Kapanadze Cousin - DALLY FREE ENERGY

[Belfior]

I'm on page 16 of this thread and it took me a day

Can the ferrite yoke be almost anything or do I need to go to Latvia and kick some grandmothers door in?

It seems it gives trouble if it is too large?

[NickZ]

  The yoke is a very important part of the system, it is the heart of the device, and is meant to run at around 15KHz. So, if you don't want to, or can't follow the suggestions or diagrams, you may have a hard time getting this to work right using some other type of core. Look for yokes on the older CRT TVs, or monitors, and pull out the ones that are about 3 inches wide. But not any yokes that are any  smaller than that. Bigger ones like 4 inches may work, as well, but not the smaller ones than are less than 3 inches wide.

   It can take a long while to go through all of the previous posts. But, you need to know what this project is all about. There are no short cuts to the learning curve. After my 3500+ posts, and having read all of the posts on this thread, as well as all the posts on the other Kapanadze thread, and ALL of the related videos, I'm still just learning the ropes.
This project is not for the impatient types. As it requires much persistence, and some luck.
                 So, good luck to you.
                                                  NickZ

[NickZ]

    Itsu:
    Below are my current gate signals, showing a lower duty cycle.
  volts/div set at 10, and sec/div is at 20us.
  Let me know if you need anything else to figure the snubber values, and I'll always do as you suggest.

  TinselKoala: 
  Yes, my gates are getting 15v from the UC4420 drivers.
  My PSU is 24v, and the UC4420 drivers are getting 15v through the 15v voltage regulator, and to the gates.
  My TL494 circuit is getting 12v through the 12v regulators and filters.

     I've ALWAYS had hot running fets, always, no matter what I do. So, I think that the unbalanced problem as well as the overheating issues may be due to the yoke.  However, I'll install some snubbers, first. Even though the Stalker diagram which I'm following does not use any snubbers.  After that, I'll change to the new opposite windings yoke, and give that a try.

   apecore: Can you please upload Verpies lossless clamp diagram for me, as I don't have it anymore.
Looking for it on the site, can be a pain in the butt.
   
   Thanks, guys.
 

[lost_bro]

    Itsu:
    Below are my current gate signals, showing a lower duty cycle.
  volts/div set at 10, and sec/div is at 20us.
  Let me know if you need anything else to figure the snubber values, and I'll always do as you suggest.

  TinselKoala: 
  Yes, my gates are getting 15v from the UC4420 drivers.
  My PSU is 24v, and the UC4420 drivers are getting 15v through the 15v voltage regulator, and to the gates.
  My TL494 circuit is getting 12v through the 12v regulators and filters.

     I've ALWAYS had hot running fets, always, no matter what I do. So, I think that the unbalanced problem as well as the overheating issues may be due to the yoke.  However, I'll install some snubbers, first. Even though the Stalker diagram which I'm following does not use any snubbers.  After that, I'll change to the new opposite windings yoke, and give that a try.

   apecore: Can you please upload Verpies lossless clamp diagram for me, as I don't have it anymore.
Looking for it on the site, can be a pain in the butt.
   
   Thanks, guys.

Good day NickZ

Just attached the Lossless clamp design originally posted by Verpies.

If you wind *opposite* primaries on the yoke coil (using a complimentary drive signal), you will produce __in-phase_ output pulses and  NOT the  complimentary signal pair as is required for push pull operation. The Fets will then be effectively paralleled together and *appear* to fire simultaneously.



What can be tried as mentioned by T-1000 is the "parallel wound" primary, which is set up sort of like a bifilar wound coil (both primaries are wound together at same time).  On one side both ends are connected together >> Positive power rail, and other two loose ends >> Mosfet Drains.

take care, peace
lost_bro

[apecore]

Nick,

Be aware you can not use the TC4420 in combination with the lossless clamb, they haven't got the ENABLE pin.
I think Itsu is right,......first solve the problem.
This clamp thing wont solve it.