Kapanadze Cousin - DALLY FREE ENERGY

[NickZ]

  Here's another short video showing the TL494 circuit and the TC4420 fet drivers in action. Signal problems fixed.
  Thanks to all for your help.
   https://www.youtube.com/watch?v=sc-kXOt9L7Q

   I'm still working to solve yet another issue with the fets, and I'll know more about that shortly.  I hope.

[itsu]

Nick, 

thanks for the video, signals looking good.

I think your scope is set at 0.2ms/div, so at max frequency setting of your pot, it shows 9 pulses across the 10 divisions, making it (2ms/9) 0.22ms / pulse = 4.5KHz.
Thats kind of low as you probably would need something like 17Khz lateron.

What is your C4 capacitor at pin 5?    Is it 1nF?   Seems to me its much more.

Anyway,  now with the yoke disconnected and the 10K resistors in place, scope the gate and drain signals of each MOSFET, they should be stable now too.


As i have the lossless clamp design primaries on my yoke i can not check if your primaries are wound OK, but from memory they are ok (all turns the same direction).
Perhaps others can confirm this.


Itsu

[AlienGrey]

TL494 driver device. Notice 3 control pots PW Dead Time (2nd  PW over ride of PW) later removed as error amp shuts down device.


Also observe oscillograph of what looks like unstable driver stage. Went through all circuitry and re wound yoke found unstable wave to be ferrro related. Spoke to T1000 and note in later rewind yoke problem removed.


Notice 3rd pot removed (dead zone wiper connected to 0volts

[NickZ]

  Itsu:
  Thanks for checking things out, as well as doing the math.
  I believe that that scope readings were taken on the .5/div setting. Not the .2/div.
  The ceramic cap placed on pin #5 is a 102. So, that part should be ok.
  Today I'll be looking into the mosfets and their connections to see if I can find any problems there. As there does seam to be something not right when comparing the two fets and their scope signals. I'll know more about that later today.

   Pinoy_Tech:  Good to see you back, and posting again.
   Thanks for the information and details on your Tl494/UC4420 circuit. Although it took me a while to see what my problem was with it, I think that it's working pretty well, now. Thanks again for posting your design.  As it was similar to what I wanted to build, I thought I'd build it just like you designed it, but with a just few modifications in order to simplify it to bare minimum components.  I'll continue testing it, and connecting it up to the rest of the device today.
   
   

[itsu]

I believe that that scope readings were taken on the .5/div setting. Not the .2/div.
The ceramic cap placed on pin #5 is a 102. So, that part should be ok.

Nick,   i think you are right, 0.5ms/Div., however that makes it even worse as your max. frequency then would be 1.8Khz or so.
If you have a 1nF cap as C4, then Rv2 + R2 cannot be the mentioned 50K + 2.2K else your frequency would be between 12Khz to 200Khz.

Double check your 50K pot and R2.

Itsu