Steven Mark`s TPU

[Freezer]

Otto

"The new master of magnetics" ?  Seems like you are on the verge.  Just be careful not to cause a meltdown, we want you around to build us all a tpu of our own.

[otto]

Hello all,

@Freezer

Im a master of NOT understanding what Im doing!!

I learned a lot about coils but I know that I have to learn, learn..  much more.

Otto

[ronotte]

@EM,

1 - The scope graphs I posted (big to be clear) are obtained

                                                WITHOUT ANY INPUT SIGNAL CONNECTED.

2 - The waveform posted are instaurated just after injecting for about  a moment (< than 1 sec) one input freq, then I switched-off the generator.

3 - The TPU itself does continue to operate at said frequency indefinitely: it also does deliver current to the lamp in the first quadrant only. I also tried to rectifie and level the pulses you have seen obtaining same results and the oscillations do not stop or change.

In this way the TPU at least classify itself as a black-box auto-resonating at 22.22 KHz stable and repeteable at any time.

Thinking about this I see a possible explanation:
may be that the mosfets, even if without any input, do capture from the surroundings some electrical fields or more simply, as the their Drains leads are connected to the coils them just feed back some signal  (via internal stray capacitance and/or Miller effect) directly to their own Gates...so establishing a feedback path...that in turn does operate the Mosfets themselves...well is just a theory. Actually the current drain, with the same voltage setting on PS, in this operational mode is much less (than when feeding the 3 freqs in).

Roberto

[otto]

Hello all,

@Roberto,

maybe you can measure the capacitance of your complete TPU???

Otto

[ronotte]

Otto,

I'm amazed by the low freq overall auto-resonance of 6" TPU at 22.22KHz. It does means that we have to lower the (input Coils) turns count in order to bring it higher for example to 35 KHz?  Hmmmmm.

Please make the same test and see what happen:

1 - connect all your 3 generators to the 3 Mosfets but keep them shutted-OFF.
2 - apply +12V or what you want to TPU
3 - just switch on only one freq for 1 sec, then turn-off the generator

Report if you have sustained oscillations....

I can measure all single coils inductance and then add all the stray capacitance...and see

Roberto.