Be careful to model right. In DM mode the parasitic elements in a DM coil are in parallel,
in anti-parallel (CM) configuration they are in series. The ratio between induction and stray inductance is not more then 100:1 in most CM coil so 100:2 in DM mode This severely limits the usable frequency range. The stray inductance remains in series with the DM signal. Gert Van: ralph.mcdiar...@schneider-electric.com [mailto:ralph.mcdiar...@schneider-electric.com] Verzonden: vrijdag 15 juni 2012 19:29 Aan: ce-test, qualified testing bv - Gert Gremmen CC: EMC-PSTC@LISTSERV.IEEE.ORG Onderwerp: RE: DMRN for 4 wires (EMC) Thanks Gert. We were thinking 4-wire LISN (phase A,B,C and Neutral) Your idea of two sets could work; I'd likely simulate on SPICE, then arrange a breadboard if those results looked promising. _______________________________________________________________________________ Ralph McDiarmid | Schneider Electric | Solar Business | CANADA | Regulatory Compliance Engineering From: "ce-test, qualified testing bv - Gert Gremmen" <g.grem...@cetest.nl> To: <ralph.mcdiar...@schneider-electric.com>, <EMC-PSTC@LISTSERV.IEEE.ORG> Date: 06/15/2012 02:04 AM Subject: RE: DMRN for 4 wires (EMC) ________________________________ Just use 2 sets of 2 anti parallel CM coils and couple the common via a third to ground (I suppose). I do not know your specific application, but in general DM signals come in paired sets of 2…… The only application I know where DM is over 4 wires, is a phantom signal in phone lines. Gert Van: emc-p...@ieee.org [mailto:emc-p...@ieee.org <mailto:emc-p...@ieee.org> ] Namens ralph.mcdiar...@schneider-electric.com Verzonden: Wednesday, June 13, 2012 7:06 PM Aan: EMC-PSTC@LISTSERV.IEEE.ORG Onderwerp: Re: DMRN for 4 wires (EMC) A DMRN (Differential-Mode Reject Network) works well for 2-wires, but has anyone tried for 4 wires? I suppose a common-mode transformer with a bandwidth up to 30MHz would do. Any suggestions from the RF gurus in the group? _______________________________________________________________________________ Ralph McDiarmid | Schneider Electric | Solar Business | CANADA | Regulatory Compliance Engineering - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <emcp...@radiusnorth.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org> David Heald <dhe...@gmail.com> ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. ______________________________________________________________________ - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <emcp...@radiusnorth.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
