power supply switch

Jan 16, 2007 3 Replies
F

Hi,



I've got a little problem, I'm looking for a special part for my microcontroller project, it is supposed to have main power supply 14V input and battery back-up power supply input and one output for chosen power supply and optionally a signal that can be used as an interrupt signal in the microprocessor informing about the power supply change to back-up. This part should change the power supply to back-up if standard power supply was not connected/unplugged/whatever and send the INT signal. Dunno English names for such parts, but I heard that they can be actually aquired from various manufacturers. I'd be really thankful if someone could guide me/ maybe give a link or tell me how do you call that stuff so I can look myself.



Thanks, Simon



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L

Not sure I've heard or even envision such a switch. Easiest solution I can think of is doing a diode 'ORing' of the two power sources and then tapping the main power before it's diode and reading that as a analog or digital input (with proper clamping and/or resistor divider. Then you software could read that input, and if off, it could assume that only the battery pack is powering the unit.

Larry

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J

formatting link
shows some Maxim parts that might work for you if they exist. Eg see p. 4, MAX6819, and p. 5, MAX6870. The article should help with terminology, regardless of whether those particular parts are available.

-jiw

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F

Hi, Thanks a lot that link really helped I found a lot of information thanks to that link and learnt much more interesting things, thanks again. Simon

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