Study On Ingiting Arc Electromagnetic Noise Of Invert TIG Arc Welder

With the development of power electronic technology, more and more power electronic devices applies at industry ,for civil use and military domain, electromagnetic compatibility (EMC) and electromagnetic interference (EMI) question suffered the universal concern. The EMC design has become a vital process of any nowadays project and accordingly EMC will be needed in the design of welding equipments. Owing to its particularity that invert TIG arc welder work, therefore its EMC also looks more protruding, and the research that need to be gone deep into.It is the major reason to give rise to the electromagnetic noise(EMN) that the igniting arc when invert TIG arc welder is working, therefore this thesis firstly builds the model of high frequency igniting arc circuit and high voltage pulse start arc circuit, and then analyses the high frequency and high voltage pulse and understood his speciality of interfere. This thesis also builds the main circuit and control circuit and analyses the concrete circumstances to them of conduction interference of high frequency, and looks for out the interference law. This thesis introduced the measure and restrain of radiation of the high frequency EMI.Simulation and the experiment result indicates, high frequency and high voltage pulse contains a large number of high intensity harmonic wave. The more intense and higher is high frequency, more serious is interfere. So under the condition of satisfied use, EMI can be alleviated through reducing intensity and the frequency of high frequency, reasonably adjusts the parameter of circuit self and structure and take some measure such as screen, ground connection and isolation etc methods.