I have a capacitor bank with 4 units in parallel and I'm trying to figure out the worst case scenario of current sharing at turn initial turn on. If 3 of the capacitors have the maximum ESR and one is say half the maximum ESR, how do I calculate the maximum current of the low ESR unit?
Electronic – Calculating current through multiple capacitors in parallel
capacitor
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Best Answer
For any voltage step, the capacitance doesn't matter and the instantaneous impedance is just the resistance, or ESR.
In any case, when you're applying a fixed voltage to multiple things in parallel, you calculate the current draw of each thing independently, then add them for the total current.