车载电子设备的电磁兼容研究

【作者】 刘骞；

【导师】 陈特放；

【作者基本信息】 中南大学 ， 交通信息工程及控制， 2004， 硕士

【摘要】 本文以电力机车用110V开关电源的电磁兼容性设计为例，研究了车载电子设备的电磁兼容性原则。内容涉及到该设备电磁兼容预测性模型的建立，提取了减小电磁干扰的原则，用于指导其设计，成功通过了铁标TB／T3021-2001中所规定的电磁兼容试验，该产品电磁兼容性设计的成功为车载电子设备的电磁兼容性设计提供了借鉴。 为了使得预测的电磁干扰水平和实际接近，首先对大功率开关器件进行了高频建模，在分析干扰耦合途径的基础上，对无源元件的寄生参数进行了提取，同时提取了主回路器件连接导线的寄生参数，建立了电磁兼容的预测模型。在选定了某种元件布局的基础上，进行了软件模拟仿真，修改元器件布局方式，得到不同的干扰水平，鉴于软件仿真的直观性、方便性及精确建模基础上，结果可信度高。对于仿真中提取的原则，用于指导实践，减小了电磁兼容性设计的盲目性，降低了成本和开发周期。在减小辐射干扰水平方面，就理论上进行了探讨。由于电磁兼容学科本身的复杂性，以及依据装置工况不同干扰水平不同的特点，实际设计中采取了滤波和屏蔽措施。 本文为车载电子设备的电磁兼容设计提供了借鉴的思路。通过预测性模型的建立可以减小设计中的盲目性和局限性。更多还原

【Abstract】 This dissertation focuses on the rules of EMC for the electronic equipments used on rail vehicle, based on the EMC design of 110V SMPS for electric locomotive. It includes works for: establishing the forecasting EMC model for 110V SMPS, deriving the rules for guiding the EMC design of the equipment which has passed the EMC test guided by TB/T3021-2001. The rules of successful EMC design in the equipment can be used as reference for other electronic equipments used on rail vehicle.To make the forecasting EMI level match the level in fact, we establish the high frequency models of power semiconductors to improve the accuracy of models first. Then, we extract the parasitic parameters of the passive devices and the connected leads based on the analysis of coupling loops to establish the forecasting EMI model. On selecting the layout of components, simulating for the EMI is made. While the layout is changed, we can get different EMI levels. From which, guide can be extracted to optimize the design which can avoid the blindness and limitation of trade-off method on the design so cost can be lowered and cycle can be shortened. Research on depressing the radiation EMI level is only limited in theory in this dissertation. In fact, shield and filter measures are taken because of the complexity of EMC problems as well as different EMI levels of the equipment under different working conditions.The dissertation provides a reasonable method of reference on the EMC design of electric equipments on rail vehicle. Blindness and limitation in EMC design may be lowered by establishing the forecasting EMC model.更多还原