DC25_SLIDES_Drive_CommonModeandDifferentialMode_Foelkel_V2.pdf

1、Information Classification:GeneralWelcome to ConferenceJanuary 2830,2025Santa Clara Convention Center1ExpoJanuary 2930,2025 Information Classification:GeneralCommon Mode&DifferentialMode Noise SourcesSpeaker and Author:Lorandt Foelkel M.Eng,(Wurth Elektronik eiSos GmbH)2Information Classification:Ge

2、neralImageSPEAKERLorandt FlkelM.Eng,Wurth Elektronik eiSos GmbHLorandt.Foelkelwe-online.de|we-|askLorandtShort description:Lorandt Foelkel is field application engineer for EMI/EMC situation and switched mode power supply(SMPS)design for industrial-and automotive electronics applications.He is the c

3、ompany spokesperson for EMC&RF Electronic Design seminars and holds over the World more than 900 seminars to design engineers,giving training to easy understanding the EMC problems at board level.Information Classification:GeneralLets start with questions4Do you think that a DC/DC converter can“gene

4、rate Conducted Emission”?the EMC of a DC/DC converter is“affected only from the PCB layout”?with an“oscilloscope you could solve all EMI situations”?Information Classification:GeneralFlyback EMI-Schematic-V2022.15Information Classification:GeneralFlyback EMI-Demonstration Board-V2022.16ToplayerInfor

5、mation Classification:GeneralFlyback EMI-Demonstration Board-V2022.17BottomlayerInformation Classification:GeneralDemonstration Board V2022.1-with Modification8Information Classification:GeneralTest Demo Board V2022.1 with Modification for Total Conducted Emissions9-100102030405060708090100110100 kH

6、z1 MHz10 MHzLevel(dBV)FrequencyTest3Test4Test5Test6Test755032QP Class B55032AV Class B30 MHzCombinedVsuppDCDCNamecDescriptionTest#3Reference(no improvement)Test#4Test#3+RCD-snubberTest#5Test#4+primary to secondary y-capacitorsTest#6Test#5+CMC and y-capacitors(CM filter)Test#7Test#6+x-capacitor(DM fi