Research On The Technique Of Simplifying The EMC Simulation Model

In order to simulate the electromagnetic compatibility of electronic equipment quickly and accurately, it is necessary to build a simple and reliable simulation model, so less time and computation load is needed. But due to the complexity of the practical equipment, which includes PCB boards and the tiny structures such as the tiny bulge or groove, and due to the shorts (the limits of computing manpower and computing time) of the present software, it is impossible to simulate the model just like what it is in actual. Therefore, simulation model has to be simplified or equivalent.In order to solve this problem, based on the theory of electromagnetic perturbation, this thesis presents a disposing method which could be used in the practical EMC simulation model, and then use this method in practical electronic equipment to prove its correctness and practicability. First of all, this thesis discusses the EMC simulation model of electronic equipments and stresses the main factors in simulation, including the simulation of aperture, the effect of aperture and hole on the shielding effectiveness, and small structures on simulation, at the same time, this thesis also discusses the simulation of radiant point. Secondly, based on the theory of electromagnetic perturbation, this thesis discusses the disposing method of both medium and metal perturbation with the first as the main purpose, and proves the correctness and practicability through some simple examples; finally, it introduces the practical application of the method that discussed above, and then does some experiment, at last, it compares the simulation result with the experiment result. Through this method, the modeling and simulation is much faster and the effectiveness of calculation is increased.