Battery backup
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Posted by CeeRox on August 6, 2008, 8:51 am
Please log in for more thread options Hi! I have a circuit board that has a processor which runs on 3V3. Input to the board is 12V so there is some power management as well. But, some times the 12V disapers during short periods. These periods are to long to solve with capacitors because the processor uses to much current. Im thinking of using a battery-pack, like NiMh-batteris. When the 12V dissapereres the current will come from the batteries. Does anyone have any ideas of circuits to solve the switching between these power sources..? /C | ||||||||||||||||
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Posted by Jan Panteltje on August 6, 2008, 9:04 am
Please log in for more thread options On a sunny day (Wed, 6 Aug 2008 05:51:19 -0700 (PDT)) it happened CeeRox 2 diodes. | ||||||||||||||||
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Posted by mpm on August 6, 2008, 4:42 pm
Please log in for more thread options
> Hi!
> > I have a circuit board that has a processor which runs on 3V3. Input > to the board is 12V so there is some power management as well. But, > some times the 12V disapers during short periods. These periods are to > long to solve with capacitors because the processor uses to much > current. > > Im thinking of using a battery-pack, like NiMh-batteris. When the 12V > dissapereres the current will come from the batteries. Does anyone > have any ideas of circuits to solve the switching between these power > sources..? > > /C Can you monitor the supply and put the microprocessor into sleep mode, (or idle), and then get away with capacitors alone? Seems like that might be a lot cheaper to do.... -mpm | ||||||||||||||||
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>
>I have a circuit board that has a processor which runs on 3V3. Input
>to the board is 12V so there is some power management as well. But,
>some times the 12V disapers during short periods. These periods are to
>long to solve with capacitors because the processor uses to much
>current.
>
>Im thinking of using a battery-pack, like NiMh-batteris. When the 12V
>dissapereres the current will come from the batteries. Does anyone
>have any ideas of circuits to solve the switching between these power
>sources..?
>
>/C