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Converting AC-DC to DC-DC

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  • Converting AC-DC to DC-DC

    In normal computer power supplies (AC-DC) surely there is just a down step transformer to say 12v then regulates the 12v then converts the 12v to all the other voltages! Could it be possible to connect the 12v from car (unregulated) to where the step down transformer output was?

    Dean

  • #2
    It wouldn't be entirely truthful to just answer 'no' to that, but at the same time it's not quite that simple. Atx psus actually boost the 110v ac up much higher before converting it down to the regulated dc rails. It is possible (and actually NOT unheard of around here) to replace the ac-ac stepup half of the psu to a dc-ac stepup, which allows a 12v input. It's not terribly common, but a search of the board ought to turn it up.

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    • #3
      I'm feeling bored and nice right now, so open the hanger 'cause here comes the little airplane.

      http://www.mp3car.com/vbulletin/sear...archid=1375559

      http://www.mp3car.com/vbulletin/showthread.php?t=51115

      http://www.mp3car.com/vbulletin/showthread.php?t=51459

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      • #4
        Originally posted by deanwarez
        In normal computer power supplies (AC-DC) surely there is just a down step transformer
        Nope, that's not how it works. The AC is rectified first and then switched through a transformer by FETs or similar. The FET switching is controlled (PWM stylee) to do the regulation. Search for Presslab's forward converter for how to convert one to DC-DC.
        Old Systems retired due to new car
        New system at design/prototype stage on BeagleBoard.

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