Kapanadze Cousin - DALLY FREE ENERGY

[NickZ]

  I already joined the club, years ago, and the pile of dead component are my proof.
  Oh! What fun...  yet no self runner to show for it.  YET.

[itsu]

OK,  made a new yoke, paper inbetween the both splits.
Secondary 20 turns 2.5mm², primary 2 x 5 turns 2.5mm² on one half of the yoke.

Works fine in normal mode on 24V        on 12V (3x parallel) same special mode problems.

Adding caps on the secondary still gives problems as it goes again into chaotic behaviour (special mode)

Secondary measures 140uH, so to reach 26KHz we should add 267nF   (http://www.1728.org/resfreq.htm).

Video here: https://www.youtube.com/watch?v=5UJx9o-yKNs&feature=youtu.be


Regards Itsu

[TinselKoala]

With  mosfets overheating and popping, my feeling is that your inductors and capacitors are not "balanced". Certainly you can reach your desired oscillation frequency by many different combinations of inductance and capacitance, right? I believe that your inductors are too heavy and your capacitors too light, if you know what I mean. Lowering the inductance and raising the capacitance to keep the same frequency, should reduce the component heating problems I think. It will also boost your power throughput to whatever comes downstream of the inductor windings, I think.

But I probably can't justify those "thoughts" based on theory... just a lot of practice. Here's about six months worth of practice:




(Something else that makes mosfets heat up more than necessary is being continuously avalanched. But this might be necessary to "tap the Quantum zeropoint" or whatever.)

[Void]

Nickz, to me it doesn't seem that surprising that your FET's are getting hot if you are delivering
a fair bit of power to several lightbulbs as a load.  The more lightbulbs you are lighting, the more
power the ZVS driver has to supply, so the hotter the FETs will get. If you are lighting 4 or 5 lightbulbs
fairly brightly, then that is still a fair bit of power that the ZVS driver has to deliver through it, even if it is
running with decent efficiency. Why might your circuit be lighting more lightbulbs than some other
people with similar ZVS drivers can light? It is likely a matter of impedance matching from the ZVS driver
output, through the transformer and whatever other circuitry you have after that to the load. The way you have things
currently connected may be providing a pretty good impedance match from your ZVS driver to the lightbulbs at the output. It doesn't
matter if you are using a very efficient driver circuit if you have a bad impedance match from the output of the driver circuit to the
load. A bad impedance match can potentially also make your driver FETs very hot, depending on exactly how you have
things connected up, but in your caase where you are lighting several bulbs fairly brightly, you do seem to
be delivering power to the load half decently. Nick do you have a drawing of how you are connecting things
after your yoke core transformer? Are you going into an air core transformer after that?

All the best...

[NickZ]

  Itsu and All:
  Good to see that you've made some progress from the changes to your yoke coils.  However your secondary coil is still not wound correctly, and should not go all the way around, as you have it. The gap is important, as that is where the three turn output coil will go in the future, and also the output will not be the same winding it that way.  Look at Akula's yoke, or also check my yoke image, once again as well.

  The scope signal looks great, very nice... but, I hear no ringing coming from the yoke, which means that it's not running at anywhere close optimum output yet, but still at the low output low light mode.
    Now, I really recommend buying some NEW 100 watt bulbs, (not using used ones).  I would buy at least 3 to 5, 100 watt, 110v bulbs, as they are very cheap, and work best for this circuit. I've tried many different bulbs. Three to four bulbs gave me the best light output, at least in my case. The most I tried with success is 7 of those bulbs, so far.
  Geo mentioned that he obtained 1000w to 2000w output from his set up. I wish that he would have showed that though. Hi, Geo, I know that your there...

  Once you have several of these 100 watt bulbs running together you will need to see which tuning caps will give the best lumin levels. But, it best to first get the maximum light output possible, BEFORE you try to further tune using the tuning capacitors. This is very important, otherwise you'll be tuning to the low output mode.
  The point of all this, is being able to obtain maximum magnetic output from the yoke coils. So, don't tune with the caps, using just one or two 100 watt bulbs. First see how many bulbs it will take to obtain the best lumin level possible, then use the tuning caps to further improve on that resonance, and brightness level.
   I would also recommend using the same tuning caps that Geo used, which are the 0.33uf, or so, 650v poly caps.. Anywhere from 0.22 to 0.47uf. would work for the yoke input side, as well as for the yoke output side. Remember, it is also a balancing act. I just try on whatever caps I have on hand, to see what combination works best. But, buying the right value caps is much better. Using the proper tuning caps in balance, on both the yoke's input coil side, as well as on the yoke output side is most important.

  Well, I won't bore you with more details, for now. Happy tuning.
     
   NickZ