I recently designed a capacitor discharge welder for my welding applications, and I come through a problem about separating grounds between AGND of the controller and (-) terminal of the big 1.3 farads 20 volts cap. after some hanging around on the web, several questions have been confusing me.
- placing a separation gap between grounds on PCB and connect them through a zero-ohm resistor.
- Connect the grounds as normal but in this situation, due to my lack of knowledge, in the discharging period, the capacitor might cause fluctuating the ground thus damaging the micro-controller.
Any help would be appreciated