Hi Kannon, Maybe ringing oscillation caused by the high inductance of the CDN and either a the capacitive output of the supply supplying your DC/DC converter via the CDN or perhaps the inductance or capacitance of the input of you converter.
Can you gradually crank up the supply to the CDN/EUT by gradually winding up the voltage or current limiten of the source supply to avoid a fast dV/dt on switch-on? Might help. Cheers, T ----- Original Message ----- From: Kannan Dhamodaran Sent: 10/03/13 02:17 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] EFT Generator series inductance Dear Members, Request your expert opinion on EFT generator CDN decoupling inductance. I’m facing a problem while connecting 48V DC-DC converter, with >6A input current, to EFT generator CDN. DC supply fed through CDN is unstable and produces huge ripple that leads to my DC-DC converter shutdown. This is observed while just powering ON and EFT not applied. With another make CDN the ripple is less and system works fine. I guess the decoupling inductance of CDN causes the ripple. Have any of you faced similar issue? What is the standard series impedance of a EFT – CDN network? Or are there any other angle to look for? Thank you all in advance. Best regards Kannan - ---------------------------------------------------------------- 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://www.ieee-pses.org/list.html (including how to unsubscribe) http://www.ieee-pses.org/list.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 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://www.ieee-pses.org/list.html (including how to unsubscribe) 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>
