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

Will Matney xformer at citynet.net
Sat Jun 25 20:24:21 EDT 2011


Yes, it works just as well. I have seen companies use this to make tube
bias supplies, when all the windings wouldn't fit on one transformer. They
would use the filament supply, and tie the 6 or 12 volt coil of a smaller
transformer to it, then use the 120 vac side as the bias supply. Also, they
do something similar to this in making a double-isolation transformer, by
just using two transformers tied together this way.

There are losses, of course, I^2 R, etc, but it still works well in the
end. The inverter I constructed, used a 24 vac, center tapped, transformer,
making 12 Volts for each 1/2 coil, and fed the center tap with 12 Vdc. The
switching transistors connect to each end of the winding, and merely switch
the current to ground. It's really the same way they made the old vibrator
supplies years ago, except they ran at a higher frequency so they could get
the transformer size down for automotive radios. After that, they switched
from vibrators to Germanium transistors to do about the same thing, except
added bias windings. About all you need to add, besides the transistors,
are snubbers to kill the spikes, and an oscillator/driver.



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On 6/26/2011 at 10:03 AM Neville Michie wrote:

>An interesting question about making a 50/60 hertz source,
>Does a 120 to 12 volt transformer have enough inductance to use as a  
>12 to 120 volt transformer?
>Remember, the inductance is proportional to the square of the no of  
>turns, where as voltage is proportional.
>Neville Michie
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