Low voltage DC power supply 5kW
Low voltage DC power supply 5kW
(OP)
I need a variable DC power supply (0-100 V) to supply about 100 amps for some experiments. I have looked around and most seem sophisticated and expensive (over 5k)
Anybody know of cheaper solution or is this only to be expected at this power level?
Was messing around with car batteries and large resistors to control current. Cant find a rheostat big enough.
I have 3 phase.
thanks.
Anybody know of cheaper solution or is this only to be expected at this power level?
Was messing around with car batteries and large resistors to control current. Cant find a rheostat big enough.
I have 3 phase.
thanks.





RE: Low voltage DC power supply 5kW
Please clarify, your subject says 5 kW but your application says 100V @ 100A which is 10 kW.
Some of the extra expenses seen will be related to regulation and ripple of the output, which is also unknown.
RE: Low voltage DC power supply 5kW
It depends what you're up to. Especially the stability, precision and adjustability requirements.
Also, do you need adjustable voltage? Or adjustable current?
RE: Low voltage DC power supply 5kW
Current is the most important issue so current controlled would be preferable.
As far as stability goes we will have to see.
Thanks again
RE: Low voltage DC power supply 5kW
Why not use a saltwater rheostat? Nothing cheaper and they run up to megawatt ratings.(sealed dumpsters)
Use two metal plates facing each other in a container. Add salt. The distance between the plates controls the current.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Low voltage DC power supply 5kW
RE: Low voltage DC power supply 5kW
http://www.bruker.com/current_regulated_ps.html
http://
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RE: Low voltage DC power supply 5kW
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If we learn from our mistakes I'm getting a great education!
RE: Low voltage DC power supply 5kW
http://www.sprint-electric.com/products.php
used to be quite a simple basic DC drive but now gone all digital but still pretty basic stuff.
RE: Low voltage DC power supply 5kW
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If we learn from our mistakes I'm getting a great education!
RE: Low voltage DC power supply 5kW
RE: Low voltage DC power supply 5kW
You can do a ratio between the engine RPM that the alternator starts charging at to the maximum engine RPM. The alternator will put out about that ratio times 14 to 15 Volts.
Example, The alternator starts charging at 800 RPM, maximum RPM is 5600 RPM. The ratio is 5600/800 = 7. Expect about 7 x 15 Volts or 105 Volts at that speed. (Make allowance for the ratio of engine speed to alternator speed.)
You can control the output with a small field current.
If you need more voltage, change pulleys and spin it faster.
You won't get something for nothing. The drive motor must be powerful enough to supply the energy that you want to develop.
Bill
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"Why not the best?"
Jimmy Carter