I recall that PFC circuits are generally based on a boost converter and that circuit arrangement if often challenging to tune for stable closed-loop response. I think PFC applications try to regulate both input current and output voltage; one is tightly regulated, the other is not. _______________________________________________________________________________
Ralph McDiarmid | Schneider Electric | Solar Business | CANADA | Regulatory Compliance Engineering From: John Woodgate <[email protected]> To: [email protected], Date: 09/17/2015 08:53 AM Subject: Re: [PSES] Unexplained High Fallout of Power Supplies In message <64D32EE8B9CBDD44963ACB076A5F6ABB02716FE8@Mailbox-Tech.lecotech.local>, dated Thu, 17 Sep 2015, "Kunde, Brian" <[email protected]> writes: > >These power supplies are power-factor corrected. I will check with >engineering if such components are damaged. As you describe the damage, the PFC circuit would be in that area, so it is involved. > >The large line filters are internal to our instruments so yes, they are >always in the circuit ahead of all AC within the instrument. I suspect that something is causing the stored energy in the filter to be dumped into the PFC circuit. This may be due to the PFC circuit itself. I was marginally involved in a discussion of stability issues in PFC circuits, but it was highly mathematical so I didn't learn much. -- OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk When I turn my back on the sun, it's to look for a rainbow John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - ---------------------------------------------------------------- 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]> ______________________________________________________________________ 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 <[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]>
