| to convert a 12v dc car adapter to support 19 volts dc - Click HERE for Original Thread |
| shadiedog87 |
| 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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| shadiedog87 |
| send me sum link a lil info sumthin plz |
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| Tweeker |
| Stick an off the shelf inverter in it and use the laptops regular charger? |
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| shadiedog87 |
| 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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| Tweeker |
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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| N-Channel |
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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