You can get SCRs up to 7KV withstand, or you can stack them to get the voltage rating if you do it right. The critical parameters are maximum rate of current rise and peak current capability. In general, you'd want an SCR rated for inverter duty as these are much faster than the ordinary phase control variety. Still, you will be working in microseconds, not nanoseconds. Spark gaps and electromechanical switches are clumsy devices, but still can't be beat for abrupt risetimes at very large power levels. I'm wondering if there is a mercury contactor rated for your voltage requirement. Also, perhaps instead of simulating a defibrillator you could use a real one. I've seen used ones.
Orin Laney On Wed, 4 Nov 2009 19:15:20 -0000 John McAuley <john.mcau...@cei.ie> writes: > On a related subject, what do you use for the switch in these surge > generators? I have seen electro mechanical switches and I believe > some of > them use SCRs? Is there a readily available high voltage switch that > can do > it? > > We have a need to test a medical device using a 32 µF cap charged to > 5000V > for one of the 60601 standards to simulate a defibrillator. We were > going to > modify an old Haefely P6T. > > Regards > > John > > > DISCLAIMER: The information contained in this e-mail may be > confidential > and is intended solely for the use of the named addressee. Access, > copying > or re-use of the e-mail or any information contained therein by any > other > person is not authorised. If you are not the intended recipient > please > notify us immediately by returning the e-mail to the originator > > > > -----Original Message----- > From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of > Brian > O'Connell > Sent: 04 November 2009 18:43 > To: EMC-PSTC@LISTSERV.IEEE.ORG > Subject: RE: [PSES] Discharge capacitors > > For this particular application, how does the ribbon stuff compares > to > braided ground straps? > > I am about to build something similar, and would like to know if > someone has > already experimented with this. > > thanks, > Brian > > -----Original Message----- > From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of Fred > Townsend > Sent: Wednesday, November 04, 2009 10:36 AM > To: ola...@juno.com > Cc: lfresea...@aol.com; EMC-PSTC@LISTSERV.IEEE.ORG > Subject: Re: [PSES] Discharge capacitors > > Derek : I think Orin offers good advice. You also need to pay > attention to > your network geometry. i.e. Inductance is your enemy. Two 10 uF caps > in > parallel are better than one 20 uF. Straight runs of ribbon wire are > better > than coils of round wire. > > Regards, > Fred Townsend > DC to Light > > ola...@juno.com wrote: > The usual suspects are NWL in North Carolina, CSI in California, and > General > Atomics (formerly Maxwell). They all know what they are doing and > have low > inductance pulse rated caps capable of multi-kiloamp discharge > peaks. > > Orin Laney / Atwood Research > > On Wed, 4 Nov 2009 11:04:51 -0500 lfresea...@aol.com writes: > Good morning folks, > > I have been working on improving the quality of my lightning > simulator and > have come to the conclusion that I need better capacitors. > > Can anyone share their opinions on manufacturers and/or models that > are > appropriate. > > An offline response may be appropriate. > > Sincerely, > Derek Walton > L F Research > > - > ---------------------------------------------------------------- > 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.ieeecommunities.org/emc-pstc > Graphics (in well-used formats), large files, etc. can be posted to > that > URL. > > 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...@socal.rr.com> > 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.ieeecommunities.org/emc-pstc > Graphics (in well-used formats), large files, etc. can be posted to > that URL. > > 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...@socal.rr.com> > 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.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. 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...@socal.rr.com> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
