To be deleted

[nul-points]

as i said, everyone is entitled to their own opinion...  using bad maths to try & justify it, however, is not acceptable

[Turbo]

It's all bad math based on theory and assumption and we tend to stick to the formulas and models that work best but the truth of the matter is that we don't have a clue about what is really going on.

[nul-points]

the operating cycle for the circuit, based on a pnp blocking oscillator, is as follows:-

-  drain 'half-cycle':
at power on,  the transistor switches on, the primary voltage rises and its current starts to charge the elcap via the coil and also to drive the main LEDs;

the antiphase secondary voltage drives the transistor harder with its low-level output;

when the primary winding saturates, the secondary voltage rises sharply, and turns off the transistor;

- feedback 'half-cycle':
the resulting output current pulse from the coil-field collapse is fed via the feedback LED and elcap, back into the supply battery;

after several cycles, the elcap charges to a steady DC voltage across the main LEDs, so that those LEDs are continuously lit throughout the cycle, not just pulsed once each cycle;

the elcap receives a current pulse via the primary each cycle, to restore the charge which is passed back to the battery during the feedback pulse;

although the feedback current is approx. 20% of the drain current, there is imperceptible ripple on the elcap, compared to its DC voltage


due to the feedback current opposing the drain current, the net supply current is lower than the drain current by approx 20% (in this circuit -YMMV!)


hopefully this is a factual and non-contentious description of the circuit operation

this is a simple circuit - you don't need to believe either the claims, or the counter-claims for its performance - i'm sure you're all well able to build, test & decide for yourselves


np

[itsu]

NP,

thanks for your description of your circuit.

I am terrible at math so i won't go there, but about this statement above:

due to the feedback current opposing the drain current, the net supply current is lower than the drain current
by approx 20% (in this circuit -YMMV!)

Are you sure the feedback current is opposing the drain current?
I mean, yes its of opposite direction, but it is shifted in time, see the screenshot of the supply current R1
in my post #81 here:
https://overunity.com/16384/flyback-data/msg527979/#msg527979

To me it seems that the supply current = drain current and then after the transistor is off, the supply current
stops, followed by the FeedBack current in the opposite direction charging the battery.

This FB current is part of the supply/drain current but time shifted, so one should not subtract it from the
supply current to get a new net supply current.

_{just my 2 cents,}  

Regards Itsu

[nul-points]

hi Itsu


thanks for your question, i understand what you're saying - we don't get a lot of experience of AC current with battery sources 


think of current as an amount of charge which could flow (in either direction) - if, say, two lots of the same value of charge flowed out of, and back into, a battery then technically it doesn't matter if those 2 flows of charge occurred in 2 sequential periods of 30 minutes (eg. driving a motor, then recharging the battery), or 2000 sequential mS periods of alternate flow direction

the important thing in our calculations here is to choose a regular period which contains the same number of each flow direction (it could be 1 of each, for one cycle; or many cycles each containing 1 of each flow direction). where each flow direction occurs within each cycle is not important

our 2 flow directions here have different average current value, but if you could make them equal then the net charge which has flowed would be zero (regardless of the total time period for the exchange) and the battery would be in the same state of charge after the test as it was before (except maybe temperature!)


i hope this helps - i don't think i've explained it well !


np