Design technologies for low-EMI notebook personal computers

摘要

Advances in computer science and hardware in recent years have made possible three-dimensional simulations of electromagnetic interference (EMI) phenomena. We at Mitsubishi Electric have developed a simulator and are now utilizing it to analyzethe relationship of radiation intensity to current densities in printed circuit boards (PCBs) and the structure of liquid-crystal displays (LCDs); the results of which are applied to product design. This represents a new direction for research.In this paper, we describe LCD designs to reduce emission noise, drawing on measurement results obtained using a three-dimensional electromagnetic field simulator (MAGNA/EMI) based on a finite element method and developed jointly by Mitsubishi Electric'sAdvanced Technology R&D Center and the CRC Research Institute.