All kinds of questions come to mind. What is the frequency range of the outages? What is the radiating mechanism? Presumably the 48 Vdc input leads. Is it common mode or differential mode? Presumably common mode if it¹s radiating but if the wires aren¹t twisted during the test and they would be on-orbit, a dm component could cause problems. Do you meet CE102? If you do, you should meet RE102, at least in-band. What sort of filter is in place, and why isn¹t it effective? Meaning how it place topologically in the equipment enclosure to prevent re-radiation from the noisy side of the filter to the quiet side, as well as its insertion loss to cm and dm noise.
No converter will meet MIL-STD-461 CE/RE limits without a proper filter and placement. You want to know why this one is failing, even if you go to get another one. Else you will be fighting the same problems again. Ken Javor Phone: (256) 650-5261 From: S Drysdale <[email protected]> Reply-To: S Drysdale <[email protected]> Date: Wed, 24 Feb 2016 14:41:01 -0500 To: <[email protected]> Subject: [PSES] Recommendations for DC-DC converter All, My client has a very tight imposed limit for radiated emissions. Let's assume MIL-STD RE102 army ground. We are exceeding emissions caused by the DC-DC converter. Shielding is difficult in this application, and something we would like to avoid. Space requirements are an issue, and we think it may be easier to switch the module altogether. Input 48Vdc, Output is 12Vdc, 1.7A (or ~20W). Size is somewhat important, where smaller is better, but meeting this radiated emission limit is essential. Any recommendations? Best Regards, Scott Drysdale https://www.linkedin.com/in/scottdrysdale OOO - Own Opinions Only - ---------------------------------------------------------------- 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 <[email protected]> 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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher <[email protected]> David Heald <[email protected]> - ---------------------------------------------------------------- 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 <[email protected]> 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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
