Electromagnetic Interference Analysis, Modeling, and Suppression of High-Power Pulse Drive Source

In high-power pulse drive (HPPD) sources, the pulse forming network Marx (PFN-Marx) generates ultra-fast transient overvoltages with steep rising edges and a broad frequency spectrum extending to 100 MHz. Transient interference can propagate via cables into sensitive circuits or radiate through space, impacting nearby equipment. To address the limitations of existing electromagnetic interference (EMI) models and testing standards in accurately characterizing the time–frequency features of ultra-fast transient disturbances, this study systematically investigates the characteristics of interference sources within HPPD systems. The innovative modeling approach integrating interference sources is proposed, leading to the development of a novel transient interference model utilizing attenuated damped oscillation waves. This model effectively captures the characteristics of ultra-fast transient interference and provides a versatile tool for EMI prediction and analysis across different types of HPPD systems. The study offers essential theoretical guidance for electromagnetic compatibility (EMC) design of secondary equipment in high-power pulse systems, greatly enhancing their reliability and safety under challenging electromagnetic conditions.