitchen white goods clocks cannot.

> I do not see a reference to that "topology" except at the vendor. But it 
> says that the expected battery life is 4 years.



-- 
Martin Brown