AG, Belfior,

frankly i have no idea what to expect here, signals sure look clean, and almost no spikes are seen like it should
according to V8Karlo.

No resonance involved also as far as i can see, just nice square wave signals between 10 and 100Khz.

We do transform from DC to AC (push pull) and via the feed back loop across C2 back as DC to the source.

I have 2W input and 650mW across B1, meaning we use 1.350W in the Controller/Push Pull section.


I do expect V8Karlo to comment now on how to improve on / correct this circuit so it matches his expectations.

Regards Itsu

Hi Itsu,
V8Karlo emphasises spike generation in his text, so I have an inkling that he may have a very poorly constructed circuit generating spiky waveforms and getting false readings on his multi-meter.

Hi Itsu,
V8Karlo emphasises spike generation in his text, so I have an inkling that he may have a very poorly constructed circuit generating spiky waveforms and getting false readings on his multi-meter.

Hoppy,

yes, that could be, therefor any input from him would be appreciated.


Void,

yeah, if you include the TL494 and IR2113 power, like it should.
Its also like you mentioned, with feedback the input goes up big time.

Itsu

Hi guys

Itsu thanks a lot for the update.
 The low amount of current that returns back, is mostly due to the fact that the total voltage potential across Czero and L1 is lower than what V8Karlos thinks. Circuit presents a steady 12V across eacch one of them which is not true.

V8Karlos
Note1: In a similar way of thinking, a capacitor in series with the input voltage will also collect some potential which can be added in series with Czero and L1 (Look attached drawing). I have already tested that in an other device and i collect back the half of the consumed energy over a half of cycle. I'll post more on this later as i am at work right now.

Note2: Push pulls don't look quite the best choice for this teqhnique as it is beter for me to give some time for the energy to go back before we fire again.
Rregards

Hi Jeg. What is the approximate efficiency you are seeing?
(ratio of approx. output power to measured input power?)

Hi Void.
I worked with a very inefficient transformer with huge flux leakage. Perhaps you have seen it at Piere's thread. So any approximation would be wrong. 

Hi Jeg, It seems to me you should be able to at least roughly approximate the efficiency without too much issue, but OK.

Hi Jeg. Ok, I thought your were still testing with V8Karlo's 'Q' circuit setup.
Your setup sounds interesting. All the best... 

Hi Itsu
My test with v8 q-topology wasn't successful as I said above. I take back just 100mA when my battery pushes 2Amps. So efficiency wasn't raised at all.

As I understood, V8karlos showed just a way and not a ready device as he explained.

Hi Jeg. No, that is not correct. He said the following about his 'Q Device' circuit:
"Most of the output energy is returned to source."
"The Q device is simpler than Zero device and it has feedback which returns good
portion of energy to source while light bulb B1 at same time."

The implication apparently was that it should greatly improve efficiency over powering the bulb directly,
otherwise what would be the use of the circuit if it is less efficient than driving a bulb directly
at the same output power level?

V8Karlo mentions that there should be lots of spikes at the output of the coil,
so you may need to remove the snubber circuits on your PWM to replicate V8Karlo's 
setup, but V8Karlo should be able to clarify about what he was doing to get those spikes.

Well where is Karlo? it would be nice to hear his point of view