SS Overunity battery charger

[CatVomit]

Exactly, I am recording my 2nd attempt now. Unfortunately, this whole process will take some time... I was originally going to make the next video about endurance by comparing the longevity of the Fully charge batteries vs the pulsed charged ones.

However, by looking at the meters i have set up right now, it is showing me about 110% efficiency. Only time will tell..... I'll show the results regardless of the outcome.

[ewizard]

Thanks for sharing your setup CatVomit. I haven't read everything yet in this thread but after seeing your video I would like to bring up two things to think about. I've had a lot of experience with NiMH and Nicads for a very long time and have noticed that an essentially dead NiMH or one down to 1.2 volts or less can come up to full voltage in roughly 30 seconds more or less but that doesn't mean they are fully charged by a long ways. And when they are brought up quickly (and I'm not talking about hitting them with a lot of amps - I use a Maha charger that can control the current in charging and often use only 200 to 300 ma.) Even with a one minute charge they can put out a lot of brightness with an LED flashlight but it won't last long at all if they have had a short charge time. Bottom line is that charge voltage readings on NiMH and Nicads can be very misleading as to how much power they have available.

The other point is that comparing brightness of a light by eye is very misleading. I spent many years on a flashlight forum and I can tell not only from info there but from personal experience that without a Lumen meter you can't tell 500 Lumens from 600 Lumens and it often takes at least double the brightness (in lumens) for the human eye to detect even a slight difference. A while back I bought a high quality flashlight rated at 650 Lumens and compared it side by side with the exact same flashlight (but different emitter) rated at 500 Lumens. I could see no difference. Then I got out the Lumen light meter and checked each one and there was OVER 150 Lumens difference between the two.

All this is not at all intended to discourage you in your research. I am always very interested in battery charging and anything with more efficiency or COP > 1 is of great interest. Based on some of what you have presented you have a better grasp of much of this than I do but I am not sure if you were aware of the two things I brought up.

BTW take care of that cat - they are special animals. I've found cats are very picky about their water and if it's even a bit dirty they like to jump up in sinks in search of cleaner water but unfortunately there is often soapy water there and they don't seem to know the soapy water is bad for them and that will often result in the puke problems. It can of course be a lot of other things but that's my experience.

One other small point if you want others to replicate and share their experiences it's always good to provide a schematic and parts list even if it's hand drawn.

Ah and to EF

[CatVomit]

Hi Ewizard,

You are absolutely correct about the batteries. I knew something wasn't right when it was showing me about 600% efficiency because I was expecting around 120%. Someone pointed out in the youtube comments that it may be a surface charge and I think he was right.

I'm in the process of discharging the batteries now with the same flashlights. I will compare the run times between freshly charged batteries vs pulse charged batteries. This will take a while though (normally 5 hours).

[Farmhand]

Hi Cat, my multi charger that I use to charge AA, AAA and 9 v batteries tells me
that it charges AAA Ni MH batteries (1300 maH capacity) for 14 hours. I don't
know how much power it applies to each battery, I guess I could test it, which
would be interesting because it does charge them up real good with a strong
charge to just over 1.4 volts. I should test it with a depleted battery and check
the current input several times during a charge, if I can remember. I can
measure it at the beginning and end, easy enough to remember that.

It mustn't use much charge current because if I leave it to charge for 24 hours
it doesn't overcharge the batteries. My guess is that as the battery voltage rises the
current falls due to a constant voltage applied by the charger, just a guess.

Batteries have current limits which should be respected for the benefit of the
battery. Also unless you employ some fancy circuitry a boost circuit charger
needs to be supervised so as not to overcharge the batteries, especially
important with LiPo batts which can explode or catch fire with as little as a
couple of points over voltage when charging.

This is the big downfall of the "simple" Bedini systems. They have no charge
control or shut off, unless we build it to have that, then if we use a micro
controller to provide the switching signal we might as well call it whatever we
want as it would simply be a boost charger, which are common.

The only thing that is really "Bedini" is the trigger coil to provide the switching
signal. In my opinion. Other than that it is a simple boosting circuit.

If I was you I would change that arrangement to a parallel coil being switched
and use the other (identical) low voltage winding as the output coil like in the drawing
attached. This will give you transformer action on the energizing phase and
also direct the coil discharge. This would be a switched 1:1 transformer.

Once the second battery gets to the same voltage as the charge battery
the transformer action would not transfer any energy.
And batteries of higher voltage can be charged with it as well.
Plus it gives electrical isolation between the batteries.

Cheers

[CatVomit]

My Test 2 results ...... whew, i'm tired. These took a while to make.

https://www.youtube.com/watch?v=T0Qo-YJvALA

https://www.youtube.com/watch?v=1GzHe-nhnyU

Farmhand, That's a great idea .... I will probably try that next

[Farmhand]

Different experiments will give you different insights.

Cheers

[Farmhand]

No your not a dumbass, no one is. Just a note on the in-out power calculations. Volts x amps = power

If the input voltage is 9.58 and the input current is 0.113 A then that is 1.08 Watts input.

If the output voltage is 6.13v and the output current is 0.139 then that is 0.85 Watts.
To get efficiency we divide the output by the input so 0.85 / 1.08 = 78% or 0.78 C.O.P.
which is actually pretty good, considering all the connections ect.

With the cap there the circuit returns most all of the energy back to the supply when there is no load.

Also what you have made there is a kind of resonant charging circuit but your
transistor switch is in the wrong line, it should be on the low side for the
negative line to get the coil discharges, the way it is there on the high side
the coil has no current loop to discharge when the switch is off. A resonant
charging circuit is a kind of setup that when the switch is turned off the coil
discharges into the capacitor and charges it up to over the supply voltage.

Now if you change to a low side switch and then place a diode before the coil
to stop the energy sloshing back to the supply while the switch is off then
you will notice a difference.

I'll modify my drawing to show a resonant charging circuit before the transformer.

Won't be long.

When the switch turns on the coil is charged, then when it turns off the coil
discharges into the capacitor as it now has a complete current path to
discharge and the diode stops the capacitor discharging back to the supply
battery. It's a handy circuit as it increases the voltage that is applied to the
transformer coil on the successive pulses.

You could just replace the transformer with the charge battery.

With the high side switch up near the supply battery the coil cannot discharge
when the switch is off due to no current loop. You could use a high side switch after the capacitor I guess, I just like low side switches is all.

P.S. My apologies, I think I was looking at your circuit upside down. And back to front.
The convention is to draw them kind of like I did, more people will "get" the
circuit quicker. Supply battery to the left and positive line at the top.

If done right the charging circuit can work as a voltage doubler, usually it's a
bit less than double voltage on the cap after the coil discharges.

..

Nice cat, we've got a black barn cat, we only see it when it is sleeping or
having a snack or drink. It's not a people cat. But he is cool and a good
hunter. Keeps the rodents in the chook house in check.

EDIT: I had the input output figures back to front but the calculation result is
correct, i just wrote the in out figures wrong way round in the post.

..

[shylo]

Interesting Thread

Hi Vomit, A lot of great info, I used all my time up for videos' this month.
Farmhand, your posts are always very informative.
In your last attachment. can you replace the supplies with ,generating coils?
Can numerous coils be wound around the power coil, in order to be affected?
Use them to power loads, they may be small, but alot of small, can get real big, real fast.
artv

[Farmhand]

Yes Shylo the battery B1 can be any source of emf the blocking diode would half
wave rectify the input if it was AC but I would rectify it full wave and use a
smoothing cap before the blocking diode.

As many coils as wanted could be used but the total output will be relative to the input.

Cheers