[time-nuts] No more 60Hz, How do I discipline 120VAC 60Hz from a UPS

[J. Forster]

If I were tasked with this job, I'd buy an older UPS of adequate size for
your load, with the ability to use external batteries, that puts out
either sine or modified square waves. Older, because the controller will
be easier to modify.

BUT, before purchase, I'd make sure that, at least, a schematic is available.

IMO, the easiest route is a modified UPS. The biggest task will be getting
the prints.

FWIW,

-John

==================


> Don,
>
> The easiest way would be to convert the line voltage to make a 12 Vdc
> source, then use an inverter that you can add a xtal control to its
> oscillator, or even add a GPS disciplined source to drive it. However,
> that
> won't help with power outage, unless you would use a UPS, or maybe a
> generator that will kick in when the line voltage starts to drop. The
> transformer to use is a simple 24 Vac, center tap secondary, that you then
> use as the primary, and drive it with 12 volts on either side with the
> oscillator. You feed the center tap with 12 Vdc, and switch the two outer
> legs to ground via transistors or FET's. The secondary is what was the 120
> Vac primary, and you have to source for the clocks.
>
> I built a 60 Hz inverter a few years back, and it didn't really require
> much. I can't recall the chip I used for the oscillator, but it did work,
> and it gave me 60 Hz like I wanted. Most cheaper inverters, if I remember,
> run at a higher frequency than that, which are now sold on the market.
> They
> do this to get the transformer size down.
>
> While you're at it, you might want to check the motors loaded rpm in those
> clocks to see how accurate they are.
>
> Best,
>
> Will
>
> *********** REPLY SEPARATOR  ***********
>
> On 6/25/2011 at 9:50 AM Don Mimlitch wrote:
>
>>I collect clocks an have many clocks with 60Hz Synchronous Motors.
>>
>>How would I go about Disciplining a 60Hz 120VAC source from an
>>Unintteruptable Power Supply (UPS)?
>>
>>This would solve both my problem with power outages and the new problem
>>of possibly undisciplined power from the power companies (Henry Warren
>>must be rolling over in his grave!)
>>
>>I have no Idea how you would disciple such a low frequency at such a high
> voltage and
>>deliver the power required to drive several (or many) Clocks.
>>
>>I assume you would start with a commercially available UPS and either a
> disciplined 1 Second
>>
>>or 10Mhz source such as a thunderbolt (also powered off the UPS or the
> batteries in the UPS).
>>
>>Does anyone have an suggestions for circuits which would do this
> disciplining?
>>
>>Thanks
>>Don
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