Point on wave device

Discussion in 'The Projects Forum' started by topopo, Sep 24, 2009.

  1. topopo

    Thread Starter New Member

    Sep 23, 2009
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    Hello everyone,

    I am trying to find a device that can turn ON an inductive load at a specific angle (0; 45; 90 deg etc) on the voltage wave.

    Could anyone please suggest how I should start this project?

    Better yet, if anyone could point me to the right direction where I can buy a product like this off the shelf that would be the ideal.

    Thanks all,
    Peter
     
  2. JDT

    Well-Known Member

    Feb 12, 2009
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    85
    A phase-controlled triac or SCR will do this.
    What is your application?
     
  3. topopo

    Thread Starter New Member

    Sep 23, 2009
    4
    0
    Hello JDT,

    Thanks for your reply. I will do some research on the phase-controlled triac.

    My application is to trigger (latch on) a contactor at a specific angle on the voltage waveform for a set period of time, i.e. 1-cycle (20ms) or 2-cycle (40ms). I am also wondering if such device can be bought off the shelf?

    I hope that makes sense.

    Thanks again everyone.
    Peter

    Edit:
    Added a waveform of the point on wave that I am describing.
     
    Last edited: Sep 24, 2009
  4. blueroomelectronics

    AAC Fanatic!

    Jul 22, 2007
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    What is the device it's going to trigger?
     
  5. topopo

    Thread Starter New Member

    Sep 23, 2009
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    Hello blueroomelectronics,

    The device I am going to trigger is a contactor, i.e latching the contactor ON. The contactor is basically switching a high current load (100-500A) at 45° of the voltage waveform for 20 - 40ms.

    Please refer to the diagram I have attached in my previous post.

    Thanks,
    Pete
     
  6. blueroomelectronics

    AAC Fanatic!

    Jul 22, 2007
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    Do you have a datasheet on the contactor?
     
  7. topopo

    Thread Starter New Member

    Sep 23, 2009
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  8. CDRIVE

    Senior Member

    Jul 1, 2008
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    Have you considered the pull-in time of the contactor? They're not that fast you know. I couldn't find that spec in your data sheet but I wouldn't be surprised that > 5 cycles @ 60Hz would pass before the contacts closed, and this doesn't include contact bounce!
     
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