Phase Controller

Discussion in 'Homework Help' started by adimas33, Feb 16, 2012.

  1. adimas33

    Thread Starter New Member

    Feb 16, 2012
    3
    0
    hi all.
    i want to build a Phase controller.

    i've search the circuit in google. but when i tried to simulate in Multisim 11 (NI, workbench) the circuit wont work??

    the main purpose of the circuit, is to controll the power transfered to the load

    example : control the heat element

    any hint how to make a phase controller? or do sombody have the circuit?


    Ac source : 220V, 50hz

    Load : about 300kw


    thanks for your attention
     
  2. jimkeith

    Active Member

    Oct 26, 2011
    539
    99
    Last edited: Feb 17, 2012
  3. adimas33

    Thread Starter New Member

    Feb 16, 2012
    3
    0
    thanks to your reply

    yes i'd like to use TRIAC.

    but when im trying to make an RC triggering TRIAC. somehow i can't fire it freely from 0° - 180°

    and other option i had is by using external dc source for triggering. but i confuse how to make an zero crossover checking so i can made an delay to fire the triac based on zero cross over...

    do you have any circuit like that?
     
  4. jimkeith

    Active Member

    Oct 26, 2011
    539
    99
    for a 150A load???
     
  5. adimas33

    Thread Starter New Member

    Feb 16, 2012
    3
    0
    no...

    im about to control 3kW LOAD

    then based on P= V*I
    so it's 13.6

    i think TRIAC still can handle this.

    umm.. do you have any idea.. how to detec zero crossover ??
     
  6. Felo

    Member

    Feb 20, 2012
    91
    13
    Hi,

    I have made a circuit like this to load and test a 3 phase UPS, around a pic 16f886 worked like a charm.

    The way to solve the cero crossing, (at least how I did it) was to take some simple and cheap opto-coupler, put a 4007 diode in series with one phase, a BIG ceramic 10w resistor and the the anode of the led in the opto, the cathode went strainght to neutral.

    This will give you a pseudo square wave wich you can work with, feed this to the input pins of your favorite MCU then...........do the rest. Hope this is helpfull

    Good luck
     
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