Group, I was doing some tests of conducted EMI measurements according to CISPR 22, Class B. This standard uses the 150kHz to 30MHz frequency range.
The equipments under test (EUT) that I tipically use are switched mode power supplies (SMPS), mainly with flyback topology. In a number of these SMPS that I've tested, I found that there are strong peaks about 10MHz-30MHz frequency range. According to some bibliographic references (books, Web, papers) these peaks are due to radiation coupling between the elements of the SMPS, and not due to harmonics of the switching frequency. Another explanation could be a resonance between accidental L and C (probably parasitic elements). My question is: Would someone give me some advice on these informations?? Past experiences, papers, comments, WWW addresses... all information is welcome. Thanks! Muriel ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
