Radiant power from Solid state Tesla hairpin circuit

[sollaris1989]

Hello guys , Hallo @hartiberlin .
Thank you for your good work.
I am following you guys,and I have some questions about the  IXDN604 IC.
I can also use my Signal Generator direct to the Gate of the power Mosfet, but as If I understood corectly from @Evostar aka IVo on youtube, if you apply Voltage and Amps to the gate of the Mosfet,it will switch very very fast (ns range)
and the mosfet will not heat that much.
What component / action decides if the output of the ic is 0.3 A or 4 Amps for example?
the IC above has a maximum output of 4 A......how do we get there..how we do not get there?

Also I have seen at you guys Gate drivers IC;s with power output of 10 Amps....
From a realistic point of view....how much Power does a POWER Mosfet needs at the gate to fully swich ON?

Also a see a resistor and a diode in paralel betwwen the IC and the gate of the Mosfet...What is the purpose of those 2 components.

Thanks and have a nice day guys !
Alles Gute aus Saarland.

[evostars]

gate resistor restricts amount of current going into the gate. ohms law applies.
also resistance dampens the ringing of the gate circuit (best to keep the loop small by placing gate IC close to gate. and resistance close to gate.

The discharge of the gate goes the other direction and the diode bypasses the resistance, making turn off even faster.

using external power wont work  as it is referenced to earth ground.

gate driver should be referenced to source. that is why battery is used. battery floats, referenced to source.

But I found out al this isnt needed.
positive impulses also work. (low side switch, which dos not need a hsm/isolated gate driver)

And the whole DC offset is completely unnecessary.

[evostars]

after extensive testing,
I came to the following conclusions:

DC offset, is totally useless. I will not use it anymore, and this also makes it safer to work.

Positive impulse works just as good (even better) as a negative impulse.
This means, you can use a low side switch, with out isolated gate driver (easier to build)
and get the same results

As both polarity impulses work, I will use both.
This is done in a half bridge circuit.
A symmetric power supply is used (earth ground in the middle of positive and negative voltage supply)
Mosfets won't work, as they have body diodes.
So I will need to find the fastest IGBT's (slower turn off than mosfet, due to tail)
that also can withstand high voltages.
But it must be IGBT's Without body diodes. This makes them vulnerable.
So I will protect them with TVS diodes (2 tvs diodes in series if needed).

Again will need 2 isolated gate drivers, this time with negative gate voltage possibility.

L1 produces alternating positive and negative impulses.
L2 is series resonant with C and provides a low impedance path to ground for the impulses of L1

positive impulse on L2 positive voltage maximum
negative impulse on L2 negative voltage maximum
So one period (sine wave) of L2 will have 2 impulses.

L2 is the Primary for L3 (not drawn)
L1 and L2 are close coupled, pancake coils.
L2 is bifilar

Please reply or PM if you know a proper IGBT that will work around 40-80 KHz
and can withstand 1200V, with fast turn off time and no body diode.
This is essential for impulse generation

[evostars]

Stopped using IGBT's, do not believe they are useful. due to their slow turnoff time.

found a way to beat the body diode problem of the mosfet half bridge. it works now.
testing it. I put a diode above the high side mosfet, and below the low side mosfet, to block the impulses that pass through the body diodes. I now have both polarity impulses on both polarity voltage maximums of the series resonant primary coil.

Also designed a pcb for dual isolated gate drive, for the symmetric powered half bridge. Testing that will commence soon. If it is worthy, I will share. It has no pulse transformer, and no battery. operated by isolated DC DC converter

It's getting pretty complicated. Learned so much. At the same time with all the insight it becomes simple.
The impulses, amplify the current of the series resonant coil. When close coupled to L1, it creates a feedback loop.

Yellow= L2 impulsed series resonant voltage (primary
Green= L2 series resonant current (primary)
Orange= L3 secondary voltage

[AlienGrey]

Hi Evostars I must say you have come a long way with your development,
I have sort of being following you work, I under stand you have got the build down to 2 pancake coils, are they
built the same as the originals ?
I notice you have 2 custom boards with BNC output socket, will they be available and if so where can they be obtained ?
Also what sort of value and voltage level are the Wima capacitors c1, c2, and c3. ? any further comment would be useful to us all.
and is there any where local they can be obtained from ?


Regards AG