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Supply Controller (continued)

Discussion in 'Electronic Design' started by Robert Baer, Nov 12, 2012.

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  1. Robert Baer

    Robert Baer Guest

    For schematic of my "controller" see http://www.oil4lessllc.org/Misc/ .
    Some responders in the past indicated that the source had to be
    pulled down to ground for the dratted IR2118 to work properly.
    Note in my case i need the output to be adjustable from somewhere
    near ground (50V will do) to somewhere near supply (120V), and that
    voltage have little ripple (say under 10% or 10V - whichever is
    reasonable for supply to bottom of flyback in TV.
    As shown, i do not get an adjustable voltage, and it is fairly low.

    Clues please to get this to work (or an alternate that is cheeep.
    Thanks.
     
  2. Guest

    what are you trying to do, could you make a simple schematic?

    -Lasse
     
  3. Robert Baer

    Robert Baer Guest

    Please READ the first line..
     
  4. Guest

    That is for you "controller", I mean a schematic of the system, the
    supplies,
    the load etc.

    when you say bottom of flyback, I'm imagining you need a supply that
    can sink
    current?

    -Lasse
     
  5. Robert Baer

    Robert Baer Guest

    Full manual for the TV set, and extracted schematic, with selected
    info now added to http://www.oil4lessllc.org/Misc/ .
    I have added a pulse transformer..the IR2118 is now driving its
    primary, and a 1K added from Vs (pin 6) to ground lets it work nicely.
    Still do not get adjustable range desired.
    The pulse transformer used is the Murata 78601/2C (500uH) and does
    not "transmit" the full width of the pulse:

    |---\ <--full 12V
    | \
    | | v--rather small level
    | |-----|
    -----| |------ 0V

    <--5uSec--> Pulse transformer loading is the FET gate

    Would a 10,000uH pulse transformer work better?
     
  6. Tim Williams

    Tim Williams Guest

    More inductance isn't the problem; you need one with a higher V.us flux
    rating.

    In that particular series, they use Ferroxcube 3F3 cores, so a higher
    inductance will be consistent with higher flux, not just a higher
    permeability core.

    Tim
     
  7. Robert Baer

    Robert Baer Guest

    Thanks.
     
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