Bedini SSG - self sustaining

[plengo]

@Magluvin

I am totally impressed with that last setup. Running really fast and putting out 1.3 Watts? Uauuuuu.

May be you can make it run itself!

Fausto.

[plengo]

Hi Fausto,

According to your PIC control codes (from your Reply #140, previous page) switches 11 and 12 are turned on at the same time, right?  Can you tell, how long this simultaneous switch-on for these two switches lasts?  (Maybe about 27-28 millisecond?, guessing from your scope pictures.)

(Your opto switch has a rise and fall time of 7-7 us (microsecond), from its datasheet, just for the knowing, no problem seems with this here. And also the MJE3055 has a f_T=2MHz (a frequency where its Beta gets reduced to unity.)

So returning to my first question of the common on-time for Q11 and Q12 switches, whenever this common switch-on happens, then the battery gets short-circuited by these switches via the coil L1, right?
And assuming your measured current of between 10uA to 110uA means an average current, there must be much bigger peak currents flowing because the 55.7V battery pack is shorted by Q11 and Q12.  Maybe you have checked this already with a series small value (0.1-0.5 Ohm) resistor's voltage drop, observed by the scope?

One more thing on the switch: the MJE3055 has about a 60V collector-emitter breakdown voltage limit, this means  leakage current near the 55.7V battery voltage may start increasing, hence some current may flow through in the off state too, thinking on the undriven but included Q3, Q4 and Q8 too.

Finally I would like to know how you mean the 0.5 pico second on the last scope shot? (quoted in bold by me below)    Maybe a misprint?

Also, it is ok you wrote it is a 10V pulse instead of the 100V but I still wonder if I see the total amplitude of the negative pulse in your first scope shot or simply the very bottom of the peak amplitude is not shown?
I ask this because at 0.05V/DIV range setting I can see a max of 3.5 vertical divisons for the spike which would give about 1.75V, not 10V. Is this ok?

This circuit behaves strange for sure, I wonder if the battery voltage kept increasing steadily, after your report in Reply #140?

Regards, Gyula

Sorry the delay to answer you. The voltage peak is off the screen on the scope and it is around 8v. I put the scope on 5v div and it goes almost to 2 divs.

The time division is actually uT (micro) not pico. Sorry again for my bad science measurements. I know that because the nob of the scope (off course).

I just found out that my Q11 is cooked and it is always shorted. I dont know for how long has been like that , so I guess all my measurements are contaminated.

I let the system run for 5 days untouched and the battery voltage goes up above the initial charge and than goes down below the initial voltage and than it goes up again and the whole cycle repeats. Very strange indeed but I dont know when the Q11 cooked.

Fausto.

[gyulasun]

Hi Fausto,

Ok, thanks for your answer, I understand and keep up good work!

Rgds,  Gyula

[Magluvin]

http://www.youtube.com/watch?v=6VRtohiKNns

New vid using Watt's UP meter to show power being used on my motor setup.

By the way, I really like what you guys are working on here also. Very cool stuff.

Magluvin

[Magluvin]

Sorry guys, the readings in the last vid were inaccurate. I just checked and the Watt's UP meter is only accurate above 4v. Found I had mixxed up batteries and they were not all fully charged. Will do new vid in a lil while.
Ill have more light also, YT processing darkens it quite a bit. My camera replayed the vid great.

Magluvin