【作者】 刘建屏；

【导师】 路登平；

【作者基本信息】 天津大学 ， 材料加工工程， 2004， 硕士

【摘要】 电磁干扰（EMI）是电力电子学领域研究的热点问题之一。严重的电磁干扰不仅降低系统性能，还会对环境造成污染。世界各国对设备的电磁兼容性（EMC）十分重视，并制定了严格的标准，以减少电磁干扰对环境的影响。我国 2003 年8 月 1 日开始实施的 3C（China Compulsory Certification ）认证对 19 大类，132种产品的电磁兼容性进行了严格的规定，电焊机位列其中。因此，对焊机 EMC问题的研究迫在眉睫。 弧焊逆变机是强烈的 EMI 发射源，它不仅对周边设备和电网产生不良影响，而且就其自身而言，也会降低性能。本文首次把信号分析领域中的有力工具—小波包分析引入高频干扰信号分析，揭示了焊机传导型干扰信号的频谱特征。同时，通过建立干扰源和焊机的相应模型，并利用 Matlab 仿真软件，揭示了 ZX7—160弧焊逆变机传导型干扰的发生源及干扰的产生机理。 仿真和实测数据表明，功率开关管和快速二极管是弧焊逆变机中的主要干扰源；寄生电容和寄生电感是产生高频振荡的主要原因，此高频振荡信号通过控制电路作用，导致开关管产生误动作。 仿真结果与实验结果基本吻合，证明所建立的干扰源和系统模型能够反映焊机工作状态的真实情况。 本文为进一步研究弧焊逆变机的电磁兼容性奠定了理论基础。更多还原

【Abstract】 The Electromagnetic Interference (EMI) is one of the serious problems in thefield of power electronics. Heavy EMI does not only reduce the performance of thesystem itself, but also pollute the environment. Many countries of the world have paidgreat attention to the Electromagnetic Compatibility (EMC) of equipments, and havebuilt some strict criteria in order to reduce the influence on the environment. Theelectrical welding machine, as one of 132 products in 19 groups, has been rigidlyrestricted on EMC by 3C(China Compulsory Certification), which was published onAugust 1, 2003. As a result, the problem of the research on EMC of electrical weldingmachine must be faced up at present. The arc welding converter is the source of serious EMI. It does not only have abad effect on equipments around it and the power line, but also downgrade itself. Thispaper introduces the powerful tool in signal process—wavelet package into highfrequency interference signal analysis for the first time and discloses the spectrumcharacter of the conducted interference signals in electrical welding machine. As thesame time, by building interference source module and electrical welding machinemodule as well as making use of Matlab simulation software, this paper finds out theprinciples of conducted interference in ZX7—160 arc welding converter. Simulation and measurement data shows that the power switching tubes and fastdiodes are the dominating interference sources in the arc welding converter. Parasiticcapacitance and parasitic inductance are the main high frequency interference sourceswhich lead to the misactions of the switching tubes by control circuit. Simulation results agree well with the measurement data. This approves that themodules of interference sources and system can reappear the true state of arc weldingconverter. This paper establishes the theoretical base of other kinds of arc weldingconverters for further researching on the EMC .更多还原