Application Of Equivalent Cable Bundle Method In Cable Electromagnetic Compatibility

With the rapid development of modern electronic technique,the number of electronic devices in the electronic systems is increasing exponentially.As links between these devices and systems,cables carry signals and transfers electronic energy as well as harassment signals and the number of them grows even faster.In order to solve the electromagnetic compatibility issues of the cables of electronic information equipments,scientists have thought a lot of ways to solve such problems.Because of the huge increasement of the number of cables there are higher requirements of improvement for computing speed of computer hardware.The Equivalent Cable Bundle Method is a method based on physical electromagnetic principle.By using common mode current analysis method,cables in a cable bundle can be grouped reasonable,thereby reducing the amount of calculation.The main works of this paper includes:1.In order to understand the response of the cable to the high frequency electronic signals,the multi-conductor transmission line equation is deduced by the basic theory of electromagnetic field,and the idea of finite difference in time domain is used to separate the multi-conductor transmission line equation into the spatial domain and time domain to get the recursive form.2.Based on the analysis of the characteristics of the internal electrical response of the multi-conductor transmission line,simplify the model of multi-conductor transmission.Caculate the parameters of the cross section of the equivalent model by taking the advantage of the capacitance and inductance matrix analysis of the multi-conductor transmission line.The validity of the equivalent model of the equivalent cable bundle method and the effective degree of the calculation are verified by experiments.3.Aiming at the shortcoming that the traditional equivalent wire harness method can not effectively solve the problem of electromagnetic compatibility of multi-conductor transmission line above a non-infinite and non-ideal ground plane,propose the equivalent beam method in cylindrical metal cavity.Calculate the capacitance inductance matrix by using the mirror principle and then equivalent formula of the equivalent cable bundle method in this case is solved by the simultaneous equation.For the defect that traditional method can not solve the problem of termination frequency variable load,propose to solve the problem by using the weighted average of loads in the maximum effective frequency range.4.Apply the equivalent wire harness method into the electromagnetic environment of the electric vehicle.The radiation and radiation sensitivity comprehensive simulation are carried out to verify the effectiveness of the equivalent cable bundle method in the complex environment.In the future,the equivalent cable bundle method can be applied to the emc issues in automobile ship and even aircraft.