ANALYSIS TYPE / 02
LISN · power line noise · filter design
Overview
Simulating conducted emissions on power and signal lines — predicting noise voltage and current measured at LISN points and designing input filters to achieve compliance with CISPR 11/22/32 conducted limits.
Deliverables
Key Aspects
Modelling conducted emission measurement setups including LISN impedance, referencing simulated results to the standardised CISPR measurement methodology for direct limit comparison.
Separating conducted noise into common mode and differential mode components to determine the appropriate filter topology — X-capacitors, Y-capacitors, common mode chokes — for each noise mechanism.
Designing and optimising EMI input filters for switching power supplies and motor drives — selecting component values, insertion loss targets, and filter topology to achieve CISPR compliance.
Modelling conducted noise generated by DC-DC converters and analysing how PCB layout, transformer construction, and output filtering affect LISN-measured emission levels.
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