Stan Meyer's VIC UNICORE setup

[natone_m]

VIC output calcs.

I've been looking through the SMTB to help shed some light on how to calculate how to wind a VIC to get the desired voltage output. For instance,

If your GP has a capacitance of let's say 0.1 uF, you have a 12V supply, your target frequency is 50 KHz, and you want a voltage output of say 50 KV.
How do you calculate the size of your Primary, Secondary, choke 1, and choke 2?

H20, Your posts say that Primary, Secondary, choke 1, and choke 2 are all to be wound bifilarly with matching inductances. The part that i'm struggling with is that the inductances all affect each other (step charging). Is there a set method of calculating with these parameter to give you the desired output V? I know wire size as well as coil spacing factors into this as well.

Could you post a step by step example problem to illistrate how to properly calculate and ultimately design a VIC? Or site the formulas that I need clarity on?

[h20power]

Hi Natone_M,
I use this calculator Cylindrical Coil Inductor Design Equations Formulas Calculator Inductance to estimate the bobbin spaces for the coil count and size that needs to be used on each individual bobbin space for it has a core material permeability input. To do this you will need to know your cores permeability. Once you have one bobbin space for a group you have them all for each of the others in that group will be exactly the same. When making these estimations you have to use the Mean Radius or average coil length to calculate the inductance. The Mean radius makes it so every coil above that point equals ever coil below that point as if you where to lay the wire out in a single line. Since I make use of a drafting program (AutoCAD) it makes things go a whole lot smoother.

L = N^2 μA/l
wire coil number of turns (N) in the bobbin cavity
core material permeability (μ) you will have to look that up
coil area (A) in cross sectional view length times height
average coil length (l) in the bobbin cavity calculated by the mean length of the coil times the mean circumference of that mean coil length times the number of turns (N).
C = 2r · p or C = 2pr or C = pd (p = pi, d = diameter, r = radius) so to get the mean length you have to get the mean diameter or radius and that is the center or middle of the area of the coil. Then that result has to be multiplied by the number of turns and by the length of that center coils circumference.

And that is how I do it, the wire sizes will determine the overall area and circumference length.

When measuring the inductance only measure one wire of the bifilar coil not one connected back into the other. This measurement has to be done to verify the inductance and make small changes to the wrap count for each group manually. You will have to throw away some wire so make sure you buy enough. Once you have the inductance you are seeking to match in one coil group, you have it for the whole set in that group or to say each bobbin space of that group.

This work is kinda hard for every little change might change the mean radius, thus changing the circumference for math to be correct. A drafting program has a clear advantage in building the VIC transformers over the pure hand method so it is best to make use of one. To get the capacitance of the individual bobbin spaces is on the hard side, for me I just raise or lower the voltage going to the primary coil as needed. As for targeting the frequency use this equation: F = 1/(2pi · sqrt(L·C)) solving for L.
This photo shows the crossectional area and mean radius or diameter one would have to get for each coil group.

hope this helps,


h2opower.

I've been looking through the SMTB to help shed some light on how to calculate how to wind a VIC to get the desired voltage output. For instance,

If your GP has a capacitance of let's say 0.1 uF, you have a 12V supply, your target frequency is 50 KHz, and you want a voltage output of say 50 KV.
How do you calculate the size of your Primary, Secondary, choke 1, and choke 2?

H20, Your posts say that Primary, Secondary, choke 1, and choke 2 are all to be wound bifilarly with matching inductances. The part that i'm struggling with is that the inductances all affect each other (step charging). Is there a set method of calculating with these parameter to give you the desired output V? I know wire size as well as coil spacing factors into this as well.

Could you post a step by step example problem to illistrate how to properly calculate and ultimately design a VIC? Or site the formulas that I need clarity on?

[natone_m]

Calculating Voltage Output

H20,

I think I understand how you are calculating the inductance of the coils which is a crutial part for the resonance. What i was wondering is how the you calculate your desired output voltage going to the GP. When winding normal run-of-the-mill transformers thats easy. You just calculate your turn ratio along with wire size changes and core permeability ect. With the VIC its not a typical transformer, correct? It has the whole step charge thing, voltage potential building off the mutual inductances. Correct?

With your secondary and chokes all wound bifilarly, how do you calculate your step up turn ratios to hit a target output voltage? Am I making sense or am I confused? Please set me straight.

[h20power]

H20,

I think I understand how you are calculating the inductance of the coils which is a crutial part for the resonance. What i was wondering is how the you calculate your desired output voltage going to the GP. When winding normal run-of-the-mill transformers thats easy. You just calculate your turn ratio along with wire size changes and core permeability ect. With the VIC its not a typical transformer, correct? It has the whole step charge thing, voltage potential building off the mutual inductances. Correct?

With your secondary and chokes all wound bifilarly, how do you calculate your step up turn ratios to hit a target output voltage? Am I making sense or am I confused? Please set me straight.

You would have to caculate the capacitive reactance of a single bobbin space of each of the 3, secondary and 2 chokes, coils to find the answer to that question. Once the capacitive reactance of the bobbin cavities are known one can make the calculations for the ramp up effect at a given primary voltage input. I don't have the capability to make such a measurement on the individual bobbin spaces so I have to make my calculations after the transformer is built. The insterment needed to calculate the capacitance of a wire loop or bobbin space is very costly, but don't take my word for it, look it up for yourself. So I back engineer the math to get the capacitance of the individual bobbin spaces. In essence I make them in the blind so-to-speak not knowing what power supply will be needed to get the transformers to reach the voltages I am wanting from them. But I do know that you have to get the coil's crossectional area to be as square as possible to get the maxium capacitance and the space between bobbin spaces minimized.

Hope that helps, I know it's not the best answer but it's the best I could give,


h2opower.