WFC VIC

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sorry, i thought you were familiar with this guys other videos too, i think his basic idea is to have 2 cores in one transformer, the first core has a primary and secondary, and the second core only has the secondary on it, and somehow when you draw a load on the secondary the primary is unaffected, not sure how, but the idea is to pull current out of the secondary and not have it pull the load through the primary because the second core re-directs the flux around.... i don't completely get it, i was wondering if you did, or maybe anyone else?

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this video is the syncing of vco's which is what a pll circuit does?
phase locked loop = phase synchronized loop

[youtube]http://www.youtube.com/watch?v=gxkIhbY_KxU[/youtube]

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Hello outlawstc,


Yes the pll can do this, i'm not sure if he is using a pll. Actually if i understood well the guy is synchronizing the beginning and the end of the pulse with the square wave. If i understood well when the square wave is on, it turns off the saw oscillator and until the square is off the saw wave wont start. It is a kind of synchronization, like those for half wave bridge drivers.   

Thinking yet better you can do this if the saw source have a trigger input so you can use logic Ics to accomplish this kind of sync.


This kind of sync is 20milion times better than dave lawton circuits cause when you adjust the right frequencies you will get the resonance pulses always being sent at the right time. This is interesting. What was that circuit from the video used for?


A pll can pick up a signal and tune into it, it can do this because there is a capacitor witch is the filter that stabilize the voltage of the VCO, when the received signal frequency is different from the signal it is generating and is in the bandwidth of the pll, it will automatically control the voltage of this filter capacitor to adjust to the frequency received. Stan created a resonant scanning circuit that was able to scan the frequencies by changing the voltage of the VCO arbitrary and when the frequency match the resonance, the scanning circuit turn off by receiving a signal from the pll lock in circuit witch is feature of the pll chips witch you can make to light a led to know if you are in tune and also to control logics when in resonance or out like turning on and off automatically the scan circuit..  I'm going to get my mind on work next year to have the power stage just like the one he proposed using bipolar transistors. Even if they are more sensitive, i think that they are faster and the most important feature is the current control.


Stan copied this from a Japanese patent witch he mentioned in the PLL patent.

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I have been working on drawing the dimensions for the delrin bobbin assembly..  heres where im at..

i decided to measure a serial port on my computer from mount hole to mount hole center.. its 1 inch..

i printed up a pic that matched the serial port in the photo to 1 inch.. so i guess you could say a decently scaled photo to match the real size?

here are the choke bobbin dimensions i came up with..

from a top view,
depth = the depth of wind cavity in inches
length = length of coil cavity in inches
width= the width of the bobbin (thickness of bobbin)

top view of choke cavity gives these variables
depth = .5"
length = 1.375
width = .625

side view gives these variables
depth= .625
length = 1.375"
width= .375

there is a variance of depth and of width between the two angles of view...

when it comes to using the multi layer coil formula how does one account for the 2 perspectives of  bobbin dimension?

looking at stans vic, it seems that the bobbin core is not square but rather its rectangular.. is there a way to calculate a means between the 2?

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can someone share the math approach for converting the air core value of a inductor to one with a core? something to do with permittivity.. i think me and ancientmist were discussing at one time.. is it that you multiply the inductance value of a air core by the permittivity value of a core?

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Hello owtlaw, there is a formula witch i don't remember very well that i found in a book. However you can find it on wiki too...


Would be  4pi× 10^7 * ur * (N^2*r^2/D)       

ur is the relative permeability of the core

N^2 stands for number of turns squared 

r^2 is the radius of the coil winding squared in meters

and D is the diameter

4pi × 10^7 is the permeability of free space, it is multiplied by the relative permeability of the core so you have the absolute permeability.
There are other formulas in witch you input the core cross section witch i think could be more precise. http://en.wikipedia.org/wiki/Inductor

You could use the short air coil calculation witch i found is great even if bit complex-


Man the coils are an art.

I use to make like 10 turns than measure the inductance, than i divide this value by 100 (turns squared) and i get the inductance per 1 turn squared. Than i calculate for the number of turns i want. For me this is the easiest way.

I have a nice news, yesterday i made the inscription in the fei institute of electrical engineering. I had to sign something like a NDA contract saying that any idea or patent or anything i have in the next 5 years will be their possession, except of this i'm very happy. hehe I just made this to assure that i will be doing an university next year, i still making other exams for trying the physics university...

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OK I mesured my coils tonight.All of my wire is 30 gauge .010" diameter.
Primary inductance= 200mH ,  200 turns
Secondary inductance= 3H , 1000 turns
Chokes inductance= 6.5H , 2000 turns
Ferroxcube U core,the largest one they make
again my LC resonance is @10khz at @ 1kv at the cell
 
Don

Don,
I try to replicate the VIC coils in the BOX (3-23 VIC).

Is this the core you are using a: Ferroxcube U core U126/91/20?

When Relative Permeability ?/?0 for a U126/91/20 core is 2050.
The choke inductance (no core) should go down from 6.5H to 3.17mH, correct?

It would be nice to know each coil resistance.

Are you using the coil dimensions in the (3-23 VIC BOX) picture?

I'm having difficulty to find the resonance frequency. Not in range 1 - 10kHz.
My sec and chokes are: 48.8Ohm / 153.6mH / 0.25mm2 / 2000 turns (core) 31.7mH (no core)

br,
Webmug

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my cores are UR64/40/20-3F3
I've changed coils so often since that post,I don't know where I'm at now.My latest coils resonate @ 30khz.
My coils are made to fit the window area of each side,can't make them any longer.
Don