Re: [TCML] Charging a cap to 63% V

[Gary Lau <glau1024@xxxxxxxxx>]

I wasn't able to regulate the "max" voltage to a particular number, as the
goal was to find which cap value processed the maximum power for each of
two (nominal and "max") voltages.  The Max voltage varied only slightly as
configurations that drew more power had slightly higher IR drops, but was
typically 135 give or take 3-4V.

You're spot-on with estimating the power increase to be  P120*(135/120)^2).
 The nominal-to-max power increases for the 15/60's were 1.28X, 1.30X, and
1.27X.  If the Max voltage was 135V, the predicted increase would be 1.26X!

Regards, Gary Lau
MA, USA

On Mon, Mar 19, 2012 at 5:39 PM, Jim Lux <jimlux@xxxxxxxxxxxxx> wrote:

> On 3/19/12 12:37 PM, Gary Lau wrote:
>
>> NST's can behave in unexpected ways with regard to power processed, vs.
>> applied voltage and capacitive load.  I performed an experiment to
>> determine the optimum capacitor value for 15/30 and 15/60 NST's, at 120V
>> and max Variac (~135V) input voltage.  The experiment
>> and results are documented at
>> https://docs.google.com/open?**id=**0B0afsm3K5nFYNGQ3MmJlZGEtYjQ5M**
>> y00OTJhLTkwNDMtOWEwMjRkYWJkZjA**y<https://docs.google.com/open?id=0B0afsm3K5nFYNGQ3MmJlZGEtYjQ5My00OTJhLTkwNDMtOWEwMjRkYWJkZjAy>
>>
>>
>
> Interesting sets of data..
>
> On the first test, what was the AC voltage (you said Variac at Max, but
> what was that?)
>
> I note that the power increase is about what I'd expect if it's putting
> out 135V vs 120V (that is, the power is P120*(135/120)^2)
>
> At least for small capacitances.
>
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