Design of anti-interference for control system of computer controlled pulsed MIG welding machine

The antiinterference technique for a pulsed MIG welding controlled by microcomputer is developed. The possible origins of abnormal operation of welding are analyzed. On the basis of analysis some measures are taken in the circuit design, PCB making, and programming. The hardwares include shield, decoupling, filter, isolation, and grounding. Software include watchdog, redundant instruction, and digital filtering. Testing results show that these measures can solve the problem of interference which influences the control system.