question about UPS Battery (12 volt), DC/DC converter and PC

[Jack Snodgrass]

I want to run a Mini-ITX PC Motherboard off of a 12 volt
UPS Battery ( for a robotic platform )

The motherboard is currently connected to a DC/DC converter
and runs off of a 12 volt, 4.5Amp power brick. The DC/DC converter
takes the 12volt DC in and produces the +-5, +-12 that the PC
motherboard expects.

If I just replace the 12 volt power brick with a 12 volt
UPS battery ( fully charged ) am I going to run into problems?

Any info would be appreciated.

jack

 

On Tue, 30 Dec 2003 18:54:12 GMT Jack Snodgrass <jack+ntlug@mylinuxguy.com> wrote:
|
| I want to run a Mini-ITX PC Motherboard off of a 12 volt
| UPS Battery ( for a robotic platform )
|
| The motherboard is currently connected to a DC/DC converter
| and runs off of a 12 volt, 4.5Amp power brick. The DC/DC converter
| takes the 12volt DC in and produces the +-5, +-12 that the PC
| motherboard expects.
|
| If I just replace the 12 volt power brick with a 12 volt
| UPS battery ( fully charged ) am I going to run into problems?

I would presume that as the 12 volt battery starts to lose its charge, you
get a voltage drop, and that will at least affect the +-12v output from the
DC/DC converter, depending on how it is designed (maybe it can keep the +-12
at 12v even when the input is 10v). You might want to find out how the BIOS
reads CPU voltages in the motherboard and add those tests in your robotic
software (imagine the robot stopping and going to look for an outlet to feed
on to recharge when it gets low).

--
-----------------------------------------------------------------------------
| Phil Howard KA9WGN | http://linuxhomepage.com/ http://ham.org/ |
| (first name) at ipal.net | http://phil.ipal.org/ http://ka9wgn.ham.org/ |
-----------------------------------------------------------------------------

 

[Jack Snodgrass]

On Tue, 30 Dec 2003 18:54:12 +0000, Jack Snodgrass wrote:

I want to run a Mini-ITX PC Motherboard off of a 12 volt
UPS Battery ( for a robotic platform )

The motherboard is currently connected to a DC/DC converter
and runs off of a 12 volt, 4.5Amp power brick. The DC/DC converter
takes the 12volt DC in and produces the +-5, +-12 that the PC
motherboard expects.

If I just replace the 12 volt power brick with a 12 volt
UPS battery ( fully charged ) am I going to run into problems?

Any info would be appreciated.

jack

my initial test failed... no smoke, but no output either.
I think that the putput from the UPS Battery was out of spec
with the DC-DC converter I was using. I need to do some
more research on cleaning up the incoming 12 volts.

jack

 

[Mark Fergerson]

Jack Snodgrass wrote:

On Tue, 30 Dec 2003 18:54:12 +0000, Jack Snodgrass wrote:


I want to run a Mini-ITX PC Motherboard off of a 12 volt
UPS Battery ( for a robotic platform )

The motherboard is currently connected to a DC/DC converter
and runs off of a 12 volt, 4.5Amp power brick. The DC/DC converter
takes the 12volt DC in and produces the +-5, +-12 that the PC
motherboard expects.

If I just replace the 12 volt power brick with a 12 volt
UPS battery ( fully charged ) am I going to run into problems?

Any info would be appreciated.

jack


my initial test failed... no smoke, but no output either.

Did you put the mobo back on the PS to make sure you
didn't fry it on the battery? Was the UPS battery _really_
at 12V, or the usual lead-acid 13.6V or so? If the mobo
still runs on the PS it may have just temporarily locked up
due to overvoltage. What's the Vin spec for the mobo?

I think that the putput from the UPS Battery was out of spec
------------------>^^^^^^
with the DC-DC converter I was using. I need to do some
more research on cleaning up the incoming 12 volts.

Is there a collection of electronic malapropisms?

Mark L. "Eye niver mispelt anyfink" Fergerson