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Old 31st October 2007, 04:45 AM   #1
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Default to convert a 12v dc car adapter to support 19 volts dc

i wanna be able to charge my laptop that requires 19v dc 3.42A and the cigar lighter in the car is only 12v dc any help
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Old 31st October 2007, 06:35 AM   #2
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send me sum link a lil info sumthin plz
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Old 31st October 2007, 08:32 AM   #3
Tweeker is offline Tweeker  United States
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Stick an off the shelf inverter in it and use the laptops regular charger?
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Old 31st October 2007, 09:31 AM   #4
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Quote:
Originally posted by Tweeker
Stick an off the shelf inverter in it and use the laptops regular charger?

where would i get somthing like that like radio shack?
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Old 31st October 2007, 11:23 AM   #5
m-tech is offline m-tech  Serbia
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You need something like this:

12v=19v 4,7A dcdc
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Old 31st October 2007, 01:40 PM   #6
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Truck stops, auto supply houses, Target etc etc has inverters for automotive use. Radio Shack might too.

12VDC-120VAC-laptop adapter 19VDC.
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Old 31st October 2007, 07:27 PM   #7
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Quote:
Originally posted by m-tech
You need something like this:

12v=19v 4,7A dcdc

Shadiedog,

You might want to look over the thread m-tech suggests, it is chock-full of good info in boost converters. I have made many of these 12-19V boost converters for just the same thing you need: laptop power from the cigar lighter. Almost everyone was made with National Semiconductor's LM2587-ADJ SimpleSwitcher IC. This is a boost IC that, in its simplest form, requires an input cap, output cap, diode, inductor, resistor divider, and a feedback compensation network, usually a 2.2kW or 3.3kW resistor in series with 0.33mF or 0.68mF cap. That's all- just a few components, and you have a very robust DC-DC boost converter.

Go to National's website and do a search on "SimpleSwitcher", and see the multitude of choices of chips you have.

Not to dog on tweeker, but this is a DIY forum, and just buying off-the-shelf kind of defeats the purpose.....

Look at post #35 of the thread m-tech posted. This is where things get interesting.

Hope this helps, and let us know what path you want to take- we're here to help.

Cheers,

Steve
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