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Extending current shunt amplifier voltage

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Last seen: 4 hours 45 min ago
Joined: 2017-09-22 01:27
Posts: 574
Extending current shunt amplifier voltage

I am currently using all 100v rated components apart from the current shunt amplifiers which only go to 80v. There are no >80v shunt amplifiers avaliable so I need to put something around it to 'float' it at the common mode voltage.

I think this is the most useful app note on the issue

The simplest method is to just add a resistor divider with precision resistors. So I might try that out and see just how bad it is.


Last seen: 1 week 6 days ago
Joined: 2017-09-05 13:47
Posts: 57

Only problem i can think of is that those shunt amplifiers are designed for low impedance signal source.


Roger Wolff
Last seen: 1 year 5 months ago
VESC Original
Joined: 2017-05-24 12:27
Posts: 202

There are optoisolated analog (operational) amplfiers. Those are specifically designed to amplify and pass on phase currents. Also there are hall sensor devices like the ACS711 (low voltage only) and bigger like the ACS758.