Rene/Meissner EMF Higher Voltage Charger Variant

[SkyWatcher123]

Hi all, finished the charge/load test on the solely aum oscillator circuit, using only the flyback recovery through 2 parallel diodes, using 33 volt input, total average watts input, 3.63 watts.

The charge transfer efficiency was lower, around 81 percent, though probably more like in the upper 70 percent range, because the input power increased a little, around the final 1-2 hours of charging.

So splitting the negative, through the oscillator coil, is indeed, much more efficient at charging batteries.

Also, for long term normal battery charging, the rene/aum circuit, or the rene/sucahyo circuit, is probably best, to avoid any potential of the battery turning into more like a capacitor, which would not be compatible with the majority of loads.
Comments welcome.
peace love light

[gyulasun]

Hi SkyWatcher,

Thanks for all your efforts and for sharing the results.

The so-called 'splitting the negative' charging circuit is expected to charge with a higher efficiency
than the flyback recovery alone because the switching transistor connects a lower voltage battery
in parallel with a higher value voltage source so charging happens during the switch ON time and
also during the switch OFF time.

Keep up the good work.

Gyula

[SkyWatcher123]

Hi gyulasun, thanks for the positive words.
Yes, that about sums it up, pulse on charges and pulse off still charges battery and helps remove any sulphate buildup on plates.

I tested the rene/aum circuit with 20 volt input and was around 90% efficient.
So, 90% or higher is the base line for this circuit.

I do wonder, if charging a lower voltage charge battery, would yield higher efficiencies.

Perhaps a large bank of 1.2 volt nimh cells in parallel, or 6 volt lead acid batteries.

I think the charge battery voltage, that is limiting our useable oscillator voltage, plays a large factor in limiting the efficiency, maybe.
Thoughts welcome.
peace love light

[gyulasun]

Hi SkyWatcher,

I think the different battery types need charging treatments, methods that do not ruin them on the long run. 
Maybe pulse charging does not fit to all type of batteries universally and the amplitude of the pulse current
should be well controllable, to find the best 'treatment' for any given battery type. 
An interesting pulse charge test with a Nickel-Cadmium battery is worth knowing of:  http://jnaudin.online.fr/html/scalchrg.htm   

If you wish to charge a lower voltage battery, then the amplitude of the pulse current can become higher
than when charging a higher voltage battery in the same oscillator circuit.  This is because you simply increase
the voltage difference between the input supply and the battery to be charged and higher voltage can drive
higher charge current into a lower voltage battery. (Here would come into play a variable duty cycle control
possibility or a variable voltage source for the input supply as you have it.) 
So far you have adjusted and achieved the best conditions for charging the given or chosen battery and found
the favorable input supply amplitude empirically (and other parameters of course) where overall efficiency was
above 90%, at the given duty cycle your circuits ran.
It is very likely that when charging the lower voltage types like 1.2 V or say 6V, you would need to find again
the optimal input supply amplitude so that their voltage difference should drive the optimal amplitude charge current.

If you have means in your circuit setup to control the two charging currents during the ON and OFF times, then
most probably the overall efficiency would be over the +90% efficiency range, no matter what voltage level the
charging battery has. Such means include the variable supply voltage source to establish the correct charge current
for the oscillator ON time and the turns ratio of the transformer and / or voltage doubler at the secondary to set
the charge current for the oscillator OFF time. This way the low voltage battery types could not be the limiting factor
in efficiency.
You mention a bank of battery cells  in parallel  for the low voltage battery types while charging: care should be used
here if there are differences between the cell voltages and / or internal resistances because in that case charge currents
would vary for the individual cells. 

Gyula

[SkyWatcher123]

Hi gyulasun, thanks for the good information.
I am going to try the full wave voltage doubler with this rene/aum circuit, using 8 strand primary, and 4 strand secondary, connected to the doubler.
Since my amp meter readings on the previous tests using the voltage doubler may not have been accurate, meaning reading too high.
Will do charge/load test to know true charge transfer efficiency as usual.
The only thing about using the voltage doubler, I think the spike desulphating function would be much reduced, so this design would be for more normal pulse charging.
peace love light