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True Power - Digital Watt Meter

Hi Guys,

I'm looking for some direction to build a watt meter that I can
interface to a uP. I would like to be able calculate the power factor
of house hold appliances and therefore need the true power reading. My
thoughts so far is to use some king of a shunt but there may be other
ways. Any suggestions would be appreciated.

thanks
 
Hi Guys,

I'm looking for some direction to build a watt meter that I can
interface to a uP.  I would like to be able calculate the power factor
of house hold appliances and therefore need the true power reading. My
thoughts so far is to use some king of a shunt but there may be other
ways. Any suggestions would be appreciated.

Analog Devices do a number of circuits for doing this kind of job in a
variety of situations. Here is an application note for one of their
parts.

http://www.analog.com/UploadedFiles/Application_Notes/5112981462932AN679_a.pdf

I hope this helps
 
M

Martin Griffith

Jan 1, 1970
0
On Fri, 8 Feb 2008 02:49:52 -0800 (PST), in sci.electronics.design
Hi Guys,

I'm looking for some direction to build a watt meter that I can
interface to a uP. I would like to be able calculate the power factor
of house hold appliances and therefore need the true power reading. My
thoughts so far is to use some king of a shunt but there may be other
ways. Any suggestions would be appreciated.

thanks

http://focus.ti.com/mcu/docs/mcuorphan.tsp?contentId=31810 has some
stuff, eg
http://www.ti.com/lit/slaa075


martin
 
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