Rene/Meissner EMF Higher Voltage Charger Variant

[SkyWatcher123]

Hi gyulasun, thanks for the helpful reply as usual.
Yes, I thought about that also, the frequency being important with that N. Tesla style coil.
Maybe I will visit that coil method again, later at some point.

Though for now, I will continue to try and improve efficiency of this rene/aum charging circuit.

I made a charge/load test of the updated 12 strand coil/core, since it now has some turns removed from previous testing.
I also picked up a new meter, this one has the 20 amp setting capability that is properly working.
Used the lithium ion battery as charge battery again.

Input voltage to circuit in this test was 20 volts at .18 A average current.
Circuit component values were altered for this latest test.

The circuit used 6.48 watt hours and the battery gave back 7.12 watt hours.
Which works out to 1.099 COP or 109.9% efficiency.

Any ideas are welcome, that may increase efficiency further.
peace love light

[gyulasun]

....
Any ideas are welcome, that may increase efficiency further.
...

Hi SkyWatcher,

To answer your question I can only repeat myself: with a switching transistor that has lower collector emitter saturation voltage specification than the 2N3055 say the ZTX types or with a power MOSFET that has say 20-30 milliOhm drain source ON resistance.   This way your switching device will have less loss than the DC resistance loss of your coil, presently your transistor loss seems higher than that of the coil, albeit it is small enough because the body temp of the 2N3055 is at room temp for your touch if I understood you well.

So practically you have approached the efficiency of you switching circuit pretty close  to 100%, there is room for small impovement in it, maybe not worth spending on a better switch at the circuit power level you are at (low duty cycle oscillator i.e. switch and the 0.18A average current via the switch) .
It is good that you again reached the higher than 100% charging efficiency for the 12 strand coil from which you removed some length of wire and managed to compensate it with tweeking other component values. 

Thanks,
Gyula

[SkyWatcher123]

Hi gyulasun, thanks for the kind words and helpful reply.
Ok, thanks for the suggestions, i will research a transistor that might be better to try, once i make these new experiments.

It is actually a TIP3055 NPN for the main transistor and it doesn't have much of a body to it at all, half plastic and a small metal backing on it, that has no detectable heat to my finger.

The new experiments will be with this 10 awg. stranded copper THHN house wire I just picked up.
Have a 50 foot roll and it is almost 2 lbs.
It is 19 strands and should be between .05-.1 ohms for 50 feet.
peace love light

[SkyWatcher123]

Hi all, was just looking at this 10awg. wire and the plastic former it came with.
Turns out, the ferrite tube core fits perfectly into the center, well with a little rubber mallet encouragement, though sure is convenient and the plastic coil former is also the exact length as the ferrite tube core.

Will be recoiling the wire at some point today and getting the core in place.
peace love light

[SkyWatcher123]

Hi all, i need to share an error.
Apparently, the previous meter was broken as suspected and the smaller and cheaper meter is also off a little, amp meter wise, because it only has 10 amp capability.

The new meter i feel is fairly accurate, as i also have a 1 milliohm current shunt for measuring higher amps accurately and it confirms the new meters accuracy.

I also used 8 data points for the discharge, checking amps and volts 8 times during discharge.
Also used 6 data points for the charging, checking only amps, as the voltage is stable from the boost converter.

Unfortunately, the charge/load test effiiciency with the new 10awg. house wire coil is only 94.7% efficient, charging the lithium ion.
I will test the 12 strand coil also and see how that compares.

Still not too bad i guess, sorry for the wrong data folks.
It's still a great charger though and who knows, maybe it can go over COP 1 somehow.
peace love light