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SCR dimmer control for portable electric heater??

Discussion in 'Electronic Repair' started by [email protected], Mar 21, 2010.

  1. mike

    mike Guest

    You probably shoulda been more accurate with your initial
    "radiator" description.
    Garbage in >>> garbage out...
     
  2. GregS

    GregS Guest

    It will reduce the current to (approximately) half, which will reduce
    the heat output (power) to one-quarter that of a single unit. Power is
    I^2*R.
    [/QUOTE]

    You forgot to multiply twice the resistance. It will be 1/2 the watts total.
    Each unit will be 1/4.


    greg
     
  3. Guest


    Is this called a "Variac"?
     
  4. Not really, a variac is just a variable auto-transformer. giving
    you a 0-100% range of output vs input voltage, and has a defined
    curent limit based on physical size.

    The variable inductor, is more of a magnetic amplifier type of
    device and relies on the core of the inductor saturating to vary
    the series imedpance with the load.

    Jeff
     
  5. Phil Allison

    Phil Allison Guest

    "Robert Macy"

    well said, now include the thermal coefficient for the filament...


    ** It a HEATER - you fucking IMBECILE.



    .... Phil
     
  6. Do you eat with that same mouth?

    Admittedly, if the heating element is Nichrome, it
    doesn't have much of a temperature coefficient.

    Jeff
     
  7. Phil Allison

    Phil Allison Guest

    "Jeffrey D Angus"

    **Do you always REMOVE the context entirely when posting

    great lumps of BULLSHIT like this ??


    ** No fooling ??????????????

    Now tell that BULLSHITTING TROLL Macy too.

    An leave the FUCKING CONTEXT visible.

    Idiot.



    .... Phil
     

  8. Ok, Do you eat with that same mouth Phil?

    Jeff
     
  9. "Robert Macy" <> schreef in bericht
    |2nd attempt to post this reply!
    |
    |use a saturable core reactor, which is a variable inductor controlled
    |by a DC current through a secondary winding. Used to be made by
    |Northlake near Chicago.
    |
    |The inductor, with 0 DC current has maximum inductance and 'starves'
    |the resistive load down to 5 to 10%, then at maximum DC current the
    |inductor is saturated and almost all the power makes it to the load.
    |The transfer/control is monotonic, but very weird. L vs Idc
    |
    |The DC control winding is wound in a 'fgirue eight' pattern so that
    |one adds, one subtracts with no net to the other winding, but due to
    |the high number of turns, saturates the core locally. Saturating
    |locally interrupts the magnetic field lines and is like opening up a
    |large air gap in the core, thus the inductance drops to nil.
    |
    |I prefer radiant heaters, too. You can point them at yourself and sit
    |very comfortably like in front of a fireplace. Used to have hot air
    |blast heating but that made the room's air excessively hot in order to
    |be comfortable when sitting. Then when you get up and move around you
    |swelter. Whereas with radiant heat, the air can stay cool so when you
    |move around, you're still comfortable. But those contact closures!!!
    |very irritating if you went to sleep, they get very loud.
    |
    |The variable inductor is great for controlling resistive loads
    |especially in the 1kW to 10kW ranges. ...you can actually make your
    |own if you want.
    |
    |

    Interesting solution though to me it looks like an overkill in space, weight
    and cost. Modern electronics might not be that interesting but are very
    effective.

    petrus bitbyter
     
  10. Phil Allison

    Phil Allison Guest


    ** Go get totally fucked

    - you pathetic pedant & self appointed net cop TWAT.



    .... Phil
     
  11. Wheee! This "Phil Allison" ride is a great thrill, eh?
    No, any response he doesn't agree with. He can be quite courteous, if you
    don't say something he finds insufferably stupid.
     
  12. Wheee! This "Phil Allison" ride is a great thrill, eh? I see they
    finally fixed it so that it works reliably now. Any response gets a
    torrent of abuse ...
     
  13. Phil Allison

    Phil Allison Guest

    "Robert Macy"

    Not a troll, and there is value to what I say.


    ** ROTFL !!!

    Satan is telling us how fine the weather is in hades.....




    ...... Phil
     
  14. mm

    mm Guest

    And in the very first post too.

    "I have one of those 1500 watt radiator style portable
    electric heaters. Love it"

    I know what a radiator style portable electric heater is, but now I
    have no idea what kind of heater he has.

    Still, I wouldnt' worry about contact points wearing out or burning
    out.
     
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