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power factor correction circuits wanted

Discussion in 'Electronic Design' started by Razor's Edge, Jul 12, 2003.

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  1. Razor's Edge

    Razor's Edge Guest

    Hi all,

    I'm looking for different circuits which perform the power factor correction
    in smps designs.
    Most of interest, is the active pfc type which in principle is a step-up
    converter in the middle of the mains rectifier bridge and the large
    In other words, sources of information with contents regarding active pfc
    design is highly appreciated,
    schematics, components, design-methods and so on will be fine.
    Since the regulations here in Sweden, forces us to use pfc, I must implement
    this in my coming designs.
    Powerlevels from 50W beyond 2kW!

    Best regards
  2. John Fields

    John Fields Guest


    yields over two million hits.

    Perhaps you might find something of interest there?
  3. Razor's Edge

    Razor's Edge Guest


    For god sakes, you must be kidding me.. .. .. .. .. ....

    Of course, I've done numerous of searches and checked lots of ic's and so on
    for the task, what do you think??
    But maybe there are somebody in this cute NG who's got valueable info or has
    designed such a circuit himself.

    Oh well......

    --- Stefan
  4. Bill Sloman

    Bill Sloman Guest

    John Fields models himself on the Microsoft help desk, though there doesn't
    seem to be a knowledge database in his system.

    I poked around looking at power factor correction circuits a few years ago,
    and at that time there seemed to be one standard circuit, and a couple of
    different high voltage ICs to implement it. I did find one academic paper
    proposing a different scheme which avoided the high voltages. None of this
    lead to the construction of any hardware, so I haven't got any useful
    information to pass on, any more than John has.
  5. legg

    legg Guest

    You'll find that most PFC circuits are application-specific. Their
    suitability is determined by the requirements in each case.

    - load classification and industry sector
    - applicable standard (and rev)
    - input voltage range
    - power level
    - application environment
    - mfring volume and cost sensitivity
    - end-user-specified bells and whistles (may include such basic
    requirements as size and weight but may extend to a variety of
    esoteric features that even the specifier is unwilling/unable to
    explain or modify).

    There are a number of references that examine current topologies.

    "A Topology Survey of Single-Stage Power Factor Corrector
    with a Boost Type Input-Current-Shaper"
    Chongming Qiao and Keyue M. Smedley

    "Some Topologies of High Quality Rectifiers,"
    R. W. Erickson,

    "Generalized topologies of single-stage input-current-shaping
    L. Huber, J.Zhang, M. M. Jovanovic, and F. C. Lee topologies ss.pdf

    "Comparative Study of Power Factor Correction Converters
    For Single Phase Half-Bridge Inverters"
    Gui-Jia Su, Donald J. Adams, Leon M. Tolbert,

    You should be able to find more information, on both active and
    passive methods, on the web. You should examine your application to
    identify just what is important, before picking a topology.

  6. John Smith

    John Smith Guest

    Hi, Stefan.

    I suggest you contact your favorite IC manufacturer. They usually have many
    application notes and ICs for power factor correction. Here is one such:"POWER+FACTOR+CONTROLLER"

    (AN510 by ST Microelectronics using L4981 IC, goes to 3kW). Get the PDF

    Good luck.

  7. John Fields

    John Fields Guest

    What makes you think that? If you spend any time around here you'll
    inevitably run across idiots who are too damned lazy to do anything for
    themselves and want everything handed to them on a silver platter. If
    that's not you, fine.
    I think you should have included that information in your first post in
    order to establish a baseline.
    I have an article from the March 7,1996 issue of EDN's product edition
    entitled "Power Factor Correction What does it do? How does it do it?
    Why is it important?", and If you like I'll scan it and post it to

    Or, for a good laugh, you can read Bill Sloman's valuable post about how
    he can't help.
  8. You could at least mention John F.

  9. Hey RL, All good stuff.
    I have an extra bedroom, why not come stay for a few weeks.
    Ah, just a thought!!

  10. Razor's Edge

    Razor's Edge Guest


    Just a thought??? I've already started to pack my bags.........
    Couldn't say no to such an offer!!!!

  11. Razor's Edge

    Razor's Edge Guest


    Sure I would like to see the schematics,
    if you've got the time to do it, of course.

    --- Stefan
  12. Bill Sloman

    Bill Sloman Guest

    John - possibly deliberately, though he is pretty stupid - missing the
    point that my post was in fact apologising for his boorish and
    unhelpful behaviour. For someone with very little to contribute, he is
    very free with posts telling people that they should have posted more
    detail, or google the answer for themselves.

    He obviously hasn't got a clue about power factor correction, and is
    too much the loud-mouthed redneck to let this inhibit his braying. I -
    almost unavoidably - know more than he does about pfc, but not enough
    to give useful advice, for which I took the trouble to apologise.
  13. Fred Bloggs

    Fred Bloggs Guest

    Well- let the OP post some representative specs and then JF can reply
    with a sample design- organizing all the pertinent equations in a nice
    neat tabulated display to show how simple and straightforward it all is.
  14. Nico Coesel

    Nico Coesel Guest

    Looking into patents may help to get an idea what other people already
    cooked up. The patents with test results are the most interesting

    Anyway, what is the minimum angle you need to comply to?
  15. John Fields

    John Fields Guest


    All you were doing was taking a swipe at me.

    If, in fact, you were taking the trouble to apologize for not being able
    to give useful advice I suspect the rest of your apologies along those
    lines would quickly saturate Usenet!
  16. John Fields

    John Fields Guest

    Sorry, boys, it doesn't work like that. I volunteer when I feel like
    helping or feel I _can_ help, not when some thug tries to force me into

    Funny, though, Sloman starts throwing names around and up rear ugly
  17. Jim Thompson

    Jim Thompson Guest

    Hey, John, Relax, It's only Fred ;-)

    ...Jim Thompson
  18. Stefan,
    RL is the man, you on the other hand would have to bring more than just
    your razor to make the stay worth while.

  19. Razor's Edge

    Razor's Edge Guest

    he he ..... yep, I noticed my little mistake later....

    Since I now see the offer wasn't for me, I'll have to unpack my bags, and
    drink all the beer myself...... ;-)

  20. Jim Thompson

    Jim Thompson Guest

    A lot of ISPs won't accept that size of E-mail. For example, Cox
    Cable limits you to 2MB (inbound).

    John, Can you put it up on your website? If not, drop me an E-mail
    and I'll provide you a private FTP. I'll then move it to a public
    area on my website.

    ...Jim Thompson
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