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Anyone can help me

Discussion in 'Electronic Basics' started by Daniel, Oct 28, 2005.

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  1. Daniel

    Daniel Guest

    Anyone can help me, im new do things with electronics
    I have a light modulate kit built with THYRISTOR´s and wen I try using
    light with transformer (normal spots of 30W) they don't work, only
    the normal lamp work.
    I hear if I use triac, they can work with the lamps with transformer.
    Can I simple make the change from thyristors to triac´s
    Wish triac´s I can use?
    Thanks in advance
    Daniel
     
  2. Blake

    Blake Guest

    Daniel,

    A triac is a thyristor.

    It's not obvious to me why your light modulator (dimmer?) doesn't work with
    transformer driven lamps. I use light dimmers with transformer operated
    battery chargers and incandescant lamps from time to time. They have always
    worked for me.

    But there is a concern. Power transformers are made to work with sine wave
    frequencies of 50/60 hz. After chopping the waveform with a triac, there is
    a considerable amount of power in high frequency harmonics. The transformer
    will be much less efficient at these high frequencies, and a good share of
    your input power goes into heating up the transformer.

    The saving grace is that while the efficiency goes down for low duty cycle
    settings, the input power is less. Total heating of the transformer doesn't
    usually increase. Of course, it depends on many factors, so don't take this
    as an absolute rule.
     
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