Car Electronic Equipment, Electromagnetic Compatibility

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.