i am struggling to get this working before i order the parts to do actual test. Forgive me with the design of the circuit but how accurate would this circuit be ?
In the attached ‘Weld cable 1’ is section of the weld cable that would be used for spot welding. U3 acts as differential amp to measure the voltage drop at ‘Weld cable 1’ U1 and U2 are full wave voltage rectifiers as mentioned here by Linear Technology.
The idea here is to measure the amps put into a nickel strip during spot welding 18650 cells. Since the current is very HIGH 2000 - 3000A other alternatives like CT and products like Allegro current sensors would not help.
In the attached change the .txt of LTSpice to .asc
Precision Rect xfmr.txt (2.79 KB)