Low Frequency PEEC Method Research And Application In Electromagnetic Compatibility

With rapid development and wide application of power electronics technology, the number of systems and equipment increased rapidly, resulting in a more complex electromagnetic environment. At the same time, high-frequency, high-speed, high sensitivity, high mounting density, high integration, high reliability, has become the trend of development about modern science and technology, and the application scope of modern science and technology more widely, has penetrated into every corner of society. The emergence of LSI will make humanity into the information age, information highway and high-speed computer technology has become the dominant technology of human's social production and life. One of the negative impact of the consequent problems is that the electromagnetic interference become more seriously, it also greatly promote the development of EMC technology. There are many typical numerical methods in the analysis of electromagnetic compatibility problems, but they are not effective in some special cases, such as great structure, so we introduced PEEC method for EMC analysis.The main work of this paper is studying about PEEC method in low-frequency and its application in electromagnetic compatibility. Firstly, from the Maxwell equations, based on the mixed potential integral equation, for a conductor plate structure with excitation wire loop, this paper have a uniform mesh. There are only the current cell in horizontal direction about this mesh, then, equivalent circuit model of each unit will be extended to the whole mesh network and we will get the matrix equation, thereby establish a low-PEEC model. Further analysis of the current distribution features in the conductor plate and distribution of flux density around the conductor, is the premise of the study design in magnetic shielding, and its accuracy is verified by comparing with the results of boundary element method.Secondly, for a typical ground conductor loop model, after a uniform discrete, we will get the current units not only in horizontal direction, but also in vertical direction, then obtained modified matrix equation. The current distribution of a typical large conductor ground loop and the effects on the current distribution due to frequency are achieved. The results demonstrate that current distribution of ground conductor is mainly concentrated in the vicinity of the ground electrode, and a potential difference is observed between two ground electrode because of the influence of inductance, which reveals the mechanism of common ground conducted interference in the ground loop. The proposed PEEC model is able to analyze the common ground interference and applied in interference suppression.