Ken, well versed with Mark and his book. Excellent. not sure I totally agree with you on the leakage statement, but I agree it plays a big role.
I had Marks phone number somewhere, but can't pull it to hand: would you still have it? Suggest you send it direct. Thanks, Derek. Ken Javor wrote: > The expert on this subject is Mark Nave ([email protected]). He has a > book out (probably out-of-print now) on "Power-Line Filtering for Switched > Mode Power Supplies." Also a paper in the 1991 IEEE EMC Symposium record, > "On Modeling the CM Inductor." In that paper, he shows how to calculate the > leakage inductance (dm component of cm inductance). It is this leakage > inductance which causes saturation. > > ---------- > >From: Derek Walton <[email protected]> > >To: IEEE EMC Discussion Group <[email protected]> > >Subject: Common Mode Choke > >Date: Thu, Dec 2, 1999, 1:46 PM > > > > > > > Good day all, > > > > I'm refining the input filter of a 150 watt SMPS. Nothing flashy, just a > > few caps and a common mode choke. > > > > The current is drawn by the supply in short bursts as the DC link cap is > > charged. I've shown that peak current reaches 6 amps for up to 2 ms. > > I've also demonstrated that the CM choke, while rated for the RMS > > current ( a 2 amp device ), does saturate when the current exceeds about > > 4 amps. > > > > I've been trying to find out from the vendors, what current it takes to > > saturate the CM choke. I've had answers from CM chokes can't saturate to > > "that's not an important parameter, use the rms figure".... > > > > My question is, with over 20 potential vendors of this type of > > component, is there any way I can find out saturation performance > > without buying one of each type and testing it. I've played with 3 so > > far, the most expensive was NOT the best! I guess, I'm curious why more > > folks don't know about this effect also..... > > > > Thanks, > > > > Derek Walton > > Owner > > L. F. Research EMC Design and Test Facility > > 12790 Route 76, > > Poplar Grove, > > IL 61065. > > www.lfresearch.com > > > > > > --------- > > This message is coming from the emc-pstc discussion list. > > To cancel your subscription, send mail to [email protected] > > with the single line: "unsubscribe emc-pstc" (without the > > quotes). For help, send mail to [email protected], > > [email protected], [email protected], or > > [email protected] (the list administrators). > > > > -- Derek Walton Owner L. F. Research EMC Design and Test Facility 12790 Route 76, Poplar Grove, IL 61065. www.lfresearch.com --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
