Stability Of Single Chip Microcomputer Control System In Arc Welding Inverter Power Source

TIG welding is a high-quality welding method. It is applied widely for its stablewelding process, easily control and high quality .TIG welding power supply isdeveloped quickly with the extending of TIG welding. But during the development,the electromagnetic disturbance of high frequency arc-ignition and arc- stabilizedbecome serious problems. TIG welding usually applies non-touched arc-ignition methods. Among thesemethods, high voltage ignition and high frequency ignition are primary methods. Forhigher succeeded ignition, easy manufacture, cheap cost, high-frequency-igniter iswidely used in TIG welding inverter. Because high frequency and high voltage,necessary measures should be taken in order to enable IGBT and single chipmicrocomputer system normally work. The high-frequency igniter of TIG welding equipment is a severe source ofinterference to the single-chip microcomputer system and electronic componentsintegrated into the equipment, so the study on anti-interference of microcomputercontrol in arc welding inverter power source is sticking point. This paper explores theprinciple of high-frequency-igniter; analyze coupling paths from space, channel,power source and so on considered the high frequency interference to microcomputercontrol system. Several practicable anti-interference measures are developed withrespect to both of hardware and software. Experiment results show that thesemeasures can effectively inhibit destructive interference of high-frequency igniter insingle-chip microcomputer control system and electronic components integrated intothe equipment ensuring the stability and reliability of microcomputer real-timecontrol. This work is financially supported by Beijing Science and Technology New StarProject (H020821230120). - II -ABSTRACT...