Thanks for the pic. And sorry, if I am at times a bit pushing. But it seems, like you sometimes do make statements, which you correct later, So I just really wanna go sure. I know, it quickly happens, that one has wrote something, that wasn't as it was actually meant.
For example, you said in the beginning of this thread:
The resistors were all tied together as one.They seemed to be across the feedback winding.
Now, you state that the resistors were across the primary.
Or about the freewheeling diode:
I had the same results as you with the diode across the primary coil,so I took it out as well.I'm not sure if there was one in Stans setup.
Now you state, there was one in Stans setup.
Probably you went again to see Stans stuff after these statements. But I think you will now understand why I'm asking these questions, as I just want to be sure. As even slight differences in the actual circuit can make huge differences in it's operation.
I know, I'm complicating things sometimes.
So I will try it again with the resistors. As easy as possible.
If the current is so low in the primary, that the voltage drop over the resistors is smaller than the diode voltage, it does make sense to have the resistors there, as by that you assure that you take less energy out of the oscillating circuit than just with the diode alone. The principle is simple. The lower the reverse voltage drop, the less energy you take out of the resonant circuit during pulse off. The best would be a short circuit over the primary during primary off.
So if he actually really had both (a diode and the resistor) in parallel, then it certainly is not in a flyback mode. As the diode would prevent any flyback effect. And the resistor(s) would then only make sense, if the current in the primary due to the resonance in the VIC is small.
And if you have both diodes in the primary driver circuit, you will obviously not have any problems with the transistor voltage, as the freewheeling diode protects it during pulse off, and the series diode protects it during pulse on, and at the same time this also prevents any big power loss in the resonance circuit. The freewheeling diode (with the resistor(s)) make sure, there's no big loss during pulse off, and the series diode makes sure there's no big loss during pulse on.