An EMI Reduction Modeling Approach of PCB & Shielding Enclosures Using the Lua-based Automation
This article presents an efficient model for reducing the radiated emission from digital printed circuit boards (PCBs). The presented method is based on electromagnetic (EM) simulation combined with an automation script. A given product with a PCB, especially in the automotive domain, tends to have a multi-variant model based on the main PCB design to satisfy the different electromagnetic compatibility (EMC) requirements. For example, only minor changes in the bill of materials (BOM), such as passive components or shield parts can occur on the same PCB. In this case, analyzing and predicting the relative radiated emission noise through simulation for each variant model is useful. The conventional method of simulating every model separately, even if the PCB design is the same, is necessary but time-intensive due to the vast number of simulation objects at hand. The proposed method, however, in which the major components are changed on the PCB, can reduce the simulation time by ~70%. The model discussed in this article, consists of a PCB solver and a 3D EM solver controlled by Lua scripting language for automation of the radiated emission simulation. The results show that the EMI spectrum is compliant with the CISPR-based automotive EMC standard and the effectiveness of the proposed methodology is validated.
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Automotive, Consumer Electronics