On Fri, 28 Sep 2018 21:11:39 -0400, John H.
wrote:

Inverters ultimately have only one job – take in DC current and turn it into AC current. In theory,
this is very easy, because a simple switch and some creative wiring can give you an alternating
square wave operating at the frequency that you flip the switch.

But in reality, square waves are very damaging to nearly all modern electronics that rely on AC
power. So the real question is: How do you take AC power and turn it into something useable? The
answer is, you can filter the square wave using precisely selected inductors and capacitors to
create a sine wave, or at least something close to a sine wave.

===

Modern day sine wave inverters use high frequency switching logic to
approximate a sine wave with only minimal filtering required.