Comprehensive Surge Analysis: Shielding Cable Response and Power Port Protection Circuit Design

This paper introduces two surge generation circuits designed to comply with the IEC61000-4-5 standard. Leveraging these circuits, we conduct a comprehensive investigation into the impact of surges on shielding coaxial cables through simulation. The analysis involves calculating the noise coupled into the inner signal wire across various cable lengths. Additionally, surge noise is applied to the power port, prompting an initial exploration of Coupling/Decoupling Network (CDN) modeling. The study extends to the comparison of three surge protection circuit configurations in the power port through both simulation and measurement. A model incorporating a variable capacitance was established to enhance agreement. The alignment of simulation and measurement results serves as valuable guidance for the early-stage design of surge protection circuits in projects.