My first WFC/VIC

[fritz]

Some friend of mine build very nice tube-style
Meyer WFCs and forced me to build a control
unit. (.........)

Well, I made a switch pcb with an avr uC for pulse
control, a galvanic decoubled driver stage with 6 cmos
gates in parallel and 4 Mosfets as switcher in parallel.
(at this point in time I thought Rds_ON will be of importance)

The first step was to pulse the water cells with this switcher,
coupling the watercell with a diode.
Well, lots of bubbles and lots of amps - looks quite impressing -
if you forget about the amps.
The cells got passivated very carefully - and the water cells keep
the charge up to a minute without serious discharge.

On using coil to drive the wfc -I found out that driving the circuit with
HV FETS improves the usable transformed(to that later) Back EMF.
Because no energy is consumed by the breakdown (which was around
150V for the first fets) - I got now nice 1kV back emf pulses.
The HV fets have up to 4 Ohms Rds_ON, but I get this 1kV pulses
even with 4 Volts swiching voltage (which is somehow impressing).

Well, the VIC

I didn´t stick to the original VIC design - just wanted to produce something
similar to investigate the operation.
I took a 1cm dia, 5cm long ferrite (ur = 15?).
Put on 3 layers of bifilar "choke" on it - L around 350uH, 1nF coupling
between (measured with khz).
On top of that 1.75 layers of bifilar primary/secondary winding.
I used 0.5mm copper wire.
This gives 150uH and 333nF coupling.

What I see are properly transformed (by 2.5) pulses and _HEAVY_
back-EMF pulses with 1kV.
I tested that with 600V 40uF Cap as load - reached immediatly 500V
with _4Volts_ Input.....

Whats interesting ist the behaviour of the VIC without load.....
As long as you short circuit a winding, the core is heavily damped,
and the primary coil "looks" quite normal on the scope on pulsing,
Not shorted - you get a short back EMF to 1kVpulse, this goes down after the
pulse immediate to a -300V pulse, ends up at zero - and after some timeconstant
(doesnt rely on pulse frequency - there is a second back EMF pulse, with oscillating
fade out.

My conclusions are that I think - the back-EMF is very important on the Meyer circuits,
that the so called "pulse doubling" behaviour is caused by the VIC impedance relations,
and this should match the operating frequency as well as the WFC /LC resonance
frequency - and eventually needs some relation to the mechanical resonance of the
WFC outer tube.

What concerns the operation - I think that the back emf spikes are stored by the
wfc and feed a resonance between wfc-c and choke l. The adjustable bottom choke and
the special connection to the tubes are used to match the inpedance to get as much
energy as possible into the wfc.

Any suggestions / vic descriptions welcome.

BTW: After studying lots of Meyer stuff - I just look at the
pictures - everything else is fuzzy. 

[nievesoliveras]

Hi!

Maybe I do not have the expertize you need. But there is a waterspark that uses high voltage that help you with some ideas on the schematics the post http://www.overunity.com/index.php?topic=5024.0
Another good place to look for information about hydrolisis is the index http://www.overunity.com/index.php

Jesus

[fritz]

Thanks for you suggestions,
I think there is no shared  technology with the waterspark
projects.

rgds.

[fritz]

I had the idea to shift the emf pulse voltage up to some kV using
multiple, synchronous switched HV mosfets in series.

...

[Farlander]

Hey fritz,
sounds like you're doing good work.  What chip are you using for your frequency generator?
Also, have you considered applying the negative voltage back-emf to the negative electrode?