author=partzman link=topic=3655.msg69375#msg69375 date=1535205791]
These are very interesting results, but I think you forgot to attach the modified schematic.
Oop's
Modified circuit now attached to previous post
What is the voltage step up or down ratio of the transformer that gives you the best performance? Also, what is the core material?
Ok,the core material is ferrite.
Primary to secondary ratio unknown.
I will get turn ratio,inductance and resistance values for you tomorrow.
I believe the small step up transformers found in mains CFL bulbs would do the job.
Also he small step up transformers in the cheap cameras that are used to charge up the flash cap may also work.
Maybe one of the same type from an old CPU power supply would work.
The best results so far are achieved by the original one i tried,and are using for my posted results--that being the one from the 6 volt CFL(small fluro tube) camping lantern.
So many to try,so little spare time.
I agree with your calculations on your post previous to the modified version and I also agree with your capacitive coupling analysis between primary and secondary.
Late last night I tried a single inductor version of your circuit and it did not produce your waveforms or any OU. This would support the importance of capacitive coupling between windings rather than the importance of the leakage inductance.
It would seem that the capacitive coupling between primary and secondary is needed,as none of the transformers i tried void of capacitive coupling between primary and secondary windings worked--not even close.
In those cases,all power could be accounted for accurately.
This circuit of yours Pm could be the one,as measurements have been taken carefully,and the OU results are consistent
What we need is a 555 PWM circuit with adjustable frequency that could be run from the energy being sent to C1.
The output from that is then looped back into the input.
I cant do much more with the measurements,or be more accurate than i have been,so a looped DUT is the next step.
Brad
Never let your schooling get in the way of your education.