[TriEmbed] High Current Sensing

Adam Haile email at adamhaile.net
Sat Jun 14 11:02:04 CDT 2014

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?

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!
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?

On Sat, Jun 14, 2014 at 11:50 AM, Fred Ebeling <FEbeling at ecpdesigns.com>

>   Hi
> I would recommend one of the allegromicro products.  They have evaluation
> boards and I actually
> use one to monitor my power supplies under development.  Its big advantage
> is its isolated and
> you only have to pass the power thru the device.  No voltage drop, no
> power loss.
> http://www.allegromicro.com/en/Products/Current-Sensor-ICs/Fifty-To-Two-Hundred-Amp-Integrated-Conductor-Sensor-ICs.aspx
> Fred Ebeling
> ECP Designs
>  *From:* Adam Haile <email at adamhaile.net>
> *Sent:* Saturday, June 14, 2014 11:35 AM
> *To:* triembed at triembed.org
> *Subject:* [TriEmbed] High Current Sensing
>  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:
> http://www.ebay.com/itm/370888481354) and building it out with a few more
> features.
> 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.
> 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 (http://www.ti.com/product/ina219) 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.
> 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?
> Basically, I don't know what I don't know, so I'd love any direction that
> could be given.
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