ultra high current adjustable DC-DC converter (100 amps plus?)

[SArepairman]

So, does anyone know of something that might be able to DC-DC convert 100-200 amps variably?

like making a 0-30V supply out of 12V input.

does it exist?

can you maybe parallel up 10 of those eBay 10 amp DCDC converters?

[amyk]

Do you mean 12V at 100-200A, or 30V at 100-200A ()? Big difference there, but either way it's not a trivial amount of power.

[ptricks]

You would need a 500A 12V supply to give you 200A 30V and that is a huge amount of DC to source.
No the converters on ebay will not work, you need a circuit designed specifically for that output.

[Rasz]

its 'only' 6KW
I saw tesla inverter teardown somewhere  with custom transistors, 200KW

[robrenz]

Get an inverter based Tig welding supply.  If it has to be DC input, insert your DC to the circuitry instead of the built in rectifier/filter section.

[poorchava]

500A from 12V will probably mean car battery.  Even then you would have to parallel like at least a few of those (iirc a diesel car batteries from reputable manufacturer like Varta are rated at up to 1kA PEAK). Even stupid conductor for current like that would be something along the lines o inch or two in diameter.

For a transistor you would need a REALLY large igbt or mosfet pack and a really strong gate driver. 

Obviously this sort of power levels are totally deadly.  Maybe not from electrocution (low voltage)  but from exploding parts and pieces of molten material.  And this is not and overexaggeration...

[SArepairman]

I meant a 100 amp input @ 12 v, so less at 30V.

Why can't I parallel up a bunch of 10 amp converters? unequal load sharing?

[Bloch]

So, does anyone know of something that might be able to DC-DC convert 100-200 amps variably?

like making a 0-30V supply out of 12V input.

does it exist?

The safe/easy way will be to take a standard 12VDC to 230VAC converter. And then use a "standard" power supply.

[ptricks]

I meant a 100 amp input @ 12 v, so less at 30V.

Why can't I parallel up a bunch of 10 amp converters? unequal load sharing?

It might be possible that you can parallel converters, but this is one of those situations that can't be answered without a lot more details.
What is the load , is it inductive ?
Is the load constant or varied ?
How important is the regulation ?
Is short circuit protection required ?

[c4757p]

Why can't I parallel up a bunch of 10 amp converters? unequal load sharing?

I would say "safety". There is a huge difference in safety considerations from 10A to 100A, and ten 10A supplies in parallel will have the behavior of a 10A supply, not a 100A supply. They're not designed with nearly as much care.

[SArepairman]

I meant a 100 amp input @ 12 v, so less at 30V.

Why can't I parallel up a bunch of 10 amp converters? unequal load sharing?

It might be possible that you can parallel converters, but this is one of those situations that can't be answered without a lot more details.
What is the load , is it inductive ?
Is the load constant or varied ?
How important is the regulation ?
Is short circuit protection required ?

spectrum analyzer and no 

I was just curious about it,
Do you guys know of any companies which do sell monster DC-DC converters?

[c4757p]

Spectrum analyzer? Huh? 

[Rasz]

arent those usually 110/240V?
just get a 2KW car inverter, should be below $200

[ptricks]

I was just curious about it,
Do you guys know of any companies which do sell monster DC-DC converters?

They exist, but I hope you have a lot of money, eaton makes them all the way up to 40KW.
http://dcpower.eaton.com/dc-products.asp

[Psi]

He's the biggest i could find with some quick googling but it downst meet your specs.
The output is only variable between 24V and 27V. and only 55A for 10min / 23A cont @ 12V in

PVTC605-12-24-MIL  $978  http://www.powerstream.com/dc-12V-24V-extreme-25A.htm
Input 10.5 to 18 VDC
Output 24, 24.5, 25, 25.5, 26, 26.5 or 27 VDC (User adjustable by a DIP switch)
Output current 55 Amps  (10 minutes maximum)

[ptricks]

He's the biggest i could find with some quick googling but it downst meet your specs.
The output is only variable between 24V and 27V. and only 55A for 10min / 23A cont @ 12V in

I know eaton has some as I have seen them used as APU on aircraft. They might be special order though.

[amyk]

Spectrum analyzer? Huh? 

An SA using several kW? Sounds more like a spectrum obliterator to me...