Electrical Engineering - Plugin sense circuit

Author

Plugin sense circuit

markdmcclure@gmail.com

2007-09-25, 5:25 pm

I have 3 power jacks connected to a shared bus via a PCB. Each jack
provides 19volts/9.5 amps. On it I have a microprocessor I have
programmed. What I would like to do is have the micro sense which jack
has been plugged in.

Because of the heat and high amperage diodes don't seem like the best
choice, and I have limited space for relays. Anyone have any good
suggestions how I would go about doing this?

Mark

Palindrome

2007-09-25, 5:25 pm

markdmcclure@gmail.com wrote:
> I have 3 power jacks connected to a shared bus via a PCB. Each jack
> provides 19volts/9.5 amps. On it I have a microprocessor I have
> programmed. What I would like to do is have the micro sense which jack
> has been plugged in.
>
> Because of the heat and high amperage diodes don't seem like the best
> choice, and I have limited space for relays. Anyone have any good
> suggestions how I would go about doing this?
>

Hall effect devices on the power traces/wires?
Coils with reed relays in them?
Op amps sensing the voltage drop in the power traces/wires?
Fit microswitches to the power jacks to sense a plug?
Fit small magnets to the plugs and a reed relay/ Hall effect switch on
the case as sensor?
Use power jacks with an auxiliary contact?
Opto-couplers across holes in the power sockets that have their beams
broken by plugs?
etc..
You want more?

--
Sue

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