On Sun, 25 Oct 2015 11:50:51 -0700 (PDT), westom
wrote:

On Saturday, October 24, 2015 at 12:22:12 AM UTC-4, Muggles wrote:
Dual conversion?

What dual conversion does is already inside your electronics. Part of the process of converting 120 VAC to well over 300 volt radio frequency spikes. And the converting that to stable, low voltage DC for semiconductors.

Anything that dual conversion might do is already inside electronics.
Yes and no - and depends.
A switch mode power suppliy functions somewhat as you describe, but
does not have as high an isolation voltage. Switch mode power
supplies are more resistant to or accomodating of surges than linear
supplies - to a point. And not all electronics use switch mode power
supplies - even today. The better stuff does - and the better stuff
is less likely to be damaged by minor to intermediate surges and
spikes.

As with anything, multiple layers of protection are generally more
effective than single layers - and cheap standby UPS units are no
better than a plug-in surge protectesd power bar, while dual
conversion units provide REAL protection.