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<DIV>Hi</DIV>
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<DIV>I would recommend one of the allegromicro products. They have
evaluation boards and I actually</DIV>
<DIV>use one to monitor my power supplies under development. Its big
advantage is its isolated and</DIV>
<DIV>you only have to pass the power thru the device. No voltage drop, no
power loss.</DIV>
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<DIV><A
title=http://www.allegromicro.com/en/Products/Current-Sensor-ICs/Fifty-To-Two-Hundred-Amp-Integrated-Conductor-Sensor-ICs.aspx
href="http://www.allegromicro.com/en/Products/Current-Sensor-ICs/Fifty-To-Two-Hundred-Amp-Integrated-Conductor-Sensor-ICs.aspx">http://www.allegromicro.com/en/Products/Current-Sensor-ICs/Fifty-To-Two-Hundred-Amp-Integrated-Conductor-Sensor-ICs.aspx</A></DIV>
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<DIV><FONT size=3 face=Calibri>Fred Ebeling</FONT></DIV>
<DIV><FONT size=3 face=Calibri>ECP Designs</FONT></DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=email@adamhaile.net
href="mailto:email@adamhaile.net">Adam Haile</A> </DIV>
<DIV><B>Sent:</B> Saturday, June 14, 2014 11:35 AM</DIV>
<DIV><B>To:</B> <A title=triembed@triembed.org
href="mailto:triembed@triembed.org">triembed@triembed.org</A> </DIV>
<DIV><B>Subject:</B> [TriEmbed] High Current Sensing</DIV></DIV></DIV>
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<DIV dir=ltr>As those that saw my projects at the Maker Faire know, I work with
a lot of high current LED projects. So I'm always looking for higher current
supplies and my variable bench supply definitely doesn't cut it so I generally
use supplies like the 5V/40A supply I used for my 24x24 matrix. But that is even
a too little for some of the projects I have planned. I'm thinking about getting
a 500 - 700W (@5V) supply (something like this: <A
href="http://www.ebay.com/itm/370888481354">http://www.ebay.com/itm/370888481354</A>)
and building it out with a few more features.
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<DIV>Mainly, I want to add built in current sensing that would be displayed on
an LCD screen (likely all Arduino controlled). The supply itself would be
unmodified - I'm not crazy. I would just add all that between the supply output
and connectors on the outside of an enclosure I would build.</DIV>
<DIV> </DIV>
<DIV>So, my main question is if anyone has any advice for how I could go about
sensing this much current? I'm thinking about using something like the TI INA219
(<A
href="http://www.ti.com/product/ina219">http://www.ti.com/product/ina219</A>)
which, with the right shunt, should be able to handle it and would have a nice
I2C interface. I'd also like to have 2 - 4 separate outputs, each with their own
separate sensor... so each would need to handle up to 100A or so.</DIV>
<DIV> </DIV>
<DIV>I realize that running the current through any PCB trace to the shunt would
probably require insanely wide traces, so is there a good, high precision shunt
that would work off PCB?</DIV>
<DIV> </DIV>
<DIV>Basically, I don't know what I don't know, so I'd love any direction that
could be given.</DIV></DIV>
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