From: hill@rowland.harvard.edu   
      
   John Larkin wrote...   
   > Winfield Hill wrote:   
   >>John Larkin wrote...   
   >>> Winfield Hill wrote:   
   >>>> John Larkin wrote...   
   >>>>> Winfield Hill wrote:   
   >>>>>> John Larkin wrote...   
   >>>>>>>   
   >>>>>>> You can do fun switcher tricks with a dual inductor.   
   >>>>>>   
   >>>>>> Coupled inductor, John.  Coupled is the word to use.   
   >>>>>   
   >>>>> I ignore the Word Police.   
   >>>>   
   >>>> I have about 300 files in my computer concerning   
   >>>> coupled inductors, they're all the rage these days.   
   >>>> Most providers, and there are many, use the term   
   >>>> coupled inductor.  Your DRQ supplier, SRF and a   
   >>>> few others call them "dual winding."  TI and other   
   >>>> app note writers call them coupled inductors.  Both   
   >>>> Coilcraft and Coilmaster, who have piles of offerings,   
   >>>> call them coupled inductors.  Ditto Vishay and Wurth.   
   >>>> Published peer-reviewed papers say coupled inductors.   
   >>>>   
   >>>> If you want to search for them, coupled inductors is   
   >>>> the phrase.  Octopart comes up with about 1500 parts   
   >>>> that way, but only 184 searching for dual winding.   
   >>>> Of course, they're all the same bifilar wound stuff,   
   >>>> but that search term gets zero hits at Octopart. And   
   >>>> the O.P's title, bifilar inductor, gets only 5 hits.   
   >>>   
   >>> Digikey lists the DRQ series under category "Arrays,   
   >>> Signal Transformers" which is a bit strange.   
   >>>   
   >>> The Eaton data sheet calls them "Dual winding, high   
   >>> power density, shielded drum core power inductors"   
   >>>   
   >>> Bourns calls the SRF series "Dual-winding shielded   
   >>> power inductors"   
   >>>   
   >>> We stock them in the "transformers" category.   
   >>   
   >> Hah, three sets off.  I know Eaton and Bourns are in   
   >> left field about this, even though I like the Bourns   
   >> offerings.  Eaton's series has lots of nice physical   
   >> sizes.  I've long avoided calling them transformers,   
   >> as transformers generally have cores without gaps,   
   >> and the magnetizing energy stored in the primary's   
   >> inductance is a pain, rather than part of the work   
   >> underway.   
   >   
   >What about a flyback transformer? They are usually gapped.   
   >   
   >>A complete contrast to coupled inductors,   
   >> where the energy stored in the inductance is a main   
   >> part of the idea, and the coupled winding grabs it   
   >> for the purpose at hand.   
   >   
   >Wound magnetic things, and their circuits, are hard to describe in   
   >words, so I don't worry much over it. I certainly don't want   
   >somebody's words to tell me what I can/can't do with a part.   
   >   
   >I like "dual inductor" because it tells me there are two windings.   
   >Some things have three or more.   
      
    Hah, Well, I think we ran this topic into the ground.   
    It started when somebody typed sci.electronics.basics   
    w/o the s.  Sheesh!   
      
      
   --   
    Thanks,   
       - Win   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)