Subject: Re: unreliable DC 12v to regulated DC 12v
References: <3E049EB0.84741AA5@mfi.net> <3E04D69A.B99DDC1E@juno.com>
Date: 21 Dec 2002 17:51:13 -0600
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hehehe, the 1 farad cap is a car audio cap, only 20v, so not that big :)
Ok, for starters... its not a notebook, its a Via Eden system
Secondly, I am currently running it with a notebook powersupply and a 12v
to 240v inverter (Australia).
But this requires turning on and off, otherwise, even if the computer is
turned off, the inverter by itself will still flatten the battery.
now... the system doesn't draw 60 watts, it only draws about 42, its a 60
The system I built has already been 100% integrate into my car, in the
way that it turns on when I unlock the doors, and turns off when I lock
them, and theres overides for this..
If you saw the setup, u wouldn;t even realise its a computer... until I
alctually shown you the boot.... just a very expensive head unit.. the
only problem I have, is I need continual power to the computer for the
The inverter also shuts off during cranking because supply voltage is too
Now, on the transients, I am aware of these spikes, my drop during
cranking is not that low, if it was I'd be looking at another starter
motor, as that is too low.
with the engine starting.. i need 12v regulated, i know this, but thats
where a second 12v sla should solve this, if I put a cap in line between
switch and sla battery.
the reverse voltage, never
the 24v cranking, never, you should be 12v jump starting
> Sounds like you built a "nice" power supply
> without considering
> what it needs to do. Do a google search for
> AN9312.pdf for some
> enlightning but scary information.
> Building a supply that regulates whether the input
> is above or below
> the output without a transformer is doable, but
> rarely worth the
> The best solution is to use a 120V computer and a
> 12V to 120VAC converter.
> You won't like the thought of this initially, but
> you'll really appreciate
> the flexibility when you want to add/modify the
> system in the future...
> and you will modify it.
> You can get more efficient with one supply. All
> you have to do is duplicate
> all the functionality of a PC supply, but switch
> the primary from 300ish VDC
> to 12VDC.
> Unless you need to run the thing for hours and
> hours with the engine off, you'll
> never miss the efficiency lost by a 12V to 120VAC
> converter. You'd gain more
> by starting with a laptop that doesn't draw 60W.
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