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Date: Tue, 14 Jan 2003 16:12:43 -0500
From: Dan Barlow
User-Agent: Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.1) Gecko/20020826
X-Accept-Language: en-us, en
Subject: Re: Car Battery Supply
Organization: Heller Information Services
Sean Burns wrote:
> Hi All,
> Has anyone got a good example schematic of how to power a digital circuit
> from +12V car power supply?
> I am of the understanding that the supply is quite crap - what voltage can
> it drop to and what kind of artefacts can be seen on the supply? How do I
> protect against these artefacts?
Just a quick response, since I don't have any really helpful links.
You can have 1000V spikes in either direction, some nasty brownouts
(during starting etc.) and lots of RF noise.
Most people go to a switch mode power supply that steps the ~= 13.5V
up to a couple hundred volts DC, then a standard switching front end
for the computer voltages. At this point it's much easier to go buy a
300W inverter from Costco and run a standard ATX power supply on it.
My housemate has attempted to order car battery ATX converters before,
but has been very disappointed in the results... one supply couldn't
even give 25% of its rated current!
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