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rocketman923`
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Join Date: Jan 2017
Posts: 25

High Pulsed Power

01/25/2017 6:00 PM

How could I make relatively inexpensive pulsed power without using a lot of capacitors?

I need 2500 amps or more (voltage doesn't really matter) with a pulse time of less than 50us. Also time between pulses isnt very important but if possible I would like it to pulse every second.

Any input would be much appreciated and ask if you need more details.
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Pathfinder Tags: circuits Pulsed power
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jack of all trades
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#106
In reply to #100
 Find in discussion

Re: High Pulsed Power

01/30/2017 2:24 PM

This is not a viable solution for supercaps.

Feel free to do a little research yourself into what it would take to step up a supercap bank to the requested voltage and pulse current levels or just take it from someone that works with high voltage and high current, MW-level short circuit test rigs and designs with supercaps and has his own full suit of arc flash gear for work.

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James Stewart
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#46

Re: High Pulsed Power

01/26/2017 4:55 PM

After I drilled down into this thread, I decided the best thing to do was to not give you ideas that will get you killed.

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rocketman923`
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#48
In reply to #46

Re: High Pulsed Power

01/26/2017 5:19 PM

I work in a university lab around professors. I will not directly be building this. I just want to learn. Please, any ideas will help.
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dkwarner
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#72
In reply to #48

Re: High Pulsed Power

01/27/2017 12:07 AM

In that case, it might be worth pointing out that spot welders commonly put out relatively short pulses of current in the thousands of Amperes. On the other hand, most spot welders use transformers to convert higher voltage, lower current pulses into higher current, lower voltage (a few volts) pulses, and the inductance of the transformers will probably lengthen the pulses too much for your requirements.

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truth is not a compromise
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#71

Re: High Pulsed Power

01/26/2017 11:54 PM

Here is a relatively straight forward (simple to build) device called a VIG that might be very useful for your project.

A Vector Inversion Generator functions as a compact combination of a pulse forming network, capacitor and voltage multiplier. It provides rapid pulse rise times, on the order of 10 of nanosecond. It multiplies voltage by a factor of twice the number of turns. It can provide high power pulses in a compact reusable format.

VIG

Hobbiest builds

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IQ
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#73

Re: High Pulsed Power

01/27/2017 8:02 AM

https://www.dnvgl.com/services/4-kema-laboratories-usa-4876

http://www.haefely-hipotronics.com/

These 2 might be worth giving a call. Kema for some additional advice and Haefely for what they may have available (AXOS-8),or some advice to suit your need.

Kema usually keep tested equipment for a while and if the client does not collect it at the expired time, they ditch the items. You may get something cheap and suitable for your experiment.
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rocketman923`
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#74
In reply to #73

Re: High Pulsed Power

01/27/2017 8:13 AM

haefely actually has almost exactly what I need. ill dig into it a bit more.

Thank you for the links
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IQ
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#80
In reply to #73

Re: High Pulsed Power

01/27/2017 9:08 AM

No hassle at all. Let us know how it goes and if the time travel is all that it is cocked up to be.
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jhotmer
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#77

Re: High Pulsed Power

01/27/2017 8:26 AM

Transformer from a small welder should do.
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marcot
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#78

Re: High Pulsed Power

01/27/2017 8:32 AM

Go for it Rocketman923!

Just be careful and make it safe. Think PPE!

The current you are talking about is not so bad and will not crush or vaporize a coil made of decent conductor. The 50uS pulse does not contain enough energy at this current. The scary pictures they showed on this blog are from experiments conducted with hundred of thousand of amps.

Current power semiconductors can handle this experiment. You will have to minimize loop inductance. which may be a problem as we are talking about a few centimeters between the coil, the bank, and the switch unless you use special wiring techniques borrowed from the RF people.

Have fun, but play safe.

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Andrew Westman
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#94
In reply to #78

Re: High Pulsed Power

01/27/2017 2:47 PM

If he keeps the coil resistance low, he needs only a few joules, but he was originally speaking of pushing 2500 A through 8.3 ohms for 50 us. That's 2594 Joules dissipated in about 1/3 gram of wire! If you consider the amount of material in his coil and assuming the specific heat of copper, it would take only about 140 Joules to raise the temp to its melting point: 1085C. So yeah, vaporising his coil was very real possibility at the outset of this discussion. However, a coil having only 0.102 ohms' resistance and just a few Joules will do. Keeping his coil (and circuit) resistance as low as possible is key.
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Andrew Westman (28); BertHickman (1); Brave Sir Robin (2); BruceFlorida (1); dkwarner (2); gutmonarch (2); IQ (9); jack of all trades (11); James Stewart (11); jhotmer (1); Just an Engineer (1); marcot (4); PWSlack (1); Rixter (3); rocketman923` (24); SolarEagle (1); tcmtech (3); truth is not a compromise (5); WJMFIRE (1)

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