Yes, "ferroresonant" is also called CVT. Typically rather than buying just the transformer you buy a box that has one in it but also some other components to clip spikes (some MOVs) and and LC low pass filter. I know it seems a saturated core might produce a non-sine wave but current CVTs have very low distortion.
The other option is an on-line UPS, one that always runs off the battery. These are expensive if you need a good sine wave output. The UPS has an output stage not unlike an audio amplifier. Not nearly as efficient as MOSFET switches. (question: I'd guess that modern versions would be designed with class-D output stages and have decent power efficiency??) The best solution is what the phone companies did. The telco style equipment, like computers and such runs off 48VDC. and batteries are connected in parallel from a "battery room". If designing your own GPSDO, it should be built to run of 12V battery power. For AC the best solution is a motor generator. Basically an iron flywheel rides out any small dropouts in the utility power. They had one for a mainframe computer at a place I worked at a long time ago. But only that one output 280V at 400Hz as the computer required 400Hz power. On Mon, Jul 25, 2016 at 2:43 AM, David J Taylor <david-tay...@blueyonder.co.uk> wrote: > Chris, > Do you mean like these: > > http://www.aelgroup.co.uk/products/agt.php > > I have an old 75W unit somewhere.... > -- Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.