Current Sensors How to select a good one or roll your own.

marcos said:
Great to hear. 6 days ago I gently reminded Isabellenhuete about the shunt samples I asked for and after some checking they told me they will ship around christmas (ship to argentina). I'm not building pcbs until have samples in my hand.

The samples I asked for are 2000A shunts that are not actually available for ordering because they are sold with the electronics built in. The little board I made is for a commercial, ready to order shunt (that I think I'm not getting a sample of).
I'll get you in contact with the factory to get you some BAS-Z-R000035 shunts.
Click to expand...

OK cool. Thanks for all of that. If I need I can run 2 in parallel.
The first few tests will be dyno time with this new inverter.
that will be much more stress on the system then in a drag application.
I checked out there company last night and the video is pretty awesome even though I don't speak German it gets you pumped up.
 
Damn no word on any shunts. I have just started searching but I am not sure what I need. I can work the math but what type of design for a shunt resistor is a good one?
 
Do you have a size constraint? I've seen plenty of them for industrial use, but they're huge. It may be possible to harvest the resistance elements from some (Manganin?) and repackage to fit the space.

Most of the higher rated ones use multiple parallel resistance elements, either flat or round.

600A shunt.jpg

400A shunt 1.jpg
 
marcos said:
The board is here
https://github.com/paltatech/current_sensor

This is the bom generated by kicad
https://github.com/paltatech/current_sensor/blob/master/design/current_sensor.xlsx?raw=true

I didn't bother to fill the passives part#, I copied the filter from the other forum and those values or even the opamp could change.

Something worth asking is how to solder the shunt to the pcb. If 170°C is the max temp, how do you do a 250°C reflow?
Click to expand...

Whats J3 for? Nightly builds messed up the SCH on me :(

:Edit it looks like it's for powering the unit.
 
J3 connector has 5v power input, Signal output (0A=2.5v), and GND.

top level.png

file.php


I'm not mentally prepared yet to upgrade to the latest kicad nighties because of the new library remapping. Will have to do sooner than later, but I know it will be painful...
 
marcos said:
J3 connector has 5v power input, Signal output (0A=2.5v), and GND.

top level.png

file.php
Click to expand...
[strike]
So... I think J3 is on the wrong board...[/strike]
Sorry Marcos
My bad I was thinking the board with the screw holes was to be bolted to a shunt.

Its the other way around. Now I get it.
Thanks.

-Arlin
 
Just found this thread...

Sendyne makes a good current sensor IC with CAN interface that is designed to work with their own design 18uohm shunt. It's the lowest value shunt I've found.

http://www.sendyne.com/Products/SFP200%20Current%20and%20High%20Voltage%20Measurement%20Module%20with%20CAN%20communication.html
 
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