Rene/Meissner EMF Higher Voltage Charger Variant

[gyulasun]

Hi SkyWatcher,

Returning for a little to the 100 Ohm instead of the 220:  I would think that in that circuit (Reply #53) if the
emitter resistor is reduced, then the emitter current increases, provided the 1 MOhm base resistor and the
20V boost converter input are unchanged.  So you needed to change something else to get the presently
6 mA emitter current for the 100 Ohm resistor,  I wonder.  (Just curious, of course feel free to change anything
whatever increases efficiency.)  And likely the 320 nF capacitor may need revisiting too as is the 22 kOhm
feedback resistor. For the latter you may probably use a 47 or 100 kOhm trimmer potmeter to test some values.

Gyula

[SkyWatcher123]

Hi gyulasun, I did not change anything, except the 220 to 100 ohm resistor that is in the emitter line.
As said, i notice the frequency has decreased and as it charges past 14 volts, the frequency increases noticeably.
So i assume, the lower frequency is causing the decrease of input and lower voltage across the 100 ohm resistor, since the on time is remaining constant, fewer pulses per second mean less input power.
Still working on the load test.
peace love light

Edit: Ok, i can already see the circuit needs tweaking when using the 100 ohm resistor on emitter line, based on the recharge time so far.
So I have lowered the 22 Kohm to 10 Kohm and placed a 100 nanofarad capacitor in parallel.
also reduced the 320 nanofarad to 100 nanofarad..
Will finish the charge with this new tweaked circuit and then start the load test again.

[SkyWatcher123]

Hi all, I'm making a new test, with the same rene/aum circuit.
Using 25 volt input and just a couple minor tweaks.
This circuit when charging the 12 volt lead acid tractor battery, achieved 92.3 % load test efficiency.

Am now going to test, using 3 lithium ion cells (taken from laptop) in series as the charge battery, for a fully charged voltage of 12.6 volts.
This test is to compare the load test efficiency to lead acid results.
Will post data when i have the results.
peace love light

[SkyWatcher123]

Hi all, i finished a charge/load test and the efficiency with the salvaged, laptop, lithium ion cells, was 99.1%.
The load used, was a 12 volt-7 watt led bulb. It used 7.1 watt hours, for the 1 hour discharge test.

I will make a couple more tests and get a better average and also take more meter measurements at closer intervals.
peace love light

[seychelles]

congratulation. you are getting the result you are wanting.
next try the new graphene supper cap/ battery.