Kapanadze Cousin - DALLY FREE ENERGY

[itsu]

  Actually, is was the Ruslan (Oleg), Stalker, PinoyTech designs combination.  I adopted some of the their ideas.
  I took a little from each one of them for my version of the TL494/Uc4420 yoke Kacher/grenade circuit.
  Maybe it's not good to mix and match...?  We'll see.

  I found late last night that my Pin 2 was not directly nor "solidly" connected to the rest of the other 3 pins, #13,14, and 15 pins. Pin #2 is just connected to the 4.7uf cap positive side, but not to the rest of the group of the 3 other pins.  I'll fix that later today.
Hopefully, that's the problem.



      Well, that WAS the problem. I connected the #2 pin back up to the rest of the three pins of that group, and I now have good clean signals at the fets gates throughout the entire duty cycle and frequency range. Thanks for the help with that, guys.
But the MOSFETs are still getting too hot, like as if there is a short somewhere.  I'll be looking into that later tonight.

   So, one problem solved, but one more to go.
   And just now my PC won't start. Can't win for losing.

Nick,

great, now take it to the next step.

(re)connect the MOSFETs to the 10K resistors or automotive bulbs as suggested earlier and scope the gate / drain signals for each MOSFET one by one.
They should show some fairly nice square wave like signals without the MOSFETs getting hot.
Run it through the frequency and duty cycle range to get a feeling of what the different setting do to the MOSFETs signals.

Itsu

[verpies]

the 2 opamps control the same logic you can't have two drivers controlling the same logic IT LOCKS UP !  sorry, Verpies. no offense intended

None taken, but no warning is necessary because when pins 1&16 as well as pins 2&15 are connected together, then the outputs of these two error op-amps are identical and there is no conflict.  Also, the OR-ing provided by internal diodes prevents any conflicts.
The TI Datasheet clearly states:

Both amplifiers behave characteristically of a single-ended singlesupply amplifier, in that each output is active high only...
With both outputs ORed together at the inverting input node of the PWM comparator, the amplifier demanding the minimum pulse out, dominates.

If you want to, you can disconnect/disable one error op-amp by disconnecting pins 15&16 in my diagram and connecting pin 15 to pin 14 as well as connecting pin 16 to ground.

[seychelles]

hi pinoy-tech, thanks for sharing the pcb layout. just wondering if you have the gerber file
for this pcb  acr 576 so that i can get the Chinese to replicate it please .

[AlienGrey]

hi pinoy-tech, thanks for sharing the pcb layout. just wondering if you have the gerber file
for this pcb  acr 576 so that i can get the Chinese to replicate it please .

Hi Seashells  silly question but why would you want to make a copy of that inverter for wouldn't it be just as easy to plug a 240v bulb into the mains ?? his supply is coming of that computer plug I presume is 240 volts top left of middle of screen befog the 240 to 12v TL494 supply TX.

[NickZ]

hi pinoy-tech, thanks for sharing the pcb layout. just wondering if you have the gerber file
for this pcb  acr 576 so that i can get the Chinese to replicate it please .

  He had uploaded some PDF files previously before he went on vacation.  Look for them around March 20 or 21st. 
  Or he may be persuaded to post them again. They are based on Ruslan's or rather Oleg's earlier TL494/UC4420 driver board.  Which is what Stalker has also simplified and is using a version of, presently. Same as I am, as well.