Kapanadze Cousin - DALLY FREE ENERGY

[magpwr]

hi itsu,

May i ask can your "High voltage probe" detect nanosecond pulse base on old circuit which you have created some time ago.Eg:1.5volt version or etc.

The reason being my 40KV   x1000 probe is unable to see anything .No waveform detected for nanosecond.

If your HV probe is able to detect nanosecond can you provide me your probe model or spec.Thanks.

I have made a wrong move few months ago.

[Hoppy]

hi Hoppy,

The yoke which i have at the moment is a baby meant for 14" TV.
I would need to find a suitable size yoke maybe 1 month wait again.

Mag,

Thanks for comments on the purpose of the NTC5.

That's an advantage I have living in the UK. Next day delivery on almost any component.  Having said this, it does not include TV yokes that are now pricey, even on e-bay. Best bet is visit your nearest refuse centre and look for a big old TV. My refuse centre does not allow the public to take electronic items but a few bob dropped.... Better still try to get hold of one of those magic Russian yokes. 

You commented back Jeg in post 5438:-
"hi Jeg. Honestly i am not interested in Brutto drawings like he is the teacher for Ruslan. Don't you find it's silly constructing a step up secondary coil on yoke and connecting a bulb to it. These are the silly things which prevent people from progressing in this topic for so long"

Please explain why you think this is silly.

[itsu]

I was thinking in terms of loading the 28 turns with a FWBR and 30W of lamps as per circuit schematic. I assume that you have nice short gate leads.

Ok,  i could try that (the original Ruslan diagram does not has a FWBR), i will use fast UF4007's, the 550Vpp would light up the 30W nicely i guess.

The gate leads are the 11 Ohm (in my case 4.7 Ohm) resistors with some short wire length, but if it will not improve by any
snubber methode i use, i will have to change the circuit as to have the MOSFET's separated (now on one PCB / heatsink) each on its own PCB/heatsink and the MOSFET drivers also on these PCB's (drivers now still on the breadboard with the TL494).

Regards Itsu

I put a FWBR made of 4x UF4007's and a 470nF capacitor at the 28 turns secondary of the yoke (after adding extra 28 zeners, see below).
There was a 57V DC-like (very irregular peaks to zero) signal which caused a 220V / 25W bulb to dimly glow.

The both MOSFET's drain signal was still ringing and irregular, even after adding an extra pair of 28V zeners in series with a schottky diode (cathode to cathode) across each of the 6 turn primary of the yoke.
The signal did improve because of this (most high peaks are gone), but still the switching was irregular.


I will dismantle the present MOSFET setup (both MOSFET's on 1 PCB/heatsink) and go for separate PCB/heatsinks with the MOSFET driver also on that PCB.

Regards Itsu 

[Hoppy]

I put a FWBR made of 4x UF4007's and a 470nF capacitor at the 28 turns secondary of the yoke (after adding extra 28 zeners, see below).
There was a 57V DC-like (very irregular peaks to zero) signal which caused a 220V / 25W bulb to dimly glow.

The both MOSFET's drain signal was still ringing and irregular, even after adding an extra pair of 28V zeners in series with a schottky diode (cathode to cathode) across each of the 6 turn primary of the yoke.
The signal did improve because of this (most high peaks are gone), but still the switching was irregular.


I will dismantle the present MOSFET setup (both MOSFET's on 1 PCB/heatsink) and go for separate PCB/heatsinks with the MOSFET driver also on that PCB.

Regards Itsu

Itsu,

Thanks for trying this. Have you got back-to-back 18V zeners between the gates and ground? Also, try a 47uF tantalum caps directly across the supply lines close to each of your mosfet driver chips.

Edit: Also, try a low gate resistor value around 4R7.

[itsu]

Itsu,

Thanks for trying this. Have you got back-to-back 18V zeners between the gates and ground? Also, try a 47uF tantalum caps directly across the supply lines close to each of your mosfet driver chips.

Edit: Also, try a low gate resistor value around 4R7.

Hoppy,

i have 12V TVS's across gate to ground, and a 4.7Ohm resistor between driver and gate, see diagram of my present snubber circuit below
ALL items are in place, in red those with different values then original (also, the UF4007 (in my case) across the 10 (7.5) Ohm resistor is REVERSED, so cathode to ground!).

The gate signal is good, no problems there, its the drain signal that is not following the gate signal.

Yesterday i added to ALL THIS across each 6 turn primary a 28V zener in series with a schottky diode (cathode to cathode, zener anode to 12V) which got rid of many high peaks, but still some ringing and worse, MOSFET's switching when not activated by the gate signal (or by the opposite MOSFET gate signal/spike).

So going for a new setup,  regards Itsu