This article analyzes EMI interference risks in precision equipment and explains the targeted customization principles, core technologies, and system installation standards of power filters for medical, industrial and aerospace fields, demonstrating how professional filters ensure high‑clean power quality for high‑end industries.

This article focuses on power line filters against the background of import substitution in domestic manufacturing. It introduces power line filters as key passive components for EMC compliance. The content covers core definitions basic characteristics working principles for both differential mode and common mode interference, product classification by power supply type application scenario and circuit topology, as well as standardized engineering installation requirements. It also points out the growing market demand for high performance filters in industrial medical telecommunication and new energy industries, and reminds users that proper model selection and standard installation are critical to give full play to filter performance.