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obbyone
New Member
2 Posts |
 Posted - Nov 12 2009 : 6:55:46 PM
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Hy everybody,
Question from a newbie. Is there someone who can tell me about the simplest DC/DC power supply possible.
Input should be 12V DC (automotive battery) and output 3kV DC. The power needed is 1200 W (I know this is a big value).
I need this to be created from scratch, with simple parts to be used.
I was thinking about an air core transformer (simplest I said) so I've been told that a frequency around 50kHz, a 555 and a transistor (MOSFET or else) to "choke" the 12V DC could be used.
If you have simplest and better idea, please tell me.
If you can give me a better value for the choke frequency. The best number of wire turns, The best air core diameter.
I know everybody try to prevent transformers from loosing energy, but this is not the priority here. The simplest the better.
Thank's |
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audioguru
Nobel Prize Winner
Canada
4218 Posts |
Posted - Nov 12 2009 : 10:41:04 PM
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A 1200W inverter might draw 1500W which is 125A from the 12V battery.
If the battery does not explode or boil dry then a charge might last a half an hour then the battery will be discharged too low and it will be ruined. |
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obbyone
New Member
2 Posts |
Posted - Nov 13 2009 : 05:47:54 AM
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Thank's for your prompt answer.
So, let's take the battery out of the project. Let's say we are directly plugged on a nuclear plant that by any mean gives 12V DC ;-) . Is there a mean to get a DC/DC converter that is kept simple as I mentioned earlier.
Thank's |
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audioguru
Nobel Prize Winner
Canada
4218 Posts |
Posted - Nov 13 2009 : 10:33:54 AM
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You need to order the huge and expensive custom-made transformer.
You need to design the circuit that switches 125A into the transformer without blowing up. Then order parts for it and wire the circuit together (BIG wires).
You might make 5 of them before you have a circuit that works and does not blow up. |
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Nov 15 2009 : 10:18:58 AM
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What exactly are you trying to do? What do you want to power with this thing?
You will still have to make or have made a large and expensive transformer, but you can get by with off the shelf on the switching circuit. PWM DC motor controllers are fairly cheap these days, so pick one up of the appropriate rating and set the duty cycle to 50%. Now choose a frequency that agrees with your transformer. Might save some expensive silicone smoke.
I have a feeling what you want to make has something to do with increasing fuel mileage in cars. If that is the case, just stop and don't waste your time because it won't work. |
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Simplest power supply ?
