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Old 8th October 2005, 03:29 PM   #1
MaXiZ is offline MaXiZ  Italy
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Default PC Power supply

Hi to all.
I've tryed to search here and on the web.
Did exist e schematic for this?
Car battery (12v) =>PC Power supply (+/-12V,+/-5V,+3,3V)??
I need to run a k6-233, 40Gb HD, Ati rage Pro PCI so i don't need so much power i think...
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Old 8th October 2005, 03:31 PM   #2
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Cheapest way to do this is with a commercial inverter, plugged into the regular AC power supply. They have really come down in price over the last few years.

If you need smaller, well, that's trickier.

Wes
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Old 19th November 2005, 04:43 PM   #3
MaXiZ is offline MaXiZ  Italy
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Ok just bought a power inverter (12V DC=>230V AC) of 400W.
On techincal data they say "Modified sine wave.
Now that's what happen..
Plug a lamp and it turn on!
Plug a PC and it doesen't turn on!
Why?
Any suggest or idea?
Thanx in advance
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Old 19th November 2005, 05:54 PM   #4
tade is offline tade  United States
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I only know a bit about this. The RMS voltage output of your device will be 230v, however the frequency and the amplitute of that sin wave will probably not be the same as your residential power. That said, inverters work perfectly for resistive loads like lamps and heaters, but could have trouble with systems which require that certain sin function.
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Old 20th November 2005, 07:03 AM   #5
MaXiZ is offline MaXiZ  Italy
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So i've to buy another inverter?
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Old 20th November 2005, 07:13 AM   #6
Tweeker is offline Tweeker  United States
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Why not switching regulators? Lots in these voltages available. Might be rather technical to implement though.

If we dont care about efficiency at all (ei, run off the alternator), you could use linear regulators.
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Old 20th November 2005, 07:17 AM   #7
MaXiZ is offline MaXiZ  Italy
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Could u explan a little better?
I'm not an expert..
What should i do exactly?
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Old 20th November 2005, 07:22 AM   #8
Tweeker is offline Tweeker  United States
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Switching power is beyond my ken in the minute details really, that was just a suggestion. This is the ultimate solution, but may be more challenging and/or expensive than other approaches.

A linear regulator is essentially just burning away the difference between voltage in and desired output. Glass smooth DC in exchange for heat.

LM338 datasheet has some examples.
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Old 20th November 2005, 07:35 AM   #9
Tweeker is offline Tweeker  United States
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Youve already got the inverter I see, for whatever reason your PC power supply is unhappy with it, lamps are alot more forgiving. Check that everything has the correct settings and connections.

Just to make sure, this pc works fine on the ac mains?
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Old 21st November 2005, 05:23 AM   #10
mflorin is offline mflorin  Romania
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In my opinion, inverter doesn't like the input capacitors of the pc power supply. I think that at the first moment, they look like a short circuit for the inverter's output and probably a current protection acts.

Connect a resistor between the inverter's output and pc power supply and try again. If it works you can bypass then the resistor with a relay or a triac.

Regards,
Florin
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