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'[EE] detecting for AC current draw'
2006\05\09@132645 by alan smith

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This is a busy week for....what/how games I suppose....
 
 
 Want to detect not that a device is plugged into a socket...but look to see if its turned on...ie.....is the device drawing any current, thus its running.
 
 Initial thoughts.....hall sensor that drives a bridge and then look for a DC threshold value.  (hall sensors used for AC current detect will mimic the AC waveform and increase the amplitude as more current passes thru the field while also provide isolation).

               
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2006\05\09@171601 by Dwayne Reid

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At 11:26 AM 5/9/2006, alan smith wrote:
>This is a busy week for....what/how games I suppose....
>
>
>   Want to detect not that a device is plugged into a socket...but
> look to see if its turned on...ie.....is the device drawing any
> current, thus its running.
>
>   Initial thoughts.....hall sensor that drives a bridge and then
> look for a DC threshold value.  (hall sensors used for AC current
> detect will mimic the AC waveform and increase the amplitude as
> more current passes thru the field while also provide isolation).

What kind of volume do you anticipate?

The toroid coil used in standard GFCI wall outlets will do what you
want - they are sensitive (maybe even too sensitive) and saturate
easily so as to not damage your detector circuit.

I know these can be had very cheaply *if* you are purchasing thousands.

dwayne

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Dwayne Reid   <spam_OUTdwaynerTakeThisOuTspamplanet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
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2006\05\10@030145 by YAP

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On 5/9/06, Dwayne Reid <.....dwaynerKILLspamspam@spam@planet.eon.net> wrote:
>
> At 11:26 AM 5/9/2006, alan smith wrote:
> >This is a busy week for....what/how games I suppose....
> >
> >
> >   Want to detect not that a device is plugged into a socket...but
> > look to see if its turned on...ie.....is the device drawing any
> > current, thus its running.
> >
> >   Initial thoughts.....hall sensor that drives a bridge and then
> > look for a DC threshold value.  (hall sensors used for AC current
> > detect will mimic the AC waveform and increase the amplitude as
> > more current passes thru the field while also provide isolation).




I do this in some solutions and use just an optocoupler and a 555. I set up
the 555 as a missing pulse detector and trigger it with the output frm the
opamp. This way I have an output on the 555 that is high as long as long as
a device is turned on and goes to zero when its gone.

I have a variant of it in the HULK project (
http://www.vscp.org/wiki/doku.php?id=the_hulk_ii_-_the_hulk_ii) but where
the missing pulse detector is wrong.

Regards
/Ake

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