Kapanadze Cousin - DALLY FREE ENERGY

[AlienGrey]

Hi all for those who don't know what Fly Back  is associated with line time bases of the CRT tube control circuitry.
I suppose it starts off with a 65 micro second 'information'  line and a square wave pulse at the end for the back porch.
and at the end is the drop (falling edge) can be associate as the flashback where the next line starts.

I thought this might interest people who know very little of vacuum TV tube which is nothing like an LCDs control electronics, and has very little to do with our device

But the Line output transformer and line scan coils coupled with capacitance and added 'c' can add to the slope of the wave form. So I assume the reverse would reduce the problem.

I must apologies as this info is a little of track on this tread but never the less become relevant.

See my drawing attached.

[Void]

Thanks Itsu. I'll go through the snubber design steps you posted previously, and see how it works out.

[NickZ]

Hi Void,

yes that is correct, a well calculated RC circuit across each drain / source will be able to counter the ringing.
The flyback pulse (which triggers the ringing) will be a different beast to tackle.

I use 170 Ohm ½W resistors, but it seems the lower the Ohmic value the higher the wattage needs to be.

Itsu

  Itsu:  These are my current snubber signals, with the probes placed on the drains.
I'm trying to keep the peaks at around 200v, or so. And, I do get some amplification effect there, as well.
The load is a 100w bulb on the grenade 168t coil/rectifier's output, and another 50w bulb on the 0.47 WIMA cap. To help tune both induction circuits to their best output. I'm using the PS for the 24v input.
 
   The first scope shot is of the induction circuits, with NO Kacher on.
   The second shot is of the induction circuits, WITH the Kacher on.
   Miminimum heating at that 17KHz frequency, with full duty cycle on the TL's controller.
   This type of snubber tuning is best done on a bread board. Then later fine tune it on the final pcb board.

   Belfior: I am interested in your offer to send me some of your 45 ohm 10 watt resistors. Please PM me to discuss it further.

[itsu]

Nick,

looking good, that way your MOSFETs should survive.
Only things is that you probably are not at resonance at this 17Khz.

The kacher clearly shows its influence on the square wave, how about on the Wima cap or inductor coil signals, do you see the kachers influence there also (be aware in resonance
there could be >500Vpp active and use one (HV probe) only)?.

Itsu

[AlienGrey]

Nick,

looking good, that way your MOSFETs should survive.
Only things is that you probably are not at resonance at this 17Khz.

The kacher clearly shows its influence on the square wave, how about on the Wima cap or inductor coil signals, do you see the kachers influence there also (be aware in resonance
there could be >500Vpp active and use one (HV probe) only)?.

Itsu

Nick Itsu  well 17000 hz is in the range just about and it / by 8 easy 2125 times sounds like the ground has an influence but will his katcher tune to 1.7Mhz ?  or 17120 / 2140 so tune the catcher to 1.7120 then.

Try it and see. Oh and good luck