The above Ad will no longer appear after you Sign Up for Free!

Dimmer, Phase Control

Discussion in 'Wiki' started by STEVETERRY, Aug 14, 2008.

  1. STEVETERRY

    STEVETERRY Well-Known Member

    Messages:
    1,368
    Likes Received:
    719
    Location:
    New York
    The most common dimmer type in entertainment lighting systems. Uses a thyristor (SCR or Triac) to switch the AC waveform to vary the amount of power to a load. Produces a non-sinusoidal voltage output waveform, and draws current in a non-sinusoidal waveform that produces harmonics.
     
  2. derekleffew

    derekleffew Resident Curmudgeon Senior Team Premium Member

    Messages:
    4,445
    Likes Received:
    2,845
    Location:
    Las Vegas, NV, USA
    Dimmer, Non-Phase Control:
    1. Resistance
    2. Autotransformer
    3. IBGT/IGBT/LGBT?
    4. Sine-wave
    5. L209
     
    Last edited: Aug 14, 2008
  3. cutlunch

    cutlunch Active Member

    Messages:
    522
    Likes Received:
    21
    Location:
    Auckland, New Zealand
    Derek is No. 3 meant to be IGBT ( Insulated Gate Bipolar Transistor).

    From my electronic studies I believe you will find a number IGBT Dimmers are in the phase control family. Actually they are known as reverse phase control.

    Because instead of turning on part way through the AC phase cycle IGBT's can turn off part way through the AC phase cycle controlling the power to the load. There is less of a spike raised at the turn off of the AC cycle part way through then there is using SCR's, TRIAC'S that turn on part way throught the AC cycle. So interference is less.

    If you are referring to IGBT's being used in PWM (Pulse width Modulation) dimmers which produce Sine waves then this would be a non phase control system.
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice