CA does current sensing through an external shunt for me (High power version)
I need current range up to 500 or 600A, the shunts are horribly expensive and not available locally. BUT I have loads of linear hall sensors and thought I could make a circuit to monitor the current using this, the 5v supply a MAX232 to give me the inverted power that i need to onvert 0-Vcc to -Vcc - Vcc with 0 for 0 urrent (Hall sensor gives Vcc/2 as zer), but again, a big PITA to calibrate accuratly enought for coloumb counting etc.
So I wanted to know if anyone has done this, if there is any reason to DEFINATLY _not_ do this. Then I guess I need to make the output 'look' like a 50mV shunt.
THey say shunt input must be +-200mV, and it would be good to use the full range.
Also if anyone has done this it may save me some time trying to remember all my op-amp theory and making the level shifting (with trimpot) and amplifying circuit.
There must be a MAX232 on a pcb here somewhere 8)
One of my bigger problems is I dont have a 50A or 100A load to put on the wires to calibrate. Have a good fluke current clamp... but a load... hmmm...