Author Topic: My first and only capacitor bank  (Read 501 times)

Offline DrewScott

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My first and only capacitor bank
« on: December 20, 2020, 12:46:50 AM »
Here is my 64uF @ 4270v capacitor bank. It has 3 options on top for firing: a cylindrical coil for can crushing, a pancake coil for ring launching, and two clips for attaching wires to be exploded (with blast shield). There is a switch on top to select the desired option. It is discharged using a high voltage relay that I added tungsten contacts to so they wouldn't ablate themselves away. There is a hv diode acting as a half wave rectifier for the charging circuit. There is also a 5 megaohm hv resistor across the caps acting as a bleeder for safety, and an Incandescent bulb in series with the charging primary acting as an indicator of level of charge. It crushes cans ok, and launches rings pretty well. It will also explode wires fairly well if they are small enough.

Offline DrewScott

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Re: My first and only capacitor bank
« Reply #1 on: December 20, 2020, 05:11:09 PM »
What would be a good way to indicate when the cap bank is fully charged, other than checking the brightness of the bulb in line with the hv primary?

Offline Da_Stier

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Re: My first and only capacitor bank
« Reply #2 on: December 20, 2020, 05:31:28 PM »
Nice build, I like how the terminals on top kind of look like some lego bricks.  ;)

The obvious solution for getting the state of charge is to just measure the voltage through a voltage divider (made from HV resistors).

You could also measure the capacitor voltage relative to the supply to get the difference between them.

If you don't want to deal with any high voltages you could also put a current shunt on the low side of the charching voltage.
This way you can measure the current which should go to 0 when the caps are fully charged.
Being in the lowside, you can simply hook up a multimeter directly across the shunt.

A more theoretical approach might also be to monitor the charging voltage and current and integrate the energy that has been transportet into the caps.

I hope this gives you some ideas on what might be interesting to try.  :)
Greetings,
Michael

Offline DrewScott

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Re: My first and only capacitor bank
« Reply #3 on: December 20, 2020, 07:26:29 PM »
I like the idea of the current measurement of the low end of the charging circuit. I guess that is what the bulb currently indicates (pun intended) but it would be great to have some numbers to go along with that. I did some YouTube learning about shunts and ammeters and how all that works. That'll be the next addition.

Another question: I currently have the half wave rectifier on the hv end of the charging circuit. Would it make any difference or be better if I put it on the low voltage end? And would the fact that it is half wave rectified with no smoothing cap affect the current reading?

On a different note, I'm trying to figure out more things to use this capacitor bank for. So far I've crushed cans, exploded wires, launched rings. What else could I use this for? Thanks!
« Last Edit: December 20, 2020, 09:34:20 PM by DrewScott »

Offline MRMILSTAR

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Re: My first and only capacitor bank
« Reply #4 on: December 21, 2020, 04:56:32 AM »
I built a pulsed power generator several years ago. It can store up to 24,000 joules. I use it to shrink coins, crush cans, and launch discs. I use a NST to charge the capacitor. To monitor the charge level, I use a microammeter with a 25 microamp scale. I place a 1 gigaohm HV resistor in series with the microammeter. In doing so, the meter now reads in kilovolts instead of microamps. I just watch the meter as I apply charge.

I use two meters. One meter is for monitoring the voltage level of the capacitor during charging. The other meter is for monitoring the capacitor voltage level during bleed-down. The bleed-down meter is bipolar to allow for the possibility of positive or negative residual charge on the capacitor due to voltage reversal. The charging meter is disconnected during firing and bleed-down. The bleed-down meter is only connected during bleed-down.
« Last Edit: December 21, 2020, 05:38:33 AM by MRMILSTAR »
Steve White
Cedar Rapids, Iowa
Retired electrical engineer

Offline Da_Stier

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Re: My first and only capacitor bank
« Reply #5 on: December 21, 2020, 10:25:17 AM »
Another question: I currently have the half wave rectifier on the hv end of the charging circuit. Would it make any difference or be better if I put it on the low voltage end? And would the fact that it is half wave rectified with no smoothing cap affect the current reading?

It should not make any difference on which end you place your diode. The capacitor bank acts as its own smoothing capacitor anyway.
Just make sure to place the shunt on the capacitor side of the diode.

On a different note, I'm trying to figure out more things to use this capacitor bank for. So far I've crushed cans, exploded wires, launched rings. What else could I use this for? Thanks!

You could build a coilgun and shoot "normal" projectiles.
You could build a railgun, however the energy of your capacitorbank might be a little bit on the small side for that.
You could build a Ruby laser if you connect a flashtube to it.
You could do a lot of plasma physics, which would however require a vacuum chamber.


Greetings,
Michael

Offline DrewScott

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Re: My first and only capacitor bank
« Reply #6 on: December 21, 2020, 01:46:19 PM »
Could you expand on the plasma physics? I actually am building a vacuum chamber right now for a demo fusor. It isn't quite finished yet, but it should work once it's done.

Offline MRMILSTAR

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Re: My first and only capacitor bank
« Reply #7 on: December 21, 2020, 04:23:12 PM »
Exploding fruit is another entertaining "use". Your capacitor bank may not be able to store enough energy though. Maybe a grape?
Steve White
Cedar Rapids, Iowa
Retired electrical engineer

Offline Da_Stier

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Re: My first and only capacitor bank
« Reply #8 on: December 21, 2020, 04:58:46 PM »
Could you expand on the plasma physics? I actually am building a vacuum chamber right now for a demo fusor. It isn't quite finished yet, but it should work once it's done.

Sounds great, how do you plan to get your hands on Deuterium, can you just buy it where you are?

Regarding the capacitorbank, I thought about accelerating and / or compressing plasma.
You can use an electromagnet to "compress" the plasma to reach incredible energy densities, however you will generate some pretty serious EMP emissions, so be careful.
Another thing is "pulsed nuclear fusion" which is some state of the art plasma physics.

With the help of a vacuum chamber, you might also be able to do some plasma coating and metal vapour coatings.

Exploding fruit is another entertaining "use". Your capacitor bank may not be able to store enough energy though. Maybe a grape?

I like the idea of an exploding grape, it seems pretty silly but incredibly funny.  :)
Greetings,
Michael

Offline DrewScott

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Re: My first and only capacitor bank
« Reply #9 on: December 21, 2020, 05:26:02 PM »
I am only planning on building a "demo" fusor at first that won't use any Deuterium (and won't actually be fusing) as a classroom demonstration. Visually it won't look any different and will be much safer for students. Once I get that figured out, v2 might actually use Deuterium. I will cross that bridge when I get there.

Offline DrewScott

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Re: My first and only capacitor bank
« Reply #10 on: December 22, 2020, 03:48:45 AM »
 Does anyone have any experience using a capacitor bank as a power supply for a single shot induction coil?

Offline johnnyzoo

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Re: My first and only capacitor bank
« Reply #11 on: January 06, 2021, 04:56:28 PM »
I like the idea of the current measurement of the low end of the charging circuit. I guess that is what the bulb currently indicates (pun intended) but it would be great to have some numbers to go along with that. I did some YouTube learning about shunts and ammeters and how all that works. That'll be the next addition.

Another question: I currently have the half wave rectifier on the hv end of the charging circuit. Would it make any difference or be better if I put it on the low voltage end? And would the fact that it is half wave rectified with no smoothing cap affect the current reading?

On a different note, I'm trying to figure out more things to use this capacitor bank for. So far I've crushed cans, exploded wires, launched rings. What else could I use this for? Thanks!

Building a large flash lamp would be something I would try if I had such capacitors. Be careful - eye damage can occur both due to intense light/UV radiation as well as glass shrapnel in case the lamp explodes.

As for charging, I would use full-wave rectification instead of half-wave if possible. Is there a reason why you are using half-wave rectification? Multiplier circuit or something?

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Re: My first and only capacitor bank
« Reply #11 on: January 06, 2021, 04:56:28 PM »

 


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