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Help with 12V DC backup solution

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morky

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Hi,
I need to find a way to provide a backup power supply for some equipment installed in a car.

It is usually drawing around 2-3Amps from the car's 12V supply, but I need to have some sort of temporary backup if the car's supply is interrupted momentarily.

I can think of two possible solutions:

1. Supercapacitors which will provide a few seconds of backup.
2. A small battery kept charged by the 12v supply which will cut in when the 12V supply is lost.

One stipulation is that I need to keep this '12V UPS' as small and light as possible. Hence, I don't want to use lead-acid battery and trickle charger, but a Lithium battery would be suitable.

The second approach would probably be better because I could easily use a large battery if I needed several minutes of backup, but with the recent developments in supercaps I'm wondering if that's viable.

Does anyone have any suggestions/recommendations or know of any 'off the shelf' solutions like this?
 

eem2am

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most supercaps are just 3.3v or something.

i'd go for yor lithium idea..

eg ti.com do loads of battery charger chips
 

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