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Thread: Trying To Understand Proper Power Supply

  1. #1
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    Trying To Understand Proper Power Supply

    Hey guys... I've been reading around and I'm just getting somewhat confused.

    I understand that DC-DC is better, however... my setup is a
    2.4ghz celeron laptop
    7inch lilliput touch screen

    Is it true that I NEED to use an inverter since I have a laptop and it already has a PSU?

    My main concern is that I want the laptop to turn on/off with the car key, the screen doesn't matter to me as much, and I thought that with an inverter I couldn't do this little trick... Plus inverters are inefficient, noisy, and hot.

  2. #2
    Variable Bitrate
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    No, just buy a car laptop power adapter (make sure it works with your brand/model). They're cheap and easy to find.

    However such adapters will not force your laptop to turn on/off.

  3. #3
    Maximum Bitrate psyrex's Avatar
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    There are DC-DC converters that simply do a 12v-19v (I'm assuming your laptop wants 19v -- check your AC power brick) and will give you the power you want. Shutdown/Startup is harder because there's no native way to let your laptop know that your car is running or not. There are various hacks on this site, including soldering wires to the power button and constructing a circuit to hit the switch on ignition.

  4. #4
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    Thanks for the response man. Where would I look into buying one of those? I looked on the store in this site and I didn't really see what I needed...

    Good brands? Good sites?

  5. #5
    Raw Wave Rob Withey's Avatar
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    Quote Originally Posted by ilovemyhonda View Post
    I looked on the store in this site and I didn't really see what I needed...
    Look harder...!
    http://store.mp3car.com/Carnetix_CNX..._p/pwr-010.htm
    http://store.mp3car.com/Carnetix_CNX..._p/pwr-026.htm
    Old Systems retired due to new car
    New system at design/prototype stage on BeagleBoard.

  6. #6
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    That first link looks like what I need, when I looked at it the first time I thought that it was part of building an actual computer, I didn't realize that I could plug my laptop right into it?

    http://store.mp3car.com/Carnetix_CNX..._p/pwr-010.htm

    So I would just plug my screen and laptop into this and plug this into an acc wire? Or where would this plug into?

  7. #7
    Neither darque nor pervert DarquePervert's Avatar
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    You need constant 12v, switched 12v and ground.
    Have you looked in the FAQ yet?
    How about the Wiki?



    Under normal circumstances, a signature would go here.

  8. #8
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    I just want to clarify that a laptop will work with that power supply, the one that I linked to above. If so, I will buy that and then figure out how to make it work...

  9. #9
    Maximum Bitrate psyrex's Avatar
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    You first have to clarify what laptop you actually have. I made a guess at 19 volts because that's fairly common, but there's all kinds out there that require anywhere between 16 to 21 VDC input.

  10. #10
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    Okay, Gotcha, that particular psu goes from 18 to 20. And I do not yet have the laptop (getting it from a family member soon) but I'm trying to plan ahead. So I'm going to assume, that my laptop falls between 18 and 20. In which case, that would be the proper power supply.

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