SIMPLIS Technologies attended APEC 2025 in Atlanta, GA, where we presented an Exhibitor Seminar session on "Simulating the Conducted EMI Performance of a Switching Power Supply":
Using the new LISN block (available in SIMetrix/SIMPLIS v9.20b+), we show how to measure the conducted EMI performance of a switching power supply. A comparison of the measured results against an EMI specification is performed using a Design Verification Module (DVM) post-processing script implemented in Python, the results of which are used to determine the attenuation requirements for an EMI filter. With those requirements, we calculate the EMI filter component values utilizing the optimizer function in SIMetrix/SIMPLIS. We then measure the EMI performance of the resulting combination of power supply and EMI filter to verify that the performance meets the EMI specification. Finally, we verify that the power supply with EMI filter meets system stability requirements.
A copy of the presentation slides and schematic files can be downloaded here.
About SIMPLIS Technologies
SIMPLIS Technologies, Inc., headquartered in Portland, Oregon, is the technology leader in simulation software for the power electronics industry. SIMPLIS is the leading simulation engine for switched mode power supply design and has been rapidly adopted by leading OEM, power supply, and IC Controller manufacturers in recent years. It has become the standard for power supply system simulation and new product definition analysis.
Contact Information
SIMPLIS Technologies, Inc.
PO Box 40084
Portland, OR 97240-0084
Phone: 503 766 3928
Fax: 503 296 5674
Email: info@simplistechnologies.com