<div dir="ltr">Side question... and suggestions for test loads for that much current?</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Sat, Jun 14, 2014 at 12:02 PM, Adam Haile <span dir="ltr"><<a href="mailto:email@adamhaile.net" target="_blank">email@adamhaile.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Very nice :) Will check those out. I assume those that the board traces for the power pass-through would still have to be massive though?<div>
<br></div><div>According to the calculator in KiCad, 2.75 mil trace (OSH Park standard) for 100A and a 20C temp rise would have to be 56mm wide!</div>
<div>And am I reading it right that these don't need a heat sink? I'm assuming because it's not a typical ultra low resistance shunt and has effectively no resistance, therefore little to no wattage absorbed?</div>
</div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><br><div class="gmail_quote">On Sat, Jun 14, 2014 at 11:50 AM, Fred Ebeling <span dir="ltr"><<a href="mailto:FEbeling@ecpdesigns.com" target="_blank">FEbeling@ecpdesigns.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">
<div dir="ltr">
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<div>Hi</div>
<div> </div>
<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>
<div> </div>
<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" target="_blank">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 style="FONT:10pt tahoma">
<div><font size="3" face="Calibri"></font> </div>
<div><font size="3" face="Calibri"></font> </div>
<div><font size="3" face="Calibri">Fred Ebeling</font></div>
<div><font size="3" face="Calibri">ECP Designs</font></div>
<div> </div>
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<div><font size="3" face="Calibri"></font> </div>
<div style="BACKGROUND:#f5f5f5">
<div><b>From:</b> <a title="email@adamhaile.net" href="mailto:email@adamhaile.net" target="_blank">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" target="_blank">triembed@triembed.org</a> </div>
<div><b>Subject:</b> [TriEmbed] High Current Sensing</div></div></div>
<div> </div></div>
<div style="FONT-SIZE:small;TEXT-DECORATION:none;FONT-FAMILY:"Calibri";FONT-WEIGHT:normal;COLOR:#000000;FONT-STYLE:normal;DISPLAY:inline"><div><div>
<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" target="_blank">http://www.ebay.com/itm/370888481354</a>)
and building it out with a few more features.
<div> </div>
<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" target="_blank">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>
</div></div><p>
</p><hr><div>
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