Hi,
We have a small PC/104 device that performs some input logging. The problem is we don't have any UPS system attached to it. Does anyone know of any inexpensive (around $100) UPS systems for PC/104 ? We only need enough power to perform a proper shutdown.
Many thanks,
Wim
Does your PC104 card have any power supply on it at all? If not you should perhaps consider making your own UPS system. A DC-DC converter (or two) delivering the PSU voltages the PC104 card requires, a battery pack that has enough capacity to keep your system going for as long as you need it to and a battery float charger. You need to ensure that, when the mains supply fails, the charger is not responsible for any of the discharge.
-- ******************************************************************** Paul E. Bennett .................... Forth based HIDECS Consultancy ..... Mob: +44 (0)7811-639972 Tel: +44 (0)1235-811095 Going Forth Safely ..... EBA. www.electric-boat-association.org.uk.. ********************************************************************
I'm using a standard 230VAC-to-5VDC power supply that I hook up to the PC104 CPU board. Basically, what you're suggesting is putting a standard battery (for example a
12V) in between and thus using a 230VAC-to-5VDC, then the battery, then a 12VDC-to-5VDC converter ?Wim
Almost right. Use a 230V to 12V PSU/Charger (to float a 12V battery) then the 12V DC to 5V DC converter which will power your board. I know it seems a bit strange but there is a huge loss of efficiency using a UPS system that down-converts the 230V to a DC battery voltage then convert the DC battery voltage to 230V AC. Your average laptop does things the way I suggest. Yes, you will need to pay a little more attention to the PSU/Charger item so that the battery is properly looked after. The DC DC converters for after the battery are fairly common place these days.
-- ******************************************************************** Paul E. Bennett .................... Forth based HIDECS Consultancy ..... Mob: +44 (0)7811-639972 Tel: +44 (0)1235-811095 Going Forth Safely ..... EBA. www.electric-boat-association.org.uk.. ********************************************************************
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