Successful TPU-ECD replication !

[bob.rennips]

I would have expected a 3 level staircase with the same amplitude for the input square waves. 1 high, 2 and 3 in the middle, and 1 low. I checked the output from the mosfet drivers and the square waves from the drivers are the same amplitude...

Strange, how did you mix these 2 waveforms ?
Added them up via resistors or how ?

As per my original email - 2 parallel wound coils for the inputs - these two coils were wound over a single coil, which is the output.

[c0mster]

Time to fire up and test this unit off the grid.

[otto]

Hello all,

@Darren,

a little from our theory is in the pdf. I have my theory but this is not for public because its totally....

Im only a little coil winder, nothing more. I hate theories. Better theorists, will one day say us all whats going on in a TPU.

When all the jobs arround a TPU is finished then somebody can wright all the explanations.

Otto

[hartiberlin]

Time to fire up and test this unit off the grid.

Let it go c0mster !

Very exited to see your progress !

Come on, just let us know !

[gyulasun]

is this how the outputs of the 7307 are wired, as ottos symbols are a little off.
and having never used mosfets , and having only just enough i dont want to destroy
them. i understand the gates are joined its just the other pins i was curious about.

Hello Louis,

From the data sheet of IRF7307, you can see the drains of both the n-  and p-channel MOSFETs are double pins (probably due to increase the heat sink area of the drains).  See link to data sheet: http://www.radiobox.ru/pdf/IRF7307.PDF

However, if I were to use the IRF7307 as a driver, I would use the p-channel FET of the IRF7307 in the place of the upper switch where just the n-channel FET is shown in Roberto + Otto's schematics here http://www.overunity.com/index.php/topic,2383.0.html  ( otto_ronette_TPU_ECD-V1_0.pdf )  Diagram 8, page 29  and I would use the n-channel FET of the IRF7307 in the place of the lower switch where the p-channel FET is shown in Diagram 8.   You may ask why?

I think if the n-channel FET is the upper switch, there will be negative feedback against a rapid switch-on of the IRFP FET because when the gate-source capacitor of the IRFP starts charging through the switched-on n-channel driver of 7307, the increasing capacitor voltage between the IRFP's gate-source will work against the input gate switching pulse you input at Pins 2 & 4 of the 7307. This way the rapid switch-on of the IRFP FET may suffer.

In case the p-channel FET is the upper switch in the 7307, the gate-source capacitor of the IRFP starts charging through the drain of the p-channel switch (from the +8 to +12V supply) so that the increasing capacitor voltage is not able to influence the input pulse's switching effect you input at Pins 2 & 4 of the 7307.

I hope this is not so complicated as it may sound first and you understand the switching process. To fully ensure the correct switch-on and switch-off of the IRFP MOSFET, the amplitude of the input pulse you connect to the common gate pins 2 & 4 of the 7307 must be nearly the same or the same  as the amplitude of the positive supply voltage of the 7307 driver itself.  
for instance if you use +12V power supply to operate the 7307, then your pulse oscillator should output a minimum of +11V pulse to feed the connected gates in the 7307 with respect to the common negative points (your ground symbol).  
You indicated in your attached drawing a +3V supply voltage to the 7307: this is not enough to safely switch on the IRFP FET!!!  Because this FET has a threshold gate voltage of +4 or +5V with respect to its source and the +3V cannot switch it on!!!  

I attached a drawing of the pin connections of the IRF7307 as I think is correct in every respect.  I hope Roberto and others here will comment it, either pro or contra.

Regards
Gyula

EDIT: I just realised your drawing basically includes my drawing so your pin connections are correct. Sorry for noticing this only after posting my drawing.