[time-nuts] The home time-lab

Brooke Clarke brooke at pacific.net
Mon Jul 25 13:18:44 EDT 2016

Hi Bill:

I have links to the Sola patents at: http://www.prc68.com/I/Sola_CVS.html#Patents
The 1939 patent shows a single gap and the resonant circuit, but the current patent (number on Sola xformer label) shows 
two gaps and the resonant circuit.
They specify up to a 3 ms dropout restoration which implies the amount of energy stored is enough to last that long.

A full time UPS (one where the line is converted to battery voltage then battery voltage is converted to a sine wave) 
could be expected to have a clean output.
But a relay switched UPS, like mine, does nothing to the line waveform, so the Sola offers a lot of improvement.

Since the Sola does not help getting a sine waveform, it may be better to put it on the input since that might make 
dropout detection more reliable?

Have Fun,

Brooke Clarke
The lesser of evils is still evil.

-------- Original Message --------
> Years ago I knew exactly how Sola regulators worked. That has faded, but
> what remains is that the regulation was done by varying the saturation
> of the core. That's why there is a slot in the laminations. I find it
> hard to believe that a partially saturated core can produce zero
> harmonics.
> In any event, the LC circuit does not filter anything. Possibly the
> circuit counteracts the change in saturation as the line voltage
> changes. I wouldn't expect it to effect the high frequency components of
> spikes.
> Any power supply that has a diode bridge and capacitor to create DC only
> draws power from the line at the voltage peaks, when the diodes become
> forward biased. I don't know of any choke input supplies, as were used
> to reduce the peak current of vacuum tube rectifiers.
> I know nothing about power factor correction for a bridge and capacitor,
> whether or not it is followed by a switching regulator.
> Make of it what you will.
> Bill Hawkins
> -----Original Message-----
> From: Alex Pummer
> Sent: Sunday, July 24, 2016 7:29 PM
> That is interesting, since the Sola device has a to the line frequency
> tuned tank circuit in it, thus the output should not have to many higher
> harmonics and should look reasonable close to sinusoidal see here:
> http://www.rdrelectronics.com/russ/jun16/vs2.PDF
> 73, K6UHN Alex
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