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Re: [TCML] Top Load Output
Hi Cole,
as Gary and Jim mentioned, you can guesstimate the theoretical value of
the maximum voltage obtainable, but that's about it.
Here's one of many methods and I'll use Javatc's default coil outputs
for C's and L's as it's repeatable reference.
TopV = peak voltage at tank x sqrt(Cp/Cs)
TopV = 21000 x sqrt(.0188uF/39.334pF)
TopV = 459.1kVp
Note above the 39.334pF is the Cdc value at low freq. If we use C at the
resonant frequency (Ces in Javatc), then Cs is 27.728pF.
Using this value (which is a little more appropriate for the goal) our
output in this case will increase as follows:
TopV = peak voltage at tank x sqrt(Cp/Cs)
TopV = 21000 x sqrt(.0188uF/27.728pF)
TopV = 546.8kVp
We can do a simple cross check with peak base current:
Ibase = (Transformer peak output voltage x sqrt(Ls/Lp))/Sec Reactance
Ibase = (21000 x sqrt(17.346mH/25.669uH)) / 25011
Ibase = 21.8 Amps peak
Then:
Vtop = Ibase x Sec Reactance
Vtop = 21.8 x 25011
Vtop = 542.2kVp
Note, Ibase listed above is a peak value (rough equation also). The
average base current is FAR lower near 1 or 2 amps, however, it is
important for us to use the peak base current as it is directly
affecting the breakout conditions at the top of the coil. Also when
measuring base current for this purpose, you want to use a current
transformer with decent bandwidth and a scope capable of capturing those
peaks. The REAL value of top voltage is going to be much lower due to
breakout conditions with factors relating to geometry and environment.
In the end, the breakout voltage on this coil is going to occur likely
between 250kVp and 300kVp, a far cry from the theoretical possible. So
as fun as it is to play with these numbers, without being able to
identify the actual breakout voltage, these "max possible" values are
sort of an academic exercise.
Best regards,
Bart B. Anderson
On 4/28/2011 4:17 AM, Cole Awesome-Jordan wrote:
Hi, is there an equation to determine the output voltage and amperage
of the top load? I've been searching but I can find anything.
Thanks
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