高压大功率开关器件驱动电路的电磁散射分析OA

In order to investigate the influence of electromagnetic scattering phenomenon of metal conductors on the electromagnetic interference generated by high-voltage high-power devices on the surface of drive boards,based on electromagnetic basic theory,the scattering effect of unidirectional electromagnetic field encountering ideal conductors was analyzed.Simulation experiments simulated the changes in scattering field between the observation point and the metal conductor in different directions and distances under near-field radiation and far-field radiation when the power device was used as a radiation source.The results showed that in the far-field,the scattering field oscillated and attenuated periodically from the boundary of the scattering body to the surrounding area,and the size of the scattering field exponentially decreased with the distance from the observation point to the scattering body;In the near-field,the scattered electric field increases in the direction of the initial electric field,while the scattered magnetic field decreases in the direction of the initial magnetic field change.The field variation law in the two directions perpendicular to the initial electromagnetic field is opposite.The size of the scattered field decays exponentially with the distance from the observation point to the scatterer.Finally,the distribution of the scattered field in the near-field situation was experimentally verified.