Kapanadze Cousin - DALLY FREE ENERGY

[itsu]

OK,  back to the basics, coils removed and 2x 100 Ohm resistors installed instead, RC snubbers on drain/source still in place (no diodes)

1.8 Ohm gate resistors measured ok, the bat 42 diode across it won't measure properly in this situation.
Pin 3 (enable) on the drivers still floating.

24V supply voltage shows stable (purple)

screenshot shows:

yellow 1 MOSFET drain
blue same MOSFET gate
purple 24V supply voltage (middle tap)

All referenced to ground.

Itsu

[Hoppy]

Hoppy,  verpies,

the 54V TVS specs were posted here:

http://overunity.com/12736/kapanadze-cousin-dally-free-energy/msg474113/#msg474113

I notice that they worked fine when directly across the drain / source of each MOSFET, but yesterday i had moved them directly across the primary coils,
but then the setup started to oscillate when more then 8V on the drains, so i have removed them now.

Itsu

Looking at the spec sheet, I can see that the max operating voltage is 54V, so I can understand why you had a problem with the diodes directly across the primary coils. To be safe, I would uprate the voltage a little if you put them back across your mosfets.

[magpwr]

OK,  back to the basics, coils removed and 2x 100 Ohm resistors installed instead, RC snubbers on drain/source still in place (no diodes)

1.8 Ohm gate resistors measured ok, the bat 42 diode across it won't measure properly in this situation.
Pin 3 (enable) on the drivers still floating.

24V supply voltage shows stable (purple)

screenshot shows:

yellow 1 MOSFET drain
blue same MOSFET gate
purple 24V supply voltage (middle tap)


Itsu

hi itsu,

Can you try force enable mosfet driverwith a ~1k resistor rather than leaving it floating.

Any floating pin including trim pot can easily pick up noise from external.

I can't tell is it your scope or the noise that is producing such a thick lines for the waveform

[itsu]

Thanks Hoppy,    so something like 60V should do.


OK,  RC snubbers removed, for the rest same situation as above.

Yes Magpwr, thats my scope,  now set to averaging 4x


Itsu

[verpies]

24V supply voltage shows stable (purple)

Can your scope have just the CH3 (purple) in the AC coupling mode to better visualize any supply voltage ripples?