Quote from lfarrand on January 5th, 2022, 01:36 PM

Sounds like a promising development. I'm very interested to find out what happens when you connect a load.

I've been doing a lot of research into parts lately, and I came across a new SiC 1700V MOSFET from Microchip, part number MSC035SMA170B4. The price is good () and the specs looks great - 1700V, 35 milliohms RDS(on). Manufacturer page link: https://www.microsemi.com/existing-parts/parts/152458

I also found a nice gate driver, the Infineon 1ED3124MU12HXUMA1. Voffset 2300V, Viso 5700V, Rise/Fall time 15ns. Manufacturer page link: https://www.infineon.com/cms/en/product/power/gate-driver-ics/1ed3124mu12h/

both look good! great find!

I've noticed that more of the high voltage SiC MOSFETS are coming in a 4 pin package, including separate power source and driver source connections.

More info here: Advantage of the use of an added driver source lead in discrete Power MOSFETs

Quote from lfarrand on January 6th, 2022, 01:05 PM

I've noticed that more of the high voltage SiC MOSFETS are coming in a 4 pin package, including separate power source and driver source connections.

More info here: Advantage of the use of an added driver source lead in discrete Power MOSFETs

yes I have a few of those 4 pin mosfets. they work fine when you join the source leads.

That's what I suspected, but thanks for clarifying that point.

Are you concerned about unequal voltage sharing over the MOSFETs connected in series? It seems that the voltage is likely to be distributed unequally across the MOSFETs due to a range of reasons including temperature differences and manufacturing tolerances. Example: 3400V pulse is distributed as 1900V over MOSFET 1 and 1500V over MOSFET 2. For 1700V MOSFETs this could lead to failure.

I've read that there are a few ways to work around this, for example employing an active gate driver with dv/dt feedback. I wonder if any of the IC gate drivers provide such functionality?

Quote from lfarrand on January 7th, 2022, 08:57 AM

That's what I suspected, but thanks for clarifying that point.

Are you concerned about unequal voltage sharing over the MOSFETs connected in series? It seems that the voltage is likely to be distributed unequally across the MOSFETs due to a range of reasons including temperature differences and manufacturing tolerances. Example: 3400V pulse is distributed as 1900V over MOSFET 1 and 1500V over MOSFET 2. For 1700V MOSFETs this could lead to failure.

I've read that there are a few ways to work around this, for example employing an active gate driver with dv/dt feedback. I wonder if any of the IC gate drivers provide such functionality?

never had problems with voltage sharing.
3500V impulses from 2 series 1200V mosfets, seems fine.
but I always use active cooling to keep the temperatures low.
they get hot from the body mosfet that passes energy from the second half wave of L1 after turn off

was thinking about dielectric induction.
and the levitation of the alu foil.

the L1 has rapid unipolar voltage changes of up to 3500v at 230nS when using a fast L1.

I could attach an isolated plate to L1 and put a glass jar of water on the plate, fill it with destilled water.

both are high K dielectrics.
they should conduct the dielectric field.

then use a capacitor that is grounded on one end through a fast diode.

the other end of the cap is in the water.

then see if it can charge (by seeing if it discharges with a spark).

experimemt 2, would be to create opposite dc with a cap and diode, and connect this to another isolated plate.
the two plates stacked forming a hv capacitor.

then again a glass jar with water and capacitor with diode to. ground.

then see if one side charges faster.

without the lamp load, but only the rectified DC
frequency is of max L4 sine wave is 133kc/s.
If tune down from above, L4 first shows 4 octave higher sine, then becomes 1 single sine.
The impulse is fully absorbed into L2

With the 42 lamp connected (and brightly lit) to the rectified dc,
The frequency drops down to 54 kc/s
I then tune to max brightness of the lamp, which is also the max current on L2
impulse now is visible on L2

Tomorrow my tuning capacitors for L1 will arrive. then I can see if I can tune the impulse to the higher octave resonance of L4

these shots are with the lamp load at F=56.3kc/s almost tuned to perfect frequency
I zoomed into the orange lead, which is the L4 signal before the rectifier.
I measured the half wave and it is 800nS, so L4 =625kc/s
My impulse is now around 400 nS so I should add enough parallel capacity to get the L1 impulse to 800nS

bit strange... as I first tried to get the impulse faster to get higher voltages, and now I need to slow it down again.
but if it is effective, I could also use a slower L1 coil again.

With the lamp load attached and tune to max out, the L3 now also doesn't show a perfect sine wave any more
attached is L3 voltage in orange.
This is with 11nF parallel to L3, and 134nF in series with L2.
The ripple is slower than the L4 ripple.

When I increased the capacity of L3 I could not detune the system, it stayed resonant at 54kc/s
I did see a change in the L3 ripple, but It did not form a single sine wave.

I could make L3 capacity bigger, but, I think best is to decrease the L2 series capacity which is now 134nF.

So tuning is still hell. But when the caps for L1 arrive tomorrow, I might at least tune the impulse to the L4 frequency.
Then, L2 can be tuned to a sub harmonic. then L3 finally for fine tuning (?)

what a job...
But I can do it

ok, did the test with distilled water conduction and it works. going to be another fun video

I checked if a cap can be charged by the water conduction, and yes it can. I put a diode between the cap and ground.

My previous video showed floating aluminum, which was the result of magnetic induction.
To make it float, I needed to give the impulses more power.

I will again put a capacitor parallel to L1, amd lower the frequency, so I can pump more power into the impulses.

This is needed to transmit enough power through the liter of distilled water to Power a small load, like a lamp or motor. just a few watts. to show it really works

after playing with the L1 coil only.
producing - 3kV impulses at 25kc/s
I successfully am now able to  charge up the capacitor through the liter (20cm) of distilled water.

but now my energy is crashing hard. Super tired! just a few hours later.
there always is a delay.

I wasn't grounded.
but it is clear the negative displacement current is an inflow into the system, and it sucks the life out of me.

Im now sitting on the ascention seat to charge myself up again.
I feel so sleepy, I only want to sleep. while I had good sleep nights the last couple of days.

So stay grounded.
maybe positive impulses are better for healing work. as that is an outflow of displacement current (into the body)

need to rest and recharge.

I now understand why I need the diode.
which is odd, as the Tesla radiant patent doesn't show a diode, only a capacitor to ground.

The impulse (resonant half wave) has a up and a down change of voltage.

so 2 changes of voltage, two dielectric inductions.
To store both the attached circuit should be used.

Maybe Tesla's impulses were so violent, that the displacement current, was made as a constant flow, instead of single longitudinal ripples

edit: tested and works. I get positive on one cap and negative voltage on the other cap relative to earth ground.
But I decided not to discharge both caps simultaniuously, as that could blow the diodes. Much safer to discharge each capacitor separatly, shorting only the cap out.

I tested it with positive impulses, and it also worked. impulses are conducted through water, cap charges up, and can be discharged with a bang.

I wondered about this, due to cathode rays. which use the negative terminal. While anode rays also are detected they seemed to only work with ionised gasses.
So I though it might not work. but still it does.
Still no differnece detected between positive and negative voltage properties. (still need to do the spark discharge test)

Since the copper plate induces a displacement current, based on pure dielectric induction,

I should also be able to induce resonance in a pancake coil, with this copper plate method

The resonance is then purely induced by dielectric induction.

Simce the impulse is a half wave,
it is made out of 2 quarter waves.
each quarter wave has a different polarity change.

so does it make sense to get the power out in only one direction? with only one diode?

so the displacement current can flow only in one direction?

or doesn't that work, because the impulse/ displacement current is much shorter in duration than then L3 L4 coil system?

is  fig 4 sending or receiving ?

Magnifying the rf in bound would be the thing.

I finished my new video. Will premiere this weekend.
It explains how Nikola Tesla's Radiant Energy can be used to conduct electricity through pure distilled water which is normally non conductive.
Radiant energy=Displacement current, induced by rapid changes in high voltage.
That's why Nikola Tesla used impulses!

I'm very much looking forward to your new video, sounds very intriguing.

I just watched the original video where Eric Dollard, Peter Lindemann & Tom Brown reproduced radiant energy effects using longitudinal waves. Eric Dollard is still alive and kicking and is working on a new project and has published some videos on YouTube.

I also came across this post on another forum which sounded interesting: Interesting BEMF recovery circuit - Brandt-Tesla switch finally explained?

new video

https://youtu.be/NVTCEMw2-pU
goes live at 8pm GMT

Problem...

I noticed I got tired after being in my workplace. very strange. happend several times. while I wasn't testing.

Turnsout my work bench is polarised.
I measured 165V/meter while system was turned off.

So... thats bad...

Quote from evostars on January 29th, 2022, 11:05 AM

Problem...

I noticed I got tired after being in my workplace. very strange. happend several times. while I wasn't testing.

Turnsout my work bench is polarised.
I measured 165V/meter while system was turned off.

So... thats bad...

That doesn't sound... good. How did that happen?

I found a couple of papers that might be of interest:

Parametric Excitation, N. Minorsky, 1950

Parametric Excitation Of Electric Oscillations, L. Mandelstam and N. Papalexi, 1934

Ivo, saw you mention three energy forms in a reply to a post in the comments section of your new video and it triggered a thought. I read something by Eric Dollard where he mentions 4 forms of energy which are interchangeable.

He goes through the following from almost first principles, so it's a long read, but the pertinent bits (in bold) are:

Three dimensions form the primary basis for subsequent relations:

(1) Q, Total Electrification, Planck,

This is our substantial dimension, the spaghetti, or the milk; and,

(2) t, Time, Second,

(3) l, Space, Centimeter.

These serve as our metrical dimensions, the forgotten past, or the throw-away package.

Subsequently established has been a series of dimensions and dimensional relationships, save yet Inductance, Capacitance, and the Electric Force. Two primary substantial dimensions were established by divorce from Q.

(1) Ψ, Total Dielectric Induction, Coulomb,

(2) Φ, Total Magnetic Induction, Weber.

Derived then are four secondary, or compound, dimensional relations:

(1) I, Displacement Current, Ampere,

(2) E, Electro-Motive Force, Volt,

The laws of induction; and,

(3) e, Electro-static Potential, Volt,

(4) i, Magneto-Motive Force, Ampere,

The laws of proportion.

Hereby it is we have two Volts and two Amperes: Volt; Weber per second, E,

Volt; Coulomb per Farad, e, And Ampere; Coulomb per second, I,

Ampere; Weber per Henry, i. These four dimensional relations serve the principle needs of Electrical Theory.

A pair of auxiliary dimensional relations are also important. These are given as,

(1) Energy; Joules, or Planck per Second

(2) Activity, or Power; Watt, or Planck per Second Square.

Here we have arrived at eight principle dimensional relations for the understanding of Electrical Theory and Practice. All other dimensional relations are developed from consideration of the Metallic-Dielectric Geometry and the Aether with which it is engaged.

You can find his detailed posts here: http://www.tuks.nl/wiki/index.php/Main/EnergeticFormPosts

I Tuned the L1 impulse by placing 10x 68pF (680pF total) 3kV ceramic caps parallel to L1
This made the impulse duration equal in the L4 extra coil half wave. both around 700nS duration.
I tuned this at 156kc/s above resonance, so I could clearly see the impulse and the L4 wave form.
with full input power, 0.59A x 64.6V
I could generate 1000V impulse max.

When I tuned down to full resonance, somewhere around 134kc/s
the L4 showed a perfect sine wave of 5000V peak to peak!!!
I already should be able to produce some streamers,
but I prefer to stay out of the fields of the coils, when they are this powerfull.

I also didn't measure current, as the current probe heats up, I suspect the displacement current is captured inside, and stored in a capacitor, which then is overcharged. so ... I need to open it up, as it started heating up. maybe put better shielding in, or... a zener to protect the cap. if I can find the problem...

This test was done with my new coil capcacitor which I cast in epoxy. Same coils as before. But L1 L2 L3 are now casty in epoxy. L4 is still close coupoled to L3, as there is just a small layer of epoxy on L3.

saw this on youtube, very interesting and easy
shows the electric field (and its changes) including polarity