In message <[email protected]>, dated Wed, 8 Nov 2006, "Kunde, Brian" <[email protected]> writes >As you can image, such methods would be susceptible to AC line noise, >harmonics, dips, etc.. So we design immunity to such noise into our >products, but sometimes it is not enough.
The ultimate solution is to synchronize a separate 50 Hz oscillator to the incoming supply using a phase-locked loop, and waveform slicing to eliminate zero-crossing noise and 'flat-topping', and averaging to eliminate the effects of dips. Then use the zero-crossings of your oscillator output for switching. This may be patented. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Swine wave - a waveform whose spectrum is exceptionally difficult to calculate. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - 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 [email protected] 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 [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] 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 ______________________________________________________________________
