EMC Considerations in Switching Power Supply Design

This one-day seminar covers EMC issues associated with Switch Mode Power Supplies (SMPSs). The material is applicble to AC/DC and DC/DC converters, as well as PCB mounted power modules. Models are developed for both the common-mode and differential-mode emission sources within the power supply, and power line filter design is examined. A graphical approach to power line filter design is presented and explained. Troubleshooting procedures and worldwide EMC regulations are also covered.

Outline

CONDUCTED EMISSION MODELING

Power Supply Noise Sources
Common-Mode Emission
Differential-Mode Emission
PCB Layout Issues
Power Line Filters
Filter Layout and Mounting
Common-Mode Chokes
Leakage Inductance
Rectifier Diode Noise
Power Supply Stability
High-Frequency Output Filtering
Harmonic Suppression

WORLDWIDE EMC REGULATIONS

North America
European Union
Military

POWERLINE FILTER DESIGN

Graphical Attenuation Method
Advantages
Graphical Procedure
Handling Parasitics
C-M Design Example
D-M Design Example

TROUBLESHOOTING CONDUCTED-EMISSION PROBLEMS

Differentiating Between C-M and D-M emission
C-M/D-M Rejection Networks
Detecting C-M Choke Saturation

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Henry Ott Consultants

48 Baker Road Livingston, NJ 07039

Phone: 973-992-1793, FAX: 973-533-1442

e-mail: h.ott@att.net

November 4, 2010