Doing stuff at Resonance

[nilrehob]

Hi all,

I have been doing some experiments with resonance and found out that charging batteries in series is interesting:

nilrehob - YouTube

Now, I have another idea, but unfortunately I don't have any suitable parts available, I have to find some somewhere and it will probably take some considerable time. But I'll let You all know so that if you have the time and parts You can try it out.

1) Hook up all generator-coils in series to create a HV source. We just want the voltage and very little current. The higher the voltage the better.

2) Get all AC caps You have that can handle the voltage above and put them in parallel. The higher the capacitance the better. The lower the ESR the better.

3) Make an external-coil that will be in resonance with Your caps for Your favorite frequency. The lower DC-resistance the better. I guess air-core is best to avoid saturation.

4) Get a FWBR and a battery to charge.

5) Connect the external-coil, the cap and the FWBR in series. This will form the resonance-tank charging the battery in series.

6) Have an optional switch across the AC-legs of the FWBR.

7) Connect the generator-coil across the cap in series with a resistor.

8) Tweak ;-)

Here is a Circuit Simulator Applet circuit to view:

$ 1 5.0E-6 2.3728258192205156 50 5.0 50
v 144 176 144 240 0 1 237.0 442.0 0.0 0.0 0.5
c 288 176 288 240 0 3.0E-6 -73.87328090085299
l 432 176 432 240 0 0.15 -1.6123980849340434
v 528 272 528 208 0 0 40.0 5.0 0.0 0.0 0.5
w 288 176 432 176 0
r 144 176 288 176 0 2000.0
w 144 240 288 240 0
s 336 320 400 320 0 1 false
d 336 240 368 208 1 0.805904783
d 400 240 368 208 1 0.805904783
d 368 272 336 240 1 0.805904783
d 368 272 400 240 1 0.805904783
w 288 240 336 240 0
w 400 240 432 240 0
w 336 240 336 320 0
w 400 240 400 320 0
w 368 272 528 272 0
w 368 208 368 144 0
w 368 144 528 144 0
w 528 144 528 208 0
o 0 64 1 291 20.0 9.765625E-5 0 -1
o 3 64 1 35 10.0 9.765625E-5 1 -1

/Hob

[wrtner]

Now, I have another idea, but unfortunately I don't have any suitable parts available

What exactly do you need?

[nilrehob]

What exactly do you need?

Basically I need a bigger AC cap, but also a suitable external-coil that can handle the current without saturation forming the LC tank for my freq of choice, maybe also a FWBR for the current as well. I'll get them, but because of some personal matters it will take some time.

The idea is based on the following theory: a battery being charged has two basic characteristics, a voltage-drop of 12V (like a diode but bigger drop) and
a tiny resistance well below 1 ohm.

So being in series with a resonant LC-tank with high voltage where the significance of the voltage-drop is reduced must be beneficial.

In order for the current to be usable the caps has to be as big as possible as the theoretical peak current in a resonant LC-tank is I=2*pi*k*f^2*C (where k=V/f for the unloaded gen-coil, in my case k=2) which means high freq and big cap is good.

Now the question is: how to drive the LC-tank? This is where I came up with the idea to have the coil in the LC-tank separate/external from the generator since the current is what lugs the wheel. So let the generator-coils deliver the HV/Low amp and let the external-coil deliver the Hi amp when in resonance.

The low DC-resistance in the LC-tank versus the high DC-resistance in the generator-coil will direct the circulating-current to the external-coil and not
to the generator-coil.

I'm not sure it will work, as I said I need better caps to test it and also make an external-coil that can handle the current.

/Hob

[mainsen]

interesting setup u have. I like it. Though i see a problem with that simulation. U didnt put resistors for wires, coil and battery, but all these things have resistance. Also im not sure u can use that voltage source for simulating a battery.

kind regards,
mainsen