传导性电磁兼容关键技术研究

【作者】 尹海平；

【导师】 赵阳；

【作者基本信息】 南京师范大学 ， 电工理论与新技术， 2008， 硕士

【摘要】 随着高速功率开关器件的普遍使用,大量的电力电子装置产生传导性电磁干扰问题不断出现,已成为电力电子技术进步的一个重要约束。因此对电力电子装置的传导性电磁干扰诊断技术以及其传导性干扰的产生机理研究具有十分重要的意义。本课题基于国内外传导性电磁干扰噪声的研究现状,对比分析了基于硬件和基于软件的多种传导噪声分离网络,提出了传导性噪声诊断技术,对一商用开关电源进行传导电磁干扰测量,测试结果表明了该技术可对传导电磁干扰噪声进行有效诊断。在此基础上,开发了传导性电磁干扰智能诊断系统,该系统通过对噪声的提取、处理、诊断、分析,可得出有效的噪声抑制措施,为当前电子产品的设计提供了有效的参考,以满足电磁兼容国际标准。本课题进一步研究了传导性干扰噪声源建模技术,阐述了噪声源建模基本原理,分析比较了几种建模方法的利弊,并利用电流探头法对已知阻抗进行了验证。更进一步,对开关电源的传导电磁干扰产生机理进行较为深入的研究,建立了开关电源传导电磁干扰模型,通过传导电磁干扰噪声机理实验,分析了驱动电路、开关管上升时间以及散热器与漏极电容Cm对噪声的影响,并利用Pspice软件进行传导性干扰的仿真研究,验证了各参数变化对仿真结果的影响。最后,提出一些有效的开关电源传导电磁干扰抑制措施:缓冲电路设计、平衡电感抑制共模干扰,仿真结果验证了这些方法的有效性。更多还原

【Abstract】 With widely use of high-speed power switching devices, conducted EMI problems generated by power electronic equipments become more serious and have been a main restriction of progress of power electronic technology. So, researches of diagnosis technology of conducted EMI noise generated by power electronic equipments and mechanism of conducted EMI become more significant.Focused on reviewing the research of conducted EMI noise at home and abroad, The dissertation compares different kinds of discrimination networks based on hardware and software and proposes diagnosis technology of conducted EMI noise, the testing results of a commercial SMPS verify the effective diagnosis of this technology. Based on this, intellectual diagnosis system is developed, through noise extraction、disposal、diagnosis、analysis, effective noise suppression methods could be gotten, providing reference for electronic production design in order to satisfy international EMC standards.Research is also done on conducted EMI noise modeling technology. First, basic principle of conducted EMI noise modeling is elaborated, then several modeling methods are compared and experimental results of known resistances are given. Furthermore, some research on generation mechanism of conducted EMI of BOOST converter is done, conducted EMI models of BOOST converter are built, through experiments, influence of driving circuits、rising time、Cm between radiator and drain on EMI noise is analyzed. Simulation of conducted EMI is also done using Pspice software, influence of parameter variations on simulation results is verified. At last, some effective suppression methods of conducted EMI of SMPS are proposed: snubber circuit design and suppression of common-mode noise with balanced inductance. Simulation results verify the validity of these methods.更多还原