Method to Dump cap voltage to Battery

[nvisser]

I came to the conclusion that I am not able to do this self switching without the help of a relay.
The other simpler circuit I post is the way I think I will try it on Monday. Still using a relay, but the relay could be a small 12v relay and will not carry all the current. It is used to trigger the transistors. The cap over te relay coil is to keep it closed for a while and ccan be changed to a value that works best. I think it will work.
I am switching the positive here as I find it difficult to do it the other way round as it will need a pnp for the relay switching I think.

This circuit works good. I charge 3 x 10 000uf caps in parallel up to 24v before discharging to the battery. It chose the cap over the relay coil a 100uf so it stay close long enough to discharge the 30 000uf caps fully to the battery.
It pulse twice per second and there is no contact burning because of the darlington transistors.The final transistor does get a bit hot and needs a heatsink.
I still think I will be able to do it without the relay. To do that I will have to use another transistor pair to disconnect the radiant source while I discharge the cap. That should make the circuit work, But will need a few more transistors. One inverter transistor and the darlington.

[Farmhand]

Yes that sounds very good,

I charge 3 x 10 000uf caps in parallel up to 24v before discharging to the battery.

I think that would be more energy dumped and dumped quicker than my 75 000uf at 18 v. I've got to get those transistors before I can build it.

I would like to use it the same way as you with SS multifiler, I don't think I need 8 strands, but with adjustable frequency and power draw the strands my be usefull in the future.

Thanks for the heads up that it's working.

Cheers

[sucahyo]

In US6677730 Device and method for pulse charging, Bedini mention exactly how to dump cap into a battery.

[Farmhand]

In US6677730 Device and method for pulse charging, Bedini mention exactly how to dump cap into a battery.

Thanks sucahyo, Thats a good read. "Charge - Float - Discharge" That is what I wanted to achieve with the "Alternating Capacitor Discharge Circuit" that I dreamed up "ACDC" for short, I reakon it would rock too, I will go back to that idea when I have learned enough about using mosfets, i'm very patient when I have to be.

The best way in my opinion to ensure a good floating charge is to have a moment when the charge in the caps is separated from both source and load between charge and discharge. And so as to not limit the source output or disconnect the source from everything, a second cap discharge circuit could be used working in tandem, in an alternating arrangement so that the source always has somewhere to put charge, while the cap or set of caps is discharging the source can charge the other.

I am going to make a detailed drawing but without the mosfet driver details, now that I have learned how to use "ExpressPCB" it comes with "ExpressSCH" which is the schematic drawing software, it is good and easy to use, free too.

Cheers

[wwdotme]

Hi nvisser
I'm using the schematic you posted on post 13 to discharge a cap
into to batteries in series. Only I'm running 2 small generators being
turned by my duel rotor bifillar ssg.

It seems to be working great since my out put voltage is only around 55v.
From what I have seen so far the circuit seems to be discharging around
30v over battery voltage. As the 2 dead batteries voltage came up so did
the voltage of the pulses. I don't have a scope or any thing to get an
accurate reading on pulses but my guess is 2.5 to 3 pulses a second.

Keep up the good work guys I learning alot.
Bill

[SkyWatcher]

Hi folks, maybe some have seen this effect before. Last night I was testing my small self oscillator circuit that is the same as the 'big boy variant' that I think ashweth posted awhile back. Well using 1.2 volt nimh input, I took a 45uf-370vac capacitor connected with the flyback diode and let the cap charge up and then shorted the capacitor and noticed on the input amp meter that the amps dropped from 48 milliamps to around 20 milliamps when shorted and if the cap is shorted or the diode is dead shorted back into the primary coil that it's still 20 milliamps.
I think I recall maybe others noticing this effect or maybe it's normal to these circuits, though it sure seems like it might be useful for a cap dump circuit setup where an oscillator is used to bump voltage up. Let me know your thoughts on this folks, thanks.
peace love light
Tyson

[boguslaw]

Please post oscillator schematic

[SkyWatcher]

Hi boguslaw, thanks for reply. I'm posting the big boy variant ss oscillator. Though In my experiment, I used a PNP TIP42 and for the two resistors, I used equal values of 1.5kohm each. Also the wire gauge is 22 and is wound bifilar of course on a ferrite bead of 3/4" diameter- 1-1/4" length- approx.3/8" inner diameter. The ferrite bead is fully wrapped. I ran the circuit today again to check what the no load amp draw of free running circuit and it is around 48 milliamps.
peace love light
Tyson


Uploaded with ImageShack.us

[boguslaw]

Hi boguslaw, thanks for reply. I'm posting the big boy variant ss oscillator. Though In my experiment, I used a PNP TIP42 and for the two resistors, I used equal values of 1.5kohm each. Also the wire gauge is 22 and is wound bifilar of course on a ferrite bead of 3/4" diameter- 1-1/4" length- approx.3/8" inner diameter. The ferrite bead is fully wrapped. I ran the circuit today again to check what the no load amp draw of free running circuit and it is around 48 milliamps.
peace love light
Tyson


Uploaded with ImageShack.us

is that resistor from positive terminal of battery to the transistor base really needed ?

[John_Bedini]

You Need Double

The battery is charged at 15.5, so you need 30.1 volts to be in the ballpark.
John B

I'm interested how much voltage need to be in cap before dump to battery. I would use it for 12V battery.Any experience ?
Did you thought about just using 1.5KE ALONE ? For example 1.5KE24CA ?

[blackchisel97]

The battery is charged at 15.5, so you need 30.1 volts to be in the ballpark.
John B

Thank you John

I got 6 filar AWG 18 running in solid state mode with inverted trigger - as you suggested while ago. Runs very well and charging rate with large batt. is impressive (my youtube vid). I have a question for you; would extra winding in opposite direction have same benefit as per Bit's application in 10 coiler, such as allowing to pull something out without circuit noticing? In theory (mine ) it should but I would like to know what is your take on that.

Thank you
Vtech

[SkyWatcher]

Hi folks, Hi boguslaw, It seems that resistor from battery positive to base is needed since it initiates the transistor to conduct starting oscillation and it also seems both resistors need to be equal in value for the circuit to operate best. I tried a smaller toroid with 24 gauge bifilar with this circuit and it did not have the same reduction in current when flyback output is shorted like the larger toroid with 22 gauage, so maybe the frequency matters or some kind of resonance is causing the reduction on load effect. I just thought this might be of use to someone, seeing that with right toroid and coil parameters it has no effect on source, instead it helps reduce consumption. Hi John B., nice to see you posting to the forum again.
peace love light
Tyson

[boguslaw]

SkyWatcher

Can you check if just a push button is enough to start circuit like in attached modified schematic ?

[thedude]

Nvisser schematic @ post #15 worked great for me!

Thanks so much for that schematic Nvisser @ post #15

I used a MBR2540 25 Amp Schottky Barrier Rectifier 20 to 100 Volts instead of TYN612 SCR as that is what i had around to work with. Also changed 470ohm to 100ohm.(470 was getting hot with 4 slave SSG) Also Zener is a 48volt. This works great with self oscillator though
I'm using this to power a CFL while charging really well !!!

Thank you so much.

[SkyWatcher]

Hi boguslaw, no i tried it and it needs the positive battery hookup with resistor to maintain oscillation. I notice my toroid is singing nicely, though it may just be because it's within audible range. Any ideas why other toroids i have don't have the same reduction in current on load effect as this one does?
peace love light
Tyson