Although, the 3d edition of IEC 60601-1 'appears' to relax test requirements for a component P.S. (and explicityly allows the use of I.T. approved units), and I recommend that you avoid the temptation to reduce these tests to that of 'transformer'.
My employer makes many custom and off-the-shelf power supply models that are certified to medical standards, and we encourage our customers to repeat certain SFC tests and abnormal operating conditions in the end-use installation. Also, try to get a copy of the CB Test Report. Carefully review the tests, test conditions, and what failed as a result of the test. The performance of the P.S. during abnormal operating conditions should drive the conditions of acceptability for the end-use installation. Requirements for SFC test and abnormal operating conditions will be dependent on the affect of the end-unit installation has on the component power supply. And yes there are, in fact, specific requirements in 601-1 that would apply to a component power supply. Read the standard again. No, again. luck, Brian > -----Original Message----- > From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of Paolo > Peruzzi > Sent: Thursday, March 22, 2007 7:25 AM > To: emc-p...@ieee.org > Subject: SMPS test according to IEC 60601-1 > > Dear group, > > I would like to gather some opinions about safety tests on > switch mode power > supplies within medical devices, according to IEC 60601-1. > My question arises because a test house technician told me he > used to test > power supplies as they were transformers, for what concerns > short circuit > and overload tests, on each dc output. > I couldn't find such requirements for power supplies in the > standard (I > couldn't find any!!!), but I think it would be at least wise > to do these > tests. > Do you think they should be included as single fault > condition tests, even > if not mentioned? > Any other thoughts? > > Thanks, > > Paolo Peruzzi > Regulatory Medical R&D > El.En. S.p.A. > Via Baldanzese, 17 > 50041 Calenzano (FI) > Italy - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.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...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
